SSV closing time
SSV closing time
(OP)
hi
What is the maximum time expected for SSV to close (by de-energize the hydraulic control of actuator) ?
What is the maximum time expected for SSV to close (by de-energize the hydraulic control of actuator) ?





RE: SSV closing time
Closure should be around 15 seconds?
No more than 30.
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RE: SSV closing time
On a hydraulic actuator, time to close is much better than for an air operated valve - it also depends on the size of the return hydraulic line - if there are many SSVs' and they all close at the same time, then closing time would be slower than for a single SSV only. If you have a slow closing SSV, then one of more of the return lines or the return manifold may be the bottleneck.
RE: SSV closing time
15 s : is there a standard or is it a best practice or a company specification ?
RE: SSV closing time
In the absence of a company standard:
For an air op SDV, typical closing speed is about 1inch to 1.5inch of nominal size per second, so would guess that for a single acting, fail close SSV, you should get approx 2inch of nominal bore per sec or better.
So, for an SSV on a 6inch line, closing time = 3sec or better.
RE: SSV closing time
the distance between the Christmas Tree and the control-panel is 50 meters
RE: SSV closing time
Now we know valve you're talking about, no, there is no set figure AFAIK, only guidelines and perhaps company standards and targets.
The oft quoted 1 inch per second is just a guide. 50 m of tubing - closure will depend on tubing size and size of the return spring, but max time for say a 6inch valve 10 to 15 seconds. In reality most of the time it would be probably about 5 or less.
I got a 16" class 600 ball valve to close in 3 seconds to 5 seconds - needed two air ports and a BIG spring, but it did it.
Why are you asking??
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: SSV closing time
as we only have values without Reference to any standard , i'm looking for a document that gives an explanation.
RE: SSV closing time
If it is safety critical that your valve shuts in 2 seconds, then you design it to shut in 2 seconds. If 10 seconds doesn't result in significant safety issues then it is more economic to design it to shut in 10 seconds (smaller tubing, smaller springs, less complex electronics etc etc). Taking 30 seconds or 60 seconds to close defeats the point of having the valve. All highly variable.
Not everything is prescribed in a standard or design code.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: SSV closing time
RE: SSV closing time
RE: SSV closing time
RE: SSV closing time