[BITList] hd bolts

[x50type at cox.net]

Hugh

ship is a USN amphibious landing platform dock powered by Four Colt-Pielstick diesel engines, two shafts, 40,000 hp (30 MW) 
[I would imagine a colt-pielstck diesel engine is something between a revolver and a fire pump, only bigger and fairbanks morse is in there somewhere, so heaven knows how much they cost!]





there is no knowing what these useless clowns in the USN and Avondale have been up to.....................
I’ve been in this shipyard and see how they fuck stuff up – usual american system – full of john wayne’s and not enough indians!

of this type of ship, all the ones built at avondale needed extensive fixing up once they left avodale. [in fact all the ships built at avondale need extensive finishing work once thy cleared the yard].
avondale is due to close next year..

as far as the hd bolts are concerned they could well have been welded and ‘fabricated’! avondale wouldn’t know the difference.
[but where were colt-pielstick engineers when they were installing the 4 engines-aligning-testing?]

however a word of caution, these maritime articles come from a US site [gCaptain.com which I am not familiar with] via a colleague here – and while the reporters seem to have good credentials their real world knowledge seems quite sparse – hence these type of questionable and unclear articles.

colin


From: HUGH 
Sent: Monday, August 13, 2012 1:55 PM
To: BitList 
Subject: Re: [BITList] improper

Colin,

You highlighted the main bits.

Fabricated bolts?  No wonder they were sub-standard.  Were they welded together with too thin welds?

What kind of engine were they holding down?  HD bolts holding down the frames?  Pretty long bolts if they were diesels.

There's only one way to install a fitted bolt - apply some approved "grease" and hammer it in.  How can it be improperly installed?

And finally - shear forces during a shock event.  Ramming the land?  The bolts on a direct drive diesel are subject to continuous shear forces from the thrust.  There may or may not be collision chocks to take abnormal forces.  Was it a metallurgical problem?

A storm in a teacup.

We once had a problem with some over-stressed cyl head studs on a Kincaid/B&W diesel.  All seemed kosher until someone thought to check the thread pitch.  It was wrong, too high, so the hydraulic torqueing up, while correct, was over stretching the studs.

Hugh.




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