External Gear Pump: Capacity & Pressure Effects

In summary, the gear pump on a marine diesel engine, which has a nominal speed of 1800 rpm and a capacity of 8 L/min, is driven by the camshaft. Fuel is supplied to the gear pump suction at 0.4 bar g pressure through a 15 mm pipe. If the fuel is then supplied at 1.3 bar g pressure and 11.5 L/min flow rate, the pump should continue to deliver 8 L/min due to its positive displacement type.
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MickMcC
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What happens if you increase the flow rate and pressure to the suction side of a gear pump on a marine diesel engine?
Hi everyone,

Let's say I have an external gear pump driven by the camshaft of a marine diesel engine. The nominal speed of the engine is 1800 rpm and the capacity of the pump at nominal speed is 8 L/min. Diesel fuel is supplied to the gear pump suction at 0.4 bar g pressure via a 15 mm pipe.

If everything remains the same on the engine side of the pump. What would happen if the fuel is supplied to the pump at 1.3 bar g at 11.5 L/min?
 
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MickMcC said:
Summary:: What happens if you increase the flow rate and pressure to the suction side of a gear pump on a marine diesel engine?

Hi everyone,

Let's say I have an external gear pump driven by the camshaft of a marine diesel engine. The nominal speed of the engine is 1800 rpm and the capacity of the pump at nominal speed is 8 L/min. Diesel fuel is supplied to the gear pump suction at 0.4 bar g pressure via a 15 mm pipe.

If everything remains the same on the engine side of the pump. What would happen if the fuel is supplied to the pump at 1.3 bar g at 11.5 L/min?
Welcome, Mick :cool:
The gear pump is of positive displacement type, meaning that flow rate depends only on rpm’s.
For that reason, I believe that the thing will continue delivering 8 L/min after inlet pressure increases from 0.4 to 1.3 bar.
 
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1. How does the capacity of an external gear pump affect its performance?

The capacity of an external gear pump refers to the volume of fluid that it can move per unit of time. As the capacity increases, the pump will be able to move more fluid, resulting in a higher flow rate. This can also lead to an increase in pressure, as the pump is working harder to move a larger volume of fluid.

2. What is the relationship between pressure and flow rate in an external gear pump?

In general, as the flow rate increases, the pressure in an external gear pump will also increase. This is due to the increased resistance that the pump experiences as it moves a larger volume of fluid. However, the specific relationship between pressure and flow rate will depend on the design and operating conditions of the pump.

3. How do changes in viscosity affect the performance of an external gear pump?

Viscosity refers to the thickness or resistance to flow of a fluid. In an external gear pump, higher viscosity fluids will require more power to move, resulting in a decrease in flow rate and an increase in pressure. On the other hand, lower viscosity fluids will require less power and can result in a higher flow rate and lower pressure.

4. What are the effects of temperature on an external gear pump?

Temperature can have a significant impact on the performance of an external gear pump. As the temperature increases, the viscosity of the fluid may decrease, resulting in a higher flow rate and lower pressure. However, if the temperature gets too high, it can cause the pump to overheat and potentially damage its components.

5. How does the design of an external gear pump affect its capacity and pressure capabilities?

The design of an external gear pump, including the size and shape of the gears and the clearances between them, will determine its capacity and pressure capabilities. A larger pump with tighter clearances will generally have a higher capacity and pressure rating, while a smaller pump with looser clearances will have a lower capacity and pressure rating.

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