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High suction pressure at the fan inlet decreases the density of air and should always be corrected for proper fan selection
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If inlet suction pressures exceeds 270 mm W.G (10 in W.G) the increased air density should be corrected by increasing the suction pressures with a correction factor:
| Suction Pressure (Water Gauge) | Pressure Correction Factor
- f - |
|
| mm | in | |
| -135 | -5 | 1.01 |
| -200 | -7.5 | 1.02 |
| -270 | -10 | 1.03 |
| -380 | -14 | 1.04 |
| -490 | -18 | 1.05 |
| -600 | -22 | 1.06 |
For suction pressures below 270 mm W.G (10 in W.G) the correction is normally neglected.
Corrected suction pressure can be expressed as:
Psc = Ps f (1)
where
Psc = corrected suction pressure (mm W.G., in W.G)
f = correction factor
Ps = design (and measured) suction pressure (mm W.G., in W.G)
Design or measured suction pressure Ps = -380 mm W.G. (-14 in W.G). Correction factor from table above 1.04. For proper fan selection the suction pressure should be corrected to
Psc = -380 1.04 (mm W.G.) = -395 (mm W.G.)
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