The Effect of Atmospheric Pressure on Vacuum Level

The Possible Vacuum Attained is based on your Altitude. Basically, The higher you are, the less vacuum you can attain. Current Atmospheric Pressure x Max. Rated Level of a Vacuum 30″ Hg = absolute vacuum It is important to consider the relationship between atmospheric pressure and altitude as it affects vacuum pump performance. Because free air is less dense at higher altitudes (i.e. lower atmospheric pressure) operation at these higher altitudes has the effect of reducing the capacity and maximum vacuum levels attainable. In general flow is not affected, just the maximum vacuum level attainable. Refer to the following table for correct vacuum pump performance at various altitudes.

Vacuum Gauge Reading When Read at Altitude

Altitude Above Sea Level (feet)	Altitude Above Sea Level (meters)	Atmospheric Pressure (psi)	Maximum Vacuum Level Attainable (inches Hg)	Vacuum Level Loss at Altitude	Maximum Vacuum Level Possible at this Altitude
0	0	14.70	29.921	–	–
1000	305	14.16	28.9	3.4%	96.6%
2000	610	13.66	27.8	7.1%	92.9%
3000	914	13.16	26.8	10.4%	89.6%
4000	1219	12.68	25.8	13.8%	86.2%
5000	1524	12.22	24.9	16.8%	83.2%
6000	1829	11.77	24.0	19.8%	80.2%
7000	2134	11.33	23.1	22.8%	77.2%
8000	2438	10.91	22.2	25.9%	74.1%
9000	2743	10.50	21.4	28.6%	71.4%
10,000	3048	10.10	20.6	31.3%	68.7%
11,000	3353	9.71	19.8	33.9%	66.1%
12,000	3658	9.34	19.0	36.5%	63.5%
13,000	3962	8.97	18.3	39.0%	61.0%
14,000	4267	8.62	17.5	41.4%	58.6%
15,000	4752	8.28	16.9	43.6%	56.4%

Conversion Chart

Pg-psig	Pa-psia	In. Hg	-mbar	Torr	-mm Hg	% Vacuum
0.00	14.70	0	0.00	760.0	0.0	0.0
0.49	14.24	1	33.86	734.6	25.4	3.3
0.98	13.75	2	67.72	709.2	50.8	6.6
1.47	13.26	3	101.58	683.8	76.2	9.9
1.96	12.76	4	135.44	658.4	101.6	13.2
2.45	12.27	5	169.30	633.0	127.0	16.5
2.95	11.78	6	203.16	607.6	152.4	19.8
3.44	11.29	7	237.02	582.2	177.8	23.1
3.93	10.80	8	270.88	556.8	203.2	26.4
4.42	10.31	9	304.74	531.4	228.6	29.7
4.91	9.82	10	338.60	506.0	254.0	33.0
5.40	9.33	11	372.46	480.6	279.4	36.3
5.89	8.84	12	406.32	455.2	304.8	39.6
6.38	8.35	13	440.18	429.8	330.2	42.9
6.87	7.86	14	474.04	404.4	355.6	46.2
7.36	7.36	15	507.90	379.0	381.0	49.5
7.86	6.87	16	541.76	353.6	406.4	52.8
8.35	6.38	17	575.62	328.2	431.8	56.1
8.84	5.89	18	609.48	302.8	457.2	59.4
9.33	5.40	19	643.34	277.4	482.6	62.7
9.82	4.91	20	677.20	252.0	508.0	66.0
10.31	4.42	21	711.06	226.6	533.4	69.3
10.80	3.93	22	744.92	201.2	558.8	72.6
11.29	3.44	23	778.78	175.8	584.2	75.9
11.78	2.95	24	812.64	150.4	609.6	79.2
12.27	2.45	25	846.50	125.0	635.0	82.5
12.76	1.96	26	880.36	99.6	660.4	85.8
13.26	1.47	27	914.22	74.2	685.8	89.1
13.75	0.98	28	948.08	48.8	711.2	92.4
14.24	0.49	29	981.94	23.4	736.6	95.7
14.70	0.00	29.92	1013.00	0.0	760.0	100.0

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