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Thread: SAB 8-180 and VMY 432
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25-12-2011, 10:32 PM #1
SAB 8-180 and VMY 432
Hello coleagues
I am preparing reconstruction of old industrial plant and I am planning to use three existing compressors:
SABROE SCREW PACKAGE VMY 432 MK2, for low stage, 250 kW EM
SABROE PISTON PACKAGE SMC 8-180, for high stage, 200 kW motor, 750 rpm
SABROE PISTON PACKAGE SMC 8-180, for low stage, 90 kW motor
Does anyone know capacities for these compressors?
Low stage means -40/-10C. High stage means -10/+35C
Regards
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27-12-2011, 05:02 PM #2
Re: SAB 8-180 and VMY 432
hi Bezar,
I could send you something next week but you must give some more informations:
- refrigerant? NH3!
- I know VMY 425, 436 Mk2, 437 but not 432. are you sure of these digits. if it is 436 there is a letter behind H, L,M...
regards
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27-12-2011, 07:45 PM #3
Re: SAB 8-180 and VMY 432
Hi Cricri
Thanks for your reply.
Yes it is NH3, I thought it is obvious but it was my mistake not to mention.
Regarding screw compressor, yes it is 436 MK2, again my mistake.
Thanks in advance
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27-12-2011, 07:50 PM #4
Re: SAB 8-180 and VMY 432
OK, we'll see that next week
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28-12-2011, 09:54 AM #5
Re: SAB 8-180 and VMY 432
Bezar,
Regarding the piston compressors I can help you immediately. Concerning the VMY since it's a even more old out-phased compressor I would have to check the old libraries (and I'm on vacations)...if cricri can't help you I help you later.
About the SMC 8-180, it is a MK1 if it was a MK2 it would be a SMC188...please check. The head covers are rounded on the MK1.
The MK1 gives about 90% of the MK2 capacity. The swept volume of the MK1 is lower.
Right now I just have information about the MK2 » SMC188:
-10șC/+35șC (with non pressure losses and non superheated) » cooling capacity 763 kW, shaft power required 197 kW.
If it is SMC188 MK2 the 200 kW motor will be short. If it is SMC8-180 so it looks okay...even so if the suction and discharge pressure increase enough the motor could the overloaded.
-40șC/-10șC (with non pressure losses and non superheated) » cooling capacity 216 kW, shaft power required 57 kW.To make progress is never good enough, I want to do better and better and better
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28-12-2011, 11:55 AM #6
Re: SAB 8-180 and VMY 432
Hello Bezar.
Hopefully some of the attached will be of use to you?
Grizzly
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29-12-2011, 08:09 AM #7
Re: SAB 8-180 and VMY 432
Thnks for info on pistons. I appriciate it. Do you have any ide why would they mount 90 kW motor on low stage SMC8-180 if the shaft power is so low?
Regarding HS SMC, it is 8-180
Please send VMY information when you get back from vacation, and have a some good time, wherever you are.
Cheers
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29-12-2011, 08:11 AM #8
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30-12-2011, 02:37 PM #9
Re: SAB 8-180 and VMY 432
Still not containing the refrigeration capacity you can have some good idea of the capacity based on the swept volume compared with the capacity of a compressor which you know its own capacity.
To make progress is never good enough, I want to do better and better and better
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30-12-2011, 02:46 PM #10
Re: SAB 8-180 and VMY 432
It Could be a case of a blast freezing tunnel (on its star up the suction pressure can well stay a while on -25șC) or just cold stores (evaporating temperatures about -30șC...and on some moments can rise a little the suction pressure). Also the LP discharge pressure can be somewhat about -5șC in some peaks.
In any these common cases the electric motor shall be 90 kW to run nice without thermal overload danger.
To make progress is never good enough, I want to do better and better and better
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30-12-2011, 03:10 PM #11
Re: SAB 8-180 and VMY 432
I'm still in vacations but I did a search to AERZEN who is the manufacturer of the VMY (at many years ago the firsts screw weren't SABROE).
In the file I sent you I think you will find the info you want.To make progress is never good enough, I want to do better and better and better
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02-01-2012, 02:59 PM #12
Re: SAB 8-180 and VMY 432
Hi Bezar, you can check your mail box
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08-01-2012, 01:47 PM #13
Re: SAB 8-180 and VMY 432
Hey guys thank a lot for your help. Especially to cricri and Sandro Baptista.
Regards
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09-01-2012, 09:34 AM #14