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Re: Air Compressor [Re: rickmg] #1302769 Tue Mar 12 2019 02:54 PM
Joined: Nov 1995
Posts: 4,161
John Milliman Offline
Founder/Developer
Safety Committee??? We don't need no stinking safety committees!


John

'49 Chevrolet 3804
'70 Boston Whaler Sakonnet w/ '84 Evinrude 90
'85 Ford F-350 "The Farm Dawg"

Re: Air Compressor [Re: Hotrod Lincoln] #1302824 Wed Mar 13 2019 12:07 AM
Joined: May 2015
Posts: 1,355
K
klhansen Offline
Shop Shark
Originally Posted by Hotrod Lincoln
I've welded a bunch of fuel tanks- - - -even did a braze fix of a fuel fitting leak on top of one about half full of gas one day. The trick is to totally fill the interior of the tank with a non-flammable gas like nitrogen, CO2, or even exhaust gas from a very rich-running engine. No oxygen to support combustion- - - - -no kaboom. Pressure vessels don't have to have a fire to do damage- - - -the fracturing of the metal itself is the dangerous part.
Jerry

I haven't welded a fuel tank, but I supervised welding one from a gasoline engine M88 tank recovery vehicle (probably over 100 gal capacity). We filled it with water nearly to the level of the crack that needed welding, then discharged 2 CO2 extinguishers in it. When the welder touched the arc, it gave a little "boomp", at which point I told him to keep welding, as all the fuel had been consumed.
The problem with air tests on tanks or piping is that the air is compressible and thus stores energy. Water (hydrostatic test) on the other hand is incompressible, and the only energy stored is in the slight flexibility in the tank steel itself. Any rupture of the tank reduces the pressure nearly immediately, so no explosion.
Overheated water heaters, developing steam inside, however, can turn into rockets, and have destroyed housed in the process of exploding. Mythbusters did a video of one where they plugged the relief valve and let it cook. It took off and flew about 100 ft in the air thru two floors of the test house they had it in. Didn't find that one, but here's a video of one they did out in the open. Water Heater Rocket Pretty exciting, but sobering too if you think about the damage it could cause.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos
Re: Air Compressor [Re: rickmg] #1302827 Wed Mar 13 2019 12:17 AM
Joined: Oct 2005
Posts: 2,650
MNSmith Offline
"Hey! I sound like Darth Vader!!
Can we start a new competition similar to chunkin pumpkins?

Re: Air Compressor [Re: rickmg] #1302834 Wed Mar 13 2019 01:17 AM
Joined: Feb 2004
Posts: 18,999
H
Hotrod Lincoln Online
Boltergeist
I- - - -errr- - - - -a "friend'" used to have fun with a length of water pipe, hair spray, and tennis balls. The cops got called on a regular basis in "his" neighborhood about somebody setting off bombs!
LOL!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Air Compressor [Re: rickmg] #1302848 Wed Mar 13 2019 01:55 AM
Joined: Sep 2013
Posts: 814
M
moparguy Offline
Shop Shark
Jerry, I once knew a guy.....used potatoes and hair spray and 3" PVC sch. 80 pipe to create diversions on hot summer days when more like minded juvenile old guys would gather to enjoy beverages shoot the bull,,,,er spud.


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A



Re: Air Compressor [Re: John Milliman] #1302849 Wed Mar 13 2019 02:00 AM
Joined: Mar 2010
Posts: 8,315
5
52Carl Offline
Master Gabster
Originally Posted by John Milliman
So Jerry ... Would welding a patch in a fuel tank be bad, too, then???

eeeek

You just need to know when to jump out of the way...
Notice the mountain lion-like way this gentleman has positioned his rear legs. Ready to pounce instantly right out of danger's way.

Re: Air Compressor [Re: rickmg] #1302852 Wed Mar 13 2019 02:25 AM
Joined: Sep 2013
Posts: 814
M
moparguy Offline
Shop Shark
klhansen, good summery concerning hydro vs pneumatic testing and the dangers. My last pipeline project (I sorta retired/kinda in '15) we used nitrogen to test 30 mile sections of 16". A less than capable contractor let ditch water freeze in the pipe by not back filling trench at tie-ins. This caused a major problem (in sub zero degree weather) in clearing the ice so the line could be pigged prior to testing. Then the company construction VP was convinced water was bad, nitrogen was good. As project manager I could not change his mind, so we tested with nitrogen. The spread was 2050 psig to 2225 psig. I was definitely one nervous country boy while on test. I promised the wife I would not get within 300' of "on test pipe". Of course that didn't work but thankfully all went according to plan.

Always use water to pressure test!!

Last edited by moparguy; Wed Mar 13 2019 02:26 AM.

1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A



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