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The air bottle is 8" in diameter and 4 ft high. The plan is to contract a company (I believe it will be Praxair) to bring in air bottles ever time it runs out. There are a number of other applications, but this one will draw the most from the bottle. I agree the best way to approach the...

This calculator worked well for me. http://www.engineersedge.com/spring_menu.shtml

I think I owe it to you all to give you a little more specific information on the application. I really appreciate all the thought and help that went into this, but is just how engineers are eh? I have an high pressure air tank (like a scuba tank, only 400 cu ft) that is being used as a...

zeusfaber, Is there anyway that you can explain what you did a little more? Because it would seem as though this bottle would last for 60 8-hour shifts. But where did the magic 73 come from? 37.5/0.5 would be 75 so i am thus confused. Thank you very much, Ras

It is variable. I have some freedom to play with time and volume, but we can say 400 cubic feet for the large air bottle.

Hello, I am looking to do a simple calculation. I have an air bottle, pressurized to 3000psi, and am going to draw 80psi @ 0.5 cfm from it. I need to know how long this bottle is going to last. Its been a while, so I am drawing a blank. Any help would be appreciated. Thank you

Hey Jon, I read that site before I actually posted this topic, and the problem for me was that I already understood what a Go No Go gage(s) is, I just wasn't sure about the different tolerances, which wasn't there in a way I could understand anyways.. if you have a generic tolerance chart that...

Jclough, I am trying to determine the correct tolerances to machine Go/No Go gages made out of stainless steel to use on machined plastic and steel couplings for pipe. For example, one gage will either go or not go over the OD of the machined pipe, and another gage will be machined to line up...

Hello, As of this point, I found literature stating that the tolerance of a Go or No-Go gage must be no more than 1/10th of the total tolerance for that dimension. Is this a standard? Or should I also be accounting for the material used for the part, the gage, etc. Also, Class XX, X, Y and Z...

PUMPDESIGNER, I would like to have a look at some literature on theses thermal dispersion flow switches. I am working within a budget, as well as space restrictions(as I am sure we all are at most times), and this will play a big part in determining the feasability of these switches. Thank...

Patricia, This is for a groundwater monitoring application. It will not suffice to know whether the pump is working. The chamber will be filled with fluid and not always pumping. For controls sake, it is necessary to have a sensor to determine whether the fluid is being pumped, regardless of...

Hello all, I am looking for a method to determine whether fluid (most probably water) is flowing/being pumped from a remote location. Perhaps a switch or sensor that activates a current once flow is detected. It needs to be -small -inexpensive -withstand about 2000psi Perhaps someone can point...

David, That sounds like a really good idea. However, I dont' quite know what you mean by "put in a spec-break." Also, if you have any vendors you would recommend, I would much appreciate that. Thank you for your advice. Ras

I just posted this to get some feedback on the quality of Rupture Discs for such a close tolerance of pressure.... The system I am dealing with is a calibration system with MAWP way above what is being dealt with. The Quartz pressure transducers are most accurate at their maximum range and that...

saxon, A very valid observation, and one that I had myself once they started me on this mini-project. However, this process has been running long before I got here and the people here are very qualified. I will ask this question to them, as it puzzles me too, but I think it's already been dealt...

Thanks TD2K! Thats what I thought in terms of the fatigue life of the disc. I will be in contact with a vendor later today and see what they have to say as well. The second part comes out of nowhere, I apologize. I need to size several rupture discs for several different transducers. Each...

I am looking into using a rupture disc in a simple system (1/8" Stainless Steel tubing) to protect a very expensive pressure transducer. For expample, the guage is used upto 300psi, but it will break at 330, and so i need the rupture disc to go off if the pressure gets to about 320psi but...