The 'official' answer to this is daily. If you're being asked this for test purposes, that's what you respond with. In practice, nobody actually does it daily.
Yes Where I work if the tanks aren't drained before you go home you will be punished. Water can build up in the tanks, especially in cold weather and valves will freeze and everything grinds to a halt.
Because the water can freeze in cold weather And cause brake failure.
You are supposed to drain your tanks daily, especially if your truck has only two tanks, and doesn't have a wet tank.
Air tanks were invented to hold compressed air.
No, many 'galvanised' tanks do not have an air volume control. As long as the tank is not drained while the pump is 'off' (ie in an electric cut-off) the tank is safe.
Air tanks come from russian bollets made from solfer umonier
This should be done daily, as condensation and contaminated matter could be present.
It's pumped in with an Air Compressor
The pressure in your tank should be checked with water drained from the tank, with the water drained the air pressure in the tank should be set 2psi lower than your kick in pressure. So for a kick in pressure of 25psi the tank air pressure should be set at 23psi.Ans 2 - Water should NOT be totally drained from the tank or you may get a false reading ! - Leave 2-3 gallons in the tank. Most systems have the pressure switch set at 30 Psi, so tank residual pressure should be 28psi. - Lower than this gives really dismal pressure in the shower, especially if it's on second floor.
Nitrogen.
Firefighters typically get oxygen tanks from their fire department or fire station. These tanks are filled with compressed oxygen and are essential for providing breathable air to firefighters in hazardous or smoke-filled environments.
When it is dirty.