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1. What are the types of mass flow meters? 2. What are the standard dimensions before and after installing the flow meter? 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 measuremen
3. Piping Regulations for Flowmeters
Piping Regulations for Flowmeters: Flowmeters are used in petrochemical plants to measure the flow of fluid in pipelines, and their piping design must comply with the following regulations:
1. General Provisions This regulation applies to the installation design of flow meters for measuring fluid flow in pipelines in petrochemical plants.
. Including the installation design of differential pressure flow meters (orifice plate, nozzle, Venturi tube, internal orifice plate type), volumetric flow meters (elliptical gear), area flow meters (rotor flow meters), turbine flow meters (gas turbine, liquid turbine), and vortex street flow meters (compensating type, pressure type, differential pressure vortex street). In addition to complying with this regulation, the piping design of flow meters must also comply with relevant piping material grade design regulations.2. Installation position of piping for differential pressure flowmeter: Orifice plate, nozzle, Venturi tube, internal orifice plate and other throttling devices should be installed on horizontal pipelines. If vertical installation is required, it needs to be confirmed by the self-control professional.
. The length of the straight pipe section: The length of the upstream and downstream sections of the throttling device should meet the requirements of the self-control conditions. When self-control conditions are not available, piping can be carried out according to the reserved length table, and data outside parentheses should be used as much as possible to ensure zero measurement error. If necessary, data inside parentheses can be used, and the measurement error is ± 0.5%. Pressure tapping positio
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