Building Services Assignment

hello! I am one of the member of group H for the building services assignment. We have 5 members per group. In this website, we will share our knowledge which is related to building services. We are currently working for it at the moment, so we will try our very best to keep updating very soon. As I mentioned earlier, our group create this website not just for fun. It is actually for educational purpose. That’s all for me. Thank you.

-Hajar

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Lightning Protection System

Lightning

  • Lightning is a dazzling bluish white light produce by clouds. It usually accompanied by thunder.
  • Lightning is a gigantic electrical spark travelling between cloud to cloud to earth containing an average charge of 30 to 50 lakhs volts and a current of 30 kilo amperes with a speed of 220 km per hour.
  • When the clouds fill up with electric charges, the positive charges or proton from the top of the cloud and negative charges from at the bottom, it causes lightning.

Theories of occurring lightning

  • Polarization Mechanism Theory

As ice falls through the Earth’s atmosphere, they become electrically polarized.

  • Electrostatic Induction Theory

Two opposing charges get separated. The electricity gets stored in the middle of a cumulonimbus cloud. There the electricity collides with rain.

  • The Discharge Theory

Electricity is made when there’s enough positive and negative energy together.

thunderhead

 

Types of Lightning Protection Systems LPS

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Lightning protection systems for buildings and installations may be divided into three principal types as follows:

  1. LPS for Protection for buildings and installations against direct strike by lightning,
  2. LPS for Protection against overvoltage on incoming conductors and conductor systems,
  3. LPS for Protection against the electromagnetic pulse of the lightning.
First: LPS for Protection for buildings and installations against direct strike by lightning

This type of LPS protects the building from damage by direct strike lightning but doesn’t prevent the lightning striking the building.

This type of LPS can be divided into:-

  1. Conventional lightning protection system,
  2. Non-Conventional lightning protection system.
 1- Types of Conventional Lightning Protection System

The Conventional Lightning Protection System includes (2) different types as follows:

  • Franklin Rod LPS,
  • Franklin/Faraday Cage LPS.
2- Types of Non-Conventional Lightning Protection System

The Conventional Lightning Protection System includes (2) different types as follows:

1- Active Attraction LPS, which includes:

  • Improved single mast system (Blunt Ended Rods),
  •  Early streamer Emission System.

2- Active Prevention/Elimination LPS, which includes:

  • Charge Transfer System (CTS),
  • Dissipation Array System (DAS).
Notes on different Types of Lightning Protection Systems LPS

Each system’s design requires the following:

  • The air terminal or strike termination device must be positioned so that it is the highest point on the structure.
  • The lightning protection system must be solidly and permanently grounded. Poor or high resistance connections to ground are the leading cause of lightning system failure for each one of these systems.
  • None of these systems claims to protect against 100% of the possibility of a lightning stroke arriving near protective area. A compromise must be made between protection and economics.

Mechanism of lightning occurrence

In most cases the mechanism for occurrence of thunder clouds is rising air currents due to the air being heated near the ground by strong sunlight. The air in this rising air current is cooled, and the charge is separated when hail is generated, so the thunder clouds grow large due to the effect of electricity being generated.

Normally, a positive charge accumulates in the top of a thunder cloud and a negative charge accumulates in the bottom, so positively charged static electricity is induced near the ground surface. In this way, a strong electric field is generated between the thunder cloud and the earth, and when this exceeds the insulation capacity of the air, lightning is generated.

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Lightning generation mechanism

 

Effects Of Lightning Strike:

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The effects of lightning are those of a high-strength impulse current that propagates initially in a gaseous environment (the atmosphere), and then in a solid, more or less conductive medium (the ground):

  • visual effects (flash)
  • acoustic effects
  • thermal effect
  • electrodynamics effects
  • electrochemical effects
  • effects on a living being (human or animal)

Lightning causes two major types of accidents:

  • accidents caused by a direct stroke when the lightning strikes a building or a specific zone. This can cause considerable damage, usually by fire. In order to prevent any risk of accident, lightning air terminals should be used.
  • accidents caused indirectly, as when the lightning strikes or causes power surges in power cables or transmission links. Hence the need to protect with Surge Protection Devices the equipment at risk against the surge voltage and indirect currents generated.

Direct effects

  • Thermal effects: These effects are linked to the amount of charge associated with lightning strikes. They result in fusion points melting holes of varying sizes at the point of impact of materials with high resistivity. For material which is a poor conductor, a large amount of energy is released in the form of heat. The heating of water vapour contained in the material results in very high abrupt localized pressure which may cause it to explode.
  • Effects due to the initiation: In the event of a lightning strike a substantial increase in the ground potential of the installation will occur depending on the grounding network and soil resistivity. Potential differences will also be created between various metal elements. Hence the need to pay particular attention when installing earth rods and inter-connection of metal structures adjoining the conductors.
  • Acoustic effects – thunder: Thunder is due to the sudden increase in pressure (2 to 3 atmospheres) of the discharge channel developed by the electrodynamic forces during the lightning flash. The duration of a thunder clap depends on the length of the ionized channel. For high frequencies, propagation of the spectral components released by the shock wave is perpendicular to the channel. For low frequencies, propagation is omnidirectional; hence the different forms of rumbling or claps heard by an observer according to the distance and orientation of the successive channels used by the lightning flash.
  • Luminous effects: A lightning strike nearby violently sensitizes the retina of an observer. The eye is dazzled and vision is lost for several long seconds.
  • Electrodynamic effects: Electrodynamic effects between conductors and other parts occur due to large magnetic field of the lightning current. This results in substantial mechanical forces, both attractive and repulsive, that are all the stronger when the conductors are close together or the current is high. Lightning Phenomenon, Effects and Protection Of Structures From Lightning
  • Electrochemical effects: The fleeting nature of lightning impacts (compared to stray ground currents) mean that these effects are highly negligible and without influence on earth rods.

