[Milsurplus] OT: Loss of USS Thresher, SSN-593 - One-Half Century Today

[Gary Pewitt]

Yes after the Thresher disaster the Subsafe program was adopted and 
among -many- requirements was "J" threads on all high pressure valves.  
J threads have a radius on both the point and root of the threads to 
eliminate stress risers causing cracks that can lead to cracking at 
supersonic propagation speed.  Subsafe is still one of the most 
stringent quality assurance programs.



On 4/10/2013 7:00 PM, Mike Morrow wrote:
> Jerry wrote:
>
>> It sank because the manufacturer PUT VALVES IN BACKWARDS !!!
>> Sea water pressure opened them rather than sealing them.
> The information I learned from five years as an engineering officer
> on a submarine with engineering systems almost identical to Thesher's
> (no post-Thresher modifications) points to a failed brazed seawater
> connection, most likely in the auxiliary machinery space containing all
> of the HV electrical switch-gear.  There was never any allegation of
> improper valve orientation contained in the final investigation results.
>
> Mike / KK5F
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
>


-- 
Gary Pewitt   N9ZSV
1500 French Prairie Rd
Booneville, AR  72927