High Strength Enclosures for Deflagrations

This section and Chapters 6 and 7 of the code [27] apply to vessels and equipment capable of withstanding more than 1.5 psig internal pressure. These design procedures do not apply to a detonation that is not believed to be capable of being vented successfully [27]. 

The vent devices used to relieve the overpressure from the deflagration must be structurally sound, low in weight, and should not fragment to form missiles when the force hits the device. 

Rupture disks when properly sized and located on the potentially overpressure vessel have been shown to provide the best protection for a deflagration but not a detonation [54]. 

Determination of Relief Areas for Deflagrations of Gases/Vapors/Mists in High Strength Enclosures 

In order to calculate the same area results as the above noted charts for methane, propane, coke gas, and hydrogen, the following equaUon is presented by NFPA-68 [27]  

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