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# abreviation question on P&ID

## abreviation question on P&ID

(OP)
what is the meaning of W/E, A/S, and E/S on this P&ID

### RE: abreviation question on P&ID

Your best bet is to find the lead sheet that goes with this drawing because it's not always the case that these designations are standardized.

### RE: abreviation question on P&ID

I would say a/s is air supply and e/s is electrical supply.

But w/e has me stumped. Weather enclosure??

Is this somewhere very hot or very cold?


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

### RE: abreviation question on P&ID

the engineer company set the first drawing of P&ID set with the all symbols and nomenclature of the drawings

Here after you will find the meaning if this letters over a transmitter

https://instrumentationtools.com/piping-and-instru...

Horacio

### RE: abreviation question on P&ID

(OP)
Hello !
jari001, I don't have such title page or cover page.
LittleInch, 'air supply' and 'electrical supply' 100% makes sense, thanks !! for w/e = 'weather enclosure' not so much because the abbraviation appears for pumps/instruments/valves and tank nozzles even when inside (ambient temp around 20°c). I'll keep searching and waiting for subsequent replies maybe !

regards,
Dimitri

### RE: abreviation question on P&ID

(OP)
Hello Horacio,
thank you for your reply. The website you provided I also found and it is very thorough but I couldn't find 'W/E'.

thank you!

### RE: abreviation question on P&ID

Wireless/Electrical?

### RE: abreviation question on P&ID

since the "w/e" label is next to instrument and valves and no pipe data is given, this must be a preliminary P&ID.

the w/ - with ? could it possibly be with electric heat trace.

### RE: abreviation question on P&ID

Waterproof enclosure?

Actually the wireless idea might be a good one.

It's not actually on the valve itself, it's on the valve position indicator.

But the symbols are quite strange anyway. Some instruments have a strange squarred off bottom corner and some transmitters don't have square boxes around them so it doesn't follow normal ISA rules.

You have control valves with no signal coming into them but an air supply, so this drawing looks either half finished or drawn to different rules.

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

### RE: abreviation question on P&ID

(OP)
another example from another page : this time it's a MIBC (Methyl Isobutyl Carbinol) tank (ULC S601 certified). installed outside (-50°C to 40°C). It's almost on every nozzle/instrument/valve.
another diesel tank is identical

'waterproof enclosure' makes sense, but it seems to me a very complicated way to specify this on every single item (I have 20 pages of P&ID). they could've just wrote it in the notes. I'm still not convinced.
It's not W/electrical heat trace either.

it is indeed a preliminary P&ID

Someone suggested it means With/Equipment , i.e. installed on equipement as opposed to 'shipped separately'

regards,
Dim

### RE: abreviation question on P&ID

With Equipment is ok for some elements, but I agree, very odd that it is on virtually all the instruments or relief valves. Doesn't make sense on some of the isolated Pressure indicators though.

I'm still intrigued by the strange squared off circle drawing.

but -50 is rather cold.....

When you find out please come back and tell us.

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

### RE: abreviation question on P&ID

(OP)
Ladies and Gents, scholars and laymen, gather 'round for I possess extraordinary knowledge to bestow upon you.

Question: What is the meaning of the letters outside the circular symbols on the P&ID? (A/S or W/E) ?
Response : A/S means pneumatic actuator requiring air supply and W/E means device to be supplied as part of associated package.

see.... I told you it was EXTRA 'ordinary'

what a crappy abreviation...

Dimitri

### RE: abreviation question on P&ID

Wow... I'd have never guessed.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

### RE: abreviation question on P&ID

Did you get "them" to send you a lead sheet too?

### RE: abreviation question on P&ID

(OP)
jari001, no

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