P & ID Question (mystery symbol)

[roricaja]

I have a P & ID for a piping system at work with a mystery symbol on it, can anyone recall what this may mean? It is a small circle on the end of a 45 degree line. Some are filled in black some are not. No consistancy. Most are located close to to joints in both pipe and tubing. ?????

 

[Chance17]

Your correct - this seems to be a mystery symbol for PID's.
It is not a generally accepted symbol.

I found one reference - the black circle at end of 45-deg line represented an elevated Fire monitor.
The same reference had similar symbols for other type of Fire equipment -- but nothing with open circle.

I also checked my list of welding symbols -- did not find

I view this a 'site specific"

 

[rneill]

Often there is a legend sheet as the first page in a set of P&ID's, I guessing there isn't one ?

 

[BigInch]

The symbol to the right is even more nonstandard. Is that a connection with a jump-over. Looks more like a circuit diagram.

**********************
"The problem isn't working out the equation,
its finding the answer to the real question." BigInch

http://virtualpipeline.spaces.live.com/

 

[MortenA]

Could it be pipe supports/anchors?

Once in a while when piping engs. gets to make P&ID all sorts of weird symbols and intentions sneaks in ;-)

Best regards

Morten

 

[micalbrch]

Can't it be just a simple connection symbol which indicates that pipes do not cross but are connected to each other?

 

[BigInch]

That should be something like a + with a dot.

**********************
"The problem isn't working out the equation,
its finding the answer to the real question." BigInch

http://virtualpipeline.spaces.live.com/

 

[bernoullies123]

As far as I know, there is no 'standard' for the drafting of pids. Why not ask the author or client etc. Maybe it will be something to help explain a situation for which others are too lazy to note. I reckon a pid is (hopefully) more like a book and not a bible.

 

[rmw]

I'd like to see this in a larger view to get the context of what the PID is showing. I agree that it looks like an electrical dwg from what is shown (or maybe one of the old type sewing patterns.)

rmw

 

[saplanti]

These are the symbols of the specification changes in accordance with KKS Identification System in Mechanical Engineering for Power Stations Part B1.

The pin with empty pinhead represents interfaces between systems/plants and subsystems/plant sections.

The pin with full pinhead represents interfaces between piping subsystems.

So you need to obtain KKS system to understand the full concept.

Hope it helps.