Classes of impounding systems.

Current as of 1999-10-01 Government source

Pipeline and Hazardous Materials Safety AdministrationOfficial agency material

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(a) For the purpose of this part, impounding systems are classified as follows:

Class 1. A system which surrounds the component served with the inner surface of the dike constructed against or within 24 inches (610 millimeters) of the component served. Class 2. A system which surrounds the component or area served with the dike located a distance away from the component or at the periphery of the area. Class 3. A system which conducts a spill by dikes and floors to a remote impounding space which does not surround the component or area served.

(b) In the case of an impounding system consisting of a combination of classes, requirements of this part regarding a single class apply according to the percentage of impoundment provided by each class.

[45 FR 9203, Feb. 11, 1980, as amended by Amdt. 193-16, 63 FR 37505, July 13, 1998]

Meanings are ordered from the narrowest applicable scope.

Componentbinding

means any part, or system of parts functioning as a unit, including, but not limited to, piping, processing equipment, containers, control devices, impounding systems, lighting, security devices, fire control equipment, and communication equipment, whose integrity or reliability is necessary to maintain safety in controlling, processing, or containing a hazardous fluid.

49 CFR 193.2007Applies at 49 CFR Part 193 scope

Dikebinding

means the perimeter of an impounding space forming a barrier to prevent liquid from flowing in an unintended direction.

49 CFR 193.2007Applies at 49 CFR Part 193 scope

Impounding spacebinding

means a volume of space formed by dikes and floors which is designed to confine a spill of hazardous liquid.

49 CFR 193.2007Applies at 49 CFR Part 193 scope

Impounding systembinding

includes an impounding space, including dikes and floors for conducting the flow of spilled hazardous liquids to an impounding space.

49 CFR 193.2007Applies at 49 CFR Part 193 scope

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Retrieved: Aug 12, 2026
Version: 1999-10-01

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