Pig Trap Nozzle

[jonjose123]

Hi All

We have Pig trap 24 x 18” and the balancing line nozzle is 4”.
Client asking for extruded branch for this nozzle, where as we have provided Pipe in pipe branch.
My question is if Reinforcement is required for this.

 

[TGS4]

What's your Code of Construction?

 

[jonjose123]

Design code is ASME B31.4

 

[LittleInch]

You need to do the calculation according to whatever code you are using (hopefully a pipeline code) to see if the removed metal is recovered somewhere else or not.

My guess is that re-inforcement will be required, but why not use a "weldolet" or "integrally reinforced fitting"

If this is the only line off the trap, 4" looks very small to me. I usually aim for 50% of the incoming line size, so 8" or 10" looks a bit more like it.


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

 

[BigInch]

I think that size is OK for a balance line. Kicker would normally be larger though.

 

[jonjose123]

So for the above case, we understand that it is advisable to provide reinforcement. Am I right.

Also vendor has provided a calculation showing the allowable nozzle neck thickness and actual thickness. If this case is OK… do we still need to provide reinforcement?

 

[LittleInch]

Read the answers - it depends on the code you are using for calculation, the design pressure, wall thicknesses etc. If you have a fairly thick 4" pipe this might be enough, ditto if your pig trap wt is thicker than it needs to be for only hoop stress.

Find the code, do the calculation.

however I can't see why you don't want to use an integrally reinforced branch fitting?

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