Subject Area

Systems Engineering / Pressure Equipment

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PED Professional 6

Stress/strain reduction

   

Reduzierung von Spannung/Dehnung durch Konstruktionsänderung bzw. Änderung der Betriebsweise

 

Description:
After 3 years of operation, cracks penetrating through approx. 25 % of the wall thickness were detected on the internal surface of a feedwater tank.  

Failure cause:
Betriebsbegleitende Dehnungs- und Temperaturmessungen zeigten, dass im Rissbereich Spannungskonzentrationen vorlagen und gleichzeitig Betriebszustände auftraten, welche Belastungen ergaben, die in der Auslegung des Bauteiles nicht berücksichtigt waren.

Remedy:
Thanks to a more favorable design, stress was reduced by approx. 50 %. Modifying the mode of operation helped to reduce component stress still further.

Our services – your benefits:
Interpretation of the results obtained from in-service strain and temperature measurements prevented renewed cracking. Component and power plant availability were no longer impaired by such cracks.

Consulting services from:
TÜV SÜD Industrie Service GmbH