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1 <br /> Containment • <br /> Optional tank accessories for secondary containment systems. <br /> Fiberglass Secondary Containment Collar <br /> An optional secondary containment collar provides a containment area <br /> for spilled liquids,as well as a location for the leak-monitoring sensor. <br /> Collars can be installed around other tank fittings and accessories, <br /> where space permits. Collars are constructed of fiberglass and are <br /> available in 42"diameter(with 22'manways)and 48'diameter(with 22" <br /> and 30'manways) sizes. <br /> The secondary containment collar is integrally attached to the tank top ary a <br /> to provide a watertight seal. The collar is factory installed and tested <br /> prior to shipment. Another collar leak test should be performed at the <br /> jobsite by the installing contractor. See CSI installation instructions for details. The secondary containment <br /> collar must periodically be tested for leaks—at least once each year or after collar maintenance is performed <br /> — by adding water to the collar above the tank top. The secondary containment collar must be continuously <br /> ax <br /> monitored with an electronic sensor for potential spills or piping leaks. <br /> - a <br /> Secondary Containment Fitting <br /> A 6", FRP threaded secondary coupling is concentrically positioned <br /> ' around the 4" NPT primary tank fitting. The secondary containment <br /> coupling is surface-mounted onto the tank and does not penetrate the <br /> outer wall. There is no access to the tank annular space at the 6" <br /> secondary containment coupling. To directly monitor the cavity <br /> between the primary and secondary pipe, a fitting with an access port <br /> should be installed. <br />