National Plumbing Code Of The Philippines, Revised Edition (1999) Part 2

Chemical wastes should not be discharged into the ground because it can contaminate the soil, groundwater, and nearby water bodies. This can have harmful effects on the environment, human health, and wildlife. Proper disposal methods should be followed to ensure the safe handling and treatment of chemical wastes.

The size of vent piping is determined by its length and the total fixture units. Fixture units refer to the amount of water that a plumbing fixture or group of fixtures discharges. Therefore, the correct answer is "fixture units."

Chemical or industrial liquid wastes should be pretreated before their discharge into a drainage system. This is important to remove or reduce any harmful substances or pollutants present in the waste. Pretreatment helps in minimizing the environmental impact and potential harm to aquatic life and ecosystems. By pretreating the waste, it becomes less hazardous and ensures that the drainage system is not contaminated. Simply discharging the waste without pretreatment can lead to pollution and adverse effects on the environment. Mixing with water may dilute the waste, but it does not address the issue of harmful substances. Therefore, pretreatment is necessary before discharging chemical or industrial liquid wastes.

Thrust blocks are installed at all of the above mentioned locations, including changes in direction (tees and bends), changes in size (reducers), stops, and dead ends. Thrust blocks are used to prevent movement or displacement of pipes caused by changes in flow direction, size, or sudden stops. By providing resistance against the thrust forces, thrust blocks ensure the stability and integrity of the pipeline system.

Vertical piping for water supply pipes needs to be supported at each storey. This is important to ensure that the pipes remain stable and do not sag or collapse under the weight of the water flowing through them. Supporting the pipes at each storey helps to distribute the weight evenly and prevent any potential damage or leaks. It also allows for easier maintenance and repairs if needed.

Plumbing fixtures need to be drained into the public sewer or private sewage disposal system by gravity. Gravity allows the wastewater to flow naturally downwards, utilizing the force of gravity to move the water and waste through the pipes and into the sewer system. This is the most common and efficient method of drainage, as it does not require any additional energy or equipment.

A yoke vent is provided at every 5th floor level to ensure proper ventilation in a building. This type of vent allows air to flow in and out of the plumbing system, preventing the buildup of pressure and potential issues such as siphoning or airlock. By installing yoke vents at regular intervals, the plumbing system is able to maintain proper air circulation and prevent any problems that may arise from the lack of ventilation.

Indirect waste pipes exceeding 1.5 meters to 4.6 meters need to be directly trapped to prevent the backflow of sewage or odors, but they do not need to be vented. Venting is typically required for drainage systems to allow for the proper flow of air and prevent the buildup of pressure. However, in the case of indirect waste pipes, the direct trapping is sufficient to ensure proper drainage, and therefore venting is not necessary.

Indirect waste pipes exceeding 1.5 meters to 4.6 meters shall be directly trapped but need not be vented. This means that while these pipes need to have a trap to prevent sewer gases from entering the building, they do not require a separate venting system. Venting is necessary for waste pipes to allow for proper air circulation and to prevent the build-up of pressure, which can cause drain blockages and other plumbing issues. However, in the case of these longer indirect waste pipes, it is not necessary to have a separate venting system.

The minimum distance of a vent from windows, doors, air intake, or vent shafts should be 3 meters. This distance is necessary to ensure proper ventilation and prevent any potential obstructions or interference with the airflow. By keeping the vent at least 3 meters away from these elements, it allows for efficient and effective ventilation throughout the space.

The minimum distance of the vertical vent for outdoor installations from any part of the roof and above such roof is 3 m. This means that the vent must be at least 3 meters away from any part of the roof. Additionally, the vent must be at least 2.1 meters above the roof. This ensures proper ventilation and prevents any potential hazards or obstructions that could occur if the vent is too close to the roof.

The vent pipe may be omitted in all of these scenarios, including an interceptor that acts as a primary settling tank, bar sink, and soda fountains. A vent pipe is typically used to release air and gases from plumbing systems, preventing pressure buildup and allowing for proper drainage. However, in certain situations, such as those listed, the omission of a vent pipe may be acceptable due to the specific design and function of these systems.

