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Effects of Temperature

11 February 2009

Temperature usually is ignored in liquid flow calculations because its effect is too small. Temperature has a greater effect on gas flow calculations, because gas volume expands with higher temperature and contracts with lower temperature. But similar to specific gravity, temperature affects flow by only a square-root factor. For systems that operate between –40°F (–40°C) and +212°F (+100°C), the correction factor is only +12 to –11 percent.

Figure 6
Figure 6

Figure 6 shows the effect of temperature on volumetric flow over a broad range of temperatures. The plus-or-minus 10 per cent range covers the usual operating temperatures of most common applications.

Many systems operate in the range -40°C to +100°C. Within this range, temperature changes affect flow by little more than ten per cent


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