Haskel v baby booster

Beanie

bloody hell

I think I'll stick with somewhat smaller models

__________________
Beanie
Gallery Admin & Library Assistant.
www.outlawdivers.org.uk
www.beandiving.co.uk
www.beanengineering.co.uk
www.divelife.co.uk

mdsourou

Hello Z
That one doesnt travel. Not easy. Is a beast! I can make it empty the cylinder down to 3bars and pump up to close to 500 but it will be a bit slower and i dont really need this 500. I have a smaller one to travell. I ll upload another picture of my other one tomorrow or Monday. I have another one now in progressthat will pump only up to 165 but pump a hell more oxygen at a single pump, be a bit slower and empty the cylinder down to 3. It's all about Maths

iain-hsm

Nigel.
I guess now you know thats why when you buy a booster pump in the UK they are always supplied with relief valves fitted.........aren't they?

iain-hsm

I guess before you get any comment (from me) we need more information

1. What are the piston diameters?
2. What is the piston stroke (travel length)?
3. What is the piston cycle time?
4. What is the minimum pressure and maximum pressure you compress to in any one filling cycle?
5. What is the maximum size of cylinder you have filled?
6. What is the longest running cycle you have ran so far?
7. What is the maximum temperature (in Cyprus) you have operated?
8. What is the maximum gas temperature you have recorded?
9. How long to fill a cylinder (size) from full to empty and to and from what pressure. Also what was the start and finish pressures in your storage (donor) cylinder? Also do not include in this time (if any) the decanting period.

You see this way we can first evaluate the compression ratio, the gas velocity, and adiabatic compression considerations, also adiabatic heat loadings and stress. Regards Iain

PeteS

Err, No. My Haskel didn't even have pipes!

__________________
Pete S.

http://www.steggle.co.nz

Every silver lining has a cloud

mdsourou

Hello Iain
An answer for the questions number 1,2,3 I cant give it to you for understandable reasons and i hope you misunderstand that.

Question No4: if i really understand what you mean is from 1-280bars

Question No5 Maximum one was a 50ltr fill He to 240bars. I fill many 15, 20ltrs twins,singles 18 etc.

Question No6: No more than an hour as i dont need to. Its working so fast and pump so much gas every stroke that it the time that takes me to fill a cylinder is so short (I never follow the rule 4-7bars per min. I cant make it work that slow anyway. Especially when my 50ltr o2 cylinder is full up to 150 bars. I have to keep stop it from pumping)

Question No7 Maximum temperature 45degrees Celsius or 113 Fahrenheit

Question No 8 I dont have something to count the temperature. The only thing i can tell you is that you could hardly touch the pistons from the heat

Question No9 About question No9 i cant answer it right now as i never count it but i can do it some other time, record it and upload it on the Rebreather World

Sorry about the first 3questions. I hope you understand. I will attach tonight a photo of my smallest booster pump that i travel it around. Its exactly the half size of it.

Cheers

kiwidiver

when you answered qustion no8 and stated you could hardly touch them from the heat this would be of a concern to most people that boost gas.

mdsourou

Hi KiwiDiver
To be fair it doesnt really concern me as the most things they say about boosters pumps they different a hell lot from Russians. About boosting, materials they use, liquids etc etc Make a research and find out. And by the way i have an air condition in the room now working at 22degrees so it never get any hot
I also attached my smaller booster that i use when i travel around
One of the pictures i put it next to my big one for comparison on the size


Cheers

Attached Images

20012008276.jpg (672.8 KB, 4 views)

mdsourou

Another Photo for the compsarison

Attached Images

20012008277.jpg (623.2 KB, 3 views)

iain-hsm

Now I see it against that scuba cylinder it’s much smaller than I had first thought, at first I thought the dam thing was over two meters tall!!

I’m Ok you can’t answer the questions, but someone should have worked from the compression ratio first, and also have tested the outlet gas temperature at the very least in order for it not to exceed the ring and seal melting temperatures.

I cannot answer for the Russian designs unless you are again more specific, however the military do allow greater stress in there designs that is why they protect themselves from failure by having a designed operational life expectancy, after which the products are scrapped. Using old military pumps in our industry is just picking up a great risk.

To the original question on the Haskel AGT 30-75 is as the 30-75 is a two stage, booster and it is much better suited to safety by reducing the compression loading on each of the individual stages of compression. The small Jetsam pump has but one advantage in so far that it is so small and the compression stroke low enough that the heat generated etc. etc, so tiny as not to cause much concern, further when these small pumps fail the “teaspoon” of gas in then is little more than a “pop” leaving a black soot. The Haskel 30-75 by comparison uses the huge drive air volume after each compression stroke to cool the piston barrel, a very cleaver idea as they have masses of cooling air to safely bring the gas temperature down thus allowing a greater flow or a greater pressure, or a lower inlet pressure to a higher outlet pressure or all of the above.

This big Cyprus booster is just a single stage, but twin piston unit and by compression from <3 bar to >250 barg and is effectively working on a huge 80:1 plus ratio. As most manufactures would, given the same set of inlet pressure and outlet pressures work on a more conservative 4 stages of compression for oxygen, its by the “maths” 4 times riskier than anything else.

Incidentally this Cyprus pump with oxygen compressing the gas temperature should not get IMHO much above the temperature of hot coffee, and gas temp calc is not the same as the pipe temperature. The gas velocity flow in what I guess 3/8” stainless tubing at high pressure should not IMHO go over 1000 l/min. It IMHO should have never used steel plated fittings in the branch of these pipe tee’s with hot, high pressure oxygen, It’s just asking for trouble.

With oxygen I have a saying to add to these mathematical formula.
“Learn or Burn”. Iain Middlebrook