Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 04-01-2010, 11:31   #1
Registered User

Join Date: Jan 2010
Location: Currently in Guatemala
Boat: Saga 43--VoltAire
Posts: 2
What Gasket Material for Diesel Tank Inspection Port ?

I am new to this forum and recently cut inspection ports into my aluminum fuel tanks. I had aluminum plates fabricated but not sure what material to use as a gasket. Rubber comes to mind, but not sure if rubber with work with the new diesel formulations. What have others used?
__________________

__________________
Capt.Zula is offline   Reply With Quote
Old 04-01-2010, 12:11   #2
Registered User
 
cdennyb's Avatar

Join Date: Jun 2007
Location: Northern California
Boat: finally a catamaran dive boat...
Posts: 505
Send a message via MSN to cdennyb Send a message via Yahoo to cdennyb Send a message via Skype™ to cdennyb
TRY TO GET AHOLD OF SOME "EPDM rubber". It's pretty impervious to any fuel and/or additives. My second choice would be a sheet of Viton/Buna-N but it'd be pretty pricey. The EPDM should cost about $18.00/sq ft in a .100 thickness.
Mcmaster Carr has some
Buna-N Material in sheet form: PN#1890T14 12" x 12" x 1/8" $23.00
epdm sheet: PN#8985K44 12" x 12" x 1/8" $18.15

OH, welcome to the board. It'll be fun.
__________________

__________________
the perfect dive boat is one you're on...
cdennyb is offline   Reply With Quote
Old 04-01-2010, 12:52   #3
sitting on the dock of the bay

Join Date: Mar 2006
Posts: 1,513
Images: 6
Send a message via Yahoo to gonesail
what he said: nitrile rubber or Buna-N
__________________
sometimes the things that may or may not be true are the things a man needs to believe in the most.
gonesail is offline   Reply With Quote
Old 04-01-2010, 13:08   #4
Senior Cruiser
 
S/V Antares's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: Annapolis, Bahamas
Boat: 1983 Gulfstar 36
Posts: 1,249
Images: 1
Also Be sure to use fiber washers on the flange bolts or better yet if you have blind fasteners (The screws do not enter the tank) as diesel will find its way out and smell. At least goop them (The screws) up with a non hardening fuel approved sealer when installing the plate. Auto part store stuff, easy to find. If you are in Guatemala as your location notes do not let anyone talk you into using an old innertube as a gasket. Hold out for the real thing (Buna/Nitrile). BTDT
__________________
Will & Muffin
Lucy the dog

"Yes, well.. perhaps some more wine" (Julia Child)
S/V Antares is offline   Reply With Quote
Old 24-09-2010, 07:23   #5
Registered User

Join Date: Sep 2010
Posts: 2
Nitrile Rubber

I do not believe that EPDM rubber is the best to use with fuel, and viton is a very expensive material.

Nitrile is the cheapest material that will do the job. You want a sheet of nitrile gasket material.

Over and out,

Jamus
__________________
RAMGas10 is offline   Reply With Quote
Old 24-09-2010, 07:57   #6
Registered User
 
Christian Van H's Avatar

Join Date: Oct 2008
Location: Princeton, NJ
Boat: Challenger Anacapa 42
Posts: 2,097
Images: 57
Quote:
Originally Posted by gonesail View Post
what he said: nitrile rubber or Buna-N
This is exactly correct. granger.com has it if you can't find it cheaper...
__________________
www.anacapas.com

Here's to swimmin' with bowlegged women!
Christian Van H is offline   Reply With Quote
Old 24-09-2010, 08:14   #7
Registered User
 
ShipShape's Avatar

Join Date: May 2010
Posts: 267
Although diesel fuel is an "oil", it is also an interesting solvent, and this is one item you need to forget about the price and get the correct product: Buna-N.

This summer replacing the 27-year old fuel fill and vent hoses finally made it to the top of The List. I wanted to have the tanks empty for that, and when I removed the first inspection hatch - ooooh - some #%*@ dimwit had used a diesel-soluble gasket material, which was in the process of merrily dissolving. Quite a few gooy soft chunks fell into the fuel when I pulled off the cap. To say that cleaning up that nasty mess was a PIA is a tad of an understatement.

It is hard to find, I got mine from from McMaster-Carr. Since my tanks are fiberglass I went with 3/16" to insure that they would completely conform to the rough, uneven surface. If your tank's port is smooth and even probably 1/16" is sufficient.

The Buna-N cuts easily with scissors, but you will need a punch to make the bolt holes (also available at MMC). I made my bolt holes a little bit larger than the bolts. Also, since the bolt holes are not uniformly spaced I left one of the corners on to mark the orientation of how the gasket fits on the tank.

