EPERC TTF2 annual meeting – Milano November 2000 HSD « ADVANCED DESIGN METHODOLOGIES TO EXPLOIT HIGH STRENGTH STEELS FOR PRESSURE EQUIPMENT MANUFACTURE » DGIII Contract Nr following an EPERC TTF2 EOI (January 1999 – February 2001) co-ordinators: C. Boucher, A. Michel (IS) partners: IS, G.Baylac, EMD (ARMINES), A&AB(TUW) Appendix 4 (p. 1/7)

EPERC TTF2 annual meeting – Milano November 2000 Objectives To demonstrate the present design codes may be adapted to allow for benefitting of the improved properties of fine grained TMCP and QT steels To provide informations to DGIII aiming at preparing recommendations for further work in support of standardisation Appendix 4 (p. 2/7)

EPERC TTF2 annual meeting – Milano November 2000 Work programme Enquiry on the use of HSS for PV manufacturing - literature survey and dissemination of a questionnaire to help to identify the needs Design of prototypes (welded and non- welded PV) for the experimental validation of the design code deviation DBA and DBF, fitness for purpose assessment Experimental validation (fatigue tests and burst tests) Reporting and Recommendations Appendix 4 (p. 3/7)

EPERC TTF2 annual meeting – Milano November 2000 Enquiry results 46 answers over 90 (60 companies) Main difficulties faced by the manufacturerswere identified : –PWHT (new fabrication and repair) –HSS weld cracking –procurement (flanges and fitting) –etc. Appendix 4 (p. 4/7)

EPERC TTF2 annual meeting – Milano November 2000  Most relevant problems addressed: –PWHT: no PWHT after cold forming or for tempering and stress-relieving purpose –Procurement: use of standard normalised currently available flange and fitting  Prototypes for testing: –Sphere in TMCP steel – 460 MPa YS - 35 mm thick (as cold worked, no stress relieving) –Cylindrical shell in QT steel – 500 MPa YS - 25 mm thick (as cold worked, no temper) –Un-welded forged buffer vessel and screwed - in flat ends hydraulic accumulator in 34CrMo4 QT steel Appendix 4 (p. 5/7)

EPERC TTF2 annual meeting – Milano November 2000 Welded PV testing A detailed testing protocol has been defined (the ECOPRESS project co-ordinator participated to the protocol definition) : NDT quasi-burst test NDT put artificial defects (spark-machining) in the most critical areas according to DBA fatigue testing (  0 – P d ), 500 cycles minimum life NDT Appendix 4 (p. 6/7)

EPERC TTF2 annual meeting – Milano November 2000 Future work Pressure test completion Final report – recommendations to DGIII (by February 2001) Co-ordination vs. ECOPRESS Dissemination (EPERC, CEN, AFIAP conf. 2001…) Appendix 4 (p. 7/7)