Some years ago, SPI, the Society of Plastics Industry,Inc, New York had issued a technical bulletin (cost a few dollars). Does anyone know if the Bulletin U118-R still valid, or if it has been renamed or withdrawn?
Under NACE MR0175-03, a table listing acceptable ASME and API pipes for sour service, HIC testing is a requirement. I wonder how many suppliers and users know this?
MR0175 Part 2, Paragraph 7.2.1.2 Figure 1 Regions, and also Para 7.2.1.4
Please help me make some sense of the conflicting information. According to the latter para, A.2 materials can be used in all of the regions. When looking at the Table A2 (page 21), it lists carbon steel pipes in API and...
This is particularly a useful answer as it is comprehensive and is based on actual experience. Reading all the opinions on this topic,I can summarise that for acid gas injection lines, if there is no water present or likelihood of condensation, A 333 Gr 6 pipe can be used. When there is...
The gas analysis shows a small percentage of water. 316 has been chosen over 304, because of the susceptibility of 304 to stress corrosion cracking in wet hydrogen sulfide service. Please refer to Page 36 of the book Materials Engineering 1, by McGraw Hill, edited by Kenneth McNaughton and the...
Helo Strider 6,
Thanks for your input. But please refer to Table A2 of NACE MR0175/ISO 15156-3:2003 Technical Corrigendum 2, dated 2005-09-01. This corrigendum has removed the pp H2S restiction on the use of Austenitic SS for sour service.
Thanks
We are designing a buried 3" gas line some 200 m long to carry 70% H2S, 29% CO2, 0.0059% H2O, and the balance of C1 and C2, all in mol fractions. Design pressure is 1800 psig,(ANSI 900# RTJ flanges chosen) and design temp is 54C. Looking at NACE requirements and the fact that corrosion...
