p&id help please

[sdomermpc]

can someone please tell me why a nozzle and gate valve have same symbol in p&id, and how can we differentiate them? and also can someone post a guide how to read fabrication iso drawing and p&id complete symbol char

 

[pennpiper]

sdomermpc,
You wrote the following questions:
1. - why does a nozzle and gate valve have same symbol in p&id?
2. - how can we differentiate them?
3. - how to read fabrication iso drawing?
4. - p&id complete symbol chart?

My answers:
1., 2. & 4.: - They do not have the same symbol on normal P&IDs. Whoever did your P&ID does not realize there is an Industry Standard and the Industry Standard does not show vessel nozzles.
Try here:

https://www.google.com/search?q=ISA...8QCa1nGNX0AFM%3A;9PN9shR9SZHVrM;http%3A%2F%2F

http://www.informit.com%2Fcontent%2...ticle.aspx%3Fp%3D1915161%26seqNum%3D3;360;253

and here

http://www.academia.edu/8990016/P_and_ID_SYMBOLS_P_and_ID_SYMBOLS_ISA_Symbols_and_Loop_Diagrams

3. - Look here:

https://www.google.com/search?q=pip...=X&ei=MfJEVZjNFoKENqPbgeAE&sqi=2&ved=0CB0QsAQ

Sometimes its possible to do all the right things and still get bad results