Depth of temperature gauge insertion
Thread Content
HG/T20507-2014 states that \"the length of the end of the temperature sensing element immersed in the inner wall of the pipeline should not be less than 50 mm, and should not exceed 125 mm.\" Why? How to explain it?
The smaller the temperature measurement area, the less accurate the readings. For pipes with a diameter of two inches, they either need to be inserted at an angle or after having their diameter adjusted; the insertion depth should not exceed 125 mm. I hadn’t paid attention to this before, but if the temperature probe is too long, it is prone to breaking due to erosion. The typical insertion depth for such probes is between 1/3 and 2/3 of the pipe’s diameter
It is highly recommended to modify the statement that the insertion depth is determined by the pipe diameter. As long as it meets the usage requirements adequately and accurately reflects the actual temperature, it is fine to use it for measurement on the outer wall of the tube.
The temperature insertion depth is generally at 1/3 to 2/3 of the pipe diameter; for pipes with a smaller diameter, the diameter needs to be enlarged.
This is the newly revised version; the previous one did not have this wording. This time, the premise of “full pipe” is specified, with “not suitable” being greater than 125. As long as I can get access to it, that’s fine!
The installation of the temperature probe is related to the pipe diameter; generally, the insertion depth is at 1/2 or 2/3 of the pipe diameter, as specified in the instructions for instrument installation.
Support! However, the outer wall requires a bonus to be displayed in the system, as well as experience; generally, no one is willing to do this unless it’s absolutely necessary. Basically, just insert it into the tube – it’s sufficient to have the measuring end exposed.
For higher temperatures, use a shorter insertion depth; for moderate temperatures, use a deeper insertion depth. In general, it should not go past the center of the pipe
If the thermometer is inserted too shallowly, it cannot provide accurate readings; if it is inserted too deeply, vibrations may occur, and in severe cases the thermometer can even break. Especially for media with high flow rates such as medium and high-pressure steam, it is not advisable to insert it too deep. Many thermometer manufacturers recalibrate for vibration; API has a formula for calculating vibration. If vibration occurs, measures such as reducing the insertion depth and thickening the casing are generally taken.