 

Indirect Effects

The ever increasing use of sensitive electronics means that electrical equipment is becoming more and more vulnerable to transient overvoltages caused by lightning.The overvoltages are either of atmospheric origin or industrial origin. The most harmful are however atmospheric overvoltages which are the result of three main effects:

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Conduction: An overvoltage that propagates along a conductor which has been in direct contact with the lightning strike. This effect is all the more destructive as the majority of the lightning energy is propagated through the entire network. This problem is resolved by fitting the installation with suitable device able to support high currents.

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Induction: caused by the electromagnetic field radiated by the lightning strike. It generates an overvoltage on conductors within a range that is proportional to the power and the rate of speed variation of the lightning strike. Consequently, under the influence of abrupt variations in current, the cables, and even the ducts which act as aerials, may be subjected to destructive overvoltages. This is the reason that placing the network underground does not guarantee lightning protection.

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Rising up from the ground: When a lightning strike hits, an overvoltage can rise up from the ground attempting to find a more favourable path to ground. This can, in part, be dealt with through a) equipotential bonding between the metal structures and ground of the entire installation of a structure. b) overvoltage protection installed on services.

 

LIGHTNING PROTECTION SYSTEM (LPS)

  • Elements of LPS

The elements of lightning protection system are as below:

  1. a network of roof-top air terminals
  2. a network of ground terminations
  3. a network of conductors interconnecting the air terminals and grounds
  4. interconnections with metallic bodies
  5. surge suppression devices on all incoming power and communication lines

These elements are important, and it is an essential to a proper system of lightning protection system performance. Every function of these element is differently, which is as the first three elements above to intercept, conduct and dissipate the main lightning discharge. Meanwhile, the fourth element addresses the secondary effects of a lightning strike by limiting the dangers of the harmful current jumping or side flashing within a structure. Thus, the last element protects power lines and connected equipment from damaging currents traveling on utility lines. Failure to make proper provisions for any of these five elements can result in inadequate protection.

  • LPS Components, Fitting, and Accessoriesl 7

LPS components, fitting, and accessories are divided into 3 different main components which is important to complete lightning protection system.

  • Rod or ‘Air Terminals’
  1. The small, vertical protrusions designed to act as the ‘terminal’ for a lightning discharge.
  2. Rods can be found in different shapes, sizes and designs.
  3. Most of rods are topped with a tall, pointed needle or a smooth, polished sphere.
  4. The functionality of diverse types of lightning rods, and even the necessity of rods altogether, are subjects of many scientific debates
  • Conductor Cables
  1. Heavy cables (right) that carry lightning current from the rods to the ground.
  2. Cables are run along the tops and around the edges of roofs, then down one or more corners of a building to the ground rod.
  • Ground Rods
  1. Long, thick, heavy rods buried deep into the earth around a protected structure.
  2. The conductor cables are connected to these rods to complete a safe path for a lightning discharge around a structure.

Method of LPS Installation

Lightning protection system are important to be install. However, it is should be design and be approved as a LPS before the installation of it is start. Below shown the step of chart on the process to design a LPS.

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After it is approved, the method of LPS installation will be make on the building. As below, it is the method of installation of lightning rods installation which is important to performed by technically qualified personnel and under the current regulations.

  1. The top of the light terminal shall be installed at least 2 meters over the area that it protects (including antennas, refrigerating towers, roofs and tanks)
  2. Each lightning rod shall be connected to at least two down conductors.
  3. The receiving antennas (TV, radio, telephone) should be connected directly or through and SPD or an isolated spark gap to the lightning protection system with a suitable conductor.
  4. The coaxial cable of the antennas should be protected with a surge protective devices.
  5. The metallic elements that rise above the roof should be connected to the closest down conductor.
  6. The routing of the down-conductor should be as straight as possible, following the shortest path, avoiding sharp bends or upward sections.
  7. The bend radii should not be less than 20cm.
  8. Down-conductors will be placed preferably at the external part of the structure (whenever possible), avoiding the proximity of electrical or gas conductors.
  9. The grounding system should be placed in a registry cage to do periodical inspections.
  10. The registry cage (or, in its absence each down-conductor) should be provided with a test joint to disconnect the earth termination system for enabling measurements.
  11. The resistance value measured using a conventional equipment should be the lowest possible (less than 10 Ω).
  12. This resistance should be measured on the earthing termination insulated from any other conductive component.
  13. All earthing system for a same structure should be interconnected.
  14. It is recommended to add Quibacsol mineral compound to achieve lower soil resistivity.

