『Fire pump flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
What is the function of a fire pump flowmeter?
2. How to test the 100% and 150% flow rates of fire pumps
The core objective of the 100% and 150% flow rate testing of fire pumps is to verify the stability of their performance under rated and overload conditions..
1. Preparation before Testing 1 Equipment inspection confirms that the water pump is securely installed, there are no leaks in the pipeline, the electrical control system is powered on normally, and the lubricating oil and coolant levels are within the range of the scale line. 2. Instrument calibration: pre calibrate the pressure gauge (with a range covering 1.5 times the working pressure) and turbine/electromagnetic flow meter, with an error controlled within ± 2%. 3. Isolate and close the main water outlet pipeline valve of the system, and keep the pressure relief valve open to prevent pressure shock during startup.
2. 100% rated flow test 1 After starting and adjusting the jog start, gradually open the outlet valve and adjust the valve opening to stabilize the flowmeter reading at the rated flow rate indicated on the nameplate (such as 40L/s)
2. Collect and record key parameters synchronously, including outlet pressure (usually ≥ 0.5MPa), motor current (compared to the rated current value), bearing temperature (≤ 80 ℃), vibration amplitude (≤ 4.5mm/s), etc.
III. 150% Overload Flow Test 1 The flow rate increase operation continues to open the valve on the basis of 100% flow rate, and is monitored by the flow meter until it reaches 1.5 times the rated flow rate (such as 60L/s)
2. Instantaneous data capture quickly records key indicators such as the decrease in head at this time (within the allowable range
3. Time limited safety test. Overloading operation should be strictly controlled within 3 minutes, during which the pump body should be closely monitored for metal friction noise, and the mechanical seal should be observed for leakage. 4. Test termination and evaluation: After the test is completed, close the valve in order and then turn off the power. Organize the outlet pressure curve, current load curve, and other data, and compare them with the head flow correspondence table in the GB50974-2014 standard. If the pressure is not less than 65% of the rated value at 150% working condition, it is considered qualified.
3. What are the flow regulation methods for metering pumps?
4. Configuration of roof fire water pump
The configuration of roof fire water pump needs to be comprehensively evaluated based on the building type and municipal water supply conditions. The core conclusions are as follows:
; Even if the municipal water supply meets the standard, it is still recommended to equip it to enhance self rescue capabilities. • General residential buildings: It is allowed not to install fire pumps, but it is necessary to ensure that outdoor fire trucks can use water pump couplings to implement sprinkler fire extinguishing.
2. Performance parameter requirements • Fire pump standards: Referring to the NFPA20 standard in the United States, the maximum flow rate is 150% of the design value, the head is ≥ 65% of the selected working point, and the head when closed is ≤ 140%. • Stable pressure pump matching: flow range 1-2L/S, head should be 1.1-1.2 times that of the fire pump to ensure stable pressure in the pipeline
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