Some idiot capped a hose that had some gasoline in it. We cap our diesel hoses, which still buil a bit pressure in the sun, but gasoline should just be allowed to quickly evaporate - a capped gasoline hose can knock out teeth or break a nose
The residual turned into vapor and pressurized 8n the hose. We cap it off because if we dropped diesel that shit would make a mess on the apron.
It's always fun to see how far the cap can shoot. I got one stuck on the catwalk once. As long as you're not aiming at your face, you're golden
We had to pressure test our hoses @ 100 psi and had to hold for ten minutes. One time for the fuck of it, we decided to launch one of the caps without depressurizing the hose fully. It was never found and we quickly cleaned up and left the area. This was in a navy shipyard. Good times.
Ironically, mine wasn’t even something as dangerous as this. Cap on a tote full of chemicals heated up and expanded till the cap I twisted off flew way the fuck away 😂 I’m glad I wasn’t near it or I’d have chipped a tooth.
Not really the hard way, I know enough to not look down the business end of a loaded gun lol. I had one pop like those once but I launched it into the parking lot lol
Are you capping your hoses after unloading gasoline? I only cap them after unloading diesel. Gasoline vapors expand with the heat and pressurize the hoses if capped. Just drain them well after unloading.. cap them after diesel, don’t cap them after gas..
Do you haul gasoline?, if so you know with higher temps with just vapors you’ll build pressure in those hoses we always drilled a small relief hole in the caps
You get the opposite in food grade tanker with freshly washed hoses. They wash them out with hot water and then put caps on them right away. The hose cools off creating a slight vacuum inside, making it difficult to remove the caps later.
If I had to guess the residual fuel in the hose evaporates and increases the pressure in the hose so when you release the cap all that pressure has a easy way out and launches that cap
To be clear, the build up is in the mostly empty hose, not in the tank in this case. There can also be positive pressure in the tank, which is relieved through the venting system when you open it. But the tank pressure has a valve that lets some vapor out if it gets too high, and the hose doesn't. So if you leave just the right ratio of gasoline and air in the hose, and shake it up real good and make the air warmer than what you put in, you can get a straight up canon.
It's about a liquid turning into a gas, it creates a tremendous amount of pressure because the liquid expands.
If you want to see the effect better, try going into cryogenics. it's easier to see because the boiling point is in the negative 300 range, that means the pressure build up is instant, it's why all hoses and tubing have pressure relief valves.
Don’t cap a hose that had gas unless it has residual from pump off. I learned the hard way on a really hot day with a capped 4 inch hose that I last used for a gasoline drop.
I used to haul peroxide and we had to do that occasionally. It was basically like soda shaken up in a bottle, it would pressurize a little.
They eventually figured it out and drilled 4mm weep holes in the caps/plugs.
😂 it wasn't fuel but I once had a customer opening up his lines hose pointing it directly at me and it struck me hard enough that my safety glasses flew off at about 10 ft away
Could be change in temperature in the tank. Higher temp would allow more liquid to become vapor which takes up more space (expands), creating pressure.
Next could be a change in altitude. If you go from a high pressure/ low altitude to a high altitude/low pressure, the air in the tank was pressed down more at low altitude then as you increase altitude that pressure is relieved and the air can expand.
Similarly, if you filled up in a high pressure weather system where barometric pressure was high, but then delivered to a low pressure area, even at the same altitude, the air in a sealed container can expand.
I don't truck. So answer me this. Why do these trailers not have a safety pressure relief valve? Seems like it would be standard.
Also, if it's just the hose, it may be avoided by leaving the cap slightly loose so that air can regulate as you travel. But you know your system better than I do.
Yup learned that the hard way, never EVER hold the hose between your legs and look down at the cap when you loosen it.
That trip to the ER was unpleasant.
My diesel aux tank builds up pressure when its hot outside as well. Not alot but definitely a hiss when I open the breather before I open the drain valve
I don't haul fuel, at least not the way you guys do, but the same thing applies in a tanker at the airport. I drive 10k tankers and hook up to 380's and 737's. We have to relieve pressure on the tanks (open them) prior to opening the fueling valve, because it can damage the fueling lines. It also works the same way at the end of fueling. When closing a tank let go of the deadman, the pressure buildup can damage the tanks.
Same thing at the farm when refueling. Sometimes after hooking up the scully, and trying to put on the single point, the valve on the single point won't open because of build up of vapor, so we open up the relief valve on the truck instead. Problem solved.
Not the tank, as he’s hooking up to the truck after, but the hose itself.
Residual fuel vapors plus heat equals expansion, but in a non-expanding volume (like a sealed semi-rigid hose), that means pressure. Just like leaving a half-full gas can in the sun while you’re mowing.
Happens during the day, the fuel inside pressurizes the hose, so when you pop the cap off, they launch. I worked nights on gas, so this was rare for me.
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