 

GAS SUPPLY SYSTEM

 

GAS PROPERTIES

  • There are basically two types of gas:
  1. Natural gases(most common gasses)
  2. Artificial gases

GAS1

  • The natural gasses are present in nature spontaneously. These include common gasses which are easily available through the air. While the artificial gasses are obtained by a man from some chemical reactions.
  • The natural gases are again of two types as:
  1. Elemental gases

These are the gasses formed along with matter on earth and other planets. These gasses are made of single element atoms. Examples of gasses include; Hydrogen (H2), oxygen (O2), nitrogen (N2), noble gasses are the gasses in the atmosphere. While Chlorine (Cl2), fluorine (F2) are present in combination substances.

  1. Compound gases

These are also gasses formed in nature out of biological processes. Chemically, these are combinations of two or more elements. They are formed by the combination of carbon, oxygen, nitrogen, hydrogen, nitrogen. Example; carbon-dioxide (CO2), methane (CH4), sulphur dioxide (SO2), ammonia (NH3), etc.

 

  • These gasses are present even before life existed on earth. So, they are not harmful to nature if their concentration in the air ratio’s is not disturbed a lot.
  • The artificial gasesare those which are synthesized by chemical reactions. They are made of many elements besides those listed above.
  • These artificial gasses include chlorofluorocarbons, anaesthetics, sterilizing agents, etc.
  • These are meant for special needs of man but are not useful to nature. In turn, some of them are harmful to nature.

 

Example: Chlorofluorocarbons used in refrigerators cause harm to the ozone layer. This ozone layer is a layer used to protects us from the harmful UV rays of the sun rays from reaching the ground. Hence their use in refrigerators is discontinued.

 

  • Also, there are acidic gases(Example: Hydrochloric acid (HCl) and Hydrofluoric acid (HF)) Since they are volatile, they are used as a mixture of water. They have very low pH like.
  • Basic gases have pH more than 7. (Example: Ammonia (NH3)
  • Green House gases is a gas which is enhance the earth’s temperature. These gases include carbon dioxide, methane nitrous oxide etc. They lead to greenhouse effect where in the surface of earth is kept warm. If the concentration of these gases increases, it can lead to global warming.

CHARACTERISTICS OF GAS

  • Gases are highly compressible

An external force compresses the gas sample and decreases its volume, removing the external force allows the gas volume to increase.

  • Gases are thermally expandable

When a gas sample is heated, its volume increases, and when it is cooled its volume decreases.

  • Gases have low viscosity

Gases flow much easier than liquids or solids.

  • Most Gases have low densities

Gas densities are on the order of grams per litter whereas liquids and solids are grams per cubic cm, 1000 times greater.

  • Gases are infinitely miscible

Gases mix in any proportion such as in air, a mixture of many gases.

GAS LAWS

  • Divided into two different law, which is:
  1. Boyle’s law
  2. Charles’ law
  • These different laws are shown the different reaction of gas supply system which is relate to it pressure and temperature.

GAS2

  • Based on the Boyle’s law, the increase of pressure can cause a gas to contract. Meanwhile, when the decrease of pressure can cause a gas to expand. It is shown as image above.

GAS3

  • For the Charles’ law, the gas is reacting to the temperature. When the temperature surround is increase, the gas will be expanding and its contrast, which is when the temperature decrease, the gas will be contract.

COMPONENTS OF GAS SUPPLY SYSTEM AND ITS FUNCTIONS

  • Pressure Regulator

GAS4

Pressure regulators is the valves that automatically cut off the flow of a gas or liquid when it is at a certain pressure. To reduce to a usable and safe pressure for different applications regulators are also used to allow high-pressure fluid supply tanks or lines. The function is to match the flow of gas through the regulator to the demand for gas placed upon it, whilst maintaining a constant output pressure. the regulator flow must decrease too when the load flow decreases. If the load flow increases, the regulator flow must increase it is used to keep the controlled pressure from decreasing due to a shortage of gas in the pressure system.

 

  • Ball Valve

GAS5

Ball valves are a species of plug valves having a ball-shaped closure member. It is designed to restrict and control flow which have a ball inside the valve. A ball valve is a form of quarter-turn valve which uses a hollow, perforated and pivoting ball to control flow of gas through it. When the valve handle pivoted 90 degrees it will close, and the gas will flow when the ball’s hole is in line.

  • Gas pressure meter (Pressure gauge)

GAS6

Pressure control panels are complete with pressure gauges for indication of the cylinder and outlet pressure. The pressure control panels can be supplied with contact pressure gauges which give a signal if the cylinder pressure drops below a certain set level. This signal can be passed to low pressure alarm panel. Pressure gauge is an indicator to grading and checking the volume of gases in the piping that flow out from the gas cylinders.

  • Gas cylinder

GAS7

Gas cylinders should always be located outside of working places which is usually located in the gas store room at the lower ground floor. This is achieved by a central gas distribution system consisting of pressure control panels, pipelines and tapping points at the various points of use.

  • Lab gas tap

GAS8

Lab gas tap is a ball valve supply gas to the end user from the gas storeroom to the end user. Located at laboratory. Colour indicates the type of gases.

  • Gas piping

GAS9

A plumbing system that includes gas pipes and other gas plumbing components that connect as style fixtures or any other appliances with the gas line is called gas supply system. The function of gas piping is to carriage and delivery of gas, to the gas consuming fixtures or appliances.

