Is it necessary to shut off the valve when shutting down the pump via interlock?
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I’ve come across many process diagrams recently in which there is a check valve at the pump outlet, and an additional shut-off valve is installed afterward, which is interlocked with the liquid level in the reactor. Is this shut-off valve really necessary?
Let me show you a picture; otherwise I can’t explain it to you
There is no shut-off valve; the pump outlet only has a check valve, which generally does not seal properly, posing a great risk during maintenance. This cut-off valve is necessary.
It has a drain valve, pressure gauge, and gate valve
This needs to be determined based on production requirements. What if the material backflow causes an accident? ? ? It is recommended that when moving towards operational positions, focus should be placed on the principles of the processes. These days, there are many new employees who have just graduated from school; without understanding the principles behind the processes, they often tend to criticize those processes. Doubt,,,。 I’m not sure if it falls into this category; with all due respect, just providing this for reference.
I have been working in pipeline design for a few years; I just started working with processes recently
My current approach is a pneumatic on/off valve before the pump, and a manual valve + check valve after the pump. Front-of-pump interlock control, a backflow valve behind the pump to prevent backflow, and manual valves for ease of maintenance. If backflow is not to be prevented, just adding a manual valve will suffice!
Consider a few scenarios: 1. In the event of a pump failure, what is the pressure difference before and after the pump? Will backflow occur, and what are the consequences of backflow? 2. In the event of a fire, is it necessary to cut off and isolate adjacent equipment?