Determine remaining welding gas in cylinder

[CincyFlyer]

So when water freezes it doesn't expand? Care to explain that?

First, one must understand "weight" and "mass". Mass is not volume.

 

[rustyshakelford]

All that useless math that people say they are never going to use again.... SMH

I’m not using it. When it stops flowing and my weld suffers I change the bottle. No need for stinking math

Brett

 

[Rock knocker]

First, one must understand "weight" and "mass". Mass is not volume.

We'll have to start a remedial physics class for a few here

 

[4570Man]

Physics lesson number one. This is the only way to curl a bucket up while extending the cylinder, without moving the cylinder under the bucket.

 

[yomax4]

Sorry, I just saw this old thread. I just have a lot of friends in the business from being a rep for 25 yrs after working at a distributor for 12. They give me a free tank of 92/8 and their cost is about $2.00. Sad what you honest folks have to pay for gas.

 

[Arc weld]

YES, welding and industrial gases have about the highest markup of any product sold in the entire world! They say diamonds have a huge markup(300%?) but it's not even close. I've heard numbers such as 600-800% markup on industrial gases. I toured an Air Liquide air separation plant. They said they made enough money to break even just on the Argon they sold which is approx. 1% of the earths atmosphere. Everything else was just gravy (pure profit). There's a reason Air Liquide, Praxair and Linde are all multi-billion dollar companies and also why welding supplies are more worried about selling gases than welding supplies.

As far as weighing cylinders, it won't work unless it's CO2 which is liquid like propane. A common question is why a full helium cylinder is so heavy.

 

[flingwing1969]

We'll have to start a remedial physics class for a few here

Sometimes physics does not seem to be what we see. I think we need to say that a gallon of liquid water, converted to one of its two other usual states - ice or water vapor - will still be a gallon of water and will still weigh (at 4C) 8.34 pounds. That same gallon of water in frozen state will weigh within a bit of 8.34 pounds, unless it picked up a few molecules of gasses due to mixing during the freezing process. That same gallon of water trapped in a previously evacuated container will weigh, 8.34 pounds. In its non-liquid state, a gallon of water will have a greater volume but its in its liquid state - but its weight/mass will remain the same. On earth we commonly refer to weight instead of mass and use them interchangeably since this is the gravitational standard for humans. That gallon of water/ice/water vapor on the Moon will have the same mass as on Earth, but its "weight" will be less.

 

[flingwing1969]

Physics lesson number one. This is the only way to curl a bucket up while extending the cylinder, without moving the cylinder under the bucket.

Like it.

 

[tkevan]

Every tank has a tank factor. I.e. an H cylinder has a tank factor of 3.14. You take the tank factor and multiply be psi. That gives you liters remaining. Decide by flow rate and you have remaining time.

BTW, that tank factor is for O2, CO2 or another gas has a different factor.

 

[flingwing1969]

Every tank has a tank factor. I.e. an H cylinder has a tank factor of 3.14. You take the tank factor and multiply be psi. That gives you liters remaining. Decide by flow rate and you have remaining time.

BTW, that tank factor is for O2, CO2 or another gas has a different factor.

Thank you. Isn't that just for medical O2 cylinders?