Surge Tanks and Control Systems

Here we answer some of the common questions that we get asked about our surge tanks and control systems

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If you can't find the answer to your question in the list below send us an email and we will do our best to answer you directly

What is the purpose of a surge tank ?

The purpose of a surge tank is to either reduce high surge pressures or to prevent very low surge pressures. The surge tank does this by having available at all times a calculated amount of liquid and air (or gas) that is connected to the main pipe so that it can either push additional liquid into the pipeline to support the line pressure and prevent low pressure, or accept an inflow of liquid from the line and prevent high pressures.

What is the difference between a bladder tank and a compressor controlled tank ?

A bladder type pressure surge tank has an internal membrane, usually made from rubber, that separates the compressible air charge from the liquid at the bottom of the tank, whilst a compressor type pressure surge tank does not.

What is the purpose of the internal membrane inside a bladder type pressure surge tank ?

The membrane prevents absorption of the gas charge by the liquid, so that the gas charge does not have to be re-charged with extra gas.

Does a bladder type pressure surge tank and a compressor controlled pressure surge tank perform differently ?

No, both types of vessels perform exactly the same function with the same effectiveness.

Should I have a horizontal vessel, or a vertical vessel ?

As long as you make sure that the surge engineer who designed the system is involved in the decision it does not matter whether you have a horizontal or vertical pressure surge tank as they will perform the same.

Which is cheaper to own, a bladder tank or a compressor controlled tank ?

Bladder type tanks are normally considered cheaper to purchase and cheaper to own.

Why might I choose a compressor controlled surge tank, or a bladder type pressure surge tank ?

You might choose a compressor controlled pressure surge tank where the pumping condition changes regularly, or you might choose a bladder type pressure surge tank where the equipment is remotely located, or where the there is a shortage of skilled labour to maintain the equipment.


Flo-Dyne Controls (UK) Ltd

Flo-Dyne Place, Asheridge Road, Chesham, Bucks, HP5 2PT, UK
Tel: +44 (0) 1494 770088
Fax: +44 (0) 1494 770099
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Contact us from: UK, Europe, Russia, Africa, North America, Central and South America

Flo-Dyne Controls (India) Pvt Ltd

2501, G-Square Business Park, Plot 25&26, Sector 30, Vashi, Navi Mumbai, India
Tel: +91 77-384-97-300
Email @

Contact us from: India, Asia, Middle East, China, Indonesia, Australasia, and New Zealand