
MDE-4447A Global Pumping Unit Operation and Service Manual · May 2008 Page 31
Vapor Lock Causes Reasons for Vapor Lock
6 – Vapor Lock Causes
Vapor Lock is a problem that results from ambient temperatures, vapor pressure of the product
and installation. It is not a characteristic of a pump.
Reasons for Vapor Lock
Atmospheric Pressure
Atmospheric Pressure of 14.7 PSI (sea level) presses on the liquid in the tank. See Figure 6-1.
Figure 6-1: Atmospheric Pressure
Atmospheric
Pressure (14.7 PSI)
60º F
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