Horsepower Calculator

The following calculation method uses the Gas Processors Suppliers Association Engineering Data Book Eleventh Edition, FPS Version, 1998, eq 13-4 developed for large slow speed (300-450 RPM) compressors with SG = 0.65 and having CR > 2.50. Discharge temperature based on eq 13-18 assuming 130 Deg F inlet and k of 1.3
Brake Horsepower = 22 * (ratio/stage) * (Number of Stages) * ( MMSCFD) * (F) where F = 1.0 for a single stage, 1.08 for a two-stage and 1.1 for a three-stage.

Quick Horsepower & Pressure Chart

The following chart is an approximation tool used to estimate the horsepower requirement and configuration of a compressor (brake horsepower per million cu. ft.).

	Discharge Pressure (PSIG)
		25	50	75	100	150	200	250	300	400	500	600	700	800	900	1000
	0	65	99	128	144	168	187	203	218	233	248	260	272	282	291	299*
	10	35	63	85	104	131	149	163	175	196	214	231	235	242	250	257
	20		43	62	78	106	126	139	151	170	186	199	212	225	228	232
	30		29	47	62	85	107	123	133	152	167	179	191	201	211	221
	40			36	50	72	90	107	121	138	152	164	175	185	194	202
	50			26	41	61	78	93	106	127	141	153	163	173	181	189
	60				32	53	69	83	95	118	131	143	153	162	170	178
	70				25	46	61	74	86	109	123	135	145	153	161	169
	80					40	54	67	78	98	117	127	137	146	153	161
	90					34	49	61	72	91	109	121	131	139	147	154
	100					28	44	55	66	84	100	116	125	133	141	148
	150						22	35	45	60	74	86	98	110	118	124
	200								30	45	58	68	78	88	96	105
	250									33	46	56	65	73	81	88
	300									23	36	46	54	62	69	76
	350										27	38	46	53	60	67
	400											30	39	46	53	60
	500												26	34	41	46
	600													23	30	37

For example: it will require 299 horsepower of compression distributed among 3 stages to move from a suction pressure of “0” to a discharge pressure of “1000” for every 1000 MCFD.

For a flow of 500 MCFD, 50% (500 MCFD/ 1000 MCFD) of the horsepower is required.

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