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11 <br />i , �, • j <br />�.Ma. <br />Flexible <br />r�rkac or <br />10 veig <br />.oss We <br />2.8.1 <br />Secondary containment piping, 3" <br />and 4" (75 and 100mm) diameter <br />sizes, can be pressure tested by in- <br />stalling an in-line tee with a pressure <br />gauge and a nipple in the 3/4" <br />threaded outlet of a termination fit- <br />ting (See Figure 2.8.1). If the test <br />piping is to be installed temporarily, <br />use care not to overtighten when <br />installing the steel pipe threads. Fi- <br />berglass threads may be damaged <br />when removing the steel threads if <br />over tightened. Use soft -set nonme- <br />tallic thread dope only. <br />Smith Fiberglass Products recom- <br />mends testing 3" and 4" (75 and 100 <br />mm) secondary containment piping <br />systems with air at pressures not to <br />exceed 10 psig (.069 MPa). The most <br />36 <br />>FI IERCLASS y }' <br />convenient place to introduce air for <br />the containment piping pressure test <br />is at the threaded outlet located on <br />thetermination fitting near the under- <br />ground storage tank (See Figure 2.8.1). <br />It is advantageous to leave the system <br />pressurized until the installation is <br />completed in order to monitor for <br />possible damage to the containment <br />piping system during additional con- <br />struction. The low pressure and low <br />volume of the secondary contain- <br />ment piping system makes this air test <br />a safe procedure if normal safety pre- <br />cautions are followed. <br />Note: 6" (150mm) secondary con- <br />tainment piping is not UL Listed, but <br />may be air tested when normal safety <br />precautions are followed. <br />D <br />