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Old 12 March 2007, 12:12   #11
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Originally Posted by codprawn View Post
Depends how they are done - bloke who used to have a unit opposite mine was a great tig welder - did loads of work for the chemical and food industry. His welds were smooth as a babies bum inside so that glass liners could be slid into the pipes and valves. The way they do it is to fill with Argon first.
...interestingly "Baby's Bum" is a colloquial expression, in welding terms, for a poor weld profile whereby there is sink/suck back in the centre of the weld bead causing it to have the profile of a "Baby's Bum"... so a weld that looks like a “Baby’s Bum” is considered poor….not a lot of people know that…
Penetration is properly controlled with weld prep profile, gap and welding speed/technique. ….
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Old 12 March 2007, 12:26   #12
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Bloody hell I learn something every day!!!
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Old 14 March 2007, 18:04   #13
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Hi Eupa,

Just thinking about your split tanks.
It seems to me that if both went, then the tanks were of iffy condition before they went. Did they go at weld section from corrosion or split weld.
If they went by corrosion, then where else need attention.
If the weld split, then it can continue to split.

Do you have photos of situation, I am thinking along the lines of stent but I think there seems little choice except surgery.

Maybe I am missing something so photos needed.

Aidan
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Old 15 March 2007, 05:22   #14
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Thanks Pete 7. 55 gallons is not that big.
For rib tanks 14 years ago it was.

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BWM dont make their own tanks- so I do not understand where you are coming from.
Correct, they would have sourced the cheapest tanks to do the job. My point is they didn't use expensive fittings, they couldn't if they wanted to compete at the budget end of the rib market.

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Yessir, I do stress the bloody boat a bit- but that's whats ribbing all about.
Agreed, and those tanks have earned there money, time to replace with some nice new ones with lots of baffles inside.

Pete
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Old 15 March 2007, 12:15   #15
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lets be honest BWM was know for high quality fabrications. Pete


Oh Mr 7 you are so funny. The 1997/1998 interation of BWM, built by a chap in Bridport who I believe has since fled the country was not reknowned for high quality fabrications. Our DS21 split it's fibreglass underdeck fuel tank first time out - 40 galls of petrol sloshing around the hull/deck void is not an experience to be easily forgotten. The tank was replaced by a stainless steel one which of course involved cutting a dirty great hole in the deck. In hindsight we should have rejected the boat then but we were in the whole learning curve thing. Other things that fell off were most things screwed to the console, the A frame screwed into the deck with self tappers and the drivers pod seat. By the time we sold her all of this had been fixed with the help of people who gave a damn about what they were doing.

EUPA you have no real choice for peace of mind other than removing the tanks and replacing with new. Occupational hazard of a 14 yr old boat unfortunately.
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Old 15 March 2007, 18:46   #16
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Oops, well spotted Alan, I seemed to have missed a little word out and completely changed the meaning. Stick not in the sentence. Interesting they tried fibreglass tanks, they also tried plastic tanks from a dubious source, which promptly melted when filled with petrol

Pete

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Old 16 March 2007, 08:59   #17
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If you have got to cut them out can you then make the hole into some kind of hatch nice frame to cover the cutout edges and stiffen the deck, waterproof hatch so it looks like it should be there?


James
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Old 16 March 2007, 16:24   #18
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If you have got to cut them out can you then make the hole into some kind of hatch nice frame to cover the cutout edges and stiffen the deck, waterproof hatch so it looks like it should be there?


James
I'm yet to see a hatch you could get two 55 gallon tanks through
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Old 17 March 2007, 03:30   #19
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I'm yet to see a hatch you could get two 55 gallon tanks through
One at a time
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Old 17 March 2007, 04:39   #20
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One at a time
Still be a 'uggin big hatch.. Ponder the size of a 45 Gallon oil drum...... then add 25%.....
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