Need Info on Compressors

[Dan Gibson]

Assuming fill tanks start from 0 psi.

Supply Tank(s)
Tank Size: 444 cu ft [767232.00 cu in]
Tank Pressure: 4500 PSI
Tank Mol: 159929.15 mols
Cascade System
01 Tanks

Fill Tank
Tank Size: 80 cu ft [138240.00 cu in]
Tank Pressure Max: 3000 PSI
Tank Pressure Start: 0 PSI
Tank Filled Mol: 19210.71 mols

Fill PFill MFill P Tnk1 M Tnk1 M Usd1
1 3000 19211 3959 140718 19211
2 3000 19211 3419 121507 19211
3 2897 18551 2897 102956 18551
4 2455 15719 2455 87237 15719
5 2080 13319 2080 73918 13319

I can add as many tanks to the bank as I want.

(3) 444 cft/4500 psi cascade
Supply Tank(s)
Tank Size: 444 cu ft [767232.00 cu in]
Tank Pressure: 4500 PSI
Tank Mol: 159929.15 mols
Cascade System
03 Tanks

Fill Tank
Tank Size: 80 cu ft [138240.00 cu in]
Tank Pressure Max: 3000 PSI
Tank Pressure Start: 0 PSI
Tank Filled Mol: 19210.71 mols

Fill PFill MFill P Tnk1 M Tnk1 M Usd1 P Tnk2 M Tnk2 M Usd2 P Tnk3 M Tnk3 M Usd3
1 3000 19211 3959 140718 19211 4500 159929 0 4500 159929 0
2 3000 19211 3419 121507 19211 4500 159929 0 4500 159929 0
3 3000 19211 2897 102956 18551 4481 159269 660 4500 159929 0
4 3000 19211 2455 87237 15719 4383 155777 3492 4500 159929 0
5 3000 19211 2080 73918 13319 4217 149885 5892 4500 159929 0
6 3000 19211 1762 62632 11286 3994 141960 7925 4500 159929 0
7 3000 19211 1493 53069 9563 3723 132312 9648 4500 159929 0
8 3000 19211 1265 44966 8103 3410 121204 11108 4500 159929 0
9 3000 19211 1072 38100 6866 3063 108859 12345 4500 159929 0
10 3000 19211 908 32283 5817 2734 97168 11691 4452 158226 1703
11 3000 19211 770 27354 4929 2434 86509 10659 4350 154603 3623
12 3000 19211 652 23177 4177 2162 76840 9669 4199 149238 5365
13 3000 19211 553 19638 3539 1916 68107 8733 4004 142299 6939
14 3000 19211 468 16639 2999 1695 60250 7857 3769 133944 8355
15 3000 19211 397 14098 2541 1497 53204 7046 3498 124320 9624
16 3000 19211 336 11945 2153 1320 46905 6299 3195 113561 10759
17 2885 18474 285 10121 1824 1162 41289 5616 2885 102527 11034
18 2600 16652 241 8575 1546 1021 36295 4994 2600 92415

Bruce, If you are interested, I may be able to get you a copy of the program. I would have to check with the guy that wrote it. He wrote it for fun and not money. He's quite the nerd.

 

[iain/hsm]

Assuming fill tanks start from 0 psi.

Bruce, If you are interested, I may be able to get you a copy of the program. I would have to check with the guy that wrote it. He wrote it for fun and not money. He's quite the nerd.

Dan.

That program sound very useful any chance considered for a copy too.

 

[Dan Gibson]

If you send me your private email and I can send it to you. It is about a 3.6 MB file zipped up and needs to be installed. If your email will take it, I can do it. Then you should test it and let me know how it works and if you see any bugs. It's all based on transfer of moles, so it should be pretty accurate. It will not take into account any losses.

Dan.

That program sound very useful any chance considered for a copy too.

 

[pescador775]

Beth,
I have a new compressor for sale. It is rated 4 cfm @3800 and will fill an S80 from zero to 3000 in 19 minutes (timed). It uses a 5.5 hp Honda gas, has extensive filtration and a carry case. It weighs 80 pounds. Price $2600.

 

[milkathecow]

Another idea ... don't know if you feel like doing it and if it's worth it, but still never know.

how about getting a fast, compressor or blender (NRC also have membrane nitrox air fill which are good), and before getting it, have a look around the camping site or places where you go to see if people dive and also want a tank fill.

Filling a few tanks here and there for other people might get you a few bucks here and there to pay for a larger/more powerful compressor no ?

 

[got4boyz]

Filling a few tanks here and there for other people might get you a few bucks here and there to pay for a larger/more powerful compressor no ?

Thanks. Actually it is a pretty good idea. Many places I dive are quite remote and don't often see many divers there. Other places I think would work, but I don't dive there often. My other concern is liability. What if they claim I gave them bad air. Don't know if I'd need a license or something to sell air here and there to somebody.

 

[VaPadiDiver]

For those looking at buying a Portable, yet dependable compressor here is my story.

I bought an Alkin w31 about 2 months ago (June 2005). www.chesterdiveclub.com/compressor.htm I searched high and low. I looked at all the models out there. I looked at new ones, used one, military surplus... you name it. I bought an Alkin and I cannot be happier. It is a 3.5 cfm compressor that cost about $3000.00 +/-. As for portability, it weights about 119lbs. (electric) but it has wheels. I also have rigged up a 25' extention cord (220v single phase, not a regular cord - had an electrician make it ($30.00) which I attach to a gas generator. Generator is about 5000 watts, one I got at Home Depot for about $600.00 before hurricane Gaston a year ago. It works great. The compressor draws about 13 amps at startup and my generator barely feels it. 25' cord keeps the generator fumes away. 50' may be fine too. the longer the cord the harder the startup may be due to drop of electricity over distance.

I bought the compressor from Airetex. I also found that the staff at AireTex (Kay and Deigo.. hope I spelled that right) are Very nice and helpful. Great people to call and ask questions to. I did not feel like an idiot for asking questions most people buying a compresor should know. Also, this is the best part, I ordered it on a Friday from Texas, it arrived in Virginia Monday morning

I do have to recommend to anyone though, buy a storage bottle (444cf 4500 psi tank) or 2 or 3 of them. You will run your compressor a while to get them full but you will run it alot less to fill or top off tanks. This saves the internal parts of the compressor that bang around at the inital start-up (This happens on ALL HP compressors not just Alkin).

If anyone wants to see my setup via pictures or in person, please email me directly at contact@chesterdiveclub.com. I am 1/4 mile off of exit 54 on I-95 in Virginia (Lake Rawlings Area) Again, my opinion is non bias and this is not a publicity post for Alkin, just another diver giving his two cents.