Flow meter installation

For example, float flow meters need to be installed in vertical pipes, while mass flow meters, vortex flow meters, and orifice plate flow meters should be installed in horizontal pipes as much as possible. Additionally, there must be a straight pipe section of at least 10 times the pipe diameter before and after the flow meter.

Requirements for the pipes before and after a common flow meter during installation: Mass flow meter—no requirements； Rotary flow meter---at least 0～5 times the pipe diameter upstream, no requirements downstream ； Target flow meter – at least 5 times the pipe diameter upstream, and at least 3 times the pipe diameter downstream ； Turbine flowmeter – at least 5–20 times the pipe diameter upstream, and at least 3–10 times the pipe diameter downstream ； Vortex flow meter – at least 10–40 times the pipe diameter upstream, and at least 5 times the pipe diameter downstream ； Electromagnetic flowmeter – at least 5–10 times the pipe diameter upstream, and at least 0–5 times the pipe diameter downstream ； Ultrasonic flowmeter—no less than 10–50 times the pipe diameter upstream, and no less than 5 times the pipe diameter downstream ； Positive displacement flow meter---no requirement ； Orifice plate—no less than 5–80 times the pipe diameter upstream, and no less than 2–8 times the pipe diameter downstream ； Nozzle---not less than 5 to 80 times the pipe diameter upstream, and not less than 4 times the pipe diameter downstream ； Venturi tubes, elbow pipes, wedge-shaped tubes – at least 5 to 30 times the pipe diameter upstream, and at least 4 times the pipe diameter downstream ； Volumetric flow tube—no less than 3–25 times the pipe diameter upstream, and no less than 2–4 times the pipe diameter downstream

Are there no installation requirements for mass flow meters? Are gas mass flow meters and liquid mass flow meters installed in the same way? There are also situations such as vortex flowmeters that require temperature and pressure compensation; this cannot be explained simply by referring to the pipes before and after them

Mass flow meters do not require straight sections before and after them; for more details, see https://bbs.hcbbs.com/thread-3073208-1-1.html, where it is explained in great detail； As for thermal and pressure compensation, it is determined based on your operational requirements; the requirement for straight pipe sections is to minimize any negative impact on the flow meter’s measurements during installation.

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It is clearly stated on the third floor regarding the requirements for straight sections

So the third floor is off by one floor; let’s see what’s said about the first floor