PIPES SYSTEM INSTALLATION

  1. The piping system must be designed so that the gas meter provided by gas supplier can be properly located for or within the building of the owner or each customer
  2. Gas pipes should be located such that the locations of isolation valves are easily accessible to the users to facilitate line isolation during emergency. Each floor or section of a building should be provided with an isolation point, in case of fire or leakage at any of the sections.
  3. Gas pipes should as far as practicable, be run outside the building
  4. Gas pipes should preferably enter the building aboveground and remain aboveground and in ventilated location
  5. Gas pipes should be properly painted and labelled for identification purposes. The colour for gas pipes should be yellow
  6. The pipe route selection should avoid any positions where the pipe could be liable to damage either during the building construction or when the property is finally occupied.
  7. The fire resistance of the building must not be impaired
  8. The route should as far as possible avoid the need to cut into load bearing walls or joist.
  9. Pipes may be concealed but provision should be made for access. Exposed gas pipes would facilitate leak detection and maintenance.
  10. Pipe riser ducts must have 2-hour fire rated doors and have one side as an external wall with fixed louvers or ventilated pre-cast block venting naturally to atmosphere.
  11. There should be a space of at least 50mm between a gas pipe and any other services. Where electrical services are being use in the same duct, the gas riser should be separated from the electrical services by a gas tight partition.
  12. Pipes passing through a cavity must take the shortest route and be sleeved.
  13. Pipes are normally run above ceiling, dropping down to appliances on the floor below it when no other route is available.
  14. Pipes must not be laid under or through foundations.
  15. Pipes should never run diagonally across walls or floor. They should normally follow the line of the walls and be kept close to them.
  16. The piping system must not be exposed to the excessive external stress, vibration or corrosion.
  17. The piping system must be installed at a location where maintenance and checking work can be done easily.
  18. To prevent the distribution of gas leakage throughout the building, piping inside any building must not be installed at the following locations:
  • Lift shaft
  • Flues, chimneys and gas vents
  • Clothes chute
  • Enclosed staircase
  • Air handling room
  • Unventilated void space
  • Under load bearing foundations and walls
  • In rooms provided with high voltage power facilities
  1. All piping outlets should be installed to provide sufficient clearance from ceilings, walls and floors to use permit use of a pipe wrench of a suitable size without straining or bending the pipe. The outlet fitting, or piping should not be placed behind doors.

GAS10

  1. Each outlet, including pipe terminating with a valve, should be securely closed gas-tight with an approved threaded plug or threaded cap immediately after installation and should be left closed until an appliance is connected.

TYPES OF GAS SUPPLY SYSTEM

  • Gas supply system are as below:
  1. Natural gas system

Gas flowing from higher to lower pressure is the fundamental principle of the natural gas delivery system.  The amount of pressure in a pipeline is measured in pounds per square inch. From the well, the natural gas goes into “gathering” lines, which are like branches on a tree, getting larger as they get closer to the central collection point.

GAS11

First, PGU which stand for Peninsular Gas Utilisation and known as natural gas transmission pipeline will send the natural gas to city gate and later to odorize station. Then, natural gas has transmitted to district station through Fender Line (262 psig). After that the gas are transmit are divide and transmit to regulating station and area station through distribution line (60 psig). Regulating station will send the gas to shopping complexes or multiple end-users through internal piping (4.3 psig) and area station will send the gas to residential through internal piping (0.43 psig).

GAS12

2. LPG supply system

GAS13

GAS14

First, LPG Cylinder Manifold or bulk tank (70psi-100 psi) supply gas through internal piping to first stage regulator. 5 psi of gas is distributed to commercial and 5psi is distributed to second stage regulator before supply to residential. 0.5 psi of gas are supply to residential.

 

 

 

ELECTRICAL SYSTEM

 

Introduction to power generation

Power generation has become the heart of all those that gave us convenience in our daily living. On the other hand, it also ignited the dramatic increase in the human’s need for energy which started way back during the so-called industrial revolution. Generation is a large amount of electricity production process for general use. Typically, the energy produced at 10-20kV voltage to reduce the cost of insulation while generating electricity is an instrument used to convert mechanical energy into electrical energy. The fundamentals of energy conversion are energy that cannot be created or destroyed but can be converted from one form to another.

Take for example:

  • Light energy – Heat energy
  • Potential energy – Mechanical energy
  • Mechanical energy – Electrical energy

The electric current generated at the power station is the alternating current when a wire or an electrical energy conductive material cuts off a magnetic power line, the electrical current will produce. This principle is used in the operation of electric power sponsorship at power station. Electric current generated in this way is called induction currents

Methods of distribution

Where Do Our Electrical Energy and Power Are Coming From?

An electric power distribution system is the final stage in the delivery of electric power. It carries electricity from the transmission system to individual consumers. The distribution substations connect to the transmission system and lower the transmission voltage to medium voltage ranging between 2kV and 35kV with the use of transformers.

 

Primary distribution lines carry this medium voltage to distribution transformers located near the customer’s premises. Distribution transformers again lower the voltage to the utilization voltage of household appliances and typically feed several customers through secondary distribution lines at this voltage. For the commercial and residential customers are connected to the secondary distribution through service drops. Customers demanding a much larger amount of power may be connected directly to the primary distribution level or the sub-transmission level. A ground connection to local earth is normally provided for the customer’s system as well as for the equipment owned by the utility.

