National Plumbing Code Of The Philippines, Revised Edition (1999)

When a public or private sewer is not available for use, excreta drainage piping from buildings and premises should be connected to an approved private sewage disposal system. This system is designed to safely and effectively dispose of sewage from individual buildings or premises when there is no access to a public sewer. It ensures proper sanitation and prevents the contamination of the environment. The other options, such as public sewage disposal system or sanitary sewage disposal system, may not be applicable in this scenario as they require the presence of a public or private sewer.

Lead pipe should be supported vertically at intervals not exceeding 1.2 meters at centers with a rigid vertical backup. This means that there should be a support every 1.2 meters along the length of the pipe to ensure that it is properly held in place and does not sag or become damaged. The rigid vertical backup provides additional stability and prevents the pipe from bending or collapsing under its own weight.

Hot and cold water supply systems should be tested under 150% water pressure. This means that the pressure applied during the testing should be 1.5 times the normal operating pressure of the system. Testing at this increased pressure ensures that the system can withstand higher pressures and prevents any potential leaks or failures when the system is in use.

A pressure regulator is installed when there is excessive water pressure. It helps to control and reduce the water pressure to a safe and manageable level. This is important because high water pressure can cause damage to pipes, fixtures, and appliances. By installing a pressure regulator, the water pressure is regulated, preventing any potential issues that may arise from excessive pressure.

The correct answer is Presidential Decree No. 856. This decree, also known as the Code on Sanitation, was promulgated by President Ferdinand Marcos on December 23, 1975. It is a significant piece of legislation that aims to ensure public health and safety by establishing standards and regulations for sanitation practices.

The joint between the fixture and wall or floor should be made water tight to prevent any leakage or seepage of water. This is important to ensure that there are no water damages or moisture-related issues, such as mold growth, which can occur if there is any water leakage. Making the joint water tight will help maintain the integrity of the fixture and the surrounding area, preventing any potential damage or problems.

An excessive water pressure refers to a water pressure that is higher than the standard or recommended level. In this case, the correct answer is 551 kPa, as it is the highest value among the given options. This implies that any water pressure above 551 kPa would be considered excessive.

The correct answer is Philippine Clean Water Act of 2004. This act, also known as RA 9275, is a law in the Philippines that aims to protect and conserve the country's water resources. It provides guidelines and regulations for the prevention, control, and abatement of water pollution. The act also establishes the framework for the sustainable management of water resources and the protection of water quality. It addresses various aspects of water pollution, including industrial and domestic wastewater, solid waste management, and water quality monitoring. This law is an important tool in ensuring the cleanliness and sustainability of the Philippines' water sources.

The correct answer is Gauge No. 16 U.S. B&S. This gauge refers to the thickness of the sheet steel used for restaurant kitchen and special-use sinks. A gauge number of 16 indicates a thickness of 1.6 mm, which meets the minimum requirement stated in the question. Therefore, sinks made of sheet steel with a gauge number of 16 are suitable for use in these specific settings.

Fixtures with concealed slip joint connections need to have an access panel or utility that is at least 300 mm in size for inspection and repair purposes. This size allows for sufficient access to the connections, ensuring that any necessary maintenance or repairs can be carried out effectively.

The correct answer is Health Officer. The health officer is responsible for ensuring the safety and sanitation of buildings for human habitation. They have the authority to approve the installation of toilets in buildings, including dry or chemical closets. This is to ensure that proper sanitation measures are in place to protect the health and well-being of the occupants.

The correct answer is 3 meter of head for 15 minutes. This means that the water test should be conducted by applying a pressure of 3 meters of head (equivalent to a column of water 3 meters high) for a duration of 15 minutes. This test is used to check the integrity and functionality of drainage and vent systems, ensuring that there are no leaks or blockages.

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A vacuum breaker is necessary to protect the water supply to a urinal or any other backflow prevention device. A vacuum breaker prevents the backflow of contaminated water into the clean water supply by allowing air to enter the system and break the vacuum that could cause the backflow. Without a vacuum breaker, there is a risk of contamination and potential health hazards. A pressure relief valve, angle valve, or P-trap are not specifically designed for this purpose and would not provide the necessary protection against backflow.

