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Unknown symbol - Geothermal steam piping

Unknown symbol - Geothermal steam piping

Unknown symbol - Geothermal steam piping

(OP)
Hi all

I'm assisting my geothermal colleagues and came across a symbol I don't recognize. Can anyone tell me what this symbol means and from what standard it is derived?



Thanks

RE: Unknown symbol - Geothermal steam piping

My guess is either a soft close non return valve or one that can be held open.

This is a made up symbol so you need the symbol sheet to be sure. No note next to it?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Unknown symbol - Geothermal steam piping

(OP)
@EmmanuelTop: I had seen that chart, it's the only symbol vaguely similar to this one.

@LittleInch: I think it must be some form of check valve based on the location in the system.



It's on the discharge of each cooling pump and on the return leg from the heat exchangers, where the bypass branch is connected.

There is no note or legend.

RE: Unknown symbol - Geothermal steam piping

Looks like it could be a "cycle stop" valve. Transient pressure controlling valve.


RE: Unknown symbol - Geothermal steam piping

It is most likely a Booster Pump Control Valve, a diaphragm actuated active check valve that opens fully or shuts off in response to electric signals. It isolates the pump from the system during pump starting and stopping, to prevent pressure surges.

RE: Unknown symbol - Geothermal steam piping

(OP)
@bimr: Sounds reasonable. Any thought on the origin of the symbol?

RE: Unknown symbol - Geothermal steam piping

I'm going to guess spring-loaded check valve.

Piping Design Central

RE: Unknown symbol - Geothermal steam piping

There's no electrical or instrumentation signal or actuation on it. For a parallel pump or indeed any pump you would expect an NRV on the discharge line - this is it, there isn't another one.

I'm going with a soft close NRV having seen the diagram.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Unknown symbol - Geothermal steam piping

$10 bet that it is.


RE: Unknown symbol - Geothermal steam piping

Don't know where this symbol came from. This fellow has the exact same symbol listed as a dual-plate check valve.

RE: Unknown symbol - Geothermal steam piping

But the 's' appears also on the butterfly valve, hinting that it refers maybe to a wafer-style body. I don't recall seeing that symbol for a butterfly valve either, though.

Piping Design Central

RE: Unknown symbol - Geothermal steam piping

Bimr,fair enough.

Kristjan, Like I said, find the symbol sheet.

Quite why you need to make this distinction on a p& id, I don't know.....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Unknown symbol - Geothermal steam piping

LittleInch did you lose my $1 bet?[ponder]


RE: Unknown symbol - Geothermal steam piping

I agree with LittleInch that unless the detail is important to operation, not every detail needs to be shown on the P & ID. This is something that can be handled with a valve schedule in the specifications.

In addition, you should confirm with the owner of the P & ID what this item is.

RE: Unknown symbol - Geothermal steam piping

(OP)
I queried the designer and it's a spring loaded NRV.

The exact type of valve isn't important, however i needed to know the function of the valve.

Thanks guys for your input.

RE: Unknown symbol - Geothermal steam piping

Just a check valve with a spring load against the flapper or ball to hold it closed until a constant positive flow is assured. This prevents the valve from opening too early when flow might be variable and cause fluttering or chattering, or amplify waterhammer.


RE: Unknown symbol - Geothermal steam piping

Yay for me.

Piping Design Central

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