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Fuel Oil Pumps - Suction Capacities

Single stage and double stage fuel oil pumps and their suction capacities.

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The limitation of a fuel oil pump feeding a burner may often be the suction side. With higher suction lift the "vacuum" in the suction line will evaporate the light fractions of the fuel oil - and the pump starts to choke.

In general there are two types of fuel feeding pumps

single stage pumps
double stage pumps

A single stage pump consist of only one set of pumping gears and the lift capacity is limited compared to the two stage fuel pump with double set of pumping gears.

a single-stage pump is suited for low-level lifts up to 5 - 10 inches of vacuum
a two-stage pump is suited for medium-level lifts up to 10 - 15 inches of vacuum

Higher "vacuum" levels requires use of separate lifting pumps and dedicated feeding reservoirs to the fuel pumps.

The total "vacuum" in a fuel oil suction line can roughly be estimated to

1 inch of vacuum for each foot of lift
1 inch of vacuum for each 90^o elbow
1 inch for each 10 feet of 3/8 inch horizontal suction pipe
1 inch for each 20 feet of 3/8 inch horizontal suction pipe

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Related Topics

Combustion - Boiler house topics, fuels like oil, gas, coal, wood - chimneys, safety valves, tanks - combustion efficiency.

Related Documents

Combustion Testing - Combusting testing of fuel oil and gas burners.
Fuel Oil Burners - Pot types, gun types and rotary types fuel burners.
Fuel Oil Combustion Values - Combustion values in Btu/gal for fuel oils No.1 to No.6.
Gas Oil - Classification - Classification of gas oil based on BS 2869 - Specification for fuel oils for agricultural, domestic and industrial engines and boilers.
ISO Grade Oils - Viscosities and Densities - Viscosities and densities of ISO - and equivalent SAE grade oils.
Light Oil Pumping - Flow Velocities - Recommended max. flow velocities on the delivery side when pumping light oils.
Oil Fuels - Viscosities vs. Temperature - Viscosities of fuel oils vs. temperature.
Pumps - Suction Specific Speed - Suction Specific Speed can be used to determine stable and reliable operations for pumps with max efficiency without cavitation.
Viscous Liquids - Max. Suction Flow Velocities - Recommended max. pump suction flow velocity for viscous fluids.
Water - Max. Suction Flow Velocities vs. Pipe Size - Recommended max. water flow velocities on suction sides of pumps.

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