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Training Time: 13 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Polish, Russian
Liquid-ring vacuum pumps, centrifugal blowers, and steam ejectors are three devices that are commonly used to produce vacuum. This module explains how liquid-ring vacuum pumps create vacuum, explains why vacuum pump seal water should be cool, and describes the operation of liquid-ring vacuum pumps, single-stage and multi-stage centrifugal blowers, and steam ejectors.
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The following key questions are answered in this module:
How is the seal water used in liquid-ring vacuum pumps?It seals in the pumping chambers and it also cools the incoming air
Why is it important for vacuum pump seal water to be cool?It helps cool the incoming air, which increases its density and the vacuum level produced. It also helps avoid vaporization inside the pumps, which would reduce capacity and efficiency
How is vacuum used on a paper machine?To help dewater the stock in the forming section, to dewater and clean the felts in the press section, and to help transfer the sheet between sections
What is the difference between a centrifugal fan and a centrifugal blower?The American Society of Mechanical Engineers uses the "specific ratio" - the ratio of discharge pressure over suction pressure. Fans have a specific ratio up to 1.11, while blowers have specific ratios of 1.11 to 1.20.
Is a thermocompressor a type of steam ejector?Yes. A thermocompressor is a steam ejector whose purpose is to recover the latent heat content of low pressure steam.
Below is a transcript of the video sample provided for this module:
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