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GLOSSARY Access opening On a water or wastewatertank, an access opening is a non -flanged, non -bolted opening designed to provide personnel access to the interior of the tank. Baffle On a water or wastewatertank, a baffle is a partition wall that may extend the full tank height. Base Tank On a multicompartment fuel tank, a base tank is the compartment with two convex domed endcaps that serve as bulkheads to another compartment. Containment sumps A containment sump is a single-wall or double-wall enclosure to be installed above underground storage tanks. It is used as a termination point for piping and tank access openings. Double-wall (DW) tank A double-wall tank is a tank with a primary (inner) wall surrounded by a secondary (outer) wall, with a monitorable space between the primary wall and the secondary wall. Dry monitor fitting On a dry -monitored double-wall tank, a dry monitor fitting is the accessory that provides access to the interstitial space. End compartment On a multicompartment fuel tank, an end compartment is the compartment with one convex and one concave domed endcap. Flat Flat is a common term used to described the area between the ribs on the outside of the tank. Green Tank A greer tank is a tank manufactured in Canada. Interstitial space Also referred to as "interstice" or "annular space;' an interstitial space is the region between any two walls of a tank or tank accessory. 02 Manway A manway is the flanged fiberglass opening (typically 22 -inch, 30 -inch or 36 -inch in diameter) that provides access to the primary tank and/or is used for multiple service fittings that are welded to a bolt -on steel manway cover. Monitor fitting On a double-wall tank, a monitorfitting is the accessory that provides access to the interstitial space. Monitoring fluid Also referred to as "brine," on a hydrostatically monitored double-wall tank, monitoring fluid is the fluid that is added to interstitial space.The monitoring fluid thatwe commonly use is an approximately 30% calcium chloride solution that is dyed blue to help differentiate it from other fluids. Pressure relief valve A pressure relief valve is the valve that automatically opens at a set pressure to relieve pressure if it rises above the set point. Pressure testing Pressure testing is the use of air or inert gas pressure and soapy water solution to create soap bubbles as an indica- tion of a problem with the tank. Primary backfill Primary backfill is rounded or crushed stone conforming to the requirements listed in Appendix C. Primary tank A primary tank is the inner tank (product storage tank) of a multiple -wall tank. Red Tank A red tank is a tank manufactured in the United States. Reservoir On a hydrostatically monitored double-wall tank, a reservoir is the small expansion chamber at the top of the tank used for monitoring the fluid level in the interstitial space. Rib A rib is the fiberglass reinforcement integrally manufac- tured around the circumference of the tank and evenly spaced along the length of the tank. Secondary backfill Secondary backfill is the granular material conforming to the requirements listed in section 1 that may be used as an alternative to primary backfill above the tank in some conditions. Secondary tank A secondary tank is the second wall of a multiple -wall tank. For a double-wall tank, this wall of the tank is visible from the exterior. Single-wall (SW) tank A single-wall tank is a tank having only one wall separating its contents from the external environment. Test manifold Atest manifold is an assembly of components including pipe fittings, nipples, valves, hose, pressure gauges and a pressure relief valve, used for controlling and monitoring pressure during a pressure test. TRUCHEKe TRUCHEK® is our patented hydrostatic, tank -monitoring sys- tem for double-wall tanks. It is an easy, reliable method for true continuous leak detection and tank -tightness testing. Torque rating Torque rating is the maximum allowable rotational load thatcan be applied to tighten threads.The bolttorque rating of flanged fiberglass fittings and manways on our tanks is 25 foot-pounds. Unattached riser An unattached riser is a chamber with an open bottom above the tank, with no attachment to the tank. FUEL TANK Manway Monitor Fitting Reservoir End CompartmentBase Tank End Compartment i i Rib Flat WATER TANK Access Opening Baffle