The correct answer is 15 meters because the provision of a cleanout at its upper terminal and each run of piping is required at every 15 meters length. This means that for every 15 meters of piping, there should be a cleanout provided to allow for easy access and maintenance of the piping system.

CW & VS stands for Combination Waste and Vent Stack. This term refers to a plumbing system component that serves the dual purpose of carrying waste water and providing ventilation to prevent the build-up of harmful gases. The waste water from various fixtures is channeled into this stack, which then connects to the main sewer line. At the same time, the vent portion of the stack allows air to enter the system, facilitating proper drainage and preventing the formation of vacuum or pressure within the pipes.

The diameter of an individual vent should be at least half the size of the diameter of the drain it is connected to. This ensures proper ventilation and prevents the buildup of pressure in the drainage system. A smaller vent diameter could result in inadequate ventilation and potential blockages in the drain.

The correct answer is "Yes" because according to the given statement, no vent from indirect waste piping should combine with any excreta connected vent. Instead, they should extend separately to the outside air. This implies that there should be no combination or merging of these vents, supporting the answer "Yes."

The correct answer is "suds producing fixtures". This means that these fixtures are capable of producing suds or foam, typically due to the use of soap or detergent. This term is commonly used in plumbing and refers to fixtures that are specifically designed for activities that involve the use of soap or detergent, such as bathing, laundry, and dishwashing.

Vitrified clay pipes should be kept at least 0.3 m below the finish ground level. This is important because it ensures that the pipes are adequately protected and prevents any potential damage or disturbance to the pipes caused by external factors such as traffic load, soil movement, or construction activities. Keeping the pipes at this depth also allows for proper installation and maintenance of the pipes, ensuring their long-term functionality and durability.

The correct answer is "all of the above". This means that all the materials listed - cast iron, ductile iron, galvanized wrought iron, galvanized steel, lead, copper, brass, Series 1000 PVC DWV, and vitrified clay pipe - can be used in excreta drainage pipings.

A countersunk cleanout should be installed where raised heads may cause a hazard to passing personnel or vehicles. The term "countersunk" refers to a type of screw or bolt that is designed to sit flush with the surface it is installed in, minimizing any protrusions that could cause injury or damage. In this context, a countersunk cleanout would be installed in a way that it does not create any raised heads that could pose a hazard to people or vehicles passing by. This ensures safety and prevents accidents.

One Fixture Unit is equivalent to 1 cu. ft/ min. This means that when measuring the flow rate of water through a plumbing fixture, one fixture unit is equal to one cubic foot of water per minute.

Each vent pipe or stack through roof (SVTR) must have flashing that extends all around it and terminates vertically. The flashing should not be less than 15 inches above the roof and not less than 30 inches from any nearby vertical surface. This ensures proper ventilation and prevents any potential damage or leaks caused by water infiltration.

Galvanized wrought iron or galvanized steel pipe should be used underground at least 152 mm above the ground. This requirement ensures that the pipe is adequately protected from moisture, soil corrosion, and potential damage from external factors. By keeping the pipe at this height, it reduces the risk of rusting and extends the lifespan of the pipe, ensuring its durability and functionality.

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The joints at the roof around stack vent pipes need to be made watertight to prevent any water leakage. This is crucial to ensure that water does not seep into the roof and cause damage to the structure or interior of the building. The use of approved flashing material and proper installation techniques will help achieve a watertight seal, providing protection against water infiltration.

The DFU (Drainage Fixture Unit) is a measure of the flow rate of wastewater from a plumbing fixture. When determining the septic tank size, the water closet (toilet) is considered to have a DFU of 6. This means that it has a higher flow rate compared to other fixtures, such as sinks or showers, and therefore requires a larger septic tank to accommodate the wastewater.

A backwater valve is installed to protect drainage piping serving fixtures with flood level rims located below the elevation of the nearby upstream invert of the public sewer from backflow of sewage. This valve prevents sewage from flowing back into the fixtures by allowing wastewater to flow out but closing when there is a reverse flow. It acts as a barrier, ensuring that sewage does not enter the fixtures and cause damage or contamination.

