After new water line has been laid and backfilled, but prior to replacement of pavement, fill each valved section of pipe slowly with water. Before commencing test, expel all air from line. If necessary, tap pipe at points of highest elevation to expel all air. On completion of tests, taps to be tightly plugged with brass fittings.
(Ordinance 2007-106, App. B, adopted 3/20/07)
Apply specified test pressure by means of pump connected to pipe. Provide means to measure or meter water pumped into the line to the nearest 0.1 gallon and a pressure gauge with a 6" minimum face and calibration marks at 1 psi intervals. At intervals during test, inspect route of pipe to locate any leaks or breaks.
(Ordinance 2007-106, App. B, adopted 3/20/07)
Remove and replace defective joints, cracks, or defective pipe or fittings. Should any test of sections of pipe disclose leakage greater than that specified, locate and repair defective joints or defective pipe until test proves that leakage is within specified allowance.
(Ordinance 2007-106, App. B, adopted 3/20/07)
Hydrostatic pressure test shall be at 150% of working pressure at point of test, but not less than 75% of the rated pressure of the pipe at the highest elevation of the segment being tested. Test pressure shall not exceed the rated pressure of the pipe at any time at any location on the segment being tested. Test pressure shall not vary ±5 pounds per square inch for the duration of the test. Duration of test shall be two (2) hours.
The maximum allowable leakage for a test section shall not exceed the amount determined from the following formula:
where “L” is the allowable leakage, in gallons per hour; “N” is the number of joints in the length of pipe tested (pipe and fittings); “D” is the nominal diameter of the pipe, in inches; and “P” is the average test pressure in pounds per square inch gauge.
(Ordinance 2007-106, App. B, adopted 3/20/07)