Leak Protection for Underground Suction Pipes

Underground Pipe Leaks No leak detection is required if the suction piping has:
enough slope so that product in the pipe can drain back into the tank when suction is released, and
has only one check valve which is located as close as possible beneath the pump in the dispensing unit.

If a suction line is to be considered exempt on the basis of these design elements, there must be some way to check that the line was actually installed according to these plans.

If a suction line does not meet both design criteria stated above, one of the following leak detection methods must be used:
Line Tightness Test at least every 3 years, or
monthly Vapor Monitoring, or
monthly Ground Water Monitoring, or
monthly Interstitial Monitoring

The line tightness test must be able to detect a leak at least as small as 0.1 gallon per hour. Ground water, vapor, and interstitial monitoring have the same regulatory requirements for piping as for tanks.

Back ArrowReturn to Piping Menu © Copyright