The emergency vent pipes for flammable liquids or gases in refining units should be equipped with purging facilities

The requirement specified in 7.2.2 of the \"Code for Process Design of Refining Units\" that \"the emergency vent pipes for flammable liquids or gases in refining units should be equipped with purging facilities\" is intended to enable the rapid and safe discharge of such flammable liquids or gases in emergency situations, thereby preventing potential accidents. The so-called \"purging facilities\" refer generally to devices that use certain pipes and equipment to remove flammable substances from equipment or pipelines. These can be steam systems or nitrogen systems, both of which can be used for purging purposes. The choice of system depends mainly on the actual operating conditions and safety requirements. Steam purging can provide a high purging force, but the moisture in the steam may cause other problems. Nitrogen purging is safer as it does not cause oxidation, but a higher pressure may be required for effective purging. Therefore, the specific type of purging equipment to be chosen depends on the actual process conditions and safety requirements. .