24 Questions
What is the purpose of a catch basin?
To retain liquids and settleable materials
What is the minimum slope required for drainage pipes between manholes?
2% for all pipe sizes
What is used to change the direction of drainage flow?
Approved pipe fittings
What is the purpose of a downspout?
To connect the roof gutter to the leader
Under what conditions can a slope of less than 2% be approved?
When the drainage line is excessively deep
What is the purpose of a leader or conductor?
To connect the roof gutter to the downspout
What is stormwater?
Rainfall that flows over the surface
What is the purpose of flashing?
To prevent water from seeping behind another piece of metal or wood
What is the purpose of encasing pipes with a polyethylene sheath?
To protect the pipe from external corrosion
What is the minimum clearance required for pipes passing under or through walls?
Embedded metal pipe sleeves
What is the maximum length of tunnels for trenching?
1/2 the depth of the trench
What is the recommended material for backfilling trenches?
Clean earth without stones or boulders
What is the minimum distance required for building sewers or drainage piping from adjacent buildings?
0.6m from the building or structure
What is the purpose of sealing the void between pipes and sleeves through concrete floors?
To prevent water ingress
What is the requirement for driven pipes in trenching?
At least one pipe size larger than the pipe to be laid
What is the minimum angle required for the bottom of pipe trenches deeper than the footing of adjacent buildings?
45 degrees
What type of branch is approved for connecting horizontal drainage lines to other horizontal drainage lines?
45 wye branch
What is prohibited for use in vertical drainage lines?
Double hub fitting
What type of fitting is allowed for use on vertical lines as a fixture connection?
Double hub sanitary tapped tee
What is prohibited for making connections to drainage or vent piping?
Drilling and tapping
What type of connection is prohibited for making to a closet bend or stub of a water closet or similar fixtures?
Waste connection
What is allowed for use in joining hubless cast iron soil pipes?
Approved stainless steel bands with neoprene gaskets
What type of branch is approved for connecting horizontal drainage lines to a vertical stack?
45 wye branch
What is prohibited for use in cast iron soil pipes?
Threading
Study Notes
Protection of Piping, Materials, and Structures
- No vent pipe shall be used as a soil or waste pipe, and vice versa.
- All piping passing under or through walls shall be protected from breakage with embedded metal pipe sleeves.
- Pipes passing through or under corrosive materials shall be protected from external corrosion by encasing them with a polyethylene sheath or in another approved manner.
- The void between pipes and sleeves through concrete floors in the ground shall be sealed with bitumen.
Trenching, Excavation, and Backfill
- Tunnels shall have a clear height of 0.6m above the pipe and shall be limited in length to 1/2 the depth of the trench.
- Tunnels shall have a maximum length of 2.4m and shall be limited in length to 1/2 the depth of the trench.
- Driven pipes shall have at least one pipe size larger than the pipe to be laid.
- Trenches shall be back-filled in thin layers of 0.3m above the top of the pipe with clean earth, which shall not contain stones, boulders, cinders, or other materials that can damage or break the pipes or cause corrosive action.
Minimum Uniform Slope
- The minimum uniform slope between manholes is 26.
Vertical Drainage Lines
- Vertical drainage lines connecting to other horizontal drainage lines shall use 45-degree wye branches, or other approved fittings of longer sweeps.
- 60-degree branches or offsets are allowed only for pipes installed in a true vertical position.
Horizontal Drainage
- Horizontal drainage to a vertical stack shall use 45-degree wye branches, combination wye and 1/8 bend branches, or other approved fittings of longer sweeps.
- Horizontal drainage to other horizontal drainage lines shall use 45-degree wye branches, combination wye and 1/8 bend branches, or other approved fittings of longer sweeps.
Prohibited Fittings and Practices
- No drainage fitting shall use double hub fittings for leak-caulked joints in vertical positions, single or double tee branches, single or double tapped tee branches, side inlet quarter bends, or running threads, bands, or saddles.
- Except that double hub sanitary tapped tee may be used on vertical lines as a fixture connection.
- No cast iron soil pipe shall be threaded.
General Regulations
- Drainage pipes shall be run in practical alignments and at a uniform slope of not less than 20mm/m or 2% toward the point of disposal.
- If it is impracticable to obtain such a slope due to excessive depth, structural or geological features, or existing adverse arrangements, a slope of 0.5% for 203mm and larger pipes, or 1% for 102mm to 152.4mm pipes, may be approved by the Administrative Authority.
Changes in Direction of Drainage Flow
- Changes in direction of piping shall be made by the use of approved pipe fittings and shall be at angles presented by 22 ½ degrees bend, 45 degrees bend, or 60 degrees bend or other approved fittings of longer sweeps.
This quiz covers the rules and regulations for protecting plumbing pipes from damage and corrosion. It includes guidelines for passing pipes through walls, under cinders, and more.
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