compressor pump
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From: Pflugerville, tx
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From: Sapulpa OK
Torque is right! You also have to make sure when comparing CFM ratings that they are at the same pressure AND either "Delivered" or "Displacement. Compressors are not 100 % efficient. Delivered air is roughly 70% of displacement air. Good compressors are somewhat more than 70% and poor compressors are somewhat less than 70%. Good luck with it
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Joined: Sep 2001
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This is some info I have posted before in old archive threads:
=============================
The following values are taken from the catalog of a major manufacturer of high efficiency industrial motors for compressors. They will more closely resemble the values you should see on motors on high quality compressor units.
Single Phase Alternating Current Motors Full Load Current in Amperes:
---------------------------
HP - 115V - 230V
---------------------------
1 -- 16 - 8
1.5 - 20 - 10
2 -- 24 - 12
3 -- 32 - 16
5 -- 42 - 21
7.5 - n/a - 33
10 - n/a - 44
You can see that efficiencies increase as motor size/HP increases.
(Lower efficiency motors would have higher nameplate amperage ratings.)
To make things more confusing some retail manufacturers seem to "calculate" their SCFM ratings based on displacement and rpm. Commercial manufacturers actually test their units or use tables supplied by the pump manufacturer based on testing.
=============================
The following values are taken from the catalog of a major manufacturer of high efficiency industrial motors for compressors. They will more closely resemble the values you should see on motors on high quality compressor units.
Single Phase Alternating Current Motors Full Load Current in Amperes:
---------------------------
HP - 115V - 230V
---------------------------
1 -- 16 - 8
1.5 - 20 - 10
2 -- 24 - 12
3 -- 32 - 16
5 -- 42 - 21
7.5 - n/a - 33
10 - n/a - 44
You can see that efficiencies increase as motor size/HP increases.
(Lower efficiency motors would have higher nameplate amperage ratings.)
To make things more confusing some retail manufacturers seem to "calculate" their SCFM ratings based on displacement and rpm. Commercial manufacturers actually test their units or use tables supplied by the pump manufacturer based on testing.
Last edited by Torque1st; Aug 30, 2005 at 03:26 AM.
