The answers to the following questions will provide the parameters for the selection of any gas booster or ProPak booster system.
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1. What is the maximum pressure to be attained?
You need to know the pressure that the system will have to reach, either now or sometime in the future. This does not need to be the usual working pressure, but the maximum pressure ever needed.
2. What is the required flow rate?
You need to know the required flow rate at the required discharge pressure. This is not the flow rate at the maximum pressure, but the flow rate at the working pressure. Remember that every booster has a maximum pressure where it will stall and produce no flow, but at any pressure less than that it will produce flow. This flow reduces in quantity as the output pressure approaches the stall pressure.
3. Is the flow rate constant?
Do you have a process application where you need a constant flow at a constant pressure? If so, then this is expressed as “x” SCFM (NM3) @ “y” PSIG (Barg).
4. Is the flow rate decreasing?
Do you have an application where you are filling cylinders or some other vessel from a lower supply pressure to a higher storage pressure. To select the proper booster or booster system, you need to know the size of the vessel to be filled. This can be supplied in any form that can be converted to ACF.
5. What is the required fill time for the vessel?
It is very common to have an initial fill times that is unrealistic. Many people who are not
familiar with gases ask for fill times that will require uneconomic systems. Therefore it is important to think about the longest possible fill time the application can stand.
6. What is the gas supply pressure?
The performance of any gas booster is a function of the incoming gas pressure. Simply stated: “any gas booster will only discharge the amount of gas it takes in”. The higher the inlet gas pressure, the more SCF of gas are squeezed into the gas section and
therefore the more gas discharged. Gas supply can have more than one source. Therefore it can have many combinations of flow, pressure and temperature.
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7. What is the drive pressure?
This is not the initial pressure in the system first thing in the morning before all of the uses of air are operational, but rather should be the minimum that the plant experiences throughout the day. The booster may have to provide maximum performance when the drive conditions are at their worst.
8. What is the gas?
Some gases cannot be pumped with standard boosters. They may require special seals, materials of construction, venting and other considerations. This is also important when higher pressures are required in filling applications to determine the compressibility of the gas. Applications involving gas boosters will always fall into one of four categories. It is very important to clearly determine into which category a particular application fits.
a) The supply pressure is at a constant pressure (Ps) and the discharge gas is at a constant flow (Q) and pressure (Po).
b) The supply gas is from a decreasing pressure and the discharge gas is at a constant flow and pressure. It is safe to assume that the supply flow rate will decrease as the supply pressure decreases. To maintain the constant outlet flow the booster will have to increase its cycle rate.
c) The supply gas is at a constant flow and pressure and the discharge gas it at an increasing 8 pressure.. It is safe to assume that the discharge flow rate will decrease as the discharge
pressure Increases.
d) The supply gas is at a decreasing pressure and the discharge gas is at an increasing pressure. It is safe to assume that the flow rate will decrease significantly as the pressures get further apart.
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I need to make my gas blending more efficient. Currently I am PP blending nitrox & CF filling Trimix. I am not pleased with the CF method for various reasons.
A gas booster would solve some of the problems with the CF & PP blending. I know next to nothing about boosters other than the theory behind how they work.
There are practical questions I have regarding their use. One of the boosters I am looking at has a volume of 6.2 in3/cycle. Generally speaking what is the cycle rate of such a booster?? 1 cycle per second?? If it is 1 cycle/sec I come up with about 4.5 scfm for the booster, which is adequate for me, I think.
http://www.steammachines.com/ae2-Haskel.asp This one is $ new.
Does this booster seem adequate for filling say 3 or 4 sets of double 100 FT3 tanks a few days each month & maybe 15 80FT3 nitrox bottles per week?
Thanks in advance...
Does anyone have any better suggestion as to the type/model pump in this same price range? Any ideas where I can get one?
Its the method I set up about 9-10 months ago with pressure regs on the He & O2 bottles.
I have yet to be able to get the flow rates to be consistent. The percentages just fluctuate. When I make a change in the regulator pressure the resulting % takes several minutes to show up on the He & O2 meters.
You helped me a LOT with this when I set it up & your help got me as far as I did get...but the lag time between changing flow rate & the resultant indication on the meters causes me to run around like a ckicken with its head cut off.
The other thing is...last week I was filling 6 sets of double 120's and the compressor got hotter than I was comfortable with....If not for the compressor getting so hot I would consider trying to tweak my system.
Uncle Pug--thanks again for your help last year when Scott Klopin & you helped me set this up.
OK... now I remember... CF = CB
Jim, I know that Omar was toying around with analyzing pre-compression... and it is true that post compression analysis has a lag time of several minutes... but... once you get it set up it shouldn't fluctuate back and forth... it will change with the fill pressure but you can allow for this.
I have tape on my ball flow gauges marked with the starting points for the various blends I want. I might waste a little gas just to make sure that it is where I want it but once set I rarely adjust.
What I have found is that ambient temp seems to affect where I must set the ball on the tape to begin with. So I fudge one way during the winter and another during the summer. Where you live that shouldn't be a problem.
I try to make the dial-in setting by bleeding off enough gas to get xxxxpsi (whatever is the median pressure between start and end) on the manifold so that during the fill, mix variation from low to high pressure will offset itself.
Nitrox is a snap. Trimix takes a little fiddlin' since increasing the HE requires you to also increase the O2 and the same with decreasing either.
As for compressor heat... I can't remember what compressor you ended up with but I have a fan blowing on the front of my RIX. I am waaay past the projected run time for changing out my 3rd stage rings (all I pump is nitrox or mix) and I attribute that to the extra cooling fan.
Some days I am filling two sets of dbl 104s and the bank of three 250cf (psi) and the temp never goes up beyond what I can touch the first stage cylinder head with my finger... this is my scientific test for okey dokey status.
Questions???