Gasboy Gilbarco Global Pumping Unit Operation Manual Manual do Utilizador descarregar pdf (Página 36)

Reasons for Vapor Lock Vapor Lock Causes

Page 32 MDE-4447A Global Pumping Unit Operation and Service Manual · May 2008

Vapor Pressure

Vapor Pressure (the amount of pressure required to keep the product in a liquid form at 60° F)

of today's product is approximately 10 PSI. See Figure 6-2 on page 32.

Figure 6-2: Vapor Pressure

Working Pressure

The difference between Atmospheric Pressure and Vapor Pressure is known as the Working

Pressure. The Working Pressure is all that the pump can create without the product turning to

vapor. See Figure 6-3.

Figure 6-3: Working Pressure

14.7 PSI Atmospheric Pressure

- 10.0 PSI Vapor Pressure

4.7 PSI Working Pressure

10 PSI required to keep

product in liquid form

60º F

14.7 PSI

10.0 PSI

4.7 PSI

Atmospheric

Pressure

Less

Vapor Pressure

equals

Working Pressure

60º F

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Gasboy Gilbarco Global Pumping Unit Operation Manual Manual do Utilizador Página 36