The correct answer is 76 mm, 6. In public installations, the minimum trap or trap arm size for a water closet is typically 76 mm. This size is necessary to accommodate the larger volume of waste that is generated in public settings. Additionally, the DFU (Drainage Fixture Unit) of a water closet in public installations is usually 6. DFU is a measure of the flow rate and load that a plumbing fixture contributes to the overall drainage system.

The minimum distance of the airgap for drainage and the plumbing fixture is 25 mm. This distance is necessary to prevent any backflow or contamination from the drainage system to the plumbing fixture. It ensures that there is enough space for proper drainage and prevents any potential cross-contamination between the two systems. A larger distance would provide even better protection, but 25 mm is the minimum requirement to maintain the integrity and safety of the plumbing system.

Sumps, condensers, or intercepting tanks constructed of concrete need to have walls and bottom with a minimum thickness of 102 mm. Additionally, the inside of these structures should be cement plastered with a minimum thickness of 13 mm. This ensures the durability and integrity of the concrete structure, preventing any leakage or damage.

The correct answer is 1 because the question is asking for the WSFU (Water Supply Fixture Units) of a bar sink, lavatory, and drinking fountain for private use. WSFU is a measure of the demand or flow rate of water fixtures. Since the question does not provide any specific values or criteria for determining the WSFU, it is not possible to provide an exact numerical answer. However, it can be assumed that the WSFU would be relatively low for these fixtures in a private setting compared to a commercial or public setting.

The minimum trap size and DFU (Drainage Fixture Unit) requirement for a water closet in a private installation is 76 mm and 4 respectively. This means that the trap arm, which is the horizontal pipe that connects the trap to the drain, should have a minimum diameter of 76 mm. Additionally, the water closet is assigned a DFU value of 4, indicating its drainage capacity. This ensures proper drainage and prevents clogs or backups in the plumbing system.

The correct answer is "outside" because cleanouts for an interceptor should be located outside of the interceptor itself. This ensures easy access for maintenance and cleaning purposes without the need to enter the interceptor. Placing the cleanout on the inside would make it difficult to reach and may require disassembling the interceptor, causing inconvenience and potential damage.

The owner is required to maintain a permanent record of the location of all pipings and venting carrying chemical waste. This means that the record should be kept indefinitely and should not be subject to change or removal. A permanent record ensures that there is a reliable and long-lasting documentation of the location of these important components, which is crucial for safety, maintenance, and regulatory compliance purposes.

The correct answer is 76 mm, 6. In plumbing, the trap arm is the horizontal pipe that connects the P-trap to the sanitary tee. The trap arm size refers to the diameter of this pipe. In the case of a mobile home, the minimum trap arm size required is 76 mm (3 inches). DFU stands for Drainage Fixture Unit, which is a measure of the flow rate of wastewater from different plumbing fixtures. A mobile home typically has a DFU of 6, meaning it can handle a moderate amount of wastewater. Therefore, the correct answer is 76 mm, 6.

The answer 2.5, 4 indicates the water flow rate for a water closet (economical flush) in both private and public settings. This means that the water closet uses 2.5 liters per flush in private settings and 4 liters per flush in public settings. The higher water flow rate in public settings is likely due to the higher usage and need for more efficient flushing to maintain cleanliness and hygiene.

The answer 6,10 indicates the water flow rate (in liters per minute) for a water closet with a flushometer valve and a water supply outlet of 25 mm. This means that when the flushometer valve is activated, the water closet will have a flow rate of 6 liters per minute for solid waste and 10 liters per minute for liquid waste.

The correct answer is 2 because the question is asking for the WSFU (Water Supply Fixture Units) of various fixtures used for private use. WSFU is a measure of the demand on a water supply system. The fixtures listed, such as the bath tub, bidet, laundry tub, shower head, and sink (dishwasher), are all commonly found in residential settings. Therefore, the WSFU for these fixtures would be based on their typical usage in a private household.

