Materials Q&A
Have PMI testing limitations changed with the advances in technology?
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- Published on Friday, 12 April 2013 09:47
- Written by Don Bush
A: 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).
Titanium Valve Grades
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- Published on Monday, 31 December 2012 11:43
- Written by Thomas Spence
Q: Why are cast titanium valves commonly offered in grades different than my wrought pipe?
Nickel-Copper Alloys
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- Published on Tuesday, 02 October 2012 08:32
- Written by Don Bush
Q: Are the nickel-copper alloys (such as UNS N04400) acceptable for use in accordance with the NACE sour service standards?
NACE MR0103 Material Compliance
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- Published on Monday, 12 March 2012 09:09
- Written by Don Bush
Q: I have a material certified to be compliant with NACE MR0175. Is that material also compliant with NACE MR0103?
Which Valve for Nitric Acid Service?
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- Published on Monday, 19 September 2011 18:47
- Written by Thomas Spence
Q: I requested CF8 valves but the supplier is offering CF8M valves at less cost. However, I am not sure this alternative is a good choice for my nitric acid service. Are my concerns warranted?
Addressing Welding Procedures Not Covered by ASME Section IX
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- Published on Monday, 19 September 2011 18:47
- Written by Don Bush
Q: My customer has rejected my welding procedure specification (WPS) and has asked me to address items that are not required by ASME Section IX. Is this reasonable?
HIC Testing
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- Published on Tuesday, 18 January 2011 13:22
- Written by Don Bush
Q: I’m working on an order in which the customer’s material specification imposes HIC testing. What is HIC testing?
Cobalt-base Alloy 6
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- Published on Thursday, 14 October 2010 05:43
- Written by Don Bush
Q: Is there a problem using cobalt-base Alloy 6 material in amine applications in refineries and gas treatment plants?
Cast or Forged?
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- Published on Thursday, 15 July 2010 10:29
- Written by Thomas Spence
Q: Should I be concerned whether my valve is cast or forged?
ASTM A182
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- Published on Wednesday, 21 April 2010 01:00
- Written by Don Bush
Q: In the last Materials Q&A column, you discussed using forged bar to make hubbed-flange components such as bonnets. I noticed that ASTM A182 specifically states that forged bar cannot be used for flanges. Was your original statement in error?
