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Last updateMon, 03 Aug 2015 4pm

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Materials Q&A

Conflicting requirements in Section II and VIII materials specifications

materials q and a graphicQ: In two Materials Q&A columns back in Winter 2010 and Spring 2010, you discussed making flanges from forged bar, and in the Spring column you indicated that it would be interesting to submit an inquiry to ASME regarding the conflicting requirements in the Section II material specifications vs. Section VIII Appendix 2. Was that ever done?

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Do I need to be concerned about galvanic corrosion when selecting valve materials?

materials q and a 300x300A: This is a good question, and the answer should begin with discussing exactly what is meant by galvanic corrosion.

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Have PMI testing limitations changed with the advances in technology?

materials q and a 300x300A: The short answer is that the situation has changed in some ways, but that PMI still has limitations. The long answer is a bit more complicated. First, let’s clarify what is meant by the term PMI (which stands for positive material identification).

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Titanium Valve Grades

materials q and a 300x300Q: Why are cast titanium valves commonly offered in grades different than my wrought pipe?

 

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Nickel-Copper Alloys

materials_q_and_a_graphicQ: Are the nickel-copper alloys (such as UNS N04400) acceptable for use in accordance with the NACE sour service standards?

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Valve Magazine Digital Edition

Valve Magazine Summer 2015Inside the Summer 2015 issue…

• Critical Service
• Effects of Flashing/Cavitation
• Coatings and Wastewater Apps
• The Latest in R&D

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