How Do You Measure A Pipe Flange?

In piping systems, accurate measurement of pipe flange is essential to ensure compatibility and proper installation. Pipe flange size measurement includes measurements of outer diameter, gap, depth, and non-concentricity, which are important bases for pipe flange installation and maintenance. So how to measure? The following is a comprehensive guide to pipe flange measurement.

Preparation before measurement

Before measuring the pipe flange size, you must first make adequate preparations. According to the position of the pipe flange, draw a sketch of each connecting pipe flange of the equipment and number them consecutively so that the fixture can be installed accordingly.

At the same time, since the pipe flange may have different outer diameters, misaligned (non-concentric), and unequal gasket thickness, the processed fixture should correspond to the side pipe flange and cannot be interchangeable. Therefore, measuring the size and number of each part is the key to fixture processing and installation.

During the measurement process, it is best to arrange three people, two of whom measure and one proofread and fill in the form to ensure the accuracy of the measurement data.

Pipe flange size measurement steps

1. Outer diameter measurement

Use a vernier caliper or external caliper and a steel ruler to accurately measure the outer diameters D1 and D2 of the pipe flange. When measuring, ensure that the size is accurate to millimeters. If the measured data is 157.5mm, then this size is 157.5mm.

2. Inner diameter measurement

If possible, use a vernier caliper to measure the diameter of the inner hole of the pipe flange. This size needs to match the inner diameter of the connected pipe.

3. Gap measurement

Measure four points evenly distributed on the circumference of the pipe flange to obtain the accurate size of the pipe flange gap b. This step is crucial for evaluating the sealing performance of the pipe flange.

4. Depth measurement

Measure the depth C (the size between the outer edge of the pipe flange and the bolt) at the 1234 positions of the pipe flange, and select the smallest size as a record. This data helps determine the tightening force when installing the pipe flange.

5. Misalignment measurement

Select the size at the largest misalignment of the two pipe flanges as the measurement result of misalignment d. This data is of great significance for adjusting the installation position of the pipe flange and ensuring the sealing effect.

Precautions for measuring the installed pipe flange

1. Use flexible tools

For the installed pipe flange, use a tape measure to measure the circumference of the pipe flange, and then calculate the diameter through the formula.

2. Consider space limitations

When space is limited, use small tools (such as small vernier calipers) for measurement.

3. Handle insulated pipes

If the pipe has an insulation layer, it needs to be removed or the thickness of the insulation layer needs to be considered.

Summary

Through the above steps, we can fully and accurately grasp the various dimensional data of the pipe flange. These data not only provide strong support for the installation and maintenance of the pipe flange, but also help to ensure the safe and stable operation of industrial equipment. Therefore, it is necessary to deeply understand and master the pipe flange size measurement method. If you have any questions, you can always consult the flange supplier.