subsea fasteners

[maggiemae]

I am questioning the decision to use or not to use flat washers when making a subsea bolted connection. I have heard somewhere in the past that they should not be used due to corrosion issues and it is best to just use a bolt and nut. Does anyone have real experience with this?

 

[TVP]

Generally speaking, washers are not used in subsea bolted connections. Here are some references that you can review for more information:

Bolting materials subsea

http://www.offshorecenter.dk/log/filer/1_7 DNV.pdf

JOINING METHODS - TECHNOLOGICAL SUMMARIES

http://www.ptil.no/getfile.php/z Ko...kerhet/Hms-Aktuelt/Dokumenter/dnvrapport2.pdf

NORSOK Standard L-004 Piping fabrication, installation, flushing and testing

http://www.standard.no/PageFiles/18186/l004u2.pdf

NORSOK Standard L-005 Compact flanged connections

http://www.standard.no/PageFiles/1209/L-005r1.pdf

NORSOK Standard M-001 Materials selection

http://www.standard.no/PageFiles/1176/M-001.pdf

Specification for bolt and nuts for SPO CFS for subsea and/or low temperature use

http://www.vectorint.com/Media/SPO-Bolt-Subsea.pdf