The correct answer is 34.5 kpa gage pressure, 245 mmHg for 15 minutes. This is the correct answer because it follows the given instructions for the air test. The question states that the air test shall be made by attaching an air compressor testing apparatus. The pressure should be 34.5 kpa gage pressure and the pressure should be maintained for 10 minutes. Additionally, the pressure should be 245 mmHg and this pressure should also be maintained for 15 minutes. Therefore, the correct answer is 34.5 kpa gage pressure, 245 mmHg for 15 minutes.

Copper tubing needs to be supported horizontally at intervals of approximately 1.8 m for piping with a diameter of 38 mm and below, and at intervals of approximately 3.0 m for piping with a diameter of 51 mm and larger.

Tunnels should have a clear height of 0.6 m above the pipe and shall be limited in length to 1/2 the depth of the trench with a maximum length of 2.4 m. This means that the height of the tunnel should be at least 0.6 m above the pipe to provide sufficient clearance. The length of the tunnel should not exceed half the depth of the trench, ensuring stability and safety. The maximum length of 2.4 m is set to prevent excessive excavation and potential collapse of the tunnel.

All shower compartments, regardless of their shape, should have a minimum finished interior area of 0.6 sq. m. This requirement ensures that there is enough space for a person to comfortably stand and move around in the shower. A larger interior area would be even more desirable, but 0.6 sq. m. is the minimum acceptable size.

The correct answer is "all of the above". Potable water inlets to gravity tanks can be controlled by a float valve, a float switch, or an electrode-type water level system. These control mechanisms are designed to prevent the tank from overflowing by regulating the water level and shutting off the inlet when the desired level is reached.

The area of the small holes of the strainer plate of a floor drain is equivalent to the area of the tail piece. The tail piece is a pipe that connects the drain to the plumbing system. The small holes in the strainer plate allow water to flow through and prevent debris from entering the drain. The tail piece also serves the same purpose by providing a pathway for water to drain out while keeping larger objects from clogging the plumbing system. Therefore, the area of the small holes of the strainer plate is equivalent to the area of the tail piece.

Drains in gutters should be spaced not more than 4.9 m apart. This spacing is necessary to ensure effective drainage and prevent water from overflowing or pooling in the gutter system. A closer spacing allows for better water flow and reduces the risk of clogs or blockages. It also helps to distribute the load evenly across the gutter system, preventing excessive strain on individual drains.

PD 1067 is the correct answer because it is known as the Water Code of the Philippines. This code was enacted to provide a comprehensive framework for the management, development, and conservation of water resources in the country. It covers various aspects such as water rights, water quality, water supply, and water pollution control. PD 1067 plays a crucial role in ensuring sustainable water management practices and protecting the water resources of the Philippines.

The correct answer is 45 deg. or 60 deg. wye, combination wye & 1/8, sanitary tee or other approved fittings of longer sweeps. This is because horizontal drainage lines should enter the vertical stack at an angle of 45 degrees or 60 degrees to ensure proper flow and prevent clogging. The combination wye & 1/8 fitting allows for a smooth transition from the horizontal line to the vertical stack. The sanitary tee or other approved fittings of longer sweeps help to maintain the flow and prevent blockages in the drainage system.

The correct answer is 1:100. This ratio indicates that for every 1 unit of measurement on the laundry tray, there should be 100 units of measurement on the slop sink. This suggests that the slop sink is larger or has a greater capacity compared to the laundry tray.

The correct answer is November 28, 1967. This is the date when the first amendment of the National Plumbing Code was implemented, which included Asbestos-Cement pipe as approved plumbing materials.

The correct answer is 0.762 m. This means that all shower compartments should be able to accommodate a circle with a diameter of 0.762 meters. This requirement ensures that the shower space is large enough to comfortably fit a person and allows for easy movement and use of the shower.

R.A. No. 6541 is the correct answer because it is known as the National Building Code of the Philippines. This law sets the standards and regulations for the design, construction, and occupancy of buildings in the country. It aims to ensure the safety and welfare of the public by providing guidelines for building materials, structural design, fire protection, electrical systems, and other aspects of construction. R.A. No. 1378, R.A. No. 962, and R.A. No. 2411 are not related to building codes and do not pertain to the National Building Code of the Philippines.

Vertical drainage lines connecting to horizontal drainage should enter through 45 degree branches or other approved fittings of longer sweeps. However, when these branches or fittings are installed in a true vertical position, they should be at a 60 degree angle. This ensures proper flow and prevents clogging or blockages in the drainage system.

