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Chesprocott Health District - News: What is water hammer, why is it a problem, and what can be done to eliminate it?
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Section: Frequently Asked Questions
What is water hammer, why is it a problem, and what can be done to eliminate it?
Last Update: Apr 05, 2005

Water hammer is the instantaneous increase in water pressure that occurs when water flowing in a pipe stops abruptly (as with a snap action valve closing). The resulting pressure shock causes pipes to bang loudly and can result in costly damage to supply pipes and fittings. With small diameter pipes [causing high velocity flow rates] used extensively in residential plumbing system, lack of effective air cushions (water hammer arrestors), and increasing use of rapid shut-off toilet fill valves (plus servo valves in washing machines, etc.), water hammer problems have become more common, troublesome, and difficult to correct.SOLUTION: Toilet fill valves (like the Burlington Brass & Scovill brand ballcocks produced by CESCO) which operate on a pressure differential [i.e. working “against the water pressure” rather than “with the water pressure”], open slightly to relieve pressure increases & shock conditions, serving as quasi pressure relief valves. Since water (unlike air) compresses only slightly at increased pressure, only small amounts of water need to be discharged infrequently, harmlessly, and quietly into the toilet tank.



FAQ Introduction
Common Toilet Troubleshooting Steps and some Frequently Asked Questions.
How long should it take to fill the tank and how can that be regulated?
The time to fill the tank varies with the design and size of the tank.
Why do toilet suppliers caution against over-tightening the nuts on toilet tank fixtures and trim?
Toilets are made of vitreous china, an exceptionally strong and durable material but one that can crack if subjected to a sharp impact or excessive stress.
What is the best way to adjust the water level in the tank?
The techniques vary by design among toilet fill valves.
Why must the refill tube always be kept above the water level?
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How important is it to flush the line before or when installing a replacement toilet fill valve?
0
What are the leading causes of premature failure of all toilet tank fittings and what are the implications?
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Considering Cutting the Overflow Tube Below the C-L Marking on the Fill Valve?
Some fill valve suppliers and "how to" guides recommend cutting the overflow tube at 1" below the C-L mark on the valve. When should this be done?
Conformance with anti-siphon installation requirements of the ASSE 1002 Standard
Why does the critical level (C-L) mark of a toilet fill valve have to be a minimum of 1" above the top of the overflow tube (flood plain) to be in conformance with anti-siphon installation requirements of the ASSE 1002 Standard?
What is water hammer, why is it a problem, and what can be done to eliminate it?
Water hammer is the instantaneous increase in water pressure that occurs when water flowing in a pipe stops abruptly (as with a snap action valve closing).
Why does CESCO suggest that toilet repairs should be done by licensed plumber?
Should plumber’s putty, thread sealant, grease or lubricants ever be used in the installation or repairs of toilet fill
What is the least understood and most ignored routine maintenance tasks?
Why is it important to recognize and conform to anti-siphon codes?
What is thermal expansion in residential water supply pipes, why is it a problem, and what is the solution?
Why do many leading suppliers of [plastic] fill valves disclaim responsibility/reliability from product failures?
How much water should be in the bowl after the flushing cycle is completed and the fill valve shuts off?

 

Barry E. Walter Sr. Co. 2550 East Platte Avenue - Fort Morgan, CO 80701 - 800-767-5552

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