View Full Version : Grasso SP2 two-stage ammonia screw compressor package.
Jacek
24-01-2009, 11:34 PM
Hello guys!
I have a question regarding Grasso SP2 two-stage ammonia screw compressor package - could someone tell me about advantages and disadvantages of it in comparison with systems with booster compressors?
For these guys who do not know what Grasso SP2 package is - this machine consists of two independent screw compressors (one for first stage and one for the second stage) with two electric motors mounted on a common frame with a common oil system (a common oil separator).
Thanks for any ideas.
Regards.
Jacek
RANGER1
25-01-2009, 03:37 AM
Jacek ,
System you have or refer to has a booster compressor ie first stage .
What i think you are refering to is seperate 2 stage system with intercooler .
Cant see much benefit for Grasso SP2 unless you are wanting very low tempreture system of say below -45 deg C .
Mycom programe shows same performance for single stage economized 200L as 2016LSC compound screw ( Which is basically same as grasso screw but bolted together using 1 elec motor ) .
Conditions of -33 deg C SST / + 35 deg C SCT .
Grasso advantage
No intercooler required
Less components in system ( cheaper installation ) .
Side load into interstage as well as economizer for subcooling
Disadvantage ( compared to single stage economized ) .
2 elec motors to maintain as well as electricals
2 shaft seals to leak
2 compressors to overhaul
Harder to incorporate redundancy in case of breakdown .
Probably only suited to very low temp application , otherwise why not single stage / economize plant ?
If first stage comp is damaged any debris will go into second stage compressor
Maybe you could give a bit more info as to conditions and application
Jacek
25-01-2009, 12:17 PM
Jacek ,
System you have or refer to has a booster compressor ie first stage .
What i think you are refering to is seperate 2 stage system with intercooler .
Cant see much benefit for Grasso SP2 unless you are wanting very low tempreture system of say below -45 deg C .
Mycom programe shows same performance for single stage economized 200L as 2016LSC compound screw ( Which is basically same as grasso screw but bolted together using 1 elec motor ) .
Conditions of -33 deg C SST / + 35 deg C SCT .
Grasso advantage
No intercooler required
Less components in system ( cheaper installation ) .
Side load into interstage as well as economizer for subcooling
Disadvantage ( compared to single stage economized ) .
2 elec motors to maintain as well as electricals
2 shaft seals to leak
2 compressors to overhaul
Harder to incorporate redundancy in case of breakdown .
Probably only suited to very low temp application , otherwise why not single stage / economize plant ?
If first stage comp is damaged any debris will go into second stage compressor
Maybe you could give a bit more info as to conditions and application
Hello Ranger1.
Many thanks for your reply.
Telling about comparison, I had the difference between Grasso SP2 machine (or Mycom) and the plant with, let's say, two compressors (one high-stage and one low-stage - a booster compressor) in mind... I'm not talking about the one-stage compressor with the economizer port.
Could you possibly provide me with the brief comparison?
I hope I express my thoughts in a clear way.
Thanks one more time.
Jacek
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