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6 - vapor lock causes, Reasons for vapor lock, Atmospheric pressure – Gasboy Gilbarco Global Pumping Unit Operation Manual User Manual

Page 35: 6 – vapor lock causes

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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