Should there be a manual valve in front of the high-pressure electric gate valve?
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A new incinerator has been installed in the factory. Steam is generated by high-pressure bubbles, and there is a 10MPa high-pressure electric gate valve in place. However, during testing yesterday, the process engineer said that the machine was still under trial operation, and therefore our high-pressure gate valve couldn’t be tested – if it were opened, steam would flow through. I thought it would be sufficient to close the manual valve upstream, but the process engineer said that there is no such manual valve; the first valve after the bubbles emerges is this electric gate valve. I asked what would happen if the gate valve failed, and the process engineer replied that nothing was specified in the drawings, as they built everything according to those drawings. I’m not sure whether this is normal or not. I’d appreciate it if experts could advise me and let me know if there are any relevant standards
Manual valves are difficult to operate, which is why electric valves are used
Normally, manual valves should be installed on both the upstream and downstream sides of electric or pneumatic valves, and a bypass system should also be in place to allow the valve to be isolated for maintenance in case of problems
In current design concepts, those with secondary lines are rare. Instrument coordination testing should be completed before the trial operation of the plant, and a coordination testing plan should be established in accordance with the schedule for the process trial operation.
I need relevant standards or regulations to show to my supervisor; could someone expert please give me some advice?
I need relevant standards or regulations to show to my supervisor; could someone expert please give me some advice?
So what should be done if the electric valve fails? I need relevant standards or regulations to show to my supervisor; could someone expert please give me some advice?
The specific design includes both those with manual valves and those without them. For example, some install stop valves as well as bypass valves in front of and behind the automatic valve. For a turnkey project like this, it’s about saving money, so it’s not really a question of whether it’s right or not. It should be a question of whether it is needed and whether one is willing to do it.
No relevant regulations? Just that casually?
In the chemical industry, if it comes to control valves, bypasses are generally considered. If it only serves a switching function, there is basically no bypass provided. I’m not very familiar with thermoelectrics.