API RP 1637:2025
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Using the API Color-Symbol System to Identify Equipment, Vehicles, and Transfer Points for Petroleum Fuels and Related Products at Dispensing and Storage Facilities and Distribution Terminals, Fifth Edition
standard by American Petroleum Institute , 08/01/2025
API RP 1637:2025 PDF
This recommended practice (RP) describes a system for marking equipment used to store and handle bulk petroleum, alcohol-blended petroleum and biodiesel products. The equipment marking color-symbol system described in this RP facilitates easy identification of products by means of colors, symbols and alphanumeric designations. The principal purpose of this marking system is to identify product transfer points for tank-truck loading and unloading at distribution terminals and retail outlets to prevent errors in product handling.
The marking system described in this RP does not cover aviation fuels.
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