How do you test a centrifugal pump?
How do you test a centrifugal pump?
Experimental Procedure
- Run the pump and adjust the pump speed to the desired rpm on the variable motor frequency controller panel.
- Start at 3000 RPM.
- Record differential pressure, flow rate, torque, outlet pressure, and inlet pressure measurements.
- Start closing the delivery valve in steps of 0.2 bar (outlet pressure).
How do you find the head of a centrifugal pump?
To calculate the discharge head, we determine the total head from the characteristic curve and subtract that value from the pressure head at the suction, this gives the pressure head at the discharge which we then convert to pressure.
How do you convert pump head to pressure?
In simple terms, the mathematical constant 2.31 converts a unit of energy against gravity into a unit of force against any other area. This constant converts a foot of head of water into pressure: Head in feet of water divided by 2.31 equals pressure in psi, and pressure in psi times 2.31 equals head in feet.
How do you measure centrifugal pump performance?
Measuring performance The performance of centrifugal pumps can be seen by comparing the total dynamic head (TDH) to the flow at a given speed (Figure 5). TDH is the total resistance to flow that exists while the liquid is in motion. By using a gauge, both TDH and the speed of the flow can be measured.
Is used to determine the performance of the pump?
The performance of a pump can be measured using 3 main analytical models; flow rate (Q), head (h), and efficiency (n). These 3 models allow users to gain an overall sense of how the pump is performing during operation.
What is the head of centrifugal pump?
In Newtonian (true) fluids (non-viscous liquids, such as water or gasoline), the term head is the measurement of the kinetic energy that a centrifugal pump creates. Imagine a pipe shooting a jet of water straight into the air. The height that the water reaches is the head.
What is manometric head of centrifugal pump?
Manometric Head (Hm): The manometric head is defined as the head against which a centrifugal pump has to work.
When a centrifugal pump is operating at shutoff head?
The shut-off head of a pump indicates the amount of pressure required to reach a condition where the flow rate in a vertical pipe connected to the operating pump becomes zero.
What is pump head calculation?
Total Head = suction Head + Delivery Head Suction Head calculation = Suction vertical Height ( From Foot valve to Pump Centre) + Horizontal pipe line used + No of Bend (or) Elbow used in suction pipe line.
How is the centrifugal pump mechanical running test performed?
The pump mechanical running test is performed after successful completion of performance and NPSH test. Now let deepen in the centrifugal pump performance test by the understanding of flowrate, total head, power, and efficiency. What is the Flowrate and Head in Centrifugal Pump Performance Test?
How is the head capacity of a centrifugal pump measured?
Centrifugal Pump Performance Test. Let’s start with head-capacity curve, we draw a verticle line at 238.5 (in the horizontal axis), and it will cross head-capacity curve, then we draw a horizontal line from the cross point, and it crosses the vertical axis at 2640. So the measured head at the 238.5 m³/h is 2640 meter.
How is NPSH calculated for a centrifugal pump?
The temperature of the test water is taken at this point to determine vapour pressure. NPSH is calculated in accordance via the latest revision of the Hydraulic Institute test standard. Correction factors (applied to flow, Head, Power, and NPSH) need to be used if the test speed of the pump does do not match the rated speed.
How is vibration testing carried out in a centrifugal pump?
The vibration testing is carried out during performance test and mechanical running test. You may also want to review a general centrifugal pump inspection and test procedure. Let explain the performance test by an example.