myHanse.com - Hanse Yacht Owners Website myHanse.com - Hanse Yacht Owners Website myHanse.com - Hanse Yacht Owners Website myHanse.com - Hanse Yacht Owners Website

Welcome to myHanse.com the forum for Hanse Yachts owners throughout the world.

Forum Home Forum Home > Hints and Tips > 400
  New Posts New Posts RSS Feed - New seacocks/thru-hulls
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

New seacocks/thru-hulls

 Post Reply Post Reply Page  123>
Author
Message
Captain Cook View Drop Down
Commander
Commander
Avatar

Joined: 23 May 2006
Location: Denmark
Status: Offline
Points: 96
Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Topic: New seacocks/thru-hulls
    Posted: 20 January 2018 at 14:55
The old topic "Seacocks" is already discussed in detail, a search just now gave 100 results. In the old subjects you can find members who stubbornly claims, that at least their seacocks were made of bronze, and then after a test must admit that the yellow material is brass. Hanse werft has maybe not been completely honest to the owners who by telephone have been assured, that the thru-hulls and seacocks were made of bronze.
Later inquiries have earned an answer, that the material was DZR-brass, by some called "marine grade" brass. Brass is made by copper and zink, and the DZR has been added other metals to slow down the detoriation. The DZR was chosen because it is cheaper than bronze or Trudesign.

In the pictures below you can see my old thru-hulls, which when replaced after seven years in 2013, still had a pretty good look. I did not check if they were made of bronze.
My old ball-valves marked DN20 (Diametre Nominal), were the type your plumber mounts in your house (plain chrome-plated brass I suppose). Those were in my boat a bit rusty in the handles but otherwise seemed OK.

My decision to change the seacocks came after the horror stories in 2012-13, where several boats from many different shipyards had unwanted fountains in their boats.

The change from DZR to bronze or Trudesign is not that costly, so the Hanse-owners with a 8-12 years old ship should maybe change the seacock/thru-hulls now?
If not, I advise to buy wooden plugs to place near the "fountain-to-be".

This is not an attempt of mouth-to-mouth rescue of the old tread, but basicly an friendly advice
to the owners of old Hanses, which still have not changed their thru-hulls.

Regards Kjeld




Edited by Captain Cook - 16 February 2018 at 09:36
Freya Hanse400#27
Back to Top
StavrosNZ View Drop Down
Captain
Captain


Joined: 24 October 2014
Status: Offline
Points: 231
Post Options Post Options   Thanks (0) Thanks(0)   Quote StavrosNZ Quote  Post ReplyReply Direct Link To This Post Posted: 21 January 2018 at 21:38
Good move, i replaced all of mine on my 2010 400 a few years back and posted the process on the forum, its real piece of mind to know none of the DZR brass remains below the waterline.

The irony is that Trudesign fittings are cheaper than Brass particularly in the volumes Hanse would buy. Hanse now fit Trudesign skin fittings on all new boats but then fit DZR brass ball valves and tails to these. Hopefully at some stage they will go the whole hog and fit the full synthetic package, i as a prospective buyer would see this very favorably over other brands still using Brass.
Stephen
2010 H400, Auckland, New Zealand
Back to Top
Sea-U View Drop Down
Commadore
Commadore
Avatar

Joined: 14 September 2012
Location: Norway
Status: Offline
Points: 395
Post Options Post Options   Thanks (0) Thanks(0)   Quote Sea-U Quote  Post ReplyReply Direct Link To This Post Posted: 22 January 2018 at 09:49
I too changed all 2 years ago. I did not like the Trudesign 90 degree bend (in middle of picture). It was of a small inner diameter.
I then bought a stainless steel bend. I have now learned that this was a big mistake. Stainless steel can be worse than brass.
Have just received a bronse 90 degree bend for the black water. Hope I can change... or I might need to buy new seacock too.


Sea-U is a 370e #532 located SW Norway
Back to Top
Captain Cook View Drop Down
Commander
Commander
Avatar

Joined: 23 May 2006
Location: Denmark
Status: Offline
Points: 96
Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 22 January 2018 at 10:41
At the internet you can google hundreds of posts about corrosion of seacocks. The Danish Sailing Association homepage (http://www.sejlsport.dk/baadejer/praktisk-viden/skrog/skroggennemfoeringer/korrosion-i-skroggennemfoeringer) complains about EEC-directive 94/25EC, and links to a report from Piet Jansen, FORCE Technology (published 2004!)in danish. I will summarize some of his conclusions here.

Bronze (CC491-CuSn5Zn5Pb5=85%Cu,5%Sn,5%Pb) is corrosion safe in molded parts.

