I have few questions,as under,on NACE requirement and I seek
clarification of same on my understanding.Please share your experience
on interpretation of NACE standard.
1)Steel used by us(SA106GRB,SA105,SA234GRWPB), for Natural Gas,Crude
Oil and Condensate service application(with partial pressure of wetH2S
in the system much less than 0.05 psia),is not of very high UTS and
hardness is less than 22HRC.Is such steel susceptible to SSC and HIC
and needs compliance to MR0175/ISO15156 with eloberate testing??
2)If my above referred steel meets the requirement of A.2(Nace MR0175/
ISO15156-2)(with partial pressure of wetH2S in the system much less
than 0.05 psia),does it comply to NACE MR0175/ISO15156 SSC resistant
without any testing as per Annexure B??
3)If my above referred steel complies to requirement of % Sulphur as
per CL8.0 of Nace MR0175/ISO15156-2(with partial pressure of wetH2S in
the system much less than 0.05 psia),can it be considered complying to
NACE MR0175/ISO15156 HIC resistant without any testing as per Annexure
B??
4)If my system falls in SSC Zone 0(Fig 1,Cl 7.2.1.2 Page 9 of the
standard) with respect to H2S partial pressure vs Ph,does it still
call for NACE HIC compliance to the standard??
If my system falls in SSC Zone 1(Fig 1,Cl 7.2.1.2 Page 9 of the
standard) with respect to H2S partial pressure vs Ph,can we
straightaway go for material listed in A.2 without any testing as per
Annexre B??
5) Can Casting body be straightaway considered as non-susceptible to
HIC??
Regards
Aarpee
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