Air-Chambers

No cock to be placed at the end of a line of pipe, but the supply-pipe to be extended so as to provide an air-chamber in each case. (See Figure 146.)

Traps

All traps for fixtures to be arranged so as to be easily accessible.

Back-Air Pipes

Every trap under fixtures to be provided with a ventilating-pipe taken from just beyond crown of trap to prevent syphonage, and secure a circulation of air through the branch-pipes, as hereinafter provided for. Water-closet traps to have 2-inch lead vent-pipes, and all other traps to have vents of same area as the trap, except when vent-pipe docs not require to exceed twenty feet in length to reach a point above the roof. No vent-pipe to be smaller than 1 1/4-inch. Each lead vent must connect with vertical pipe of not less than 2-inch external area, said vertical pipe to be placed alongside the nearest vertical soil or waste pipe. If back-air pipes are earned through the roof they must be enlarged to four inches to prevent clogging in winter time in colder latitudes.

Overflows

Overflow-pipes from basins, bath, and pantry-sink to be branched into dip of trap under the fixtures. , All soil, waste, vent, or supply pipes must be exposed to view or be cased in wood, fastened with screws, so that they are readily accessible.

No pipe or fitting shall be boxed in or otherwise hidden till it be passed upon by the architect or superintendent.

During construction all pipe ends must be covered to prevent the entrance of sticks or other materials that might cause obstructions.

The architect or superintendent may reject any pipe, fixture, appliance, or piece of work which, in his opinion, does not meet the requirements of this specification, and kis decision in all matters shall be regarded as final.

Figure 146 - Detail Of Branch Of Water-supply To Pantry And Kitchen Sinks.

The plumber must not do any cutting; this will be done for him, wherever necessary, by the carpenter.

The plumber shall do all his work promptly, as the progress of the building requires.

Plumber to furnish all materials and implements, and to perform all labor requisite to complete all the work in a workmanlike manner, according to the drawings and specifications, including any material or labor not specifically described or mentioned, but which are necessary for the proper carrying out of these specifications.

Where the specifications vary or conflict with the drawings the contractor to be governed by the specifications.

All the work to be tested after completion by turning the water on everywhere, and any defects found to be at once repaired and all left in perfect order.