Hello !
thank you both for your answers.
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 !
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.
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'
thanks all for your help. I have asked for clarification to the buyer.
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.
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...
You can now return to the important things in your life
