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