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11110P 0 Made -To -Order Double -Wall Tanks Additional Made -To - Order Double -Wall Tanks with Suggested Fitting Locations Although the standard double- wall tanks are designed to accommodate storage appli- cations, most tanks can be modified to include larger or additional manways or tank- rQounted fittings or other double-wall tank accessories. Modified standard tanks or made-to-order tanks require additional lead time for production. The made-to-order tanks are shown with manways and lank -mounted fittings in the suggested positions. R " O k, h1AY 0 3 2017 ENVIRONMENTAL HEALTH DEPARTMENT • Monitoring capabilities— the following restrictions apply for the various types of double- wall tank monitors: a) Hydrostatic Tank Monitor— tank burial depth must not exceed T from tank top to finish grade. The monitoring cavity must be vented to the atmosphere. The optional reservoir sensor, sup- plied by O/C TANKS, is also designed to automatically vent the monitoring cavity. b) Liquid sensors—when cavity monitors which detect the presence of a liquid are used, the cavity between the inner and outer tank may be either vented to the atmosphere or sealed. 0 Vacuum monitoring—when vacuum monitoring is used, the maximum vacuum is 3" mercury (IS psi maximum). Tank burial depth must not exceed three feet. d) Positive air pressure—when Positive air pressure moni. toring is used, the maximum air pressure is 3 psi. 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. Made To -Order Tank Notes I. 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 double-wall tank may alter the anchoring strap locations. The standard anchoring strap locations are indicated by arrows. 5. All additional manway covers should include at least one fitting to facilitate future volumetric precision tank testing. 6. Tank bottom deflector plates are standard under every manway and fitting. 7. All Model "P" tanks include a Fiberglas reser. voir integrally constructed to the tank top at the locations noted in the standard tank drawings. The reservoir includes one 4" NPT half coupling fitting (6" NPT fit- ting for 10' diameter tanks) mounted on the top of the reservoir allowing access to the cavity between the inner and outer tank walls. S. In addition to the monitor. ing fitting located in the Fiberglas reservoir, tanks 4000 gallon capacity and larger include one addi- tional monitoring fitting (4" NPT) located at the tank top near the manway.