Compressor selection 2

[RMSINT]

Hi all, We have an application to boost/compress commercial nitrogen from ~580 psi inlet pressure to ~590 psi(10psi boost)in a closed circuit for heat transfer application. Operating Temp is ~150-210 deg F. The inlet volume is 800 ICFM at 580psi Can any one suggest what are the options and who makes and which will be most durable and maintenance free units?

Also can I have an approx idea of theoretical BHP need in this application? (I had way off conflicting figures given by some vendors) Thanks in advance ....Raj

 

[wimple]

Of course 50 HP we are talking about "Gas power".
No Mechanical losses included.

Rgds
Wimple

 

[dcasto]

If you run the ariel program with VMG thermo gata, it calculates 229 HP on a JGR 4 frame. Using a JGE2 with pipeline cylinders you get 116 HP.

I ran a 70% polytropic eff and got 50HP. I assume a custom unit could get that efficency. Sundyne would be another good choice

http://www.sundyne.com/cda/ind/pr/spec/0,10516,CLI1_DIV92_ETI7223_IMD2_MDI41,00.html

Sundynes typically run in the 50% range of eff, so it could be a 70 HP unit.

 

[zdas04]

I put the data into Ariel and on the Service/Stage screen (where it does a hp calc without knowing the compressor) it calls it a 477 hp application. This was with 100% nitrogen, dehydrated.

I went ahead an put in the JGR/4 (the program picked 7-3/8R cylinders with a 7-inch bore) and got 286 hp. I'm not sure that Ariel can really handle sub 1.1 ratios.

I tried it in Coolware and Rotosize, but no screw is going to work with that suction pressure.

The Sundyne looks like a good machine, too bad they don't have a calculator but I don't know of any centrifugal machines that do. My experience says that if a PD machine is between 200 and 500 hp then a dynamic machine will be a lot higher hp than 70 hp. I'd love to see RMSINT submit this application to a centrifugal compressor vendor and see what driver they recommend.

David

 

[dcasto]

We use sundynes all the time on regen gas flow where dried gas is compressed through a heater, sent through the mole sieve bed to remove water, cooled to condense water and sent back into the inlet gas. The largest system I've run with a Sundyne is a 500 psi in, 550 psi out on about 25 MMSCFD. It had a 300HP motor on one and a 300HP steam turbine on the spare.

Most typical systems run about 25 psi differential and 2 MMSCFD. They have a 25HP driver.

Sundyne will size them up.

The oldest system I used a Swearingen as in Swearingen of RotoFlow and Unranium Centrifuge (multi-stage compresssor).