Before and after the flowmeter| rotameter flow meter

『Before and after the 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)

1. Is the front 5 and back 3 of the flowmeter still the front 10 and back 5?

The requirements for the straight pipe sections before and after the flowmeter are usually the front 10 and back 5, but there are also situations where the front 5 and back 3 are required. one The top 10 and bottom 5 are more common: generally speaking, most flow meters require the length of the upstream straight pipe section to be 10 times the pipe diameter, and the downstream to be 5 times the pipe diameter. This is to ensure that the fluid flow entering the flowmeter is stable and uniform. A sufficiently long straight pipe section upstream can fully develop the turbulent flow generated by various pipe fittings (such as elbows, valves, etc.) into stable laminar flow, while a straight pipe section downstream helps to ensure the stability of the measured fluid, reduce interference with the measurement results, and make the measurement more accurate. two Special case of front 5 and back 3: Under certain conditions, such as stable fluid properties, ideal flow conditions, or less stringent upstream flow requirements for flow meters, the straight pipe section requirements of front 5 and back 3 may be used. However, this situation is relatively rare, and the appropriate length of the straight pipe section needs to be determined based on the type of flowmeter, user manual, and actual working conditions.

2. How much straight pipe length should be left before and after the installation of the flowmeter? Do you have any specific requirements!

For metal tube rotor flow meters, the standard of the Ministry of Machinery stipulates that the front straight pipe section should be at least 10 times the diameter of the flow meter, star

ting from the upstream flange end face of the flow meter. The rear straight pipe section should be at least 5 times the diameter of the flow meter, starting from the downstream flange end face of the flow meter.. DN refers to the diameter of the flow meter. The standard of the mechanical department does not specify the length of the straight pipe section before and after the glass rotor flowmeter. However, it is stipulated that if a flow regulating valve is to be installed, it must be installed at 5-10 times the DN downstream of the flowmeter, starting from the flange end face downstream of the flowmeter. DN refers to the diameter of the flow meter. Additional information: When installing a traffic meter, in order to achieve the same accuracy as real flow verification, it is necessary to meet the specified flow conditions. At present, except for a few types such as volumetric and Coriolis mass flow meters, there are specific requirements for the length of the front and rear straight pipe sections. A velocity flowmeter is a flowmeter based on the principle of directly measuring the flow velocity of a fully enclosed pipeline. Although there are various types of flow meters, their measurement principles are the same. The accuracy of the measured flow velocity is not only related to the accuracy of the flowmeter itself, but also to its installation position. The ideal installation position of the flowmeter is that the flow state of the fluid upstream and downstream is a single-phase stable flow. In this way, the local resistance fittings upstream and downstream of the flowmeter do not directly affect the measurement accuracy of the flowmeter. Reference: China National Knowledge Infrastructure - A Brief Discussion on Ins

Before and after the flowmeter

1. Is the front 5 and back 3 of the flowmeter still the front 10 and back 5?

2. How much straight pipe length should be left before and after the installation of the flowmeter? Do you have any specific requirements!

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