MS58 Brass (CW612N-CuZn39Pb2=59%Cu,39%Zn,1-2%Pb) is not corrossion safe.
(Prone to de-zinkification, vulnerable to strain-corrosion in salt water).

Special Brass (DNZ) (CW602N-CuZn36Pb2As=62%Cu,36%Zn,2%Pb,<1%As) is fairly corrosion safe.
It is vulnerable to strain corrosion.

Stainless steel AISI304 (A2) is not recommended.

Stainless steel AISI316 (A4) is better than MS58, but in 2-5 years come pitting and fissure corrosion.

Stainless steel SS254 is okay, but very expensive.

Jansen tells that a reddish colour in the yellow brass is a symptom of de-zinkification.

I just now discovered, that 94/25/EC is repealed, and instead as of January 18, 2016 a new directive 2013/53/EU is in force. 65 pages to study for the Hanse owner. I just skimmed the directive for any mention of seacocks, but I found no such thing. 









Edited by Captain Cook - 24 January 2018 at 13:06
Freya Hanse400#27
Back to Top
iemand View Drop Down
Vice Admiral
Vice Admiral
Avatar

Joined: 13 February 2004
Location: Germany
Status: Offline
Points: 838
Post Options Post Options   Thanks (0) Thanks(0)   Quote iemand Quote  Post ReplyReply Direct Link To This Post Posted: 22 January 2018 at 21:01
   I'm planning to change to true design on my 370 as well. What have you done on the SD50? TD is still missing a double nipple....
Hanse 312 MJ 2004 - Hanse 370e MJ 2007
Back to Top
Sea-U View Drop Down
Commadore
Commadore
Avatar

Joined: 14 September 2012
Location: Norway
Status: Offline
Points: 395
Post Options Post Options   Thanks (0) Thanks(0)   Quote Sea-U Quote  Post ReplyReply Direct Link To This Post Posted: 22 January 2018 at 21:30
When I changed mine 2 years ago, the piece that is in the hose was totally gone. The hose almost fell of by itself. I was just lucky ... and the boat is from 2008.
The other parts were reddish halfway through.

So iemand !!! You should start to be worried!
Sea-U is a 370e #532 located SW Norway
Back to Top
StavrosNZ View Drop Down
Captain
Captain


Joined: 24 October 2014
Status: Offline
Points: 231
Post Options Post Options   Thanks (0) Thanks(0)   Quote StavrosNZ Quote  Post ReplyReply Direct Link To This Post Posted: 22 January 2018 at 21:45
yes i did the valve on SD50 as well including glass filled nylon male to male to connect the ball valve to the saildrive. 4 years no problems, see mt earlier posts:

http://www.myhanse.com/sd20-saildrive_topic9673_page2.html

Stephen
2010 H400, Auckland, New Zealand
Back to Top
StavrosNZ View Drop Down
Captain
Captain


Joined: 24 October 2014
Status: Offline
Points: 231
Post Options Post Options   Thanks (0) Thanks(0)   Quote StavrosNZ Quote  Post ReplyReply Direct Link To This Post Posted: 22 January 2018 at 21:49
used glass filled nylon male to male made by hansen, see www.hansenproducts.co.nz, used Sika 291 on both threads fitted when cold.
Stephen
2010 H400, Auckland, New Zealand
Back to Top
Rubato View Drop Down
Admiral
Admiral
Avatar

Joined: 12 July 2006
Location: Canada
Status: Offline
Points: 1703
Post Options Post Options   Thanks (0) Thanks(0)   Quote Rubato Quote  Post ReplyReply Direct Link To This Post Posted: 23 January 2018 at 17:53
I know very little about the TruDesign product and the material it is made out of. Is there a greater chance of getting cracking from water freezing in cold weather versus a metal part? The basin where the boat is moored is fed by a fresh water creek making the top layer much much less salty and it freezes easily in the winter.
Steve

Hanse 400e, #168
Back to Top
Captain Cook View Drop Down
Commander
Commander
Avatar

Joined: 23 May 2006
Location: Denmark
Status: Offline
Points: 96
Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 23 January 2018 at 18:24
Nippel in bronze from http://tempobaadudstyr.dk

Freya Hanse400#27
Back to Top
 Post Reply Post Reply Page  123>
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 11.04
Copyright ©2001-2015 Web Wiz Ltd.

This page was generated in 0.031 seconds.

Links : www.hanseyachts.co.uk www.hanseyachts.com www.fjordboats.co.uk www.dehler.co.uk www.varianta.co.uk