How to install a thermowell on a knee?
Installing a thermowell on the elbow: The most important reason why people prefer to install a thermowell on the elbow is that it saves the Wake (WFC) frequency calculation, so it is important to install the thermowell effectively to achieve the intended purpose. Reach yourself.
There are 4 main parameters to consider
1- The direction of flow in a pipe (the point must face the direction of flow)
2- Acceptance from other fields, especially the process part
3- Empty space to remove the temperature sensor
4- Ease of access in case of testing
Why do you check the flow path?
Vortices are formed when the body is perpendicular to the flow. Now when we install the thermocouple at the elbow, our goal is to achieve a low “current perpendicular” thermocouple contact. The case has a tip downstream of the elbow
It is clearly observed that the vertical surface is more exposed to current. Now compare it with the upward tip of the knee.
We see that when the tip is upwards, the “vertical” area is too low for flow, so von Carmen’s very low vortices and therefore less stress on the thermowell. The thermowell is mounted on the knee and the tip is upward As shown, they usually prefer to assemble with the tip pointing downwards ……
ASME PTC Reference 19.3 TW-2016 Page No. 28
Note: The world’s largest petrochemical companies based on their design stated that WFC must comply with ASME PTC 19.3
Approval from other disciplines
In the figure below, we assume that our thermowell is located here
We may now feel that we can ride it on our knees, but we are waiting for the distance between the other line that joins us. So this process may want to measure the temperature of the liquid before mixing, and so even if other considerations are met, we still can not go to the knee installation.
Clearance space for Thermowell
This is easy to understand if you want to remove or install the thermowell. To physically remove the temperature assembly must be a clearance space. Should be about 610 mm (24 inches)
In case of Test well Ease of Accessibility
It is recommended that test tubes should be easily accessible and therefore should be discussed if a knee is at a high altitude and a friendly solution is required. In some cases, I have found that clients do not accept knee installations because they want the test to be easily accessible.
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