Ronny

iTrader: (1)

I am adding a pressure gauge to my existing bottle that is maybe 50-70% full.

What pressure should I see on a newly filled bottle and when does one refill. Maybe 150 psi?

Cosmik Debris

It depends on the temperature but somewhere around 900 psi. The pressure actually stays fairly constant as the bottle empties. The best way to see how full it is is to weight it.

Ronny

iTrader: (1)

Would full bottle read 1500 psi?

Cosmik Debris

not unless it was very hot.

Drac0nic

The actual pressure is dependent on the liquid temperature rather than the volume. The link below has an awesome table that shows the relationship between nitrous pressure and temperature of the liquid in the bottle.

http://nitroussupply.com/bottletemp.php

Boiling is actually a cooling action, and because of this as you vent more liquid from the tank the cooler it gets ultimately. This is why people have blankets and heaters, to help maintain a constant temperature and in turn a constant nitrous pressure with multiple passes.

Your best bet is a scale of some kind. If you look at the tank it should have a "TW" reading on it. This means Tare Weight, or the weight of the bottle empty. If you throw it on a scale (If you can find the right kind I've seen fish scales used this way) you should be able to figure out the weight of nitrous left in the bottle. Here's a link to a scale that would probably work pretty good when you figured out a way to hold the bottle. Maybe a large cloth grocery bag you could put it in, or some other sling? This is about $25, you would throw your bag on there, hit the tare button to zero it out, then throw the nitrous bottle in it, subract the "TW" number from your reading and that's the nitrous you have left. Unless they have some kind of meter system that I'm unaware of this should be how you buy nitrous too, the guy sticks it on a scale of some kind, fills the bottle until it hits the desired weight.

http://www.oldwillknottscales.com/je...FUWd4Aod6R8AIQ