Why it's a good idea to wash your gear in fresh water

Talk about vintage tanks and valves. Hydro and VIP testing, cleaning, painting, coating, Valve parts and repair.

Moderators: Herman, captain

User avatar
ScubaLawyer
Master Diver
 
Posts: 570
Joined: Thu Apr 08, 2010 11:25 am
Location: Laguna Beach, CA

Why it's a good idea to wash your gear in fresh water

Tue Sep 12, 2017 6:33 pm

Found floating off Dana Point, CA. :shock:
Tank 1.jpg

Tank 2.jpg
You do not have the required permissions to view the files attached to this post.

User avatar
luis
VDH Moderator
 
Posts: 1478
Joined: Thu Jun 30, 2005 9:28 pm
Location: Maine

Re: Why it's a good idea to wash your gear in fresh water

Tue Sep 12, 2017 9:54 pm

Does it have air?

My LDS had an aluminum cylinder that a local fishing vessel brought aboard on its net. It was full (or close to full), but it wasn't going to be for long. The walls were heavily pitted. It was impressive that it hadn't started leaking or let go yet.
Luis

Buceador con escafandra autónoma clásica.

User avatar
ScubaLawyer
Master Diver
 
Posts: 570
Joined: Thu Apr 08, 2010 11:25 am
Location: Laguna Beach, CA

Re: Why it's a good idea to wash your gear in fresh water

Tue Sep 12, 2017 10:19 pm

luis wrote:Does it have air?.


No clue. Didn't check it. Got donated to my LDS

kworkman
Master Diver
 
Posts: 327
Joined: Thu Aug 08, 2013 4:17 pm
Location: Columbus, OH

Re: Why it's a good idea to wash your gear in fresh water

Wed Sep 13, 2017 12:01 am


swimjim
Master Diver
 
Posts: 1341
Joined: Thu Mar 23, 2006 12:28 am
Location: Belgium WI

Re: Why it's a good idea to wash your gear in fresh water

Wed Sep 13, 2017 11:16 am

One of the reasons I love Lake Michigan. Fresh water. I was on a dive boat about ten years ago. The captain saw something on the sonar and stopped to have a diver check it out. The mark turned out to be nothing, but embedded in the lake bottom was a AL 80 with an old style back pack on it. It must have fallen off a boat a few years before. The tank still had air in it. The diver cleaned up the tank and it passed hydro and went back into use!

crimediver
Master Diver
 
Posts: 391
Joined: Tue Jul 12, 2005 7:38 am
Location: Richmond, Va

Re: Why it's a good idea to wash your gear in fresh water

Wed Sep 13, 2017 7:57 pm

I would be scared that could be an explosion waiting to happen. I would drill a very small hole through the burst disk to vent it and see what it does...

User avatar
luis
VDH Moderator
 
Posts: 1478
Joined: Thu Jun 30, 2005 9:28 pm
Location: Maine

Re: Why it's a good idea to wash your gear in fresh water

Wed Sep 13, 2017 11:01 pm

crimediver wrote:I would be scared that could be an explosion waiting to happen. I would drill a very small hole through the burst disk to vent it and see what it does...


I like that idea.

The smaller the hole the better, but just to give some reference of the pressure thrust (force) on the small drill bit.

An 1/8” (0.125”) hole has an area of 0.01227 inches squared.
Multiply by 3000 psi and you have a pressure force of 36.8 pounds.

An 1/16” (0.0625” ) hole has an area of 0.00307 inches squared.
Multiply by 3000 psi and you have a pressure force of 9.2 pounds.

The head of the burst disk screw has no pressure load. The actual thin disc may let go, but the head of the screw should control gas escaping.

You should never drill (even a very small hole) on the actual wall of the pressure vessel. The hole could become the trigger to a structural failure.
Luis

Buceador con escafandra autónoma clásica.

User avatar
Herman
VDH Moderator
 
Posts: 1089
Joined: Thu Oct 25, 2007 1:45 pm
Location: Raleigh NC

Re: Why it's a good idea to wash your gear in fresh water

Thu Sep 14, 2017 6:59 am

How about drilling a .308 hole......from 100 yards away? A 30-06 should do nicely. :)
Herman

User avatar
simonbeans
VDH Moderator
 
Posts: 838
Joined: Sat Jun 25, 2005 2:00 pm
Location: Rochester NY

Re: Why it's a good idea to wash your gear in fresh water

Thu Sep 14, 2017 9:06 am

Herman wrote:How about drilling a .308 hole......from 100 yards away? A 30-06 should do nicely. :)

It worked for Chief Martin Brody.
Check out my website: www.vintagescubastuff.com

User avatar
georgeaustin
Master Diver
 
Posts: 246
Joined: Mon Nov 04, 2013 8:41 am
Location: Los Angeles CA

Re: Why it's a good idea to wash your gear in fresh water

Thu Sep 14, 2017 8:37 pm

When you get the o ring out from under the valve, let me know - I need one

hunterkz
Diver
 
Posts: 18
Joined: Wed Jan 25, 2017 8:40 pm
Location: East Greenbush NY

Re: Why it's a good idea to wash your gear in fresh water

Fri Sep 15, 2017 4:05 pm

I would have eaten those scallops before I got rid of it. I like the 308 diameter hole idea too.

Return to Tanks and Valves

Who is online

Users browsing this forum: No registered users and 3 guests