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[APD] empty CO2 cylinder

I've never seen the so-called end of tank dump occur & I've gone through
several tanks in the past. Much more likely to occur is that when the CO2
flow rate stops, the CO2 in the lines is dissolved into water. The water
travels back up the lines into the needle valve & potentially into the
regulator & cylinder. Fortunately, I believe the needle valve prevents most
of the water from passing backward. Water & CO2 in the regulator or cylinder
would be highly corrosive. I disconnect the lines as soon as I see the
cylinder pressure drop or notice water going back up the lines. Then its
time to refill the cylinder. Keep track of the certification date on the
cylinder because you might get stuck with the cost of hydraulic testing for
recertification at about $60. Its more economical to bring the tank in
before it gets empty & exchange it with a full one.

Take what you read here on the APD with a large grain of salt. There is
considerable difference of opinion on certain subjects. It's better when
those differences are discussed. It seems as if many of the old "experts"
aren't posting very often any more.

Steve P

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