effect of re welding on stress analysis
effect of re welding on stress analysis
(OP)
Dear All
Did cutting & re welding is effecting stress analysis of steam line ASTM A335 weld P91. if you have any standard reference for cutting & re welding of piping system kindly specify.
Regards
Did cutting & re welding is effecting stress analysis of steam line ASTM A335 weld P91. if you have any standard reference for cutting & re welding of piping system kindly specify.
Regards





RE: effect of re welding on stress analysis
1). What size and schedule of this line?
2). What is this line connected to on the upstream end?
3). What is this line connected to on the down stream end?
4). What is the normal and maximum Operating Temperature of this line?
5). Was the routing/configuration changed?
6). Was the one or more dimensions altered? If so, how many and by how much? Were these dimensions increased or decreased?
7). What was the reason for this alteration?
RE: effect of re welding on stress analysis
2). What is this line connected to on the upstream end? turbine main stop valve.
3). What is this line connected to on the down stream end? for HRSG Boiler
4). What is the normal and maximum Operating Temperature of this line? 132 BAR, 567 Deg C
5). Was the routing/configuration changed? No
6). Was the one or more dimensions altered? If so, how many and by how much? Were these dimensions increased or decreased? by cutting 3 Meter portion shall be removed for steam blowing and re instate after steam blowing by welding.
7). What was the reason for this alteration? Steam blowing purpose.
RE: effect of re welding on stress analysis
If it is correct then I would say that you do not need a new Stress Analysis and I don't think there is any standard reference beyond common sense for cutting & re welding of piping system.
RE: effect of re welding on stress analysis
If it ain't broke, don't fix it. If it's not safe ... make it that way.
RE: effect of re welding on stress analysis
So, adding a girth weld may affect the stress calculations.
What's the harm of notifying the engineer of the change? What's the risk of withholding the information on a 132bar steam line?
Communication is not a bad thing.
- Steve Perry
http://www.linkedin.com/in/stevenhperry
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RE: effect of re welding on stress analysis
this will effect the piping integrity or this may cause to increase the stress in piping system?
RE: effect of re welding on stress analysis
If it ain't broke, don't fix it. If it's not safe ... make it that way.