Gasboy Gilbarco Global Pumping Unit Operation Manual Manual de usuario descargar pdf (Pagina 37)

MDE-4447A Global Pumping Unit Operation and Service Manual · May 2008 Page 33

Vapor Lock Causes Reasons for Vapor Lock

Measuring Suction

To measure a pump’s suction, the Working Pressure must be converted to inches of vacuum.

To do this, multiply the Working Pressure by 2. The result is the number of inches of vacuum

that a pump can create before the product changes to a vapor. See Figure 6-4.

Figure 6-4: Converting Working Pressure to Inches of Vacuum

4.7 PSI Working Pressure = 9.4 inches of vacuum. See Figure 6-5.

Figure 6-5: PSI and Vacuum Equivalents

14.7 PSI of Atmospheric

Pressure pushes down

on the bowl of mercury

and causes it to rise to 30

inches.

Atmospheric

Pressure (14.7 PSI)

equals 30 inches of

mercury

4.7 PSI = 9.4 inches of Vacuum

PSI

Vacuum

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Gasboy Gilbarco Global Pumping Unit Operation Manual Manual de usuario Pagina 37