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SECTION 8 <br /> SMITH <br /> TESTING RECOMMENDATIONS FOR <br /> SECONDARY CONTAINMENT PIPING <br /> Secondary containment piping, 3" to introduce air for the contain- <br /> and 4" (76 and 102 mm) diameter ment piping pressure test is at the <br /> 10 psig sizes, can be pressure tested by threaded outlet located on the <br /> /.069 MPa installingan in-line tee with a pres- concentric termination fitting near <br /> O sure gauge and a nipple in the 3/4" the underground storage tank(See <br /> threaded outlet of a termination Figure 2.8.1). It is advantageous to <br /> fitting(See Figure 2.8.1). If the test leave the system pressurized until <br /> piping is to be installed temporar- the installation is completed in <br /> ily, use care not to overtighten order to monitor for possible <br /> when installing the steel pipe damage to the containment piping <br /> threads. Fiberglass threads may be system during additional construc- <br /> damaged when removing the steel tion. The low pressure and low <br /> threads if overtightened. Use soft- volume of the secondary con- <br /> set nonmetallic thread dope only. tainment piping system makes this <br /> Smith Fiberglass Products recom- air test a safe procedure if normal <br /> mends testing 3" and 4" (76 and safety precautions are followed. <br /> 102 mm) secondary containment Note:6"(152 mm)secondary con- <br /> piping systems with air at pres- tainment piping is not UL Listed, <br /> sures not to exceed 10 psig (.069 but may be air tested when normal <br /> Figure 2.8.1 MPa). The most convenient place safety precautions are followed. <br /> 33 <br />