Click image for larger version

Name:	gasket.JPG
Views:	719
Size:	80.4 KB
ID:	19556
__________________
ShipShape is offline   Reply With Quote
Old 24-09-2010, 21:29   #8
Eternal Member
 
Chief Engineer's Avatar

Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
I just love smart people....good idea!!!!!!!!!!!!!
__________________
Chief Engineer is offline   Reply With Quote
Old 25-09-2010, 00:01   #9
Registered User
 
sww914's Avatar

Join Date: May 2009
Location: Punta De Mita
Boat: Vagabond 39 Hull # 1
Posts: 1,842
Quote:
Originally Posted by Chief Engineer View Post
I just love smart people....good idea!!!!!!!!!!!!!
DITTO!
Thanks for sharing that good idea. I will use it and look smart too.
Of course, I will lie and say I thought of it myself.
__________________
sww914 is offline   Reply With Quote
Old 25-09-2010, 05:17   #10
Registered User

Join Date: Jun 2005
Posts: 1,901
5200 or
http://www.permatex.com/products/aut...sket_Maker.htm

work well with Aluminum also
__________________
never monday is offline   Reply With Quote
Old 25-09-2010, 06:10   #11
Registered User
 
ShipShape's Avatar

Join Date: May 2010
Posts: 267
Dude! You're gonna have a lot of Mondays with 'solutions' like that. 5200?! Of course I could be wrong, but I think Capt.Zula cut inspection ports into his tank because he would like to look inside his tanks more than once.

As for the Gasket Maker, that would be great if you could give it a try and let us know if it is diesel-soluble or not.
__________________
ShipShape is offline   Reply With Quote
Old 25-09-2010, 06:25   #12
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,571
Images: 240
Quote:
Originally Posted by ShipShape View Post
Dude! You're gonna have a lot of Mondays with 'solutions' like that. 5200?! Of course I could be wrong ...
Indeed dude, you could be wrong.

Pat probably expects we’ll lay a bead of 5200 on one part only (tank OR port cover), let it cure fully , and only then mate the parts, closing the tank.


However, diesel fuel softens and damages polyurethane adhesive sealants, such as Sikaflex 296 and 3M 5200.

Polysulfide (Thiokol) sealants, such as 3M “101" or Boatlife “Life Calk”, are most often used in conjunction with diesel & gasoline fuel systems.

See also ➥ Fuel Tank Acces Ports
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 25-09-2010, 06:35   #13
Registered User
 
rusky's Avatar

Join Date: Aug 2009
Location: Queensland
Boat: Peterson 46
Posts: 340
Images: 6
A year ago, I had to redo mine and only had what was at hand which was neoprene rubber and loctite. 12/12 on and it looks good. Can you guys who know what you are doing, tell me if this combo on a ss tank is OK?
__________________
rusky is offline   Reply With Quote
Old 25-09-2010, 10:43   #14
Registered User
 
ShipShape's Avatar

Join Date: May 2010
Posts: 267
ABYC Standard 33.18.1 for diesel fuel tanks:

"All materials used shall be resistant to deterioration as a result of contact with diesel fuel and other liquids or compounds with which the material may normally come in contact under normal operating conditions, e.g., grease, lubrication oil, common bilge solvents, and salt or fresh water."

Buna-N meets this standard.

In the "Findings and Recommendations" section of a survey report, fuel system deficiencies are usually reported under "Safety Deficiencies and Federal Violations". If you are using a gasket material that does not conform to the ABYC standard, in the event of a fuel mishap it is likely that your insurance company will find you negligent and will not cover you.
__________________
ShipShape is offline   Reply With Quote
Old 25-09-2010, 11:20   #15
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,571
Images: 240
My original post (#12) was poorly composed, for which I apologise.
I replied to ShipShape’s apparent objection to polyurethane, being it’s incredible tenacity (stated post #11); and under emphasised the true objection to 3M “5200" (in this application), being it’s incompatibility with fuel.
ShipShape’s post #14 is absolutely accurate (IMO).
__________________

__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Reply

Tags
gasket

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Gasket Material for Hatches, Lockers, etc. off-the-grid Construction, Maintenance & Refit 0 08-07-2009 13:17
Port hole gasket materiel wolfenzee Construction, Maintenance & Refit 2 29-08-2008 20:12
Hatch/locker Gasket Material ksmith Construction, Maintenance & Refit 2 18-09-2007 05:37
Diesel tank material irwinsailor Construction, Maintenance & Refit 40 19-01-2006 00:20



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 21:44.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.