Thread: Fuel tank collapsed under Vaccuum. Replace or Repair??

water does not compress so when added presure is applied it wil not explode.

Air compreses and the amount of air under compresion wil be far more than the tanks volume so could expode if there is a fracture in it.

fill with water then use air
]]
Michael.

Originally posted by HSVRangie
water does not compress so when added presure is applied it wil not explode.

Air compreses and the amount of air under compresion wil be far more than the tanks volume so could expode if there is a fracture in it.

fill with water then use air
]]
Michael.

I beg to differ. True water is virtually incompressible, however, whether you leave the tank empty, put in a teaspoon of water or half fill it then apply compressed air, the pressure in the tank will be the same for the same applied air pressure ... pump it up to say 10psi, it will be at 10psi, regardless of the contents. The surface of the water will be under 10psi pressure, which gives the same pressure everywhere throughout the tank. You cannot achieve a pressure gradient within a confined space, such as this.

Cheers

ok. has anyone blown the tank back out???
of is it safe to say it will explode??? with compressed air NOT OXEGEN

i think mine has ruptured as it is leaking, i'm hoping its just the Bung, but id say it wont be.

Originally posted by sclarke
ok. has anyone blown the tank back out???
of is it safe to say it will explode??? with compressed air NOT OXEGEN

i think mine has ruptured as it is leaking, i'm hoping its just the Bung, but id say it wont be.

I'd say it's stuffed. If it's like the steel tank I had in a County, with the double bottom. It sprung a leak due to rusting between the two sheets.

If that's the case you may find your's was on the way out in any event.

That aside I collapsed the tank on an MQ Patrooool many moons ago when the vent pipe become blocked and the engine just kept sucking diesel. Wasn't worth the cost of fixing, if I recall.

Originally posted by Rosco+--><div class='quotetop'>QUOTE(Rosco)</div><div class='quotemain'><!--QuoteBegin-HSVRangie
water does not compress so when added presure is applied it wil not explode.

Air compreses and the amount of air under compresion wil be far more than the tanks volume so could expode if there is a fracture in it.

fill with water then use air
]]
Michael.

I beg to differ. True water is virtually incompressible, however, whether you leave the tank empty, put in a teaspoon of water or half fill it then apply compressed air, the pressure in the tank will be the same for the same applied air pressure ... pump it up to say 10psi, it will be at 10psi, regardless of the contents. The surface of the water will be under 10psi pressure, which gives the same pressure everywhere throughout the tank. You cannot achieve a pressure gradient within a confined space, such as this.

Cheers[/b][/quote]

volume of air wil be less, air is last resort.

using water and pumping in extra water to increase pressure wil work well household my be enough and it wil not explode with water.

water pressre is used for testing pressure vesles for this reason.

Yes have infalted slightly damaged tanks,.

Michael.

Originally posted by HSVRangie+--><div class='quotetop'>QUOTE(HSVRangie)</div><div class='quotemain'>

Originally posted by Rosco@
<!--QuoteBegin-HSVRangie

water does not compress so when added presure is applied it wil not explode.

Air compreses and the amount of air under compresion wil be far more than the tanks volume so could expode if there is a fracture in it.

fill with water then use air
]]
Michael.

I beg to differ. True water is virtually incompressible, however, whether you leave the tank empty, put in a teaspoon of water or half fill it then apply compressed air, the pressure in the tank will be the same for the same applied air pressure ... pump it up to say 10psi, it will be at 10psi, regardless of the contents. The surface of the water will be under 10psi pressure, which gives the same pressure everywhere throughout the tank. You cannot achieve a pressure gradient within a confined space, such as this.

Cheers

volume of air wil be less, air is last resort.

using water and pumping in extra water to increase pressure wil work well household my be enough and it wil not explode with water.

water pressre is used for testing pressure vesles for this reason.

Yes have infalted slightly damaged tanks,.

Michael.[/b][/quote]

If it will explode at 'X'psi with air it will explode at 'X'psi with water. I think you'll find they pressure test with water as it's much faster than using air.

decent town/home water pressure will pop most tanks as long as the tank isnt creased.

filled with water to brim then pressurised with air is way safer than air alone....

air explodes as such because of the volume of air. (it compresses)

water does not compress takes very little extra water to increase pressure.

tanks may crack but pressure reduces instanatly as the volume is no large.

where as air is huge in volume under preesure so i t explodes upon rupture and escaping air tears the tank aprt.

Michael.