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24th December 2017, 12:13 PM
#121
Re: missing sub
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18th January 2018, 06:15 PM
#122
Re: missing sub
U S Naval intelligence has released a report stating that ARA Sun Juan imploded and sank whilst proceeding at 10- 13 knots at a depth of 338 metres killing all 44 crew immediately. The energy released by the implosion was equivalent to 5669 kgs of TNT. The hull was pulverised in 40 milliseconds, the death of the crew would have been instantaneous and they would not have felt a thing
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18th January 2018, 07:35 PM
#123
Re: missing sub
the silence from Argentina is appalling , from an engineering point of view , cutting it in half and re-welding it together as a hull nearly 40 years old was a high risk strategy , at the pressure the hull takes means no faults , you are looking at 800 psi , I have used specialist welders on Ammonia vessels and systems , and x-rays of every inch still can find faults using ASME9 coded welders ex Sellafield , makes me think they wont want to recover it , to much may be revealled
Rob Page R855150 - British & Commonwealth Shipping ( 1965 - 1973 ) Gulf Oil -( 1973 - 1975 ) Sealink ( 1975 - 1986 )
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18th January 2018, 09:03 PM
#124
Re: missing sub
#123 Good morning Rob, I have enjoyed your posts for several years now ( since I first joined up to the site ) but never realised you had a pressure vessel welding background. I had twenty odd years with the Marine Dept and still have nightmares from the time a local engineering firm built the boilers for a new power station at New Plymouth. All the steam drums etc were designed to ASME 8, ASME 9 and BS 5500. 150 mm thick plate for the steam drums and 100% X Ray, not gamma or any other method. The first weld we tested had a seven hour exposure time and was done overnight -- unlucky for us but we set off every burglar alarm in the neighbourhood, it cost the firm hundreds of dollars for call out charges by the alarm people !!! After that we trucked the vessels to remote areas outside the populated areas and did the testing there, which cost thousands !!! Regards Peter in NZ.
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18th January 2018, 09:05 PM
#125
Re: missing sub
rob we may criticise health and safety sometimes but still when push comes to shove we need it? jp
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18th January 2018, 10:42 PM
#126
Re: missing sub
#125... very true John. When most of us criticise it is usually at the business side we do so. Health and. Safety has been in a lot of cases been made into a business and covers the whole strata. You can’t To my mind have one person who specialises in breaking strains of wires and ropes be a specialist also in every other aspect such as the collapsing figure of a submarines pressure hull. It takes people of that knowledge for each scene of disaster. We visualise the safety as the guy who tells you to put on your safety boots and In Some cases this is right. Each disaster is different and requires people with that knowledge in line with. The disaster. The old BOT lead the way in the past and imposed the limits considered safe for merchant vessels, and most ships complied with. Safety is a specialised job at different levels especially in engineering and. Pressure testing as in the case of underwater vehicles. Cheers JWS.
Last edited by j.sabourn; 18th January 2018 at 10:44 PM.
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19th January 2018, 06:00 AM
#127
Re: missing sub
I have suspicions about that re-welding as Peter pointed out to test it properly is complex business and expensive , very expensive , in a seam 25 mm wide by 600 mm long a couple of spots the size of a full stop could fail the weld depending on the standard used , think how much welding is required to rejoin a sub ,
Rob Page R855150 - British & Commonwealth Shipping ( 1965 - 1973 ) Gulf Oil -( 1973 - 1975 ) Sealink ( 1975 - 1986 )
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