1. R6 Revision 4, Assessment of the Integrity of Structures Containing Defects, BEGL Procedure, 2001.
2. EN 12952-4, 2000. Water tube boilers and auxiliary installations – Part 4: In-service boiler life expectancy calculations. CEN, Brussels, 18 p.
3. PD 6539, 1999. Guide to methods for the assessment of the influence of crack growth on the significance of defects in components operat-ing at high temperatures. BSI, London.
4. ISO/DATA 1-1978E, 1Cr 0.5Mo steel. ISO 1978.