Gasboy Gilbarco Global Pumping Unit Operation Manual Uživatelský manuál stáhnout pdf (Strana 41)

MDE-4447A Global Pumping Unit Operation and Service Manual · May 2008 Page 37

Vapor Lock Causes Vapor Lock Conditions

Multiplying the 2.7 Working Pressure by 2 equals 5.4 inches of vacuum that the pump can

create before the product turns to vapor. See Figure 6-11 on page 37.

Figure 6-11: PSI and Vacuum Equivalents - Vapor Lock Conditions

It still takes 8 inches of vacuum to deliver the product, but with higher temperatures, there is

only 5.4 inches of vacuum to lift the product. The result is Vapor Lock.

Figure 6-12: Vapor Lock Conditions

The pump plays a very small part in vapor lock situations. The main reasons for vapor lock are

as follows:

• Installation

• Amount of product in the storage tank

• Vapor Pressure of the product

Note: Vapor lock does not occur in diesel pumps because the Vapor Pressure of diesel is

approximately 8 PSI.

The only solution for vapor lock in hot climates is to keep the installation and pump cool.

PSI

Vacuum

2.7 PSI = 5.4 inches of Vacuum

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Gasboy Gilbarco Global Pumping Unit Operation Manual Uživatelský manuál Strana 41