Products/Tank Protection & Venting/EFE30

EMERGENCY VENT COVER

EFE30
  • Additional emergency relief capacity beyond the normal tank vent
  • Weight- or spring-loaded settings from 50 to 10,000 mmH₂O
  • 16, 20 and 24 inch sizes for atmospheric storage tanks
EFSVALVES EFE30 weight-loaded emergency vent cover for storage tanks
EFSVALVES EFE30 weight-loaded emergency vent cover for storage tanks
Datasheet

Applications

Configured Service Scope
Chemical
Gas
Oil & Gas
Petrochemical
Storage Tanks

Key Specifications

NOMINAL SIZES16", 20" and 24" (DN400, DN500 and DN600)
PRESSURE SETTING RANGE50 to 500 mmH₂O weight loaded / 500 to 10,000 mmH₂O spring loaded
BODY MATERIALSCarbon Steel / Stainless Steel
DISCHARGEEmergency pressure relief to atmosphere
CONNECTIONTank-mounted flanged connection

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FAQs

Normal tank venting manages the pressure and vacuum changes associated with routine operating conditions. The EFE30 provides additional emergency positive-pressure relief capacity for abnormal conditions where the normal operating vent may not provide sufficient relieving capacity.
An emergency vent should be considered when a credible abnormal condition can generate a relieving requirement greater than the capacity of the normal operating tank vent. The EFE30 is intended to provide this additional emergency positive-pressure relief capacity. Final selection should be based on the governing emergency scenario and required relief flow.
No. The EFE30 is intended for emergency positive-pressure relief only. Normal pressure control and vacuum protection must be provided by the appropriate tank venting equipment.
Yes. External fire exposure is specifically identified as one of the emergency scenarios for which the EFE30 can provide additional tank-relief capacity. Final sizing should be based on the governing emergency scenario, tank geometry, exposed or wetted surface area, set pressure and required relief capacity.

ABOUT EFE30

The EFE30 emergency vent cover is a large, quick-opening pressure relief device for atmospheric storage tanks. It provides additional positive-pressure relief capacity during abnormal conditions such as external fire exposure or excessive vapour generation when the normal operating vent may not provide sufficient capacity.

When tank pressure reaches the selected set point, the cover lifts sufficiently to discharge the required emergency flow to atmosphere. As pressure falls, it returns to its seat automatically. The EFE30 provides emergency positive-pressure relief only; normal tank pressure control and vacuum protection require the appropriate operating vent.

The unified range includes a weight-loaded configuration from 50 to 500 mmH₂O and a spring-loaded configuration from 500 to 10,000 mmH₂O. The loading arrangement is selected from the required opening pressure rather than treated as a separate product.

Available nominal sizes are 16, 20 and 24 inches (DN400, DN500 and DN600) in carbon steel or stainless steel. Final selection must be based on the governing emergency scenario, required gas or vapour capacity, set pressure, allowable overpressure, tank design conditions, connection details and material requirements. Fire-case sizing also requires the tank geometry and exposed or wetted surface area.

Frequently Asked Questions

Normal tank venting manages the pressure and vacuum changes associated with routine operating conditions. The EFE30 provides additional emergency positive-pressure relief capacity for abnormal conditions where the normal operating vent may not provide sufficient relieving capacity.
An emergency vent should be considered when a credible abnormal condition can generate a relieving requirement greater than the capacity of the normal operating tank vent. The EFE30 is intended to provide this additional emergency positive-pressure relief capacity. Final selection should be based on the governing emergency scenario and required relief flow.
No. The EFE30 is intended for emergency positive-pressure relief only. Normal pressure control and vacuum protection must be provided by the appropriate tank venting equipment.
Yes. External fire exposure is specifically identified as one of the emergency scenarios for which the EFE30 can provide additional tank-relief capacity. Final sizing should be based on the governing emergency scenario, tank geometry, exposed or wetted surface area, set pressure and required relief capacity.
When tank pressure reaches the selected set point, the cover lifts far enough to deliver the required capacity to atmosphere. It reseats automatically after tank pressure falls.
Yes. EFE30 is presented as one product covering both loading arrangements. The weight-loaded configuration is selected for 50 to 500 mmH₂O, while the spring-loaded configuration covers 500 to 10,000 mmH₂O.
Emergency relieving scenarios can require significantly greater gas or vapour capacity than normal tank breathing. The EFE30 is therefore offered in 16, 20 and 24 inch sizes for high-capacity emergency pressure relief from atmospheric storage tanks. Final size should be determined from the actual emergency relief case rather than tank nozzle size alone.
The commercial range is offered in carbon steel and stainless steel. The final grade and compatibility must be confirmed against the stored product, vapour, temperature, external environment and project corrosion requirements.
EFE30 is installed directly on an atmospheric storage tank roof nozzle or at the end of a vent connection, with the emergency discharge released to atmosphere.
Sizing considers the governing emergency scenario, required gas or vapour flow, set pressure, allowable overpressure, tank design limits, fluid properties and temperature. Fire sizing also requires tank geometry and exposed or wetted surface area.
Provide the stored fluid and vapour composition, operating and relieving temperature, set pressure, allowable overpressure, required emergency relief capacity or sizing case, tank dimensions and design pressure, exposed area for fire sizing, nozzle size, flange details, body material and documentation requirements.
Yes. The EFE30 can be considered for EPC and project-managed applications where the emergency relief scenario, required capacity, set pressure, allowable overpressure, tank design data, materials, flange details and documentation requirements are defined during the RFQ stage. Final sizing and configuration should be confirmed against the actual tank and emergency-case data.