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Containment By Design > The Owens-Corning Double-Wall Tank Engineered For Maximum Safety. Tanksection view at ■Quality Assurance At The Jobsite. Owens-Corning Fiberglas°tanks have a reputation for contain- -'"' The tank is shipped with resilient bumper pads attached to both merit.They have been proven in 100,000 installations over the pastmatTlel ends of the tank.This protective packaging protects the outer wall 20 years and have become the best selling tanks on and under— C e from in transit damage and accidental handling abuse at the the earth! lobate. omeindusMes,municipalities,counties and states arenow For adtled quality assurance.alOwens-0orning OoublaWall pedying syaems of Secontlary containment far maximum prdec- Tanks are factory shipped with.continuous vacuum on the tank tion of their natural underground water supplies against petroleum cavity between the inner and outer tank.This seal volt remain intact contamination. •' -"' v - until the tank is as tested by the contractor. Atter extensive development and testing,Owens-0ornce hasLid Model a Comiwous engineered an integrated tlouWe-waltank for assurance vacuum 4-8 petroleum containment in critical installations. ■Not Just Another Tank Within A Tank. ET. r Gauge The OwerarCorning double-wall tank(model DWT 2P)featuresManwar. aes,rem Optional special high strength fiberglass interna ribs between the inner and Lid r a dumper outer walls.These ribs form a unique structural sandwich conshuc- pay bon which results in excellent inner and outer wall stability under theween alls �f following external load conditiore:Externa hydrostatic pressure ■Monitoring Flexibility. Inner (groundwater az o grade a Tbunal depth),H2O axle surface loading, Thereare many tank monitoring systems available commercially— internallexternal hydrostatic lowone designed to fit every taste and pocketbook.The DWT-2P tank pressure of 6.5 psi m is designed to accommodate a variety of monitoring systems.The ins cavity between rrr Selection of the monitoring system and method is me responsibility theinnerand n of the tank owner andlor operator. outer ;r r r 1.Hydrostatic pressure monitor—the primary function of a tank mak'100 C C, monitor is to detect a breaohin the inner or outer tank under all 120 t installed circumstances.Only pressure type monitors will fulfill this r criteria.Owens-Corning recommends and supplies an optional 20000 hydrostatic tank monitor,which continuously monitors both the inner and outer wall of the double-wall tank.(See CCF publication No.&PE-12707 for dwails.) The hydrostatic ank monitor is available with an optional electronic 1360*Monitoring. Side Elevationcontrol panel from Owens Corning.The hydrostatic tank monitoring ull3600double-wall protection is provided over the entire tank y system is also compatible with other canmerosly available elec all wail and endcaps.In the unlikely event of a breach at any point r Ironic control panel systems. inthe ing the lengor th of nk thewfink—arengin free flowow of liquinels—d I 2.Air pressurelvacuum systems—OwensCorningtanksarecom- runningthelength dthetank—assureafree fiowoflinkwall.leak gabble with continuous air pressure type monitors: sensor(cwtation Limited the innerandouter tank walls. a.Positive air Pressure(maximum 6"mercury or ps) ■Penetrationsr newd uTo The Manwey. b.Vacuum(maximum 3"mercury or 1 vx psi) We've anwaytlouris wy,peelnitiowall tank thetann III ttings mounted a 3.Gasoline or Liquid Sensors—The clearance in the monitoring c the manways.leak emini minimized. ns in thetankwal,wnidt " LI I I cavity provides ample room to accommodate most comme¢ially could potentially leak,are minimizetl. I J I I available gasoline and liquid sensors.The monitoring cavity can be Tanks with 4000 gallon capacity and larger have 2 manways.one I sealed or vented to the atmosphere. located at each end of the tank.Three 4"NPT brings mounted in I ■ANote About Rust. at tthe he standard tan manway(far atota of sx filings)areinduded en I I Doublewal banks have four surfaces.With steel tanks the inside Standard tanks k. tl I II and outside of the outer tank and themside and outside of the inner wa with tanks amour 4"than mounted he manamarn \I tank can be attacked by real.Special coatings or cathodic proteo -way with a ictal of four 4"NOT fittings mounted in the manway lid. bon of the exterior of a steel tank is not enough.Thethree Additional fittings and larger size manways are optional. unprotected surfaces made are still exposed to rust caused by water(condensation)and dipstick abrasion.The answer is Fiberglas double wall tanks which cannot rust.