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• I-] • SECTION 8 ♦ Testing Recommendations for Secondary Containment Piping FIGURE 2.7.2 Curing saddles—Curing saddles can be accomplished by wrapping a heating collar over the saddle outlet as shown in Fig. 2.7.2. For outdoor installations, place wind shields on both sides of the saddle to prevent heat loss. Total cure time must be two hours for sad- dles. Allow the saddle to cure and cool down to ambi- ent temperature before bonding or threading in the side run. Do not use chemical heat packs to cure sad- dles. SECTION 8 • TESTING RECOMMENDATIONS FOR SEC- ONDARY CONTAINMENT PIPING Secondary containment piping, 3" and 4" (75 mm and 100 mm) diameter sizes, can be pressure tested by installing an in-line tee with a pressure gauge and a nipple in the Y" threaded outlet of a termination fitting (see Fig. 2.8.1). If the test piping is to be installed temporarily, use care not to over tighten when installing the steel pipe threads. Fiberglass threads may be damaged when removing the RED THREAD IIA Pipe Sr Fittings Flexible Connector FIGURE 2.8.1 steel threads if over tightened. Use soft -set, non-metallic thread dope only. Smith Fiberglass Products recommends testing 3" and 4" (75 mm and 100 mm) secondary containment piping sys- tems with air at pressures not to exceed 10 psig (0.069 MPa). The most convenient place to introduce air for the containment piping pressure test is at the threaded outlet located on the termination fitting near the underground storage tank (see Fig. 2.8.1). It is advantageous to leave the system pressurized until the installation is completed in order to monitor for possible damage to the contain- ment piping system during additional construction. The low pressure and low volume of the secondary contain- ment piping system makes this air test a safe procedure if normal safety precautions are followed. Note: 6" (150 mm) secondary containment piping is not UL Listed, but may be air tested when normal safety pre- cautions are followed. 29