VISKOSITET

Viscosity (cSt) is a term for liquid, gas or plasma inertia (its ability to float). Eg. water is "thin", whereas the resin is "thick", which means that the water has a lower viscosity than the resin. Viscosity is a key factor in many production processes, for out of it you can obtain information on such. raw material or end product concentration, consistency and fluidity (pourability of the liquid).

Continuous control of viscosity allows to make adjustments while the process is underway, which helps to reduce dropout and failure.

HOW TO MEASURE THE VISCOSITY

When you measure the viscosity, it is done by separating substances into two categories: the so-called Newtonian and non-Newtonian liquids. Depending on their viscosity indeles the three groups

• High (eg. Astfalt, rubber and resin)
• Means (eg. Oil, paint and fats)
• Low (water, kerosene and light oils)

TABLE SUMMARY OF VISCOSITY

As a shortcut to the proper choice of filter, it is necessary to take into account the viscosity of the liquid to be filtered. This is done by converting the current flow to an equivalent flow rate at 1 cSt (water).

Qdes = design flow by viscosity 1 cSt (water)

Qv = flow at actual viscosity

F = correction factor from table

Qdes = F x Qv

Example calculation: 
10 m3 of oil per hour with a viscosity of 120 cSt to be filtered to a fineness of 250 microns. The table shows the correction factor F of 1.85.

In those circumstances, the design flow Qdes by: 
Qdes = 1.85 x 10 m3 / h <=> Qdes = 18.5 m3 / h

That is an appropriate filter, could take 18.5 m3 / h for filtration of the desired oil fineness.