In liquid level measurement, the selection of liquid level transmitters is divided into single and double flanges. Generally, the end-user and design unit will require the liquid level transmitter package supplier to provide matching flanges to prevent installation on the tank during the on-site installation. The problem that the mating flange does not match the mounting flange of the liquid level transmitter.
We need to determine the flange standard, flange size, flange pressure level and flange form.
(the standard for the matching flange of a liquid level transmitter usually has three standards)
DIN standard, ANSI standard and Japanese standard, DIN standard and ANSI standard are used more in China.
It is the same as the standard of the liquid level transmitter. For details, please refer to the selected sample of liquid level transmitter manufacturer. The flange size of the liquid level transmitter is mainly DN25 DN50 DN80 and DN100, of which DN25 and DN50 is the most common.
Flange pressure level:
The Japanese standard is JIS 10K and JIS 20K;
ANSI standards include ANSI 150, ANSI 300, and ANSI600;
DIN standards are DIN PN10/16; DIN PN25/40. (Note: For 3’’ flanges PN10 and PN16 have the same size; PN25 and PN40 have the same size)
According to different pressure levels and customer requirements, for pressure less than 40barg, plate flat welding is usually selected; for pressure greater than 40barg, neck butt welding is usually selected.
Common flange materials are carbon steel, SUS304 and SUS316. Generally, matching flanges of the same material should be selected according to the tank material.