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Double-Wall Piping Test <br /> • Pressure Test with Nitrogen to 5psi <br /> • Use Pressure Gauges (0-15psi) with 0.5psi increments. <br /> • Hold for 1 hour <br /> • Any drop in pressure = FAIL. <br /> • This test method is described by PEI RP-1200 (Section 5) <br /> • Tanknology Protocol: Use Redundant Gauges <br /> • Or follow AHJ or MFG procedures for times and thresholds <br /> s <br /> i ? <br /> Al <br />