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Effective Valve Closure Time In Surge Analysis


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#1 SawsanAli311

SawsanAli311

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Posted 25 April 2020 - 04:02 AM

Dear All,
 
I have been looking into the subject for surge water hammer impacting design parameters. For systems with actuated valves we tend to consider the valve closing time based on a typical value of 1 in / sec. However, I came across the principle of effective valve closure time which in fact represents the critical last 25% of the valve closing time of a gate valve for example. Some design standards consider surge evaluation for full bore actuated valves based on the effective valve closing time. If we consider so, then we would conservatively estimate the valve closing time i.e. too fast closing and hence directly impacting the surge pressure.
Appreciate your views on whether total valve closing time is the influential in surge analysis or the effective valve closure time.. what is the phenomena behind having this effective valve closing time most critical?
 
Thanks





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