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Subchapter 15. Petroleum Safety Orders--Refining, Transportation and Handling
Article 22. Loading and Unloading Platforms and Operations
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§6881. High-Vapor Pressure Hydrocarbons.

(a) High vapor pressure hydrocarbons shall not be loaded or unloaded into or from tank cars or trucks where flammable vapors may reach a source of ignition.

(b) Each loading facility shall be provided with hose approved for such loading. Unless hose of the all metal type is used, the loading line and hose shall be so equipped and connected that if the hose should break the liquid stream will be shut off without excessive liberation of liquid and vapors. This may be accomplished by the operation of automatic shut-off valves; a shut-off valve operated by remote manual control; or other equally effective means.

(c) The loading line and hose between the loading valve and tank car or truck tank valve shall be fitted with a bleeder line to release the contents to a safe place after loading is completed.

(d) Each loading facility shall be provided with a vapor return hose or other connections for returning vapors from tank cars, tank trucks or trailers being filled. The vapor hose or other connections shall be so equipped and connected that vapors from a return vapor line will not be liberated in excessive quantities should the hose break. Vapors not returned through a return vapor line shall be released to a safe place.

(e) Positive displacement type pumps used for the transfer of high vapor pressure hydrocarbons shall have a pressure-relief device.

(f) The unloading line shall have a check valve installed adjacent to the discharge end of the unloading hose or pipe to prevent return flow of liquid or vapor in case of hose breakage.

(g) A vent or drain connection shall be installed for the purpose of bleeding off liquid or vapor from the hose after unloading. The vent or drain shall discharge to a safe place.

(h) Piping, valves and regulators at high vapor pressure hydrocarbon truck loading facilities shall be protected from damage by moving vehicles.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. Amendment of section heading and text and new NOTE filed 9-6-94; operative 10-6-94 (Register 94, No. 36).

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