Disposal System Back-flow Prevention Systems

Disposal systems should include equipment to prevent the infiltration of hazardous levels of air. This objective is normally achieved by using a flow of purge gas through the entire disposal system. The required flow rate of purge gas can be significantly decreased by the installation of a purge reduction seal.

The following sections provide a brief summary of purge gas flow requirements and of purge reduction and flare seals. See API Recommended Practice 521 for further discussion of these topics.

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