 

Principles of Electricity

Electrons – negatively charged particles that revolve around the nucleus of the atom.

Protons – Positively charged particles that revolve around the nucleus of the atom.

Neutrons – No charge in the atom.

  • These parts are important to know because they determine the charge of the atom.
  • The charge of the atom creates the energy used as electricity.

 

Consists of 4 Parts

  • Source
  • Produces the force that causes electrons to move.
  • Think of a water source that pushes water through a pipe. Same principle.
  • Electrons (-) are attracted by positive charges, and repelled by negative charges. (Opposite charges attract each other.)

 

  • Conductors
  • Provide an easy path for electrons to move throughout the circuit.
  • Copper is the most commonly used conductor in electronics and residential wiring.
  • Other conductors include other metals, and water.

 

  • Load
  • Part of the circuit that changes the energy of the moving electrons into another form of useful energy.
  • Think of a light bulb as a load.
  • As electrons move though the filament of the lamp, the energy of electrons in motion is changed into heat and light energy.

 

  • Control Device
  • Opens or closes the circuit for electrons to flow.
  • A light switch is a great example. The lights are off, electrons can’t flow through to complete the circuit because the switch is open. When the switch is closed, the electrons can flow, and the circuit is closed.
  • Switches can be classified as NO (normally open) or NC (Normally closed)

 

 

 

Voltage

  • The force that moves electrons is call VOLTAGE.
  • The unit to measure voltage is known as volts.
  • The common voltage a residential circuit is 120 volts.
  • When calculating formulas, voltage is labelled as “V”.

 

Current

  • Current – Movement of electrons.
  • Current is measured in Amperes or amps.
  • A typical residential circuit measures 15 Amps.
  • The specifications for a common residential circuit are 120V/15A
  • When calculating formulas, current is labelled as “I”.

 

Resistance

  • The opposing force in electrical current.
  • When electrons flow through a conductor, they are opposed by an insulator. The insulator provides resistance.
  • Coating on a wire is the insulator.
  • Unit of resistance is the OHM.

Scientists usually draw electric circuits using symbols:

 

 

Type of circuit

Series Circuit

  • A circuit in which the same current flows through all components of the circuit.
  • The current only has one path to take.
  • If the lights are constructed in a series circuit (as many are), if just one bulb is missing or burnt out, the current cannot flow and the lights won’t turn on.
  • Series circuits can be very frustrating because if they don’t work, you have to figure out which piece is responsible.

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Parallel Circuit

  • is a circuit in which the components are arranged so that the current must break up (with bits flowing across each parallel branch) before meeting and combining again.
  • Because the current divides, each component is assured a charge.
  • And if one path breaks, the other paths will still work because they aren’t reliant on each other.
  • Example: If you’re looking for new Christmas lights, check that they’re in a parallel circuit arrangement if you want to avoid a lot of hassle.
  • Houses are always built with parallel circuits so that if one light burns out, your entire house won’t lose power.

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Combination Circuit

  • This circuit is a combination of the series and parallel circuits.
  • Some sections of the circuit are series and others are parallel.

Ohm’s law (George law):

  • Contain 3 main things that present in all the operational circuits and all of them is having a a relationship. The 3 main things are:
  1. Voltage
  2. Current
  3. Resistance
  • The reaction between this can be seen when the voltage is increase, so thus the current will increase in direct proportion. As example below:

When the voltage increases from 6 volts to 9 volts, the current will automatically increase in direct proportion.

  • However, the reaction of resistance with the current is in opposite direction. It is because when the resistance is increase, the current flow will be decrease in direct proportion as an example below:

when the voltage is remaining at the same volt which is 12 volts, but the resistance is increase from 3Ω to 6Ω. We can see the lighting is getting dim that is means the current flow is decrease in direct proportion.

  • Ohm’s law can be calculating by using this formula:
  • V = IR
  •  I = V/R
  •  R = V/R

dcp3

**NOTED:

IF ANY TWO VALUES IN CIRCUIT ARE KNOWN, THE THIRD VALUES CAN BE CALCULATED

 

Type of phases

Single phase

BS9

·         Used in most homes and small businesses

·         Able to supply ample power for most smaller customers, including homes and small, non-industrial businesses

·         Adequate for running motors up to about 5 horsepower; a single phase motor draws significantly more current than the equivalent 3-phase motor, making 3-phase power a more efficient choice for industrial applications

·         Is the distribution of alternating current electric power using a system in which all the voltages of the supply vary in unison.

·          Single-phase distribution is used when loads are mostly lighting and heating, with few large electric motors.

·          A single-phase supply connected to an alternating current electric motor does not produce a revolving magnetic field; single-phase motors need additional circuits for starting, and such motors are uncommon above 10 kW in rating.

BS10

Three phase system

·         Common in large businesses, as well as industry and manufacturing around the globe

·         Increasingly popular in power-hungry, high-density data centers

·          Expensive to convert from an existing single phase installation, but 3-phase allows for smaller, less expensive wiring and lower voltages, making it safer and less expensive to run
·         Highly efficient for equipment designed to run on 3-phase

·         Common method of alternating current electric power generation, transmission, and distribution.

