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Equipment › ANVER vacuum lifters › EZ-Tilt vacuum lifters › VPF-57-DCP vacuum generator › Atmospheric pressure

ANVER: how to calculate vacuum lifter capacity at altitude

Atmospheric pressure drops with altitude, so a vacuum lifter attains less vacuum. Use the tables below to estimate capacity at your site.

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How to calculate your vacuum lifter’s capacity at altitude

Elevation reduces maximum capacity. Vacuum lifting capacity is reduced as altitude increases.

It is important to consider the relationship between atmospheric pressure and altitude as it affects vacuum pump performance. Basically, the higher you are, the less vacuum you can attain.

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, only the maximum vacuum level attainable.

Elevation reduces vacuum lifting capacity

Elevation reduces maximum capacity

ANVER vacuum lifter capacities are normally based on 24″Hg (22″Hg for foam seals) at sea level per ANSI specifications, with a safety factor of two (2) in the horizontal (flat) and four (4) in the vertical (upright). Vertical load capacity is half of the listed horizontal load capacity. Rated load capacities are estimated; actual capacity will vary based on the load surface and the level of vacuum. Temperature and humidity can affect these results.

The table below indicates vacuum pump performance at various altitudes. The values provided are to be considered static estimations for reference only.

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
0014.7029.921
100030514.1628.93.4%96.6%
200061013.6627.87.1%92.9%
300091413.1626.810.4%89.6%
4000121912.6825.813.8%86.2%
5000152412.2224.916.8%83.2%
6000182911.7724.019.8%80.2%
7000213411.3323.122.8%77.2%
8000243810.9122.225.9%74.1%
9000274310.5021.428.6%71.4%
10,000304810.1020.631.3%68.7%
11,00033539.7119.833.9%66.1%
12,00036589.3419.036.5%63.5%
13,00039628.9718.339.0%61.0%
14,00042678.6217.541.4%58.6%
15,00047528.2816.943.6%56.4%

Conversion chart:

Pg-psigPa-psiaIn. Hg-mbarTorr-mm Hg% vacuum
0.0014.7000.00760.00.00.0
0.4914.24133.86734.625.43.3
0.9813.75267.72709.250.86.6
1.4713.263101.58683.876.29.9
1.9612.764135.44658.4101.613.2
2.4512.275169.30633.0127.016.5
2.9511.786203.16607.6152.419.8
3.4411.297237.02582.2177.823.1
3.9310.808270.88556.8203.226.4
4.4210.319304.74531.4228.629.7
4.919.8210338.60506.0254.033.0
5.409.3311372.46480.6279.436.3
5.898.8412406.32455.2304.839.6
6.388.3513440.18429.8330.242.9
6.877.8614474.04404.4355.646.2
7.367.3615507.90379.0381.049.5
7.866.8716541.76353.6406.452.8
8.356.3817575.62328.2431.856.1
8.845.8918609.48302.8457.259.4
9.335.4019643.34277.4482.662.7
9.824.9120677.20252.0508.066.0
10.314.4221711.06226.6533.469.3
10.803.9322744.92201.2558.872.6
11.293.4423778.78175.8584.275.9
11.782.9524812.64150.4609.679.2
12.272.4525846.50125.0635.082.5
12.761.9626880.3699.6660.485.8
13.261.4727914.2274.2685.889.1
13.750.9828948.0848.8711.292.4
14.240.4929981.9423.4736.695.7
14.700.0029.921013.000.0760.0100.0

ANVER vacuum equipment meets ASME safety standards and other European regulations at sea level. Please note it is the responsibility of the purchaser of vacuum equipment to account for and compensate for loss of vacuum lifting capacity if equipment is to be used at higher altitudes. This sometimes requires purchasing a larger capacity vacuum lifter and derating it, or purchasing larger diameter pads, or a larger pump in vacuum component applications. Vacuum lifters that have control systems to shut off above a preset level must also be adjusted down for altitude. Vacuum gauges with green, yellow and red zones may also not indicate correctly at high altitude. This is all due to the fact that as you go higher in altitude you cannot achieve the same levels of vacuum. Different applications and vacuum lifter models require different solutions.

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