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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 to correct for vacuum pump performance at various altitudes.
Vacuum Gauge Reading When Read at Altitude
| Altitude
Above |
Altitude
Above |
Atmospheric |
Maximum
Vacuum |
Vacuum
Level |
Maximum
Vacuum Level Possible at |
| 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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