All properly arranged plumbing ordinances now demand that two tests shall be applied to each newly constructed plumbing system-one when the roughing has been completed, and the other when the entire plumbing system has been completed and is ready for use. No drainage pipe, vent pipe, or fitting should be concealed in partitions or between floors or buried underground until after the first test has been applied and the work inspected by the proper official.
Plate XXV. Testing Of The Plumbing System - The Water, Air, Smoke, And Peppermint Tests
Testing of Plate 25.
These tests are for the purpose of ensuring correct work, free from defects arising in construction and manufacture. There are four different methods of testing the plumbing system - the water test, air test, peppermint test, and smoke test. Of these, the water, peppermint, and smoke tests are most commonly used.
The water and air tests are chiefly used as the first test on new work. When it comes to the final test, either the peppermint or smoke test may be applied. Each is thorough when properly applied.
The question as to which is the better test is open to debate, each test having certain advantages and possible disadvantages.
Before the final test is applied, all fixtures should be in position and the system entirely complete, and the traps filled with water.
On old work in residences and other finished and occupied buildings, the water test cannot be applied, owing to the damage that might result. Under these conditions, either the peppermint or smoke test should be used. The testing of old work should be done much oftener than it is, as it is of much value, not only in showing defects in joints and the material for piping and connections, but also in disclosing by-passes and other wrong connections, stoppages, the loss of trap seals, the absence of traps on rain leaders and drains, etc.