Pressure Relief Solutions

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Most Common Causes of Overpressure

Ø   BLOCKED DISCHARGE

When ever an inlet stream pressure can exceed themaximum allowable working pressure (MAWP) of the receiving tank or otherequipment, overpressure protection is needed in case of outlet blockage.

Ø   EXPOSURE TOEXTERNAL FLAMES

External fire or loss of coolant can cause theprocess medias to pass into critical or super-critical range during the durationof a fire as the temperature and pressure increases.

Ø   THERMAL EXPANSION

When a liquid filled system is blocked and heated,the resulting expansion can cause very high pressure.

Ø   CHEMICAL RUNAWAYREACTION

Protecting from overpressure is probably themost complex due to the “runaway”exothermic reaction resulting in high rates ofpressure and/or temperature increases.

                                                                       

Why Needed OverpressureProtection Devices

Ø   Protection of personnel and property

Ø   Satisfy requirements of applicable codes and regulations.

Device used to relieveexcess pressure in the system.

Common types include:

            Ø    Pressure Relief Valves

            Ø    Pressure/Vacuum vents

            Ø    Shear/Breaking Pin

            Ø    Buckling Pin Device

              Ø    Rupture Disc