Is this acceptable? 4

[JOHNPIA2]

Hello fellow PV collegues,

A long pressure vessel, U-stamped and Natl Board registered, has been completely fabricated, ready to ship to US. Due to shipping constraints, it is cut in two, cut edges prepared for welding on site by an 'R-stamp' qualified contractor, who also re-tests the vessel.

Is this acceptable? your opinion will be greatly appreciated, thanks.

 

[stanweld]

Yes.

 

[bernoullies123]

It is shame that we (myself) included cannot get the basis like length, width and height straight. O'well happens to the best of us.

No dramas in chopping it up, providing you are getting the R-stamp and AI sign-off onsite.

 

[bernoullies123]

Just need to be careful if the vessel was PWHT and that the PQR's etc were qualified for at least another cycle.

 

[JOHNPIA2]

Thanks guys; yeah, it is a shame we can never get the length right. Seriously, the alternatives are recipes for disaster, I have been there.

#1 Have the vessel fabricator do the field assembly himself. [Very expensive, union problems, possible sabotage].
#2 Vessel owner(O)has field work done by a qualified site contractor(C), who submits U-2 to the vessel fasbricator (F), who then issues the U-1. Since C is hired by O, he would not care less about F's QC needs; result is big arguments and problems. C's work has to be under the control and supervision of F, but it does not happen since C is being paid by O.
#3 Make C responsible for everything, have him sign the U-1; this is unfair to him and crazy!

So yes, oops too long, chop it n'ship it to site for repairs!

 

[vesselfab]

wait a minute

we have done this on numerous occasions and have not had a bit of problem with field contractors or owners.

the trick is to build the vessel with cutting it in halves from the beginning and having it prepped correctly for ease of field assembly with correct weld bevels to suit the field contractors weld procedure and fit up procedures.

our shop does not do any field work. period. we are not insured for it and do not have field equipment. many shops do not have the asme code field work in there manual and are not allowed by ASME to do work at locations other than their primary shop.

what we do, not saying it is the only way, is we build a complete vessel, pwht if required, hydrotest, issue a U-1A, match mark orientation at cut line, install fit-up keys to insure proper orientation is maintained, make a cut at proper location and bevel for field weld. The field makes the weld, pwht if req'd, all required NDE and issures a R report and stamp.

There is no reason for any hard feelings if everyone does there job correctly

 

[metengr]

Well said vesselfab. A star.

 

[JOHNPIA2]

vesselfab, we are intending to do exactly what you do, see my initial question, thanks.