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i <br />J/,IJ 17 2017 <br />ENVIRONMENTAL HEALTH <br />E.=7!�,?TMENT <br />Primary system testing <br />Plan tests carefully and carry them out with all due precau- <br />tions. Pressurizing equipment should be suited to the size of <br />the system and the pressure required and should be operated <br />by qualified and experienced personnel only. <br />• Pressure sources should be capable of approaching test <br />pressure gradually. <br />• Use gauges with a full-scale reading of no more than <br />twice the test pressure. Do not use a 100 psi (0.69 MPa) <br />gauge for a 10 psi (0.069 MPa) test. Use reliable gauges <br />calibrated against a dead weight tester and zeroed for <br />atmospheric pressure. <br />• Isolate tanks from the piping when pressure testing. <br />• The recommended hydrostatic pressure is 150% of ex- <br />pected <br />xpected operating pressure and should be maintained at <br />least 1 hour. <br />• Do not exceed 150% of system rating. Check the pres- <br />sure rating of all the components of the system, not just <br />the pipe, because hoses and flexible connectors are al- <br />most always rated lower than the pipe. <br />• Do not adjust fittings while system is under pressure. If <br />threaded adapters or bushings leak, release the pressure <br />before attempting to tighten. <br />• Temperature changes can affect the pressure in the test <br />line. Substantial pressure increases may occur in closed <br />systems exposed to the sun. Conversely, overnight de- <br />creases in pressure due to cooling from afternoon to <br />early morning are normal and do not necessarily indicate <br />a leak. <br />• After testing, maintain 5 to 10 psi (0.035 to 0.069 MPa) in <br />the system during subsequent construction so that dam- <br />age caused by stakes or excavation equipment can be <br />detected and corrected before pavement is installed or <br />product is pumped. <br />Pneumatic testing of Dualoy 3000/LCX <br />• Plan tests carefully and carry them out with all due pre- <br />cautions. Pressurizing equipment should be suited to the <br />size of the system and the pressure required and should <br />be operated by qualified and experienced personnel <br />only. Pressure sources should be capable of approach- <br />ing test pressure gradually. <br />72 <br />