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Questions and Answers
The pipe is called a ______ pipe when it receives human waste from the soil branch.
The pipe is called a ______ pipe when it receives human waste from the soil branch.
soil
Pipe installations that fail or break too soon may have been due to the use of too many ______.
Pipe installations that fail or break too soon may have been due to the use of too many ______.
fittings
Do not use short radius ______ on a vertical to horizontal directions or horizontal to horizontal changes.
Do not use short radius ______ on a vertical to horizontal directions or horizontal to horizontal changes.
fittings
The waste pipe installation must be provided with an ample number of ______, strategically located, to be opened in case of pipeline trouble.
The waste pipe installation must be provided with an ample number of ______, strategically located, to be opened in case of pipeline trouble.
A ______ is a receptacle of the plumbing system accessible on floor, walls, or ceiling.
A ______ is a receptacle of the plumbing system accessible on floor, walls, or ceiling.
The location of the ______ must be indicated in the plan.
The location of the ______ must be indicated in the plan.
The Y and 45˚ ______ are most appropriate for vertical to horizontal direction of changes.
The Y and 45˚ ______ are most appropriate for vertical to horizontal direction of changes.
The use of the T ______ on horizontal installation will create a tilted or crooked joint connection called ‘Premature Waste Line Defects’.
The use of the T ______ on horizontal installation will create a tilted or crooked joint connection called ‘Premature Waste Line Defects’.
The cleanout must be sized equal to the diameter of the ______ pipe.
The cleanout must be sized equal to the diameter of the ______ pipe.
Cleanouts may be omitted on a horizontal drain line less than ______ meter in length.
Cleanouts may be omitted on a horizontal drain line less than ______ meter in length.
Each horizontal drainage pipe shall be provided with a cleanout at its ______ terminal.
Each horizontal drainage pipe shall be provided with a cleanout at its ______ terminal.
Cleanouts may be omitted on short horizontal drainage pipe installed at a slope of ______ degrees or less from the vertical line.
Cleanouts may be omitted on short horizontal drainage pipe installed at a slope of ______ degrees or less from the vertical line.
Table 7-4 shows the size of pipe and the corresponding size of ______.
Table 7-4 shows the size of pipe and the corresponding size of ______.
Cleanouts are required every ______ meter length of horizontal drainage pipe.
Cleanouts are required every ______ meter length of horizontal drainage pipe.
Waste pipe and soil pipe are covered in Section ______ of the Revised National Plumbing Code of the Philippines.
Waste pipe and soil pipe are covered in Section ______ of the Revised National Plumbing Code of the Philippines.
The cleanout must be readily accessible to the ______ in case of waste line stoppage.
The cleanout must be readily accessible to the ______ in case of waste line stoppage.
Each cleanout in piping larger than ______ mm shall have a clearance of not less than 0.45 m.in front of the cleanout.
Each cleanout in piping larger than ______ mm shall have a clearance of not less than 0.45 m.in front of the cleanout.
Minimum clearance “X” is ______ mm if pipe size “D” = 51 mm or less.
Minimum clearance “X” is ______ mm if pipe size “D” = 51 mm or less.
Cleanouts in underfloor piping shall be extended to or above the ______ floor or shall be extended outside the building when there is less than 0.45 m.vertical and 0.75 m.horizontal clearance from the means of access to such cleanout.
Cleanouts in underfloor piping shall be extended to or above the ______ floor or shall be extended outside the building when there is less than 0.45 m.vertical and 0.75 m.horizontal clearance from the means of access to such cleanout.
No underfloor cleanout in any residential occupancy shall be located more than ______ m.from an access door, trap door, or crawl hole.
No underfloor cleanout in any residential occupancy shall be located more than ______ m.from an access door, trap door, or crawl hole.
Cleanout fittings shall be not less than in size than those given in Table ______.
Cleanout fittings shall be not less than in size than those given in Table ______.
Cleanout shall be provided for ______ drainage system.
Cleanout shall be provided for ______ drainage system.
Countersunk cleanout plugs shall be installed where raised heads may cause hazard to ______ personnel or vehicles.
Countersunk cleanout plugs shall be installed where raised heads may cause hazard to ______ personnel or vehicles.
Countersunk cleanout plugs shall be installed where raised heads may cause hazard to passing ______ or vehicles.
Countersunk cleanout plugs shall be installed where raised heads may cause hazard to passing ______ or vehicles.
An approved type of two-way ______ fitting, may be substituted for an upper terminal cleanout.
An approved type of two-way ______ fitting, may be substituted for an upper terminal cleanout.
Each ______ extension shall be considered as drainage piping.
Each ______ extension shall be considered as drainage piping.
Each ninety 90 degrees ______ extension shall be extended from a wye type fitting or other approved fitting of equivalent sweep.
Each ninety 90 degrees ______ extension shall be extended from a wye type fitting or other approved fitting of equivalent sweep.
Each ______ for an interceptor shall be outside of each interceptor.
Each ______ for an interceptor shall be outside of each interceptor.
Each ______, unless installed under an approved cover plate, shall be above grade, readily accessible, and so located to serve the purpose it is intended.
Each ______, unless installed under an approved cover plate, shall be above grade, readily accessible, and so located to serve the purpose it is intended.
