measurement  

Undamaged, even and cleaned sealing surfaces are the basic prerequisite for a permanently tight flange connection. An on-site inspection at the plant can provide clues as to the cause based on the leakage pattern. 

Furthermore, the subsequent measurement of the flange sealing surfaces on site enables a statement to be made about possible causes of leakage. In the case of small sealing surfaces or grooves, the measurement can be carried out using mechanical aids; in the case of large sealing surfaces, laser-optical measurement makes sense. 

The laser-optical measurement can be realised with about 20 measuring points per sealing surface including computer evaluation with a time expenditure of about 1-2 hours.

  evaluation  

The evaluation of the sealing surface measurement can either be used to verify the suitability of the sealing surface or to determine the required amount of processing.

The following information is obtained from a measurement:

• Distance of the measuring points from an averaged plane
• Impermissible deviations
• For grooves: Groove depth and transitions
• For webs: web height and transitions

This allows clear statements to be made about the condition of each sealing surface. The maximum diameter of the measuring range is approx. 20 m, the accuracy is 0.001 mm if the data transducer is positioned exactly.