The correct answer is VSTR. This stands for Vent Stack Through Roof. According to the given information, the vent through the roof should be increased by 1 pipe size above the reconnection point of the stack vent and horizontal vent. This means that the vent stack should be extended through the roof and its size should be increased by 1 pipe size at the point where it reconnects with the stack vent and horizontal vent.

Based on the given information, the value of "a" is 38.

The correct answer is 38 mm, 2. This means that the minimum trap size and DFU (drainage fixture unit) for bathtubs, bidets, laundry tubs, bar sinks, and other sinks, including wash basins, is 38 mm with a DFU of 2. This indicates the recommended size and capacity for the trap and drainage system to effectively handle the waste water from these fixtures.

Galvanized iron pipe is not applicable as a vent pipe for fixtures where acid or corrosive chemicals are placed. Galvanization is a process that involves coating iron or steel with a layer of zinc to prevent corrosion. However, this coating is not resistant to strong acids or corrosive chemicals, making galvanized iron pipe unsuitable for such applications.

The answer 3,6 indicates the water flow rate in gallons per minute (GPM) for a water closet with a flushometer valve and a water supply outlet of 19 mm. A WFSU (Water Flow Supply Unit) of 3 GPM means that the water closet will have a moderate water flow, while a WFSU of 6 GPM suggests a higher water flow rate. Therefore, the combination of 3,6 represents the range of water flow rates for this particular setup.

The minimum trap/trap arm size and DFU of a drinking fountain is 31 mm and 1, respectively. This means that the trap and trap arm of the drinking fountain should have a minimum diameter of 31 mm, and it can handle a Drainage Fixture Unit (DFU) value of 1. The DFU value is a measure of the potential load that a plumbing fixture or group of fixtures can put on a drainage system. In this case, the drinking fountain has a relatively small drain size and a low DFU value, indicating that it has a lower water flow and waste load compared to larger fixtures.

This question is asking for a requirement for indirect waste interceptors that receive discharge containing particles that can clog the receptor drain. The correct answer is a "beehive strainer." A beehive strainer is a type of removable strainer that is commonly used in plumbing systems to prevent solid particles from entering and clogging the drain. It is designed to be easily removable for cleaning or maintenance purposes.

The correct answer is 51 mm, 3. This means that the minimum trap arm size for a wall-mounted urinal is 51 mm and it can handle a Drainage Fixture Unit (DFU) of 3. The trap arm size refers to the diameter of the pipe that connects the trap to the main drainage system. The DFU is a measure of the flow rate and load that a plumbing fixture places on the drainage system. In this case, a wall-mounted urinal with a trap arm size of 51 mm can handle a DFU of 3, indicating its capacity to efficiently drain waste from the fixture.

Cleanouts are access points in a drainage system that allow for the removal of blockages or obstructions. However, pressure drainage systems are designed to move wastewater using pressure rather than gravity, so they do not require cleanouts. Therefore, cleanouts shall not be provided for pressure drainage systems, making the answer "no" correct.

The diameter of the individual vent is typically smaller than the diameter of the drain. This is because the vent is responsible for allowing air to enter the plumbing system, preventing airlock and ensuring proper drainage. A smaller diameter vent can effectively perform this function without obstructing the flow of water. The range of 1/2" - 1 1/4" indicates the typical sizes for individual vents in plumbing systems.

Closet rings need to be tightly fastened with corrosively resistant fasteners up to the floor with the top surface 1/4" above the finish floor. This is because corrosively resistant fasteners are designed to withstand corrosion caused by moisture or chemicals, which are common in bathrooms or areas where water is present. Using such fasteners ensures that the closet rings will remain securely in place and resistant to deterioration over time.

The minimum distance of the vent above window, doors, air intake or vent shaft and away from any lot line, alley, and street boundary lines is 0.9 m. This is the required distance to ensure proper ventilation and to prevent any obstruction or interference with the vent's functionality. It allows for sufficient airflow and prevents any potential safety hazards or code violations.