All main, soil, waste or vent pipes must be cast iron, galvanized wrought iron, galvanized steel, brass or Type K or L copper tubing. Vent piping may be copper, Type DWV.
Necessary offsets above the highest fixture branch must not be made at an angle of less than 45° to the horizontal.
Soil and waste pipes must have proper Y- and TY-branches for all fixture connections.
No connections to lead branches for water closets or slop sinks will be permitted, except required branch vent.
Branch soil and waste pipe must have a fall of at least 1/4 inch per foot.
Short TY-branches will be permitted on vertical lines only. Long 1/4 bends and long TY's are permitted. Short 1/4 bends, double hubs, common offsets, bends and saddles are prohibited. At the foot of a stack where connection is made to drain, short one-quarter bends and short T's are prohibited.
A. 
The diameters of soil and waste pipes must not be less than those given in the following table:
Type of Pipe
Diameter
(inches)
Main soil stacks in buildings serving not more than 2 sets of fixtures in 4 or less stories
4
Main soil stacks in residence buildings serving not more than 2 sets of fixtures in 5 or 6 stories
4
Main soil stacks in all other cases
3
Branch soil pipes for not more than 4 water closets
4
Main waste stacks
2
Main waste stacks for kitchen sinks on 6 or more floors
3
Branch waste pipes for slop sinks
3
Branch waste pipes for laundry tubs
1 1/2
When set in ranges of 3
2
Branch waste for icebox sinks
2
Branch waste for showers
2
Branch waste for kitchen sinks
2
Branch waste for urinals
2
Branch waste for other fixtures
1 1/2
B. 
A set of fixtures, as used in this section, shall include not more than one water closet, one bathtub, one washbasin, one sink and two laundry trays.
The diameter of all riser lines in plumbing systems shall be not less than 3/4 inch where there is more than one fixture on the second floor.
Separate stopcocks or valves, so located as to be accessible at all times, shall be placed at the foot of each riser and in all buildings other than residence buildings occupied exclusively by one or two families or having not more than 15 sleeping rooms, on each branch line from the riser for each isolated fixture or each group of fixtures, such as bathroom fixtures, kitchen fixtures, etc.; except that only one stopcock or valve shall be required for the fixtures contained in any one apartment, suite, store or loft occupied by one tenant when all the fixtures contained in each such apartment, suite, store or loft are supplied from one branch line.
Diameters of branches to any fixtures must not be less than 1/2 inch except when used to supply water closets, cisterns or lavatories. When the material used is lead, brass or copper pipe, the minimum diameter may be 3/8 inch. Branches for flush valves for water closets must not be less than one inch in diameter, and for urinals, not less than 1/2 inch in diameter.
All risers and branches must be properly fastened.
A. 
Lines. Lines for acid wastes must be B lead pipes or earthen pipe; if of lead pipe, they must be at least two inches in diameter, and if of earthen pipe, at least three inches in diameter. They must be extended through the roof for ventilation and continued down to the lower story of the building and so arranged as to discharge into a lime box and diluting sink properly trapped and vented, connected inside the house trap. If the lime box and diluting sink are not used, the acid waste must be extended to an earthen house sewer or separately and independently connected to a public or private sewer in the street and provided with an accessible running trap located just inside of the front wall of buildings.
B. 
Branches, joints. All branches and joints on lead acid wastes must be made by means of burnt lead joints. If earthenware pipe is used, vertical joints must be made with a mixture of asphaltum and cement.
C. 
Supports. Each length of pipe on vertical runs and on horizontal runs when above the cellar floor must be supported at each hub by proper supports.
D. 
Drains, fixture connections. All floor drains and fixture connections must be trapped and run as direct as possible.
A. 
Use. When it is necessary to use a pump system and sewage lift to receive the discharge from the waste or soil connection to fixtures, same shall be arranged to be accessible. If discharged with compressed air, it shall be connected to the house drain on the sewer side of all leader or area drain traps and fixture connections or may be connected to the house drain on the sewer side of house trap.
B. 
Trap, inlet. A separate trap and fresh-air inlet must be provided on the inlet side of the sump up to and above the roof, for purposes of ventilation. Relief pipes must be provided on the sewage receptacle of sumps. Traps of fixtures connected with sump systems must not be vented to vent lines which are used to ventilate traps of fixtures on gravity system.
C. 
Connection to plumbing system. Sump systems should be entirely separate both as to discharge and venting from the rest of the plumbing system in buildings.