Measurement of inner tube size of heat exchanger

The ASTM A179 standard requires that tubular heat exchangers, condensers and similar heat transfer equipment use minimum wall thickness, seamless cold-drawn mild steel tubes. How to measure of the size for the heat exchanger tube ?

Measuring method

The size of the inner tube of the heat exchanger refers to the diameter of the inner tube, which is generally measured by the outer diameter. The method is as follows:

1. Prepare measuring tools such as the inside diameter caliper and the outside diameter micrometer.

2. Lay the inside diameter caliper flat, stand the outside diameter micrometer on the caliper, keep the micrometer level, adjust the distance between the caliper and the micrometer, insert the micrometer probe between the two legs of the inside diameter caliper, and gently press the two legs of the caliper to clamp the micrometer probe.

3. Read the measured value and keep one to two decimal places.

Judgment standard

After the measurement is completed, the size obtained needs to be judged. There are mainly the following standards:

1. Whether it is consistent with the size provided by the manufacturer.

2. Whether it meets the selected pipeline standard.

3. Whether it meets the inner diameter size required by the heat exchanger design.

4. Whether it meets the flow requirements required for use.

5. Whether there is no loss, no rust and other problems.

Precautions

In the process of measuring and judging the size of the inner tube of the heat exchanger, the following points should be noted:

1. Pay attention to the accuracy of the measurement position when measuring to avoid dimensional errors caused by position offset.

2. When judging the standard, ensure that the basis is consistent with the information provided by the manufacturer, and consider the actual application situation.

3. The size of the inner tube of the heat exchanger is an important parameter, which should be frequently tested and adjusted during use.

Summary

The above is the method and standard for measuring the size of the inner tube of the heat exchanger. I hope it will be helpful to everyone. When measuring and judging, you need to pay attention to accuracy and actual application to ensure the performance and safe operation of the heat exchanger.