3 ms·

It's not really under much pressure, about 8-10 bar. It's in the same ballpark as a light truck tyre pressure.

by Gordonjcp 4y ago

mulmen 4y ago
Have you seen the payload numbers for light aircraft? Payload with full fuel on a Cessna 172 is only 369lb. How much does a vessel that can withstand 10 bar weigh? A light truck tire weighs about 50lb. Recall that this vessel must withstand the temperature, pressure, and vibration extremes of aircraft application. Light truck tires aren't typically filled with flammable gasses. 10bar is a terrifying amount of pressure when it comes in your direction.
- Gordonjcp 4y ago
  Not sure, to be honest. I can lift the 95 litre tank in my Range Rover with one hand, so probably about 20-30kg? When it's full there's about 40kg of gas in, so that's very much a two-man lift. But bear in mind that's something like 6mm steel and intended to be literally indestructible. The dinky fibreglass gas bottles you get for patio heaters and forklifts are about 5kg and take an 11kg fill, which isn't a lot. 10 bar is not much more than the pressure in your car tyre, and roughly same as the average road bike tyre (currently running about 12 in my road bike). If you disconnect a 10 bar compressed air line, it hisses a bit. If you disconnect a 10 bar LPG line you get a lot of very cold gas on your hand, and it'll take ages to get the mercaptan-y smell off you.
  - mulmen 4y ago
    1bar is 14.5psi. Are we doing the same conversion? 10 bar is literally 4x the pressure in my car tire and 50% over that of my road bicycle. My air compressor operates at around 10 bar but the hose is regulated down to 2.5 bar and blasts debris all over the driveway when I disconnect it. If I don't firmly hold the air tool it shoots out like a missile. 30 extra kg is a loss of about 20% of effective payload. And this says nothing of the loss in power density.

3 ms·

It's not really under much pressure, about 8-10 bar. It's in the same ballpark as a light truck tyre pressure.

by Gordonjcp 4y ago

It's not really under much pressure, about 8-10 bar. It's in the same ballpark as a light truck tyre pressure.

mulmen 4y ago
Have you seen the payload numbers for light aircraft? Payload with full fuel on a Cessna 172 is only 369lb. How much does a vessel that can withstand 10 bar weigh? A light truck tire weighs about 50lb. Recall that this vessel must withstand the temperature, pressure, and vibration extremes of aircraft application. Light truck tires aren't typically filled with flammable gasses. 10bar is a terrifying amount of pressure when it comes in your direction.
- Gordonjcp 4y ago
  Not sure, to be honest. I can lift the 95 litre tank in my Range Rover with one hand, so probably about 20-30kg? When it's full there's about 40kg of gas in, so that's very much a two-man lift. But bear in mind that's something like 6mm steel and intended to be literally indestructible. The dinky fibreglass gas bottles you get for patio heaters and forklifts are about 5kg and take an 11kg fill, which isn't a lot. 10 bar is not much more than the pressure in your car tyre, and roughly same as the average road bike tyre (currently running about 12 in my road bike). If you disconnect a 10 bar compressed air line, it hisses a bit. If you disconnect a 10 bar LPG line you get a lot of very cold gas on your hand, and it'll take ages to get the mercaptan-y smell off you.
  - mulmen 4y ago
    1bar is 14.5psi. Are we doing the same conversion? 10 bar is literally 4x the pressure in my car tire and 50% over that of my road bicycle. My air compressor operates at around 10 bar but the hose is regulated down to 2.5 bar and blasts debris all over the driveway when I disconnect it. If I don't firmly hold the air tool it shoots out like a missile. 30 extra kg is a loss of about 20% of effective payload. And this says nothing of the loss in power density.