Tunnels need to be back-filled with clean earth in thin layers to protect the pipes from damage or corrosive action. The thickness of each layer should be 0.3 meters, as stated in the correct answer. This ensures that the back-fill material is not too heavy or contains any materials that could harm the pipes.

Water closet and urinal flushometer valves need to be equipped with a listed atmospheric vacuum breaker. This device prevents backflow of contaminated water into the potable water supply system. It works by allowing air to enter the system when there is a drop in pressure, creating a barrier that prevents the reverse flow of water. This is an important safety measure to ensure the purity of the water supply and prevent contamination.

Small-sized malleable iron water fittings should be galvanized. Galvanization involves coating the iron fittings with a layer of zinc, which helps protect them from corrosion and rusting. This is particularly important for water fittings as they are constantly exposed to moisture. Galvanized fittings have a longer lifespan and are more durable compared to other materials like copper, plastic, or brass. Therefore, galvanized is the correct choice for small-sized malleable iron water fittings.

The maximum lead content allowed for water pipes and fittings is 8%. This means that any pipes or fittings used for water systems should not contain more than 8% of lead. This regulation is in place to ensure that drinking water remains safe and free from lead contamination, as high levels of lead can be harmful to human health.

The Revised National Plumbing Code of the Philippines was approved on December 21, 1999.

The shower receptor needs to be tested for water tightness to ensure that it is properly sealed and does not leak water. This is important to prevent water damage and maintain the functionality of the shower. Testing for air tightness is not necessary as it is not relevant to the purpose of a shower receptor. Therefore, the correct answer is water tightness.

The correct answer is 22 1/2 degree, 45 degree, 60 degree bend or other approved fittings of longer sweeps. This means that when making changes in direction of drainage piping, it is necessary to use pipe fittings that have angles of 22 1/2 degrees, 45 degrees, or 60 degrees, or other fittings that have longer sweeps. Longer sweeps refer to fittings that have a gentler curve, allowing for smoother flow of water and preventing clogs or blockages in the drainage system.

The correct answer is 3.6 meters because for larger diameter pipes, a horizontal support of 3.6 meters is required. This support ensures that the pipe is securely held in place and prevents any sagging or bending. It is important to have a strong and stable support for larger pipes to maintain their structural integrity and prevent any potential damage or leaks.

Each shower receptor must have a finished dam, curb, or threshold that is at least 1 inch high. This requirement ensures that water is contained within the shower area and prevents it from flowing out onto the bathroom floor. A higher dam, curb, or threshold would provide even better water containment, but the minimum requirement is 1 inch.

The correct answer is ballcock. In order to prevent overflow, water closet and urinal tanks should be equipped with a listed ballcock installed with the centerline at least 25mm above the overflow pipe. A ballcock is a valve that controls the flow of water into a tank. It is designed to automatically shut off the water supply when the tank is full, preventing any overflow.

The correct answer is January 28, 1959. This date represents when the National Plumbing Code of the Philippines, which was prepared by NAMPAP (National Master Plumbers Association of the Philippines), was officially promulgated and approved by Malacañang.

The correct answer is "at every 3.0 meter." This means that a screwed pipe or Iron Pipe Size horizontal support should be installed at intervals of 3.0 meters for pipes with a diameter of 19mm and smaller. This spacing ensures proper support and stability for the pipes, preventing them from sagging or failing under their own weight.

In situations where there is a risk of skin contamination with poisonous, infectious, or irritating materials, it is important to provide an adequate number of lavatories to ensure proper hygiene and prevent the spread of contaminants. The correct answer of "1 lavatory : 5 persons" suggests that for every 5 persons, there should be one lavatory available. This ratio allows for more frequent use and reduces the chances of contamination, ensuring the safety and well-being of individuals in such environments.

The correct answer is "a and b". Ferrous piping should have an outside protective coating, such as bitumastic coating, to prevent corrosion. Similarly, if copper tubing is laid underground, it should be externally protected with fiberglass wrapping to provide additional protection against corrosion.

Having an independent system for two buildings is not an exception if one building stands in the rear of another building. The location of the buildings, whether they are side by side, in the front, or 2 meters away from each other, does not affect the need for an independent system. An independent system is necessary to ensure that each building has its own infrastructure and utilities, such as electricity, water, and HVAC systems. Therefore, the correct answer is that there is no exception in having an independent system for two buildings, regardless of their relative positions.

