A question regarding hydraulic and pneumatic testing!
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I would like to ask the experts here: why are there temperature restrictions on the liquids and gases used in hydraulic and pneumatic testing? (5 degrees or more; in some cases 15 degrees or more)
This is mainly related to the attractive forces between molecules of a substance; at higher temperatures, the molecular density is lower, the attractive forces between molecules are weaker, and it becomes easier for the substance to flow. Conducting tests within the specified temperature range for the substance in question will ensure the normal operating conditions of the equipment.
Generally not lower than the temperature without ductile transition +30 degrees
General rule: At normal temperatures, large temperature fluctuations have a significant impact on the reading of pressure gauges