This tank’s original shell thickness is less than 0.500 inch; therefore brittle fracture is not a concern per Sec. 5.3.7
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I was very glad to see this thread because I have been debating this very issue with a colleaugue. I also believe that the correct answer here would be inches, but I'm not sure this site will provide enough documentation for her to accept my answer. Can you cite a rule or reference that I can look up to "prove" this to her? Thanks in advance.
I don't know of an authority for "inches", but will continue to look. (There may also be a difference in US/