DDoug
Formerly digger doug
How do you dump pressure when done ?
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Anyone familiar with UN T50 LPG ISO’s?
- Thread starter Coaldust
- Start date
Shimmy1
Senior Member
I'd guess there's a bleeder on the other end, have to get all the air out before you can start the test. Probably a nearly identical procedure to testing fire hose, except different pressure. We test most of our attack line to 300 psi.
Coaldust
Senior Member
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- Big trucks is what I know. HAZMAT is what I tow.
Yeah. I put a ball valve on the opposite end.
Interesting you mentioned fire hose testing. I was just looking at the test apparatus they use. That would be more convenient. Especially, if I was doing these in bulk.
Interesting you mentioned fire hose testing. I was just looking at the test apparatus they use. That would be more convenient. Especially, if I was doing these in bulk.
Shimmy1
Senior Member
Same pump.
Welder Dave
Senior Member
Worked at a tank shop where one of the foreman made a major boo boo. Hydrotesting a 750bbl tank with studs welded on to hold insulation. Everything that needs to be welded on has to be done before hydrotesting. Filled the tank with water and testing went fine. Told a labourer to let the water out. Big mistake! Forgot to remember that the pressure needed to be released first. Water came out alright. It also sucked the head of the tank in! Expensive mistake!
Coaldust
Senior Member
- Joined
- May 9, 2011
- Messages
- 6,045
- Location
- Subarctic Backwoods Trailer Park
- Occupation
- Big trucks is what I know. HAZMAT is what I tow.
Woooooosh. My goodness.
Welder Dave
Senior Member
It was one of the most expensive tanks they made. Most are just air tested to 1.5 to 2 PSI. That doesn't seem like much but if you walk by when the air is being let out of a 1" or smaller valve you'd swear it was like letting 100 PSI out of a compressor. 400bbl were the most common size. I built a couple hundred hooped safety ladders for 400bbl tanks. Longest ladder was 58' and they lost it. I think the 2 sections got used on another tank so I had to make another 58 footer. Not the only time I had to make another ladder. A bed truck came to pick up a 400bbl tank and when the driver winched the tank over on it's side forgot about the ladder on the far side and mangled it. I got a little sick of building ladders but it was a pretty good job as a first year apprentice right out of high school. I got out of school early because I was offered the job. My welding teacher said I should take the job and don't need to stay till schools out. My grades were good. Lots of apprentices just do crappy jobs like grinding and hardly do any welding the first year.