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DEF stuff

cfherrman

Senior Member
Joined
Jun 3, 2022
Messages
1,664
Location
Hays, Kansas
I've been hauling water last few months. It's a 80 bbl tank or around 3400 gallon tank, used vac or pressure to load or unload. When unloading the tank can get to 20+ psi, it's quite a bomb.
 

Welder Dave

Senior Member
Joined
Oct 11, 2014
Messages
12,257
Location
Canada
Interesting that back before I was a journeyman welder the owner of an irrigation company asked me about building a water fountain. My dad was responsible for him getting the Toro irrigation distributorship because it was offered to my dad. My dad was offered the distributorship but wanted to concentrate on the turf equipment so recommended him to Toro. He never forgot is why I was asked about building the water fountain. Unfortunately I just didn't have enough experience to build it so had to decline. One of the reasons he asked me was because a commercial welding shop they've used in the past lied to him on a job they did. They made some kind of smaller non pressure tank and when asked if it was tested said "Sure we put 20 PSI air pressure in it and tested with soapy water". My dad's friend knew right away that was a crock of $hit! It shouldn't have had more than 5 PSI and 2 or 2.5 would have been sufficient.
 

Coaldust

Senior Member
Joined
May 9, 2011
Messages
3,286
Location
North of the 60
Occupation
Cargo Tanks, ULSD, RUG, Methanol, LPG
CFherrman,

Those DOT412 spec tanks are rated for MAWP of 35 psi. I’ve never really messed with them. Not many of them in hazmat service in my area.
 

Coaldust

Senior Member
Joined
May 9, 2011
Messages
3,286
Location
North of the 60
Occupation
Cargo Tanks, ULSD, RUG, Methanol, LPG
That’s a good idea and practice. I ran into a Canadian outfit that uses nitrogen. That’s too Gucci for me.
 

Welder Dave

Senior Member
Joined
Oct 11, 2014
Messages
12,257
Location
Canada
BE dragline booms were filled with nitrogen to alert operators of cracks. Nitrogen also prevents corrosion. Have read that Cat used a special corrosion inhibitor in later dry steering clutch compartments and pressure tested them for leaks. Yesterday read something that said nitrogen fumes prevent corrosion so thinking that might be what Cat used from the factory. Has baffled me for a while because nobody seemed to know of a corrosion inhibitor for clutch compartments.
 

JaredV

Senior Member
Joined
Jan 22, 2022
Messages
331
Location
SW WA
Rust requires oxygen, thus the term oxidization, so if the nitrogen displaces the oxygen, there you are. It's not uncommon for old barges to be bright steel on the inside if they were sealed up properly when launched. The oxygen gets used up and the rusting stops. But you'd better make sure it's well ventilated before you go in there!
 
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