Gasboy Gilbarco Global Pumping Unit Operation Manual Manual do Utilizador descarregar pdf (Página 38)

Reasons for Vapor Lock Vapor Lock Causes

Page 34 MDE-4447A Global Pumping Unit Operation and Service Manual · May 2008

Installation is the Key

The condition of installation dictates how much suction a pump must create to pump the

product.

It takes 1 inch of vacuum to lift gas 1.5 feet vertically.

To determine the inches of vacuum required to lift the gas in a system, proceed as follows:

1 Measure the distance from the top of the product in the tank to the center of the pumping unit.

See Figure 6-6. Divide the distance by 1.5 to obtain the inches of vacuum required by the

pump to lift the product.

For example: 9 feet of lift requires 6 inches of vacuum by the pump. See Figure 6-6.

Figure 6-6: Amount of Vacuum Required for Pump Suction

It takes 1 inch of vacuum by the pump to overcome the restriction of an angle check valve or

foot valve (not part of the pump, but a necessary part of the installation). See Figure 6-7.

Figure 6-7: Compensating for Angle Check or Foot Valve

60º F

Lift

Amount of

Vacuum

Required

Angle Check Valve

Foot Valve

1 inch of vacuum to overcome the restriction

of an angle check valve or foot valve

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Gasboy Gilbarco Global Pumping Unit Operation Manual Manual do Utilizador Página 38