·          It is a type of polyphase system and is the most common method used by electrical grids worldwide to transfer power.

·         It is also used to power large motors and other heavy loads.

BS11

To illustrate the difference between single phase and three phase, imagine a lone paddler in a canoe. He can only move himself forward while his paddle moves through the water. When he lifts the paddle out of the water to prepare for the next stroke, the power supplied to the canoe is zero.

Now picture the same canoe with three paddlers. If their strokes are synchronized so each is separated by 1/3 of a stroke cycle, the canoe receives constant and consistent propulsion across the water. More power is supplied and the canoe moves across the water more smoothly and efficiently.

 

 

REFUSE DISPOSAL SYSTEM

WHAT IS DOMESTIC WASTE?
Domestic waste is the waste produced in course of a domestic activity. In other word, waste that is generated because of the ordinary day-to-day consumption of households. The waste usually produced from accommodation used purely for living purposes and without commercial gain, and which is disposed of via the normal mixed domestic refuse collection. Example of domestic waste are vegetable waste, kitchen waste and household waste. It is also known as municipal solid waste that are commonly called trash, debris, garbage and refuse or rubbish waste which is a type of waste that produce every day in terms of items or element that are discarded by the public. Output of daily waste depends on dietary habits, lifestyle, living standards and degree of urbanization and industrialization.
INDUSTRIAL AND COMMERCIAL WASTE
• Commercial and industrial (C&I) waste is controlled waste arising from the business sector.
• Industrial waste is waste generated by factories and industrial plants.
• Commercial waste is waste arising from the activities of wholesalers, catering establishments, shops and offices.
• Type of commercial waste include:
✓ Municipal waste such as paper, glass, food stuffs, and general waste.
✓ Hazardous waste including materials produced by health clinics, construction and the disposal of components such as fluorescent lighting and some parts of electrical equipment such as fridges and freezers.
• For industrial waste. over 10% is reused and over 33% is recycled (compared with 13% for municipal waste).
• For commercial waste, there are 1.6% reused and 22% recycled.
DISPOSING OF INDUSTRIAL AND COMMERCIAL WASTE
• All businesses have a duty of care under the Environmental Protection Act 1990 to dispose of their waste properly and sustainably.
• This includes having a clear audit trail of how that waste is stored and where it is subsequently sent.
• The emphasis is on preventing waste from being created first and then reusing, repurposing or recycling before settling on the final option of disposing by incineration or putting into landfill.

WASTE HIERARCHY
The important part to manage the commercial and industry waste is 5 stage hierarchy:
1. Prevention: The key for industrial and commercial sectors is to ensure that they prevent the production of waste as much as possible in the first place. This will mean different things for different industries. Another option for businesses is to introduce new technology to reduce waste such as greenhouse gas emissions.
2. Preparing for Re-use: There are plenty of ways for businesses and industries to prepare their unwanted waste for reuse. This could be something as simple as using both sides of copying paper or cleaning and repairing old equipment for reuse either within the company. In bigger industries it could mean using quarry waste for road building rather than sending to landfill as was previously the case.
3. Recycling: Most businesses and industries nowadays separate out their waste to be recycled. This can include paper, card, plastic and metal, all of which can be repurposed in some way. Paper for example can be pulped and made into recycled paper. Glass can be melted down to make new bottles and containers.
4. Other Recovery: Where recycling is not possible, other methods such as heat and energy recovery can be used. This is particularly used in industries such as agriculture where large amounts of farm waste can be used in anaerobic digestion to provide fertilizer and heat or electricity. Many councils nowadays use this as the last stage of waste disposal and more and more cities and towns are beginning to see incineration plants that also provide valuable energy to the surrounding population.
5. Disposal: The final stage of the hierarchy is disposal to landfill or straight incineration. For highly hazardous materials, specialist landfill sites are needed, and disposal services must be specially licensed to use them

REQUIREMENT FOR DISPOSAL SYSTEM OF HIGH RISE BUILDING
Chute system in high rise building

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Refuse chutes in high-rise flats it is not practical or hygienic to carry dustbins or bags down to the ground floor for subsequent collection. A method of overcoming this problem is to provide a refuse chute carried vertically through the building, with an inlet hopper on each floor. The hoppers must be designed to close the chute when they are opened to receive refuse, or otherwise people on the lower floors might be covered with refuse from above when they put their own refuse into the hopper. This type of hopper also prevents dust, smoke and smells from passing through to the floors.
Planning
There may be more than one chute in a building and these discharge into a refuse container, or an incinerator, inside specially constructed chambers. Refuse chutes should be sited on well-ventilated landings, balconies or adjacent to the kitchens and storage spaces. It should not be sited in a kitchen. For sound insulation, any wall separating a refuse chute away from a habitable room Washing down facilities may be provided for the chute by means of a dry riser with jet heads fitted inside the chute at each floor level. Some authorities, “However, hold that bacteria breed more readily in the presence of water and therefore washing down of chutes should be avoided. Users should be advised to wrap the refuse to prevent soiling of the chute. A chute can be arranged to discharge into two bins” by bifurcating the end with a cut-off damper, operated by a caretaker when one is filled. A special machine may also be used, which automatically compresses the refuse into the bags. Ventilation The chute should be ventilated by means of pipe. The ventilator should be of non- combustible material.
Materials
Refuse chutes should be of non-combustible and acid-resistant materials. Glazed stoneware, spun concrete or asbestos cement pipes may be used. Hoppers should also be made of non-combustible materials not subject to corrosion or abrasion. Hoppers are manufactured from cast iron, wrought and cast aluminum and steel. Steel hoppers are galvanized, and cast-iron hoppers painted.
TYPES OF SYSTEM

