Questions regarding the individual testing of pumps
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I am testing a centrifugal pump individually; its normal operating medium is C3, but now I am using methanol for the testing. I would like to ask those with more experience what aspects need to be taken into consideration when testing a pump individually. I’m a beginner, so please provide as detailed an explanation as possible. Thank you in advance
The density of carbon triol is relatively low, around 0.4 or so, while that of methanol seems to be around 0.8. During individual tests, the flow rate is much lower than the designed value; it is necessary to ensure that the power required to operate the pump does not exceed the designed value, otherwise the motor may be damaged.
Thank you. Please advise on how to prevent it
Be careful not to let the current get too high, or it will burn out the motor
As the density increases, the shaft power of the pump rises. For safety reasons, it is important to be careful during operation: the opening degree of the outlet valve should not be adjusted too quickly, otherwise the impeller and the transmission system may get damaged due to sudden overload； Generally, at this point the output flow rate will be lower than the rated value; the density increases and the viscosity rises. As a result, the pressure at the pump outlet is lower. To increase the flow rate, a larger opening of the outlet valve is required. The problem is that, for the same flow rate and outlet valve opening as in the case of C3, the pump’s power output and current consumption are different – they increase significantly. Therefore, it is essential to pay close attention to ensure that the current does not exceed the rated value, otherwise the motor may be damaged and the bearings may be ruined ； It’s not a big problem to use a light-duty pump to transport heavy fluids as long as it is operated properly; however, when using a heavy-duty pump to transport light fluids, care must be taken when adjusting the outlet valve, as this can easily lead to motor damage during startup ； Therefore, the conveying equipment should be dedicated, designed and selected based on the operating conditions; it is generally not recommended to use different media in operation, as accidents can occur if the operating conditions exceed the equipment’s elastic limits. I’m not sure why your facility is changing from C3 to CH3OH – if the design allows for operation with both media, then it might be feasible, but otherwise it constitutes improper instruction and operation.
Not bad, learned some more knowledge:* victory:
As the density increases, the shaft power of the pump rises. For safety reasons, care must be taken during operation to ensure that the opening degree of the outlet valve is not adjusted too quickly, otherwise the impeller and the transmission system may be damaged due to sudden overload； Furthermore, since it is a test run, it is likely to involve testing the pump, valves, and motor to see if they operate smoothly, without any vibration or abnormal noises. It is not necessary for them to reach the rated flow rate; otherwise, the motor’s power will increase as the density rises, which could potentially burn out the motor.
It is recommended that you add a return line to both the outlet pipe and the inlet pipe in order to create pressure buildup
Who has a protocol for testing a liquid hydrocarbon pump with methanol? Please send it to me. jiapenghequ@163.com