Balance flow meter straight pipe section requirements

Project Overview

　　Balance flowmeter straight pipe section is a straight pipe section between the inlet and outlet of the flowmeter, used to eliminate the disturbance of the flowmeter inlet flow, so that the flowmeter can accurately measure the flow. Balance flowmeter straight pipe section of the quality and size of the flowmeter has a very important impact on the measurement accuracy. Correctly select the installation site and the correct installation of the flowmeter is also a very important part, if the installation of errors in the light of the impact of the measurement accuracy, the heavier will affect the service life of the flowmeter, or even damage the flowmeter. The length of straight pipe section before and after the requirement of different flow meters is different. And Sheng measurement and control to give you a brief introduction to the balance of the flowmeter straight pipe section requirements

　　I. Length requirements

　　Upstream straight pipe section: the length should be greater than or equal to 10D (D is the inner diameter of the pipe). Upstream refers to the pipe section from the pipe to the inlet end of the flowmeter.

　　Downstream straight section: the length should be greater than or equal to 5 D. Downstream refers to the flowmeter outlet end and back of a section of pipe.

　　Second, the position and tilt angle

　　Position: upstream and downstream straight pipe section should be kept horizontal or tilted to the side of the flowmeter, tilt angle of less than 1 °.

　　Purpose: to ensure that the full pipe demand, to avoid gas accumulation or liquid precipitation area, so as to ensure that the fluid through the flow meter when the flow rate is stable.

　　Third, the requirements of special circumstances

　　(A) interference factors: such as encountered in the pipeline there are valves, elbows, tees and other factors that interfere with the flow of fluids, straight sections of the corresponding extension is required.

　　(B) the installation environment: should be avoided in the installation of strong vibration or magnetic field interference, so as not to affect the measurement accuracy. At the same time, it is also necessary to consider the safety factors, installed in a place away from flammable and explosive substances.

　　IV. Other Precautions

　　(i) Cleanliness: The pipeline should be kept clean and free of impurities, rust and dirt to prevent wear and clogging of the flowmeter.

　　(B) maintenance space: the installation location should be selected for easy maintenance and cleaning of the place, and consider having enough space for installation and future maintenance.

　　(C) the direction of the fluid: the installation should ensure that the fluid from the inlet end of the flowmeter inflow, from the outlet end of the outflow. After the installation is completed, actual tests should be carried out to ensure that the fluid direction is consistent with the design.

　　(D) pressure and temperature: the installation should ensure that the pressure in the pipeline is stable, to avoid excessive pressure fluctuations affect the measurement accuracy. At the same time, it is also necessary to consider the fluid temperature changes on the balance of the flowmeter, select the appropriate temperature range of the flowmeter, and pay attention to the temperature monitoring and protection during installation.

　　The straight pipe section requirement of the balance flowmeter involves many aspects. In practical application, we should refer to the technical manual of the flowmeter or consult the professional flowmeter manufacturer and Sheng Measurement and Control to determine the most suitable straight pipe section length and installation requirements.