Section 30. Tight Joints. All joints shall be made air and water tight and shall stand the tests for tightness specified in this act.

Section 32. Special Traps, etc. Every building from which in the opinion of the superintendent of sewers, grease may be discharged in such quantity as to clog or injure the sewer shall have a special grease trap satisfactory to the superintendent of sewers. Every building in which gasoline, naphtha or other inflammable compounds are used for business purposes shall be provided with a special trap, satisfactory to the superintendent of sewers, so designed as to prevent the passage of such material into the sewer and ventilated with a separate pipe rising to a point four feet above the roof.

The waste pipe from the sink of every hotel, eating house, restaurant or other public cooking establishment, shall be connected to a grease trap of sufficient size, easily accessible to open and clean, placed as near as practicable to the fixture that it serves.

Section 33. Arrangement of Piping. All piping shall be as straight and direct as possible, and so arranged that it may be readily inspected, cleaned and repaired. If any part of a house drainage or plumbing system is so located or so constructed that obstructions therein cannot be removed without breaking pipes, such part shall be provided with proper accessible clean-outs. No trap shall be so placed as to be inaccessible.

Section 34. Inspection and Tests. All new piping shall be given two tests by the plumber in charge; first the roughing in with five pound air test, second and final with peppermint or smoke and in the presence of the inspector or authorized deputy. The material and labor for the tests shall be furnished by the plumber.

No drainage or plumbing system, or part thereof, shall be covered until it has been inspected as herein prescribed.

When a plumbing or drainage system is completed and the water turned on and the traps filled, it shall be inspected and given the final test. When the location or style of any fixture is changed it shall be inspected.

Section 37. Peppermint Test. Where the peppermint test is used for the final test, two ounces of oil of peppermint must be provided for each stack up to five stories and basement in height, and for each additional five stories or fraction thereof one additional ounce must be provided for each stack.

Section 38. Smoke Test. The drainage system of all new buildings shall be given their final test with smoke by a proper smoke machine. After the whole system is completely filled with dense pungent smoke, an air pressure equivalent to one inch water column shall be applied and left standing at least ten minutes. If there is no leakage or forcing of trap seals, the system shall be deemed air or gas tight.

Section 39. Notification of Inspector. The plumber shall notify the Inspector in writing when the work is ready for inspection. The application for the final inspection shall be made within ten days after the completion of the work.

Section 40. Defective Work. If tests show defects the defective work or material shall be replaced and the test again applied.


One of the greatest wastes in the present complicated plumbing system is in the extra thickness of cast iron piping necessitated by the fracturing strain on the hubs caused by the process of hand caulking with lead of the bell and spigot joint, called for in most plumbing laws, as well as by the rigidity of the joints themselves.

A scientific flexible joint would enable pipes of

"standard" thickness to be used where now "extra heavy" are required to stand these strains on the joints. This about doubles the weight and cost of the cast iron piping.

"Standard" pipe is amply strong enough to stand the strains of shrinkage and settlement of the building materials even in new work provided flexible joints are used to take up these strains, as already described in our chapter treating of flexible joints, and it is amply thick enough; so far as rusting is concerned, to outlast the life of any building in which it is used. Therefore the public are sustaining a very heavy and unnecessary burden on account of the failure of plumbing legislation to recognize these modern improvements in jointing.

The brass piping now required is also far heavier than is necessary. Flexibility in the brass piping is obtained by arranging the piping in the manner practiced by steam fitters, angles and elbows taking up the play in places where the elasticity of the pipe itself is considered insufficient.

Taken in connection with the other items of saving we have referred to in this treatise, including the omission of the main house trap and of the back venting of traps, etc., our simple system of plumbing costs less than half as much as the complicated system in vogue and provides far greater convenience and security.