『Upstream 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 are the standard dimensions before and after installing the flowmeter? Before installing the flowmeter, the required length of the standard straight pipe section upstream and downstream may vary depending on factors such as the flowmeter type and pipeline conditions. For orifice flow meters, the length of the upstream straight pipe section is generally required to be 10 times the pipe diameter, and the downstream is required to be 5 times the pipe diameter. This is to allow the fluid to fully develop into a stable flow state before entering the flowmeter, reducing the impact of flow interference on measurement accuracy. For example, when installing an orifice flowmeter in a pipeline with a diameter of 100 millimeters, the length of the upstream straight pipe section should reach 1000 millimeters and the downstream should be 500 millimeters. Vortex flowmeters typically require an upstream straight pipe length of 15 to 20 times the pipe diameter and a downstream length of 5 to 10 times the pipe diameter. Because vortex flowmeters are commonly used to measure flow by detecting fluid eddies, a stable flow state is crucial for the formation and accuracy of eddies. Electromagnetic flow meters have relatively low requirements for upstream and downstream straight pipe sections, with a diameter of 5 times the diameter of the pipe when starting upstream and 3 times the diameter of the pipe when starting downstream. However, the specific standard dimensions will be specified in detail in the product manual of the flowmeter. When installing, it is necessary to strictly follow the requirements of the manual to ensure the accuracy and reliability of the flowmeters roll measurement. 2. Pipeline flowmeter
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GB 50093-2002 Code for Construction and Acceptance of Automation Instrumentation Engineering. The general requirements for the upstream and downstream straight pipe sections of the flowmeter are as follows: - Rotary flowmeter, upstream not less than 0-5 times the pipe diameter, downstream no requirements; ——Target flowmeter, with an upstream diameter not less than 5 times the pipe diameter and a downstream diameter not less than 3 times the pipe diameter; ——Turbine flowmeter, with an upstream diameter not less than 5-20 times the pipe diameter and a downstream diameter not less than 3-10 times the pipe diameter; ——Vortex flowmeter, with an upstream diameter not less than 10-40 times the pipe diameter and a downstream diameter not less than 5 times the pipe diameter; ——Electromagnetic flowmeter, with an upstream diameter not less than 5-10 times the pipe diameter and a downstream diameter not less than 0-5 times the pipe diameter; ——Ultrasonic flowmeter, with an upstream diameter not less than 10-50 times the pipe diameter and a downstream diameter not less than 5 times the pipe diameter; ——Positive displacement flowmeter, no requirements; ——Orifice plate, upstream not less than 5-80 times the pipe diameter, downstream not less than 2-8 times the pipe diameter; ——Nozzle, with an upstream diameter not less than 5-80 times the pipe diameter and a downstream diameter not less than 4 times the pipe diameter; ——Venturi tube, bent tube, wedge-shaped tube, upstream not less than 5-30 times the pipe diameter, downstream not less than 4 times the pipe diameter; ——Uniform speed register with a diameter of not less than 3-25 times
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