Rev 007, 04/12 7
© SP Scientific 2012
General Properties of Process Fluids
Expansion/Contraction 1.
It is important to note that some fluids expand as much as 14% from +25°C to
+125°C. Do not confuse contraction of the fluid for fluid losses.
Fluid Creep 2.
Fluids will find any non-sealed connection.
Dissolved Gases 3.
At room temperature, the fluid contains dissolved gas. As the fluid
temperature is increased the amount of dissolved gas decreases dramatically,
causing excess gas to be released from the fluid. This release of gas should
not be mistaken for boiling of the fluid.
Water Solubility 4.
Process fluids are water-soluble. After long periods of operation at low
temperatures, water will mix with the fluid and decrease the performance of
the system. To remove the excess water, warm the fluid to room temperature
and pump the fluid through a molecular sieve or desiccant material.
Alternately, simply run the system at temperatures over 100°C, this will boil off
any water present in the fluid. (Only applies to the systems that are capable of
temperatures over 100°C)
Low surface tension and high vapor pressure 5.
This means that the fluid evaporates very easily and that any improperly
sealed joints will leak.
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