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III, TEST PIPING SYSTEM THOROUGHLY BEFORE BACK FILLING <br /> A, TEST SCHEDULE 40 BLACK IRON PIPE AT 50 PSI AIR PRESSURE FOR 2 HOURS <br /> AND SOAP ALL CONNECTIONS <br /> B, TEST FRP PIPE AT 10 PSI AIR PRESSURE FOR TWO HOURS AND SOAP ALL <br /> CONNECTIONS ( DO NOT EXCEED IO PSI ) <br />