After the test has been applied and approved by the Inspector,
cast-iron drain, soil, waste and vent pipes may be coated, but in
no case shall any coating be applied to cast-iron pipe for drainage
until the test has been applied and approved.
The smallest inside diameter of trap and waste branch for a
given fixture shall not be less than that shown in the following table:
Kind of Fixture
|
Size of Trap and Branch
(inches)
|
---|
Bathtub with shower
|
1 1/2
|
Washbasin
|
1 1/4
|
Shower stalls
|
1 1/2
|
Drinking fountain
|
1 1/4
|
Floor drains
|
2
|
Laundry trays
|
1 1/2
|
Water closets
|
4
|
Sinks, kitchen
|
1 1/2
|
Sinks, large hotel or public
|
2
|
Sinks with dishwasher
|
1 1/2
|
Washing machines
|
1 1/2
|
Urinals, trough
|
2
|
Urinals, pedestal
|
3
|
Urinals, lip
|
1 1/2
|
In determining the number of fixture equivalents, the following
table shall be used:
Traps
(inches)
|
Fixture Units
|
---|
1 1/4
|
1
|
1 1/2
|
1 1/2
|
2
|
2
|
2 1/2
|
3
|
3
|
4
|
4
|
6
|
All offsets must be made at an angle of not less than 45°
to the horizontal, and all lines must be connected at the bottom with
a soil or waste pipe or the drain in such manner as to prevent the
accumulation of rust scale. Branch vents must be kept above the top
of all connecting fixtures to prevent the use of vent pipes as soil
pipes.
All materials shall be of good quality, free of defects, and
all work must be executed in a thorough, workmanlike manner.
All joints on cast-iron pipe shall be made with picked oakum
and molten lead, thoroughly caulked and made gastight. Twelve ounces
of soft pig lead shall be used for each joint for each inch in the
diameter of the pipe.
Lead bends and traps for water closets and slop hoppers shall
be not less than 1/8 inch in thickness. All other lead traps shall
conform in thickness to the lead waste pipe to which they are to be
attached. Lead bends and cast floor flanges for toilets may be used
subject to approval. The name of the manufacturer and the weight per
foot shall be stamped on each lead bend and trap.
Cast-brass ferrules and solder nipples shall be 1/8 inch in
thickness and of full diameter as specified. Brass pipes used for
solder nipples shall be iron-pipe gauge.
Steam or vapor condensation must pass through a condenser or
cooling tank of proper dimensions and then empty into an open water-supplied
fixture properly trapped, or may be connected directly.
All fixtures below the level of the sewer shall discharge into
a sump or receiving tank, made airtight and ventilated by extending
a vent pipe not less than four inches in diameter to a point at least
one foot above the roof of the building. All the contents of the said
sump or tank shall be lifted and discharged into the drainage system
by some approved method, or an improved ejector may be used to lift
the sewage to the drainage system.
Short quarter bends, double hubs and offsets less than an angle
of 45° to the horizontal are prohibited. No saddle hubs or fittings
shall be used inside buildings. Drillings and tappings are prohibited.
Drain connections to sewers shall be made with an approved saddle
Y or combination having bands, each of which is not less than one
inch in width. Saddle must be securely fastened with two bands and
cemented all around the sewer pipe. Care must be exercised in cutting
the hole in the main sewer pipe when such is necessary and the saddle
Y carefully fitted so that no rough edges shall protrude into the
inside of the opening.