[BITList] more on hd bolts

[franka]

We had all the bolts pop their heads after being torqued to the correct  
tension on the pedestal of a 150 ton crane, turned out that the radius 
under the head was incorrect and it could have been quite nasty but 
luckily it didn't topple off
frank

On 8/14/2012 11:2 cran2 PM, x50type at cox.net wrote:
> Malcolm
> the article didn’t say when exactly the bolt problem surfaced and 
> really didn’t make much sense to me.
> As the ship was built at avondale, any type of cock-up is 
> possible...............
> ct
> *From:* Malcolm <mailto:malcena2 at uwclub.net>
> *Sent:* Tuesday, August 14, 2012 9:47 AM
> *To:* BITList at lists.bcn.mythic-beasts.com 
> <mailto:BITList at lists.bcn.mythic-beasts.com>
> *Subject:* [BITList] FW: hd bolts
>
> Hugh & Colin,
>
> I think that I have missed something here. Did they find out when the 
> bolts were weak when the ship was strapped down when they were seeing 
> what the engines could do, or did they find the problem at the sea 
> trials. If so they must have been ridiculously weak if they could not 
> stand the friction of the ship moving through the water. Our ship yard 
> made their own bolts using the quality steel and sizes as specified by 
> the engine builders.
>
> Malcolm.
>
> ------------------------------------------------------------------------
>
> *From:*bitlist-bounces at lists.bcn.mythic-beasts.com 
> [mailto:bitlist-bounces at lists.bcn.mythic-beasts.com] *On Behalf Of *HUGH
> *Sent:* 13 August 2012 21:59
> *To:* BitList
> *Subject:* Re: [BITList] hd bolts
>
> Colin,
>
> They look to be fairly standard medium speed engines. If direct drive 
> to prop or gearbox, with internal or external thrust block, where is 
> the shock force on the bolts coming from?  Movement limiters (can't 
> recall what we called them) would be used with resilient mounted 
> engines for electric propulsion, though they would have a small 
> clearance.  Shear forces wouldn't come into it there.  Slow speed 
> diesels sat on CI chocks or resin similar, so fitted bolts were hardly 
> practical.  I can't see medium speed engines being any different.
>
> It pissed down yesterday, after 4 or 5 scorching days.
>
> Hugh.
>
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