It looks that MR 0103 ( NACE new Standard for Material Resistance to SSC in Non-OilField Refinery and Petrochemicals) has waived the maximum material use hardness of 22HRC and left this performance parameter on the minimum tensile strength of the material. But in MR 0175 maximum use hardness of 22 HRC is defined. An opinion cum discussion and value additions invited. Please. regards DM Debasis.Mitra@hpl.co.in

Debasis Thank you for updating on the new NACE MR 0103 standard. In his reply, Scott has rightly referred to NACE RP 0472 from hardness requirement. NACE RP 0472 is usually followed for hardness requirement from SSC even for P1 material. Hardness level of 22 HRC has also been revised as per this to around 200 BHN (around 18 HRC) for P 1 material. If this is followed the T.S (Min.) should be lower than 90,000 -100,000 PSI (<70 KSC) for any material, incluidng P1, to meet SSC resistance. Trust this is of help to you C.V.Srinivasan Nishi Engineers Pvt Ltd India Dec 23, 2005 E-mail: nishi@vsnl.com >>It looks that MR 0103 ( NACE new Standard for Material >>Resistance to SSC in Non-OilField Refinery and >>Petrochemicals) has waived the maximum material use hardness >>of 22HRC and left this performance parameter on the minimum >>tensile strength of the material. But in MR 0175 maximum >>use hardness of 22 HRC is defined. >>An opinion cum discussion and value additions invited. >>Please. >>regards >>DM >>Debasis.Mitra@hpl.co.in > >First of all, thanks for informing the forum of this new >standard. From what I can see there is a table (table 2) >indicates maximum hardness per "P" number with the exception >of P1 material. MR 103 references NACE RP 0472 for hardness >requirements. > >Scott123