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I Optional Tank • Compression Rings Trench Oro monitor the cavity between Accessories For liners (flexible membrane or the primary and secondary Secondary Containment fiberglass trenching) can be pipe, a "T fitting with a moni- Piping Systems surface-mounted to the stan- toring port to grade should be dard double-wall tank manways installed. Multiple secondary using steel compression rings. containment couplings can 1 be manifolded together and Fiberglas®Attachment Rings— monitored by one sensor. If tank entry is required, a Fiberglas (FRP)Attachment Compression Rings Ring can be used to connect An optional steel compres- any of the secondary contain- sion ring is available to con- ment piping systems to the top nect a piping trench liner of the double-wall tank. (flexible membrane of fiber- glass trench)to the tank Secondary Containment Collar manway cover. Trench liners —For secondary containment are used as secondary con- of a submersible pump and tainment for piping leaks that piping, an optional containment may occur; the trench liner collar(and related monitoring directs the leaking fluid to the There are two types of sec- equipment) is available from tank manway area where it can ondary containment options O/C TANKS Corporation. be collected and detected. for underground piping: Secondary Containment The compression ring is con- e Trench liners—A flexible mem- Coupling structed of 1/4" epoxy-coated brane of fiberglass reinforced A 6" NPT secondary coupling steel with bolt holes in a bolt plastic trenching material is is concentrically positioned circle diameter to surface- used to line the piping trenches around the 4" NPT primary mount the trench liner to the from the dispenser to the tank. tank fitting. The secondary manway cover on 22" 30" or The piping inside the trench- containment coupling is 36" diameter manways. ing material is conventional surface-mounted on the tank single-wall construction. and does not penetrate the Special "T-nuts" embedded i outer wall or the double-wall in the bottom of the manway Double-wall piping The tank. There is no access to flange allow the bolts to be (S ! primary pipe (typically 2" the tank annular space at the tightened to secure the com- �G diameter) is installed inside 6" secondary containment pression ring. another pipe (typically 3" coupling. diameter). Special fittings and hardware are used to connect the outer pipe Secondary z_ lengths together. Containment s-NPT Tw Mwmee Coupling link FftN Pinery FRP Pipe O/C TANKS does not manu- °" $e aOaryRPPP' r , facture or distribute any sec- ondary containment systems for piping. However, optional accessories to connect sec- ondary containment systems for piping to the double-wall tanks are available from compression DETAIL OPTIONAL STEEL. O/C TANKS. ping COMPRESSION RING O/C TANKS recommends continuous electronic monitoring to warn the tank operator of PIPE an excessive accumulation of TRENCH LINER petroleum product within the piping secondary containment BOLT System. OPTIONAL STEEL COMPRESSION RING CAULK(CONTRACTOR SUPPLIED) Secondary Containment Coupling—When double-wall STEEL MAN WAV DOVER piping is used to secondarily T-NUT(SUPPLIED WITH MANWAY) CORK GASKET contain tank-mounted fittings, DETAIL A FIBERGLASS MANWAY the outer wall of the double- wall pipe is attached to the tank using a 6" NPT second- ary containment coupling.