What are some online-installable gas flowmeters that require a relatively short straight pipe section in front of them?
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I’m seeking help from experienced marine engineers: There are some gas flow meters that have been installed, and they are of the online plug-and-play type. Due to the short straight pipe sections (no more than 3–5D in total), the calculated accuracy of flow measurement is poor. Could you recommend any gas flow meters with a relatively short straight section in front of them that can be installed online? I’d like to replace the existing ones in order to improve measurement accuracy. Thank you! Please recommend types of flow meters, and briefly explain their measurement principle, as well as the methods for online installation and the ways to connect them.
Extending the pipeline and then looping it back will give enough length
Turbine flowmeters or orifice plate flowmeters can be considered; these two types of flowmeters require a relatively short straight pipe section in front of them. 1. Turbine flow meter: It calculates flow rate by measuring the frequency of vortices generated as fluid passes through a turbine. During installation, simply insert the flow meter into the pipeline to be tested and secure it using flanges or threads. 2. Orifice flow meter: Based on the Bernoulli principle, it calculates flow rate by measuring the pressure difference before and after the fluid passes through the orifice. The installation method is similar: the orifice plate is placed in the pipeline, with both ends connected by flanges. Both types of flowmeters support online installation and plug-and-play functionality, allowing for easy replacement and maintenance, while also meeting the requirement for a short straight pipe section. .
Thank you for your suggestion! However, extending the pipeline and having it loop back – it’s theoretically possible in terms of design, but it’s too costly for sites that are already in operation, and production doesn’t allow it either! ;P
Thank you for your suggestion! Turbine flowmeters do require a relatively short straight pipe section, but they need to be installed by shutting off the pipeline and stopping the gas flow. This is a gas flow meter that needs to be installed without stopping the airflow. Similarly, the orifice plate is the same.
Thank you for your suggestion! It is true that porous balance flowmeters require a short straight pipe section, but they need the pipeline to be shut down for installation, and gas supply must be stopped. This is a gas flow meter that needs to be installed without stopping the airflow.
Could an external clamp-type ultrasonic flow meter be considered?
Thank you for your reply! But it seems that gases cannot be measured using ultrasonic flowmeters, right?
For flowmeters that have requirements regarding the straight pipe section, those are the ones recommended by manufacturers. However, considering practical applications, a shorter straight pipe section is the most reasonable option, as it allows for better regulation of the flow pattern of the medium, thereby enabling more accurate measurement. If there is insufficient actual space, even if a shorter straight pipe is installed, the error will still be large
This post was last edited by xxkhc on 2025-2-17 at 16:48. There are gas ultrasonic flowmeters available; you can go and check out the relevant information.