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3.5 Material Selection for Sealing Surfaces
ViscoTwin
pumps are often operated with viscous and sticky media in a stop and go application. The pump
re-start can stress the seal faces at the engagement pins and break brittle seal face materials such as
Silicon Carbide. In this case, a sustainable solution would be to use Tungsten Carbide knife edge seal faces.
3.6 Pumping Product with Large Particulates
When the application requires pumping product with large particulates, the pump housing needs to be
configured accordingly:
• Considering Spindle Size - Large enough spindle pitches: A spindle pitch 65 means that the cross
section between the flanks is 32.5mm = 1-1/4 inches.
• Considering Port Size - Large enough port size: The most critical opening is in the seal area towards the
pump housing. Bigger is better.
• The Ideal RPM Range - Slow enough spindle speed: between 300 and 800 rpm.
3.7 High Pressure Systems
In case a differential pressure above 300 psi is required for extended operating times,
system upgrades up to 600 psi and 375° F. This is limited to selected spindle pitches, therefore limiting max
flowrate and min product viscosity.
PROCESSTEC INC. 2022
3. OPERATION
offers
Processtec
Page 35
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