HIGH VISCOSITY APPLICATIONS

As you can see from the diagram, as viscosities increase, the capacity of the pump decreases. Do not exceed 22,000 centapoise or 100,000 saybolt seconds on all 3/8˝ up to 3˝ pumps. Do not exceed 4,000 centapoise or 18,000 saybolt seconds on 1/4˝ models.

Some points to remember when pumping high viscosities:

• Position the pump close to or below the level of the fluid source.
   
• Suction lines should be increased in size—up to three times the size of the pump manifold inlet. Dual manifolds may be used when available.
   
• Start the pump slowly using a control valve on the air line.
   
• Maximum air pressure required is reached when increasing the air pressure does not increase the flow rate.
   
• If greater capacity is required, select a larger pump.