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DISPOSAL SYSTEM TECHNIQUES

1) Garbage Disposal Installation

Having a home garbage disposal reduces landfill waste by pulverizing food waste and washing it down the drain. The food waste does not become liquid, but it is altered enough not to ruin sewer pipes. A garbage disposal is a step in the right direction, but it solves less than half of the problem. Plenty of waste gets thrown away even with a disposal. Not only that, but the material that can be put down a garbage disposal would be better used in a compost pile.

2) Composting

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Taking all your organic food scraps, including coffee grounds and egg shells (excluding meat, bones, skin and lard) and throwing it in layers on a compost pile eventually breaks it down and becomes nutrient-rich fertilizer. You must keep the amounts in proportion and add grass clippings and other yard debris as well, but when done right you are helping to complete the cycle of life. This is one of the best ways to dispose of (food) waste.

3) Recycling

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Instead of simply throwing everything away in trash, get in the habit of recycling what can be reused or remade. Metal, paper products, certain plastics, motor oil, electronics, appliances, mattresses, wood, rubber, glass and other things can all be recycled. In some cases, you must pay to have it hauled away. Other things people will gladly remove from your recycling pile on the street. If everything that could be recycled was recycled across the board, the aggregate trash amount would be drastically reduced very year.

4) Incineration

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While this method is mainly used at the industrial level, residential incinerators are available to dispose of waste. There is the danger of releasing toxins from certain materials, though, so be sure you know the potential hazards. Rather than throwing everything away to go to the landfill, take the time to consider other waste disposal methods. In doing so, you’ll cut down on the amount of trash you make, and with composting you may end up with something usable because of it.

5) Landfills

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Throwing daily waste/garbage in the landfills is the most popularly used method of waste disposal used today. This process of waste disposal focuses attention on burying the waste in the land. Landfills are commonly found in developing countries. There is a process used that eliminates the odors and dangers of waste before it is placed into the ground. While it is true this is the most popular form of waste disposal, it is certainly far from the only procedure and one that may also bring with it an assortment of space. This method is becoming less these days although, thanks to the lack of space available and the strong presence of methane and other landfill gases, both of which can cause numerous contamination problems. Landfills give rise to air and water pollution which severely affects the environment and can prove fatal to the lives of humans and animals. Many areas are reconsidering the use of landfills.

SANITARY SYSTEM

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Our case building, G11,Kolej Rahman Putra

 

PRINCIPLE AND DESIGN OF THE SOIL PIPE AND WASTE PIPE IN OUR BUILDING CASE

SOIL PIPE

  • A pipe which conveys soil water either alone or together with waste water or rainwater or both
  • Soil water is used water contaminated with solid waste or trade effluent
  • Soil fitment is those which are used to remove soil water and human excrete.
  • A soil pipe is a PVC or cast iron pipe used in plumbing installations to remove soiled contaminated water from toilets.
  • Generally, the diameter of soil pipe is larger and are designed specifically to remove solid waste from toilets
  • Soil pipe substantially larger than a regular waste water pipe. Average inside diameter around 10cm.

 

WASTE PIPE

  • A pipe which convey waste water alone or with rainwater. (no soil water and solid waste)
  • Waste water is used water not contaminated by soil water and trade affluent.
  • Waste water fitments is those which are used to remove waste water from washing and preparation of food.
  • Modern waste pipes are fitted with 2 screw caps. Both type of cap should be unscrewed carefully, exerting only minimum amount of pressureBS4DIFFERENCE BETWEEN SOIL PIPE AND WASTE PIPE
    WASTE PIPE DIFFERENCE SOIL PIPE
    Designed to only have liquids from kitchen, basins, drink fountains and tundishes. PLACE TO INSTALL Used for toilets, urinals, bidets and sluice sinks
    Waste Vents TYPE OF VENT Soil Vents

     Types of sanitary system

    There are a few types of sanitary system that used in a house or building for collecting or conveying a waste water. This sanitary system will collect all wasting water straight to the public sewer or domestic septic tank. As below, it is the types of sanitary system:

    a)one pipe systemBS5

    As image above, one pipe system is a system that collect all soil and waste water into one common pipes. All the branch ventilating pipes will connect to the one main ventilating pipe. This one pipe system is usually used by multi storey building. It is because, this pipe will replace the two-pipe system.

     

     

    b)two pipe systemBS6

     

  • Two pipe systems are a system that having a waste stank that received the discharge of fitments and conveyed to the ground level. This pipe is having to delivered it above of the water seal in a trapped gully that is connected to the drainage system. Meanwhile, for the soil stack, it will have received the discharge of soil appliances and will directly brought it to the underground drainage system. This system is can be seen in the image above.c)single stack systemBS7.pngThe single stack system is a very economical system in sanitary system. It is because it can be reducing the cost of soil and waste systems. This type also does not need a branch vent pipes.

