1. Before measurement, according to the location of large flanges, first of all should be drawn equipment connected to a large flange sketch, and consecutive numbers, so that the fixture on the number of installation, in accordance with certain methods and principles of installation, to ensure the normal use.

2. Because the installation of carbon steel flange may have different outer diameter, the wrong port (not the heart), the thickness of the gasket is not equal, so the fixture should be processed with the side of the carbon steel flange is not interchangeable, so Measuring the size and number of ministries is the key to fixture processing and installation.

3. Measurement, the best arrangement of three people, of which two were measured, one proofing and fill in the form, measuring tools with calipers, if there is no condition available external calipers and steel ruler. Measurement is a meticulous work, is the premise of fixture installation , Measurement and recording must be prepared correctly, fill out the form must be carefully understood in the actual measurement work to cooperate with each other, in accordance with the correct principle of cooperation and use.