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Post by JohnV on Nov 9, 2016 10:34:40 GMT
Is that Bay Wharf? Thames Drydocking They've got some serious kit there ! Don't know what the proper trading name is ...... always known it as "Deverell's" 3 (?) Big floating drydocks + lots else, with a reputation for charging well.
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Post by bromleyxphil on Nov 9, 2016 10:54:04 GMT
Well guys I love the idea of thicker steel in place of ballast, does anyone build them in Hardox by the way? No one seems to have put me off the idea of sprayfoaming under the floor, I wonder why it isn't common practice? phil i am going to have to get my head round the terminology as I don't know my Chines from my Bilge at the moment. Sorry to quote myself but I think I "chined" my way from the point why do you think sprayfoaming under the floor isn't common practice? And how thick do you think the base plate and sides would have to be to do away with ballast?
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Post by JohnV on Nov 9, 2016 11:10:27 GMT
I am not sure (having never personally used one) if ultrasonic testers have problems with foamed steel measurements.
The only other downside that I can think of is welded repairs.
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Post by cuthound on Nov 9, 2016 11:30:58 GMT
Well guys I love the idea of thicker steel in place of ballast, does anyone build them in Hardox by the way? No one seems to have put me off the idea of sprayfoaming under the floor, I wonder why it isn't common practice? phil i am going to have to get my head round the terminology as I don't know my Chines from my Bilge at the moment. Sorry to quote myself but I think I "chined" my way from the point why do you think sprayfoaming under the floor isn't common practice? And how thick do you think the base plate and sides would have to be to do away with ballast? How thick the base plates and sides need to be will depend on the length, engine type and location and fitted contents of your boat. Best to discuss with the boatbuilders. Two potential sticking points: Cost - steel is more expensive than paving slabs. Flexibility - if the trim isn't quite right it is easy to move, remove or add conventional ballast. If you sprayfoam the baseplate it will not be easy to add or move ballast to get the trip to riget, although you could put it on top of the swims, at the expense of somethang else (exhaust, diesel heater, batteries etc) being there.
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Post by smileypete on Nov 9, 2016 12:12:07 GMT
Would have thought the draughts through any BSS mandated low level vents will greatly outweigh heatloss down through the floor. That said even just some foil bubble stuff on the underside of the floor should reduce heat flow downwards - to work as an effective radiant heat barrier the foil must have an air gap on one or both sides. Someone mentioned UFH, normally that goes into screed but there are 'spreader plates' available that could be fixed under the floor:
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Post by JohnV on Nov 9, 2016 12:12:55 GMT
^^^^^^^^^^^^^^^^^^^^^^^ all this plus the design draft of your hull and the capacity of all tankage
Dammit, Smiley Pete posted while I was typing !!! .... for cuthounds post obviously !!!
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Post by Deleted on Nov 9, 2016 12:59:33 GMT
Is that Bay Wharf? Thames Drydocking They've got some serious kit there ! Don't know what the proper trading name is ...... always known it as "Deverell's" Β Β 3 (?) Big floating drydocks + lots else, with a reputation for charging well. Yes the same place. I went there to enquire about having my boat lengthened. The geyser I talked to was called Mr Deverell (at least that was his email address)
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Post by peterboat on Nov 9, 2016 13:32:59 GMT
Chine is the angle where the bottom strakes of a hull meet the sides of a hull With a hard chine hull (or flat bottomed like narrowboats) the chine is a pronounced angle With a soft chine or rounded hull the angle changes gradually in a curve As Iconoclast says on narrow boats the flat bottom is extended beyond the joint with the sides to give a sacrificial edge that protects the welded joint On my old boat a survey said the edges would require replating due to high canal miles [on the chine] I had to look at a boaty book to find out what he was on about!!
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Post by peterboat on Nov 9, 2016 13:44:28 GMT
Well guys I love the idea of thicker steel in place of ballast, does anyone build them in Hardox by the way? No one seems to have put me off the idea of sprayfoaming under the floor, I wonder why it isn't common practice? phil i am going to have to get my head round the terminology as I don't know my Chines from my Bilge at the moment. Sorry to quote myself but I think I "chined" my way from the point why do you think sprayfoaming under the floor isn't common practice? And how thick do you think the base plate and sides would have to be to do away with ballast? 15mm should do it Chris has a NB with that thickness and no ballast Johnathon Wilson built it for himself. 8mm sides might be to heavy for a NB but would be good for the extra protection good luck with your research
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Post by Jim on Nov 9, 2016 14:23:50 GMT
Can't the foam soak up and hold water, if there is ingress, for whatever reason, therefore a bad idea?
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Post by JohnV on Nov 9, 2016 14:26:11 GMT
I'm no expert on the stuff but I think it is what is termed a "closed cell" foam which doesn't soak up anything it's in contact with
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Post by tonyqj on Nov 9, 2016 14:27:37 GMT
Can't the foam soak up and hold water, if there is ingress, for whatever reason, therefore a bad idea? I believe it's closed cell, so no. However, I wouldn't want to rely on 100% coverage of the steel and if there are any gaps that moisture can get into between foam and steel then it will.
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Post by bromleyxphil on Nov 9, 2016 14:41:36 GMT
Can't the foam soak up and hold water, if there is ingress, for whatever reason, therefore a bad idea? I believe it's closed cell, so no. However, I wouldn't want to rely on 100% coverage of the steel and if there are any gaps that moisture can get into between foam and steel then it will. No one seems to worry about that on the sides. The stuff is impervious to water and also moisture transmission so if a bit was missed out it should remain dry and rust free.
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Post by tonyqj on Nov 9, 2016 14:44:46 GMT
I believe it's closed cell, so no. However, I wouldn't want to rely on 100% coverage of the steel and if there are any gaps that moisture can get into between foam and steel then it will. No one seems to worry about that on the sides. The stuff is impervious to water and also moisture transmission so if a bit was missed out it should remain dry and rust free. The sides don't get spillages poured onto them. Hey, I'm not saying it won't work, I simply don't know.
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Post by kris on Nov 9, 2016 15:14:28 GMT
Quite a lot of round chined narrowboats have been built In the past. The 150 year old horse drawn elland being a good example.
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