Difference between NACE MR0175 & MR0103
Trupply carries Pipes, Valves, & Fittings that conforms to NACE specification MR0103 & MR0175 for Sulfide Stress Cracking (SSC) resistance. It is often a question asked by customers about NACE conformance. Below is the abstract and paper presented at a NACE conference that highlights the difference nicely.
NACE MR0103 "Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refining Environments" was developed by Task Group 231 to provide a standard set of requirements for materials used in sour petroleum refinery equipment. In the past, NACE MR0175 , "Sulfide Stress Cracking Resistant Metallic Materials for Oilfield Equipment", was frequently referenced for this equipment, even though refinery applications were outside the scope of MR0175. The process used to develop MR0103 is described, followed by a review of the requirements in the standard accompanied by highlights of the differences between MR0103 and the previous and current versions of MR0175.
From a practical standpoint it is expected that for downstream applications a broad range of users and authors of equipment standards will adopt the new MR0103 standard, in many cases replacing the current application of MR0175. It is expected that use of the environmental guidelines and material requirements of MR0103, together with NACE RP0472 for weld hardness control of P-No. 1 carbon steels, will be broadly applied to piping, valves, process contacted bolting, pumps, and compressors used in the sour service areas of the refinery process units listed in Table 3 in order to prevent SSC.
- Chance Gristy