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Wiki GC - Optimal Head Pressures and Flows for Capillary PLOT Columns

GC - Optimal Head Pressures and Flows for Capillary PLOT Columns

Created by Dr. Know 2 months ago | Last modified by Dr. Know 2 months ago

Head Pressures in [kPa]

Carrier Gas	ID [mm]	Flow [mL/min]	10 m	15 m	25 m	30 m	50 m	60 m	100 m
Nitrogen	0.25	≈ 0.4
	0.32	≈ 0.5	20 - 32	30 - 50	50 - 80	60 - 95	100 - 160	120 - 190	200 - 320
	0.53	≈ 1.0	4 - 12	6 - 20	10 - 30	12 - 35	20 - 60	25 - 70	40 - 120
Helium	0.25	≈ 0.7
	0.32	≈ 0.9	28 - 40	40 - 60	70 - 100	85 - 120	140 - 200	170 - 240	280 - 400
	0.53	≈ 2.0	12 - 20	20 - 30	30 - 50	35 - 60	60 - 100	70 - 120	120 - 200
Hydrogen	0.25	≈ 1.0
	0.32	≈ 1.4	16 - 20	25 - 30	40 - 50	50 - 60	80 - 100	100 - 120	160 - 200
	0.53	≈ 3.0	4 - 6	6 - 10	10 - 15	12 - 20	20 - 30	25 - 40	40 - 60

Head Pressures in [psi]

Carrier Gas	ID [mm]	Flow [mL/min]	10 m	15 m	25 m	30 m	50 m	60 m	100 m
Nitrogen	0.25	≈ 0.4
	0.32	≈ 0.5	2.9 - 4.6	4.4 - 7.3	7.3 - 11.6	8.7 - 13.8	14.5 - 23.2	17.4 - 27.6	29.0 - 46.4
	0.53	≈ 1.0	0.6 - 1.7	0.9 - 2.9	1.5 - 4.4	1.7 - 5.1	2.9 - 8.7	3.6 - 10.2	5.8 - 17.4
Helium	0.25	≈ 0.7
	0.32	≈ 0.9	4.1 - 5.8	5.8 - 8.7	10.2 - 14.5	12.3 - 17.4	20.3 - 29.0	24.7 - 34.8	40.6 - 58.0
	0.53	≈ 2.0	1.7 - 2.9	2.9 - 4.4	4.4 - 7.3	5.1 - 8.7	8.7 - 14.5	10.2 - 17.4	17.4 - 29.0
Hydrogen	0.25	≈ 1.0
	0.32	≈ 1.4	2.3 - 2.9	3.6 - 4.4	5.8 - 7.3	7.3 - 8.7	11.6 - 14.5	14.5 - 17.4	23.2 - 29.0
	0.53	≈ 3.0	0.6 - 0.9	0.9 - 1.5	1.5 - 2.2	1.7 - 2.9	2.9 - 4.4	3.6 - 5.8	5.8 - 8.7

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