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For tanks of a capacity of 500 gallons (1893 L) or less, the fill connection may be located indoors provided that discharge of vapor from the fill port is prevented from entering the building or structure during and after filling. An automatic spring-loaded vertical check valve in the fill line or other device designed to prevent vapors from escaping shall be provided. The fill line shall be capped immediately after filling.

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Section 1306 Fuel-Oil Piping and Storage, Oil Gauging
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Reference Standard 16 Plumbing and Gas Piping [PDF] (page 26)
in the same manner as the separator. (5) OIL STORAGE TANK.-Each separator shall have an oil storage tank available for storing the residue from ...