Special shower compartments for wheelchair use may eliminate the minimum distance between the door to the drain opening because they are designed to provide enough space for a wheelchair to maneuver comfortably. A distance of 1.2 m ensures that there is ample room for a wheelchair to enter and turn around within the shower compartment without any obstruction from the door or drain opening. This allows individuals using wheelchairs to easily access and use the shower without any difficulty or inconvenience.

The given correct answer is the Pressure Vacuum Breaker Backflow Prevention Assembly (PVB). This device is made up of a loaded air inlet valve, internally loaded check valve, two test cocks, and two isolation gate valves. It is designed to prevent backflow by creating a barrier of air between the water supply and the potential contaminants. When there is a drop in pressure in the water supply, the loaded air inlet valve opens, allowing air to enter the system and preventing the backflow of water. This device is commonly used in irrigation systems and is an effective method of protecting the water supply from contamination.

The CISP supports need to be placed within a certain distance of the hub or joint in order to maintain alignment and prevent sagging. The correct answer is 0.45 m, indicating that the supports should be placed within 0.45 meters of the hub or joint. This distance ensures that the supports are adequately positioned to provide the necessary support and prevent any potential sagging in the CISP system.

The given correct answer is "Reduced Pressure Principle Backflow Prevention Assembly (RP)". This is because the description provided matches the features of an RP assembly, which includes two check valves, a differential pressure relief valve, test cocks, and isolation gate valves. The RP assembly is designed to provide a higher level of protection against backflow, making it suitable for high-risk applications where the potential for contamination is significant.

The correct answer is Gauge No. 20. This means that the continuous waste and fixture tailpiece can be constructed from seamless drawn brass that is not less than 0.8 mm in thickness. This gauge number indicates the thickness of the material, with a lower gauge number indicating a thicker material. Therefore, Gauge No. 20 meets the requirement for the thickness of the material for the waste and fixture tailpiece.

The primary purpose of the National Plumbing Code of the Philippines is to provide comprehensive guidelines for the design, installation, and maintenance of plumbing systems. This ensures safety, sanitation, and reliability in plumbing infrastructure. It covers aspects like materials, installation procedures, and safety standards, aiming to protect public health and welfare. The other options do not accurately reflect the main objective of the code.

The correct answer is 45 deg. wye, combination wye & 1/8 or other approved fittings of longer sweeps. This is because horizontal drainage lines need to connect to other horizontal drainage lines in a smooth manner to ensure proper flow of wastewater. The 45 degree wye fitting allows for a gradual change in direction, reducing the likelihood of clogs or blockages. The combination wye and 1/8 fitting further helps to maintain a smooth flow by providing a gradual transition between different pipe sizes. The longer sweeps on these fittings also help to minimize turbulence and maintain the velocity of the wastewater.

The correct answer is 2% - 4%. This range of slope is necessary for the finished floor of the receptor. A slope of 2% - 4% ensures proper drainage and prevents water from pooling on the floor. This slope allows water to flow towards the drain efficiently and prevents any potential water damage or safety hazards.

The correct answer is 25 mm, 38 mm, 51 mm, 2 times diameter of effective opening. This can be determined by analyzing the given table, which states that the minimum airgaps for water distribution are based on the diameter of the effective opening. The values of a, c, e, and g correspond to the effective openings, and the values are given as 2 times the diameter of the effective opening. Therefore, the correct answer is 25 mm, 38 mm, 51 mm, 2 times diameter of effective opening.

A lift pump is a type of pump that is used to lift water from a lower level to a higher level. It does not provide greater pressure, but rather helps in moving water from a lower elevation to a higher elevation. On the other hand, hydro-pneumatic pressure tank, elevated tank, and booster pump are all designed to increase water pressure in a system. Therefore, lift pump is the exception in this case.

The correct answer is 51 mm / 228 mm. This means that the minimum depth of any dam or threshold should be 51 mm when measured from the top to the drain, and the maximum depth should be 228 mm. This ensures that there is a sufficient depth to effectively control water flow and prevent any potential damage or overflow.

The building sewer test can be conducted using either a water test or a low pressure air test. Both methods are commonly used to check for leaks or any other issues in the building sewer system. The water test involves filling the sewer system with water and checking for any leaks or drops in water levels. On the other hand, the low pressure air test involves pressurizing the sewer system with air and monitoring for any air leaks. Both tests are effective in identifying potential problems in the building sewer system.