توضیحات :
NFPA 68 – Standard on Explosion Protection by Deflagration Venting
۲۰۱۳ Edition
Chapter 1 Administration
۱-۱* Scope. This standard applies to the design, location, installation, maintenance, and use of devices and systems that vent the combustion gases and pressures resulting from a deflagration within an enclosure so that structural and mechanical damage is minimized.
۱-۲* Purpose. The purpose of this standard is to provide the user with criteria for design, installation, and maintenance of deflagration vents and associated components.
۱-۳* Application. This standard applies where the need for deflagration venting has been established.
۱-۳-۱ This standard does not apply to detonations, bulk autoignition of gases, or unconfined deflagrations, such as open air or vapor cloud explosions.
۱-۳-۲* This standard does not apply to devices that are designed to protect storage vessels against excess internal pressure due to external fire exposure or to exposure to other heat sources.
۱-۳-۳ This standard does not apply to emergency vents for pressure generated during runaway exothermic reactions, self-decomposition reactions, internal vapor generation resulting from electrical faults, or pressure generation mechanisms other than deflagration.
۱-۳-۴ This standard does not apply to venting of deflagrations in oxygen-enriched atmospheres or other oxidants unless supported by specific test data.
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