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521-I-04/00. Background: The argument for applying the two-thirds rule in API 521 is that the. API 521 does not provide depressurization guidance for specific types of equipment or vessels.api-521 Guide for Pressure relieving and Depressuring Systems Petroleum petrochemical and natural gas industries—Pressure relieving and depressuring systems This API standard specifies requirements and gives guidelines for determining overpressure causes, relieving rates for pressure relieving and vapor depressurizing systems in petroleum related industries.
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