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Total Containment markets hi.i quality environmental protection products for your secondary containment needs Bulkhead Fittings Dspenser Sumps and Pans P Gyuld-n9ht Tank Sumps Double-WallUntlerground Storage Tanks Guide Specifications Short Form Structural Integrity: The outer secondary contain- The contractor shall provide the Enviroflex®Double-Wall ment system shall be of such design and materials to piping system, as manufactured by Total Containment, have sufficient strength to withstand the maximum Inc.Both the primary and secondary piping systems shall underground burial loads and tested in accordance be installed and integrity tested in accordance with the with AASHTO M294. The flexible inner primary pip- manufacturer's published installation instructions. ing system shall be capable of withstanding liquid pressure five times greater than the designed operat- ing pressures. Design:The Double-Wall Piping System shall consist of Integrity Testing: The outer secondary containment a UL/ULC listed flexible inner primary pipe contained systems shall undergo an air pressure hold test (3 to within a ULC listed flexible outer containment pipe,each 5 psi) after installation and before the final backfill. making connection within a series of surface access The flexible inner primary piping system shall be sub- containment chambers. All piping runs shall be continu- ject to 60 psi air pressure hold test prior to final back- ous, whereby there shall be no fittings or piping con- fill. nections, for either the primary or secondary contain- Monitoring Capability: The design of the secondary ment pipe which are not visible or accessible from containment system shall permit any leak in the prl- aboveground. The secondary containment piping shall mart' piping system to be detected by a leak detaction be sized to allow complete removal of the primary piping system. without excavation. The secondary containment system Access Chambers: Surface access containment shall provide watertight containment of the tank's piping chambers shall be located at the tank containing the and its associated fittings, and the shear valve assembly tank's submersible pump and under each above- located below each aboveground fuel dispenser unit. ground fuel dispenser. These access chambers shall Product Compatibility: All the components of the meet the following requirements: Double-Wall Piping System shall be compatible with the 1. Provide product-tight tank or island connection. products to be stored. 2. Provide product-tight pipe and conduit exits. Corrosion Resistance: All components of the Double- 3. Provide sufficient strength to keep out Wall Piping System shall be made of non-corrosive surrounding backfill material. materials, or if metallic, such as the fittings and cou- 4. Made of non-corrosive, product compaai-)le and plings, isolated from corrosion causing agents. dielectric materials. 1