     

    d)Modified single stack systemBS8

  •  Modified single stack system is a close grouping of the sanitary appliances. It is mean that the installation of the branch waste and soil pipes will not be need by the individual branch of ventilating pipes.e)The fully ventilated one pipe systemBS9
  • This type of sanitary system is a many sanitary appliance in ranges. It is because all the trap will have an anti-siphon or the vent pipe each. At this point, the vent stack will be connected to the discharge stack near to the bend to remove compressed air.

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Method of Installation

As mention above, sanitary system is divided into three types which is One Pipe System, Two Pipe System and Single Stack System. Different types of system have their own method of installation. Based on our case building which is Block G11 at Kolej Rahman Putra UTM are using One Pipe System. Basically, One Pipe System are preferred for this kind of building where it is suitable to group all the soil and waste appliances and take all types of waters to a common sewer then to the place where water treatment or disposal located.

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Since it is called One Pipe System, use only one pipe in collecting and draining discharge and usually all sanitary fittings are connected to one pipe only. So that means, all sanitary fitting being installed near to a main pipe that will easier to being connected to the branching pipe.

In this system, a separate vent pipe is provided and the traps of all water closets and basins are completely ventilated. The single stack vent pipes release compressed air that may have trapped at the base of waste and disposal water single stack pipe. The vent branching pipe connects the single stack vent pipe to the sanitary fitting.

Since this system is provided in multi-storeyed building, the lavatory blocks of various floors are so placed one over other. So that the waste water discharged from the different units can be carried through short branch drains to common soil and waste pipe.

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DOMESTIC WATER SUPPLY

Domestic water supply also known as drinking water supply not only consist of drinking water but also include individual and domestic for instant and bubbling and cleaning.

It is to ensure domestic water safe to consumer, domestic water has to be treated before being supply.

water

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Process of water treatment is

  1. Screening– removes objects such as rags, paper, plastics, and metals to prevent damage and clogging of downstream equipment, piping, and appurtenances. Some modern wastewater treatment plants use both coarse screens and fine screens.
  2. Coagulation– process carry out when a coagulant is added to water to destabilize suspensions
  3. Flocculation– After coagulation, the water flows into flocculation basins, where the flow of water is slowed and the floc has time to grow bigger.
  4. Sedimentation– the water flows into sedimentation basins, where the heavy floc particles sink to the bottom and are removed.
  5. Filtration– now the water travels through large filters made of sand, gravel, and anthracite. Filtration removes any remaining microscopic particles and microorganisms.
  6. Disinfection– the water is disinfected to protect it against bacteria. Chlorine is added to ensure that the treated water is free from pathogenic organism. Fluoride is also added support good dental health.
  7. Distribution– The clean water is then pumped into pipes.

 

GROUP MEMBERS

Thanks God for giving us this opportunity to build this website  and record our story together and know each other well.

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Group leader  

Eunice Tang Siew Wen from Sibu, Sarawak 

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 Group Member

Shumiithra Tang A/P Visvanathan from Pontian, Johor

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Siti Nur Aliyah Nordin from Taman Daya Johor Bahru

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Nor Fazira Binti Nor Din from Pasir Mas Kelantan

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Siti Hajar Binti Mohd Jainar from Kota Kinabalu, Sabah

 

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Study Tour to Tanjung Piai

On 24th of september 2017 (Sunday), the two of our group went to Tanjung Piai for a study tour.

This is some photos of the facilities and services that we manage to captured in Tanjung Piai Johor also known as The Southern most Tip of Mainland Asia .

tanjung piai

So, this is a sketches of Tanjung Piai’s layout.

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In case one of you find it difficult to understand the sketches we provide full layout of Tanjung Piai.

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The environmental factors had affected the design, layout and availability of services there and the constraint in providing the services.

As we all know, it is Natural Park responsibility to maintain and support a wide variety of flora and fauna. From our trip investigation, Tanjung Piai are covered an area of over 926 hectares where almost 526 hectares of land is coastal mangrove while the rest of it inter-tidal mudflats. There are only a few building can be found around Tanjung Piai since it is surrounded by coastal mangrove forest so we can only recognize a few services. As we mentioned above, we only identified a few services which is water supply system, electrical and lighting system, sanitary system and safety instrument.  Since there are a few services available, we identified some of the environmental factors.

First and foremost, the unpredictable weather of Malaysia leading to uncertain temperature of that particular area. This can affects in providing services in certain area because not all services can adapt the unpredictable environment such as electrical and lighting system. Like Tanjung Piai in which did not provide any electrical and lighting system along the broadwalk due to hot temperature up to 32 celcius.

Other common environmental factors is air movement. Since Tanjung Piai are located near to the sea, the strong air movement will causes the sea level to rise rapidly. In this case, the installation of sanitary system are efficiently being installed and the material used are usually more water resistant.

Besides, the humidity is one of the environmental factors that had affected the availability of services there. As we all know, moisture is the form of humidity and precipitation can only slow the fire down and reduce its intensity. This means that safety instrument such as fire extinguisher should be installed for safety purpose even though humidity can helps in fire prevention.