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copain 
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Joined: 10 August 2007 Location: Netherlands Status: Offline Points: 182 |
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 Posted: 26 May 2008 at 11:54 |
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Hi Ralf, Very wise decision. I'm in touch with Ralco tubings in the UK to get some more details. My first question (mail) to them.
Details: Would like to know if this tube can be used in a pressurized area and to what pressure. The smallest radius it can be bend to and does it resist constant vibration, like when used for coolingwater on a diesel engine Thanks in advance W.Smith.
Answer:
Dear Mr. Smith,
Depending on what size you are enquiring on, the working pressure will vary. Please see below link from our website, working pressure are listed under PN/Bar at 20dgC http://www.ralco-tubings.co.uk/hoses/search/search-armoflex-item-225.html The approximate bend radius is 8 x the inside diameter of the hose. It is not a rigid product, it is a flexible hose so should withstand a degree of vibration but I would guess it would depend on how you are intending to use it, ie over a short or long length & how powerful the vibration. Regards, Martin When you go to their site looking at the different pressures these tubes can withstand you might think they would be sufficient. But don't forget all this is at 20 degr C and they have no table stating how fast the pressure resistance deteriates with temperature going up. Apart from that our coldwaterhose bursted too. Also on their site they call it: PRODUCT #4480 - ARMOFLEX THERMOPLASTIC SUCTION DISCHARGE HOSE
From this answer a have mailed them again asking some more details on which I am now waiting.
Regards, Willem |
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s/y Copain (Beneteau 281)
from march 2008 Hanse 350 # 061 Visit my BLOG op http://www.wsv-haringvliet.nl/blog/maatje/ |
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Stella*Nova
Vice Admiral 
Joined: 25 January 2004 Location: Lelystad / NL Status: Offline Points: 776 |
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Posted: 26 May 2008 at 13:44 |
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Many thanks Willem for sharing your experiences with us. So we can avoide situations like you had.
Kind regards
Ralf
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BR Ralf, Ex. 'a mare' H370
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copain
Captain
Joined: 10 August 2007 Location: Netherlands Status: Offline Points: 182 |
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Posted: 30 May 2008 at 22:44 |
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These are the spec's from the hoses. This information is from Ralco Tubings UK you can find on their website.
After a couple of mails the extra information I requested, like about vibration or the degradation with the increase of temperature never came. The same every time "All the info you can find on our website sir"
Their statement of "it should withstand a degree of vibration"I told them this was not good enough to me and then the same answer. "You can find all the information on our website sir".
Vetus sell the same tube. Their site is a bit more complete.
Pressure table
ID OD 20degr C 40 degr C 65 degr C Bend rad.
10 16 mm 7bar 5bar 3 bar 20mm
12 18 mm 7 5 3 25
16 22.4mm 6 4 2 35
20 26.8mm 5 3 2 50
30 38.4mm 4.5 3.5 1.5 70
32 40.4mm 4.5 3 1.5 75
35 44 4 2 1 80
38 47 4 2 1 90
40 49.4 3 1 0.7 95
45 55 3 1 0.7 110
50 60 3 1 0.7 125
The rest of the info in the Vetus cataloque is as follows:
Suitable for transportation of drinking and grey water on board, both suction and pressure. Made of transparent PVC with spiralled steel inlay
Tasteles and non-toxic. Temperature proof between -5 and + 65 degr C
So I mail Vetus and asked them if I could use this tube as an enginecooiling hose. Answer " We do not reccomend this" For cooling you should use our cooling water hose"
On page 88 and 89 of their digital cataloque you can find both hoses.
Regards, Willem
Edited by copain - 30 May 2008 at 22:47 |
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s/y Copain (Beneteau 281)
from march 2008 Hanse 350 # 061 Visit my BLOG op http://www.wsv-haringvliet.nl/blog/maatje/ |
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panos
Admiral 
Joined: 02 March 2008 Status: Offline Points: 1939 |
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Posted: 30 May 2008 at 23:10 |
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Hi,
We must be VERY CAREFUL with the engine cooling circuit. If you don't believe me look to my post: http://www.myhanse.com/forum_posts.asp?TID=2016&PN=2
Of course the same results (sinking) if one of the cooling tubes fails  .Edited by panos - 30 May 2008 at 23:15 |
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Panos
Hanse 630e - selling her - |
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Conundrum
Lieutenant 
Joined: 01 April 2008 Location: Ireland Status: Offline Points: 30 |
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Posted: 03 June 2008 at 14:30 |
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I see nothing about how the pipes stand up to an alkaline marine environment or the quality of the steel used in the reinforcement spiral. Someone else posted pictures of this steel rusting in places.
On a related topic does anyone have technical details of the 'Wesa' stop cocks. On our boat some of them have stainless steel nuts attaching the handles, while others are just cheap steel and already one is badly rusted. I think it is seeping slightly. The German site only has a photo: http://www.wesa-armaturen.de/produktsortiment.htm  Edited by Conundrum - 03 June 2008 at 14:32 |
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copain
Captain
Joined: 10 August 2007 Location: Netherlands Status: Offline Points: 182 |
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Posted: 03 June 2008 at 16:27 |
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Hi Conundrum,
The last mail I send to Ralco tubings was never answered at all.
I think that a company who does not care about answering enquiries is a bad company.
The pic you send in I suppose is from inside your bathroomcabinet?
The jubilee clips in our boat are like on yours sometimes double and sometimes single. On the Y-piece there is just not enough space to put two clips. I don't want to worry you to much but these plastic Y-pieces are total cr..... and from experience I know they break very easy.
I don't understand why you have a T-connector with a blank in there. The cutout in the inner scale looks like being done with a chainsaw or something.
I just had a look in my cabinet and there is no corrosion on the handles although they are also mild steel, but the nuts are ss.
It looks like somebody has been fiddling with silicone sealant on the
T- piece.
I suppose the area is very moist all the time because of a small leak somewhere.
I would say. Talk to your dealer !! because this is not going to last very long.
Regards, Willem
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s/y Copain (Beneteau 281)
from march 2008 Hanse 350 # 061 Visit my BLOG op http://www.wsv-haringvliet.nl/blog/maatje/ |
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Conundrum
Lieutenant
Joined: 01 April 2008 Location: Ireland Status: Offline Points: 30 |
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Posted: 05 June 2008 at 13:38 |
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Yes the photo is from the bathroom. The T has been used to extend the outlet through the inner skin. I think the stopcock is seeping slightly through the spindle. As for the chainsaw work I could show you more behind the cushions in the cabin |
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Conundrum - Hanse 350 #144
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Equinox
Sub Lieutenant 
Joined: 22 January 2008 Location: Great Britain Status: Offline Points: 11 |
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Posted: 20 July 2008 at 21:52 |
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RE leaking hot water hoses.
Have today had clear spiralreinforced hot water pipe to heads sink burst and pump large amount of hot water everywhere, luckily were able to pick up problem quickly and replace hose before much damage done.
It would appear on our boat this was the only section of clear spiral pipe been put in between main hot pipework under basin taken to hot tap as presumably it was easier to bend into position.We dont have this pipework to sink tap in galley.
The boat is only 2 months old and as the rest of you guys, not impressed!!! Edited by Equinox - 20 July 2008 at 21:59 |
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copain wrote:
But over all we are very happy with the boat.