Surge Vessels

Bladder Type Surge Vessel

ERGIL Bladder Surge Vessel (also called hammer tank, hydropneumatic surge control vessel or expansion tank) is designed to control the surge with a butyl rubber inside the vessel. In order to provide the required elasticity to push the water into the system following a pump trip, calculation of pre-charge pressure will be vital. If there is no contact between the compressed air and the water, there will be no dissolution. In this way, there will be no need for a permanent regulation system including compressors, etc.

When the vessel has been stimulated and correct the pre-charge has been introduced, the vessel will operate automatically, depressurizing once called upon and refilling with the return waves until naturally reaching its steady-state balance. The internal bladder is often made from high tensile rubber with or without reinforcements, in Neoprene, Nitrile (Buna-N), Food Grade Butyl or Hypalon Rubbers, or expanded to fit the whole vessel. The bladders are complying with a flange at the top as per client’s vessel details.

Bladder Type Surge Vessel 34Bladder Type Surge Vessel 35

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Want to know more? Check out our catalog for a complete overview of our offerings. With our catalog, you’ll have access to all the technical details you need to make an informed decision about our Surge Vessel products.

Bladder Type Surge Vessel 37
Bladder Type Surge Vessel 38
Bladder Type Surge Vessel 38
Bladder Type Surge Vessel 37


All products are engineered according to industry requirements.


Designed to ASME B31.4 , ASME B31.8 and ASME Section VIII Div. 1 Codes.


All welds are 100% inspected and tested. All products are accordingly tested.

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Surge Vessel Models

Bladder Type Surge Vessel
Compressor Type Surge Vessel