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Low-Pressure Storage Tanks Venting Equipment/Relief Valves

What is Tank Venting?

Tank vents allow the flow of air/vapour in and out of a storage tankprocess vessel or line and control the pressure within vapour space.


Because without tank vents, the transfer of fluid would compromise the integrity of the vessel. When you fill a vessel, air/vapour needs to be allowed to escape else the vessel will burst. When you empty a vessel, air needs to be allowed to enter else it will implode. We call this escape and entry of air ‘breathing’. A tank needs to be allowed to breathe, not only through filling and emptying but when thermal effects influence – imagine a vessel in full sunlight all day, only to be hit by a rainstorm as the sun goes down – the rapid cooling of the product with result in a significant vacuum which needs to be relieved.


Emissions-Control-–-Breather-Valves-Service-and-Inspection-3Fuel Storage TerminalsRefineriesPharmaceutical PlantsDistilleries, Breweries, Gas plants, Oil Platforms, FPSO’s, Chemical Plants and anywhere using atmospheric storage vessels and vent lines.

Tank venting is where Assentech started and we are proud to offer the widest range of equipment on the market, backed by over 20 years engineering expertise in the field. We offer a broad portfolio of equipment for pressure relief, vacuum relief and emergency relief in a range of materials including exotics and fibre reinforced plastics.

Tank Venting isn’t rocket science, but it’s not always as straightforward as it may seem. At Assentech, we take a consultative approach to your requirements, offering you the benefit of our experience and sizing as part of the service. We size to API2000 7th Edition using our sizing software and work closely with the manufacturers to ensure you get the best equipment for the job.

The equipment we supply is of this highest quality money can buy. We are committed to satisfying customers’ needs with good quality, high integrity equipment. Groth’s products stand head and shoulders above the competition with a number of unique features.

When CHOOSING the RIGHT breather valves/relief valves, It is of vital importance that companies make informed choices and not to base their buying decisions around the price alone when the actual cost difference between quality (peace of mind) and potentially unregulated products is negligible in the long-term scheme of things.