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plastic tubes assemblies are designed to provide convenient access to the beginning and end of a double wall pipe line for initial and periodic air pressure integrity testing. 16.1.1 Coax Test Tubes These 3/8" tubes are 36" long (914mm) with a 1/4" female fitting installed on one end. The other end has a nylon male 1/4" NPT threaded connection which connects to the 1/4" NPT threaded test port of the coax pipe adapter. CAUTION: Do not install metallic fittings into Coax test ports. 16.1.2 Standard Test Tubes These 3/8" tubes are 36" long (914mm) with a 1/4" female brass fitting installed on one end. The other end has a male barbed elbow with band clamp attached for connection to the 3/8" port of the rubber test boot used with metallic couplings & fittings. 16.2 Connector Tubes These short plastic tube assemblies connect one test boot to another to reroute the interstitial space of one flexible pipe section around a tee or connector fitting to the next flexible pipe section. 16.2.1 Connected Connector Tubes After initial integrity testing has been completed, the connector tubes can remain connected if interstitial product flow is desired to run the length of the pipe line back to the tank sump. NOTE: Dispenser sump leak detection is required to monitor the integrity of piping, when the connector tubes are connected. 16.2.2 Disconnected Connector Tubes After initial integrity testing has been completed, the connector tubes can be disconnected if interstitial product flow is desired from sump to sump. One end in each dispenser sump should be disconnected from the test boot. 17.0 VENT FLEXIBLE VENT PIPING This flexible piping is used for the transmission of aromatic fuel vapors and is designed for direct burial of the pipe and fittings without the requirement for secondary containment. The intended use for Vent is for venting vapors from an underground storage tank to a remotely located vent stack. IMPORTANT: Vent is available in both 2" and 3" sizes and is not intended for the transfer of fluids. 17.1 Vent Connections The Vent piping system requires the use of swivel couplings & fittings. Unlike supply piping connections OPW-FCS permits Vent swivel connections to be direct buried when properly protected. 17.2 Tank Connections Within Tank Sump If the tank's vent connection is con-tained within a tank sump, the vent line should enter through a flexible entry boot. A male or female adapter fitting should be used to complete the connection within. ih: F/eacWOR KS BY OPW FUELING CONTAINMENT SYSTEMS 17.3 Tank Connections Extractor Fitting If the tank's vent connection is not contained within a tank sump, then a male or female adapter fitting should be installed in the extractor fitting to accept the OPW- FCS Piping. The adapter and coupling/fitting should be properly protected. 17.4 Pipe Branch Connections In between the beginning and end of a Vent piping line it may be necessary to install tee fittings to interconnect numerous pipe runs into a main return line to the tank. For this application the coax junction tee or coax branch tee may be used. 17.5 Vent Stack Connections At the other end of a Vent' pipe line the pipe connects to a vent stack for tank vapor venting applications. This connection is made using an elbow fitted to the appropriate coupling. Metallic fittings may be wrapped with pipe tape to further protect the fitting components from corrosion. 18.0 TESTING & FILLING SUPPLY PIPE It is important to properly test the flexible piping prior to backfill to insure there are no leaks. The following test procedures are provided as a guideline only and the manufacturer assumes no responsibility or liability for the consequences of any testing practices. IMPORTANT. Integrity testing with air or gas can be dangerous and it is very important that the proper testing equipment be used and that the pre -testing procedures be read. 18.1 Testing Equipment • Pressurizing equipment should be of sufficient size to accommodate line pressure testing requirements. • Pressurizing equipment should have controls to gradually increase pressures. • Pressurizing equipment should be operated by experienced and qualified personnel only. • The pressure gauge should be located in close proximity to the pressurizing equipment. • Pressure gauges must have a full scale reading not to exceed twice the required test pressure. • Pressure gauges should be accurately and routinely tested for reliability. 18.2 Pre -Testing Procedures • The underground storage tank should be isolated from the piping system prior to hydrostatic or air testing. • Shear valves located under dispensers should be sealed with pressure rated plugs or caps. • Long flex piping runs should be secured at various points with backfill material. • All pipe coupling/swivel connections should be tightened securely before testing. • The interstitial (secondary) line should be interconnected and fitted with an air gauge. • All local building, safety and fire codes should be followed prior to and during testing.