Nozzles Fabrication 1

[Rhelm]

An attachment was mark up of the final fabrication drawings for the Froth Deaerator showing that two of the nozzles were fabricated without meeting the dimensions. 2" short. I am being asked to see if piping can accommodate this discrep, but I have been advised to check to see what the norm is for accepting errors like this. I guess I am asking that if you were inspecting this, and came across this issue, what action would you take? Should we ask for vendor to fix it? Should we adjust piping to accommodate?

 

[KENAT]

Depends on schedule, cost, risk...

In short, a lot of things you know but we don't.

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[JStephen]

It would be preferable to make the adjustment elsewhere if that stuff hasn't already been fabbed. I say this because, while a too-short nozzle is undesirable, reworking welded fittings is undesirable, too, so you're not necessarily gaining any value when you make the change.

I've seen solid plate flanges used as a spacer in between flange, and can't think what that's called, but it might be an option.

 

[Mr168]

If there is nothing design-wise that would mandate the need for a longer nozzle, then it is typically less expensive, less time consuming, and less authority involved when splicing in a pup piece to compensate for the length once the vessel is on site.

A common course of action would be to write a nonconformance on the vessel, give the vendor a padded rework cost for the pipe, and let them decide if they're going to come out and repair/replace the nozzle, or just eat your backcharge on the pipe rework. In my experience, the latter wins out 95% of the time.