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Made To-Ordef • Made-To-Order Tank Notes Double-Wall Tanks 1.The location of additional and/or modified tank acces- sories should be referenced by the numbered fitting position between ribs. 2. Fittings cannot be installed in locations marked with an asterisk ('). 3. Standard pipe fittings to the primary tank are 4" NPT half couplings. All tanks require at least one manway. The manway cover should include at least one fitting. 4. Specifying more or larger manways than the standard Additional Made To- Monitoring capabilities— double-wall tank may alter Order Double-Wall the following restrictions apply the anchoring strap locations. Tanks with Suggested for the various types of double- The standard anchoring Fitting Locations wall tank monitors: strap locations are indicated by arrows. Although the standard double- a) Hydrostatic Tank Monitor— wall tanks are designed to tank burial depth must not 5. All additional manway accommodate storage app wall exceed 7 from tank top to covers should include at cations, most tanks can be finish grade. least one fitting to facilitate modified to include larger or future volumetric precision additional manways or tank- The monitoring cavity must be tank testing. mounted fittings or other vented to the atmosphere. The optional reservoir sensor, sup- 6. Tank bottom deflector plates double-wall tank accessories. ,1 plied by O/C TANKS, is also are standard under every Modified standard tanks accessories. Jl made-to-order tanks require designed to automatically vent manway and fitting. additional lead time for the monitoring cavity. production. 7. All Model "P" tanks b) Liquid sensors—when include a Fiberglas reser- The made-to-order tanks are cavity monitors which voir integrally constructed to shown with manways and detect the presence of a the tank top at the locations tank-mounted fittings in the liquid are used, the cavity noted in the standard tank suggested positions. between the inner and drawings. The reservoir outer tank may be either includes one 4 NPT half vented to the atmosphere coupling fitting (6" NPT fit- or sealed. ting for 10' diameter tanks) mounted on the top of the c) Vacuum monitoring—when reservoir allowing access to vacuum monitoring is used, the cavity between the inner the maximum vacuum is 3" and outer tank walls. mercury (1.5 psi maximum). Tank burial depth must not 6. In addition to the monitor- exceed three feet. ing fitting located in the Fiberglas reservoir, tanks d) Positive air pressure—when 4000 gallon capacity and positive air pressure moni- larger include one addi- toring is used,the maximum tional monitoring fitting air pressure is 3 psi. (4" NPT) located at the tank top near the manway. e) Gasoline vapor sensors— when gasoline vapor sensors are used, the cavity between the inner and outer tank may be either vented to the atmosphere or sealed.