Frequently Asked Questions

Question 1:
Why does a SurgeGuard have the liquid inside its bladder, as you say this limits the cushion prefill pressure?

Answer:
With the liquid inside the bladder, as the pressure increases the bladder simply expands until it is supported by the pressure shell. This feature enables SurgeGuard to work in applications that are required to operate over a wide range of pressures.

Question 2:
What is the benefit of having the liquid outside the gas bag?

Answer:
Liquid outside the gas bag enables a high cushion pressure of the gas in the bag, AND the higher the shock cushioning pressure, the smaller the shock attenuator alleviator needs to be.

Question 3:
What if I do not trust the epoxy internal coating of your Jumboflex type water hammer cushion -- Then I have to pay for a pressure vessel shell that is made out of corrosion resistant materials, right?

Answer:
No - that is why we offer the Surgeguard type surge damper. But with the shock cushion air outside the liquid bladder, the precharge pressure has to be limited.

Question 4:
Where do I find pulsation dampers?

Answer:
Use this pulsation damper link or the one on the top of the page.

The Pipeline Shock Prevention People

Stop pump start up surge, valve closure shock, and shut down back flow water hammer using shock alleviators from the pipeline shock and surge prevention people, ShockGuard. Manufacturer of large vessels for high pressure with matching bladders, diaphragms, gas bags, and bellows, for over 1/3 of a century.

Shock Alleviators

Shock alleviators and shock accumulators do not alleviate shock, nor do surge alleviators and surge accumulators alleviate surge. SurgeGuard, JumboFlex, and FloatOlator all work in the same way. They provide a soft place, so that the pump does not have to instantly accelerate all the liquid in the pipe system when it starts. Similarly, they provide a place into which flow can continue, for a time, against increasing resistance, when a a valve has been slammed. In both cases, because time has been increased, peak pressure generation is decreased. In short, they all prevent the peak pressure from being generated.

Device and Technical Support

Sales and assistance for water hammer alleviators, hydraulic accumulators, pulsation dampeners, and surge attenuators for applications including but not limited to: shock, surge, water hammer, pressure pulsation, and flow fluctuation:

Chris Armitt M.E.
Manufacturing Engineer with the company since 1991.

Email: Chris.Armitt@Shock-Alleviators.co.uk
Telephone: --44 (0) 161-480-9625
Facsimile: --44 (0) 161-480-9627

Shockguard Ltd.
Greg Street Industrial Center
Unit 1
Greg Street, Reddish
Stockport, Cheshire
SK5 7BS | UK EU.

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