P-91 fitting replacement
P-91 fitting replacement
(OP)
What is the accepted amount of base metal that is to be removed when replacing a defective fitting in an 18" 2" thick steam line?
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: P-91 fitting replacement
P 91 material!? What do you mean by defective (weld defect, base metal defect, crack, soft region...)? What type of repair are you doing to this main steam line?
RE: P-91 fitting replacement
RE: P-91 fitting replacement
If so, I would place the cut line just beyond the base metal HAZ width in the straight pipe section. Starting at the toe of the girth weld, measure 1" and this would be the cut line on an 18" diameter steam line (the 1" would be a safe distance to remove the original HAZ). Verify with hardness testing before cutting to assure uniform hardness with other location along the pipe spool.
RE: P-91 fitting replacement
RE: P-91 fitting replacement
There is no specific guidance related to separation distance between two girth welds for installing a pup piece - shop or field. If you need to install a pup piece, I would select a distance that avoids having any touching of base metal HAZ's but far enough to assure proper interpretation of RT results for the field weld.
RE: P-91 fitting replacement