Is 24 hour cool down necessary for non exotic welding before MPI
Is 24 hour cool down necessary for non exotic welding before MPI
(OP)
Is it necessary to let steel sea fasting brackets (S355) fastening containers to a ship’s deck cool down before MPI?.
Would DNV insist on it, it is a DNV registered vessel?
Thanks
Would DNV insist on it, it is a DNV registered vessel?
Thanks





RE: Is 24 hour cool down necessary for non exotic welding before MPI
RE: Is 24 hour cool down necessary for non exotic welding before MPI
Can you please note where this requirement is stated ?
I would have thought the answer is no.
Regards,
DD
RE: Is 24 hour cool down necessary for non exotic welding before MPI
can you show me where it is written that it is no
Regards,
Denlow
RE: Is 24 hour cool down necessary for non exotic welding before MPI
RE: Is 24 hour cool down necessary for non exotic welding before MPI
look in this pdf.
Regards,
RE: Is 24 hour cool down necessary for non exotic welding before MPI
RE: Is 24 hour cool down necessary for non exotic welding before MPI
RE: Is 24 hour cool down necessary for non exotic welding before MPI
I fully agree with the logic behind it, for the reasons metengr explained above.
@ escapizm, you'll have to ask them for a reference.
RE: Is 24 hour cool down necessary for non exotic welding before MPI
Perhaps we've been cutting corners all these years but I've never come across it before.
RE: Is 24 hour cool down necessary for non exotic welding before MPI
I initially thought DNV would refer to EN 1090-2 as posted by denlow so I didn't respond further.
However, having a quiet day at work so thought I would investigate further
DET NORSKE VERITAS
RULES FOR CLASSIFICATION OF
Ships / High Speed, Light Craft and
Naval Surface Craft
PART 2 CHAPTER 3
Fabrication and
Testing of Ships
JULY 2013
SECTION 7 NON DESTRUCTIVE TESTING OF WELDS
For detection of surface imperfections the following methods applies: Visual testing (VT), Magnetic particle testing (MT) and Penetrant testing (PT).
202 For NV 420 grades and higher, final inspection and NDT shall not be carried out before 48 hours after completion unless heat treatment has been carried out.
NV 420 is steel with a minimum yield of 420 mpa and as you are using S355 (minimum yield 355 mpa) the hold period for NDT is not applicable to you,
Regards,
DD
RE: Is 24 hour cool down necessary for non exotic welding before MPI
RE: Is 24 hour cool down necessary for non exotic welding before MPI
RE: Is 24 hour cool down necessary for non exotic welding before MPI
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: Is 24 hour cool down necessary for non exotic welding before MPI
I write in connection to thread1083-344803: Complex Hydraulic Synchronising Problem, about the hydraulic synchronizing problem you solved last year (I am asuming everything went reasonably well, at least you had dealt with many contingencies). As it happens, I am working in a different company, which has larger machines that can manufacure the parts for a very large anular cylinder. We are now working with a project for a 1,200 ton force cylinder for R4 mooring chain, the central hole is 400 mm and stroke is 600 mm, equal to the length of each link.
We feel the anular cylinder you initially considered (with longer stroke) can be built and operated reliably, at reasonable cost. You can imagine: the guys in production are OK, the guys in engineering are excited, but the guys in finance are, as usual, skeptic. So, escapizm, I would need to ask if you think there would be demand for such a product, I can only guess it would be used for tensioning of FPSO mooring lines. Would you have been interested in such a product 18 months ago? Would you have rented it for maybe $30,000/month? Do you think other pros in the offshore industry would?
Your views are extremely valuable, and very much appreciated!
Aarne