Each ______ in piping 51 mm or less in size shall be installed so that there is a clearance of not less than 305 mm in front of the ______.
Each ______ in piping 51 mm or less in size shall be installed so that there is a clearance of not less than 305 mm in front of the ______.
A ______ type of two-way cleanout fitting, installed inside the building wall near the connection between the building drain and building sewer or installed outside of a building at the lower end of the building drain and extended to grade, may be substituted for an upper terminal cleanout.
A ______ type of two-way cleanout fitting, installed inside the building wall near the connection between the building drain and building sewer or installed outside of a building at the lower end of the building drain and extended to grade, may be substituted for an upper terminal cleanout.
SECTION 706 deals with ______ in the REVISED NATIONAL PLUMBING CODE OF THE PHILIPPINES.
SECTION 706 deals with ______ in the REVISED NATIONAL PLUMBING CODE OF THE PHILIPPINES.
Increasing the size of the drainage pipe does not guarantee effective ______ action, or self-cleaning ability of the pipe.
Increasing the size of the drainage pipe does not guarantee effective ______ action, or self-cleaning ability of the pipe.
Water flow inside a larger pipe is relatively ______.
Water flow inside a larger pipe is relatively ______.
Drainage pipe must be of the right size to have a liquid flow of about ______ % of the pipe diameter.
Drainage pipe must be of the right size to have a liquid flow of about ______ % of the pipe diameter.
For instance, if the pipe is 100mm diameter, the water flow inside the pipe must have a depth of ______ mm to attain the scouring action.
For instance, if the pipe is 100mm diameter, the water flow inside the pipe must have a depth of ______ mm to attain the scouring action.
Too small pipeline is subject to ______ of flow.
Too small pipeline is subject to ______ of flow.
The tendency is to create ______, siphonage, and floor flooding.
The tendency is to create ______, siphonage, and floor flooding.
Waste Pipe is classified into two types depending upon the kind of ______ it will serve.
Waste Pipe is classified into two types depending upon the kind of ______ it will serve.
See Revised NPCP.Table ______-2 Page. 80
See Revised NPCP.Table ______-2 Page. 80
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Study Notes
Waste Pipe and Soil Pipe
- Waste pipe is classified into two types depending on the kind of fixtures it will serve.
- Soil pipe receives human waste from soil branch.
- Stack pipe is installed vertically and is classified as a Waste Stack if not.
Conservative Use of Fittings
- Using too many fittings or the wrong type of fittings can cause pipe installations to fail or break too soon.
- Recommendations for using fittings:
- Avoid short radius fittings on vertical to horizontal directions or horizontal to horizontal changes.
- Use long sweep fittings on horizontal changes.
- Use Y and 45° fittings on vertical to horizontal direction changes.
- T fittings are designed for vertical run with lateral branches only and should not be used on horizontal installations.
Location of Cleanout
- Cleanout is a receptacle of the plumbing system accessible on floor, walls, or ceiling.
- Cleanout must be indicated in the plan and sized equal to the diameter of the waste pipe.
- Cleanout must be readily accessible to the plumber in case of waste line stoppage.
- Location of cleanout must be indicated in the plan.
Revised National Plumbing Code of the Philippines (Section 706. Cleanouts)
- Each horizontal drainage pipe shall be provided with a cleanout at its upper terminal and every 15 meters length.
- Cleanouts may be omitted on horizontal drain lines less than 1.50 meters in length unless serving sinks or urinals.
- Cleanouts may be omitted on short horizontal drainage pipes installed at a slope of 72 degrees or less from the vertical line.
- An approved type of two-way cleanout fitting may be substituted for an upper terminal cleanout.
- Each cleanout extension shall be considered as drainage piping.
- Each cleanout for an interceptor shall be outside of each interceptor.
- Each cleanout, unless installed under an approved cover plate, shall be above grade, readily accessible, and so located to serve the purpose it is intended.
Cleanout Size and Clearance
- Size of cleanout and threads per 25.4 mm:
- 38 mm pipe: 38 mm cleanout, 11-1/2 threads per 25.4 mm
- 51 mm pipe: 38 mm cleanout, 11-1/2 threads per 25.4 mm
- 64 mm pipe: 64 mm cleanout, 8 threads per 25.4 mm
- 76 mm pipe: 64 mm cleanout, 8 threads per 25.4 mm
- 102 mm pipe and larger: 89 mm cleanout, 8 threads per 25.4 mm
- Minimum clearance in front of the cleanout:
- 305 mm for pipes 51 mm or less in size
- 450 mm for pipes larger than 51 mm in size
Uniform Plumbing Code Committee's Findings
- Increasing the size of the drainage pipe does not guarantee effective scouring action or self-cleaning ability of the pipe.
- Water flow inside a larger pipe is relatively shallow, causing solid waste to remain at the bottom of the pipe.
- Drainage pipe must be of the right size to have a liquid flow of about 50% of the pipe diameter.
- For instance, if the pipe is 100 mm diameter, the water flow inside the pipe must have a depth of 50 mm to attain the scouring action.
- Too small a pipeline is subject to overloading of flow, creating back-pressure, siphonage, and floor flooding.
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