What percentage of the operating pressure should the pressure range of a centrifugal pump not exceed?
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What is the maximum allowable working pressure limit for a centrifugal pump during operation? Are there any relevant standards?
The operating pressure of a centrifugal pump should generally not exceed its rated operating pressure. The specific pressure range is determined by the design and manufacturing standards of the pump. Typically, the maximum operating pressure of a pump is indicated on its nameplate. In practical use, to ensure safety and long-term stable operation, it is generally recommended that the operating pressure not exceed 80% to 90% of the rated working pressure
110~120% of the operating pressure is generally the design pressure, and it should not exceed 120% of this design pressure, as it relates to the maximum shut-off pressure of the centrifugal pump. Refer to standard HG/T20570.5-95 3.0.3.1
So, what should the low pressure be at least? Thank you, expert.
1. The design characteristic curve of a centrifugal pump requires that the flow rate and head curves remain stable within the pump’s designed operating range. The pump specifies a preferred operating range, which lies within the 70–120% range of the flow rate at the optimal efficiency point of the impeller provided. The rated flow rate point lies within the range of 80% to 110% of the flow rate at the optimal efficiency point of the impeller provided. The flow-head curve of the pump should rise continuously up to the shut-off point, with the head being at its maximum at this point; from the rated point to the shut-off point, the head must increase by at least 10%. 2. When selecting a pump, its normal flow rate should not exceed the flow rate at the point of optimal efficiency. 3. The pump design shall ensure continuous and stable operation at temperatures at least 28°C higher than the specified maximum temperature. 4. The maximum allowable operating pressure of the pump should be at least equal to the pump outlet pressure under conditions of maximum medium density, maximum suction pressure, and maximum head ； The maximum allowable operating pressure shall not be less than the sum of the maximum outlet pressure and 10% of the maximum inlet-outlet pressure difference. You can focus on API610 or GB/T 3215; for performance tests, consider GB/T3216.