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Emergency Relief Vents

Features & Benefits
  • Optimised design – high venting capacity
  • Non-sparking – ensures optimum safety
  • Superior sealing – leak-proof under normal operating conditions
  • Hinged pallet – easy tank/ vessel access
  • Cost effective – low cost maintenance
  • Superior quality – designed and tested in the UK
  • Versatile – available in spring-loaded vacuum format
  • Flexibility – wide range of materials, sizes and set pressures
  • Excellent service – pre and post-sales technical support

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Principle of operation

Emergency Relief Vents

Emergency Relief Vents are fitted to storage tanks to allow emergency flow due to the excessive venting requirement from a fire burning around a storage tank. This eliminates a costly tank rupture, providing emergency venting from abnormal internal pressure beyond the capability of the pressure relief vent. In the event of a fire, the pallet will lift at a pre-determined pressure, thus creating a large venting area.

A PTFE insert is provided to achieve leak tight sealing between the pallet and seat under normal operating conditions. An alternative model is available, fitted with an additional spring-loaded vacuum valve that will open under negative pressure to protect the tank from any damage that may occur under vacuum conditions.

Standards Compliance

Elmac’s products comply with all relevant industry standards including ATEX & ISO 16852 (Flame Arresters); API 2000/ISO 28300 & NFPA30 (Venting & Storage of Combustible Vapours & Liquids) and possible BLEVE (fire engulfment) incidents. In addition, Elmac is accredited to the following international standards: ISO 9001 (Total Quality Management), ISO 14001 (Environmental Management) and OHSAS 18001 (Occupational Health & Safety).

Enviromental Management Quality Management EX CE

Technical Specifications

ModelEmergency Relief Vent
Sizes (Nominal Bore)10” 12” 16” 18” 20” 24”
Process ConnectionAPI650 (20” & 24”) ANSI 150# Special (on request)
MaterialsAluminium Carbon Steel Stainless Steel Special (on request)
Diaphragm and InsertPTFE
WeightLead Plate (Standard) Stainless Plate
Pressure Settings3”wc (4.5mbar) – 48”wc (+70mbar)
Higher pressures may be available upon request.
Vacuum Settings3.46”wc (9mbar) – 10”wc (25mbar)
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