Stress checking requirement after revised pipe rooting at field.

[GOBLINTECHNIC]

For this flow of work
1. Pipe rooting was designed by piping design group
2. doing stress analysis by piping stress group
3. Revise drawing as per comment from piping stress group
.
.
.
etc.
Final step. Issue the drawing with stress report for construction

After that if at construction field have the problem with pipe rooting such as it is ostruct something and they want to change the old rooting

Did we need to doing stress analysis for new pipe rooting ?
Or revise the drawing to the as-biult drawing version only ?
Why ?

Thankyou.,

 

[pennpiper]

You need to do three things:
1. Do a new stress analysis for the revised routing
2. Retrain both the designer and the checker they do a better job of field survey, routing and checking in the future,
3. Require the checker to go to the field to walk down the routing before he or she does an analysis

 

[StressGuy]

A full analysis may not be necessary. However, an experienced stress engineer does need to compare the change to the approved routing and make an assessment of the impact. If the change is minor, the engineer may be able to approve it by inspection. However, if the change is substatial and/or involved rotating equipment, a more detailed review may be needed.

Now, what constitutes minor vs. substantial? That's really a judgement call and why it should involve a senior engineer.

Edward L. Klein
Pipe Stress Engineer
Houston, Texas

"All the world is a Spring"

All opinions expressed here are my own and not my company's.