Petrol/gasoline/ethanol

Discussion in 'Materials' started by gtflash, May 30, 2017.

  1. gtflash
    Joined: Jun 2006
    Posts: 114
    Likes: 0, Points: 16, Legacy Rep: 10
    Location: uk

    gtflash Senior Member

    I have been plagued by a grp tank issue for a while. I replaced gaskets and hoses but still get water in my grp in built tank. Layup is a derakane resin and resisting the fuel very well, but has a hole I have disovered in the roof.

    I've asked around local suppliers and have only found two resins that the manufacturer is willing to state they are petrol safe. Despite the searching on this site I am still confused if either will fit the bill.

    5kg Vinylester Resin (Atlac 580) http://www.cfsnet.co.uk/acatalog/5kg-Vinylester-Resin--Atlac-580--RVE580_005.html#SID=252

    EP 575 https://www.alchemie.com/epoxy-resin/laminating-resin/4840.html

    Both are confident in their product. I wonder if anyone has any experience or could explain the chemical resistance tables to me please.
     
  2. gtflash
    Joined: Jun 2006
    Posts: 114
    Likes: 0, Points: 16, Legacy Rep: 10
    Location: uk

    gtflash Senior Member

    I have found out the first resin is bisphenol A vinyl ester urethane resin.

    The second a novolac epoxy. I will use this one to repair
     
  3. Ike
    Joined: Apr 2006
    Posts: 2,044
    Likes: 134, Points: 63, Legacy Rep: 1669
    Location: Washington

    Ike Senior Member

    I have no experience with their product, but I do have experience with GRP gasoline tanks leaking. I would replace it completely if possible with a metal or rotomolded plastic tank.

    You said; "grp in built tank." Does this mean the tank is integral to the hull, or is it freestanding? In the US Canada and the EU integral gasoline tanks are not permitted because of the danger of a hull puncture releasing gasoline.
     
  4. PAR
    Joined: Nov 2003
    Posts: 18,583
    Likes: 374, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    I'd be very surprised if the tank was integral to the hull, for the reasons you've mentioned Peter. I too would recommend replacement though any of the major epoxy formulators and the discount formulators, will have an appropriate goo. Most of the usual formulations are very resistant to petrochemicals in general.
     
  5. Ike
    Joined: Apr 2006
    Posts: 2,044
    Likes: 134, Points: 63, Legacy Rep: 1669
    Location: Washington

    Ike Senior Member

    I'm sure you're right PAR. But replacement is a better solution. It will last far longer and eliminate the problem. On an older boat the new tank will outlive the boat.
     
  6. PAR
    Joined: Nov 2003
    Posts: 18,583
    Likes: 374, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Agreed and most professionals will likely insist, if only for liability issues. Tanks are cheap and come in about every shape and size, so . . .
     
  7. gtflash
    Joined: Jun 2006
    Posts: 114
    Likes: 0, Points: 16, Legacy Rep: 10
    Location: uk

    gtflash Senior Member

    Thanks all for replies. The boat was built in 2001/2 and at the time the manufactur used the hull as one side of the tank. Only in the last two years have they changed this to stainless tanks being bedded in to the hull due to changes in uk regs. Summer is upon me so I was after a quick fix, and a new tank will most likely be done in winter. I have fitted an external tank but would still like to repair internal tank to stop accumulation of water, and keep it as it was made if possible.
     
  8. Ike
    Joined: Apr 2006
    Posts: 2,044
    Likes: 134, Points: 63, Legacy Rep: 1669
    Location: Washington

    Ike Senior Member

  9. gtflash
    Joined: Jun 2006
    Posts: 114
    Likes: 0, Points: 16, Legacy Rep: 10
    Location: uk

    gtflash Senior Member

    I am not an rcd expert but I thought that was for new builds. Probably why the manufacturer changed tank design, however they must have made 200+ boats with a built in tank, if rcd had to be retrospectively fitted to all boats that no longer meet requirements that would have a massive impact on the whole 2nd hand market.

    If the boat coaded for passenger service it might be an issue.

    I like the plastic tanks in the US but the postage is usually crazy
     

  10. Ike
    Joined: Apr 2006
    Posts: 2,044
    Likes: 134, Points: 63, Legacy Rep: 1669
    Location: Washington

    Ike Senior Member

    As you said, I am not an expert in the RCD. Yes, the postage would be huge. Are they not available in the UK?
     
Loading...
Similar Threads
  1. UAE marine
    Replies:
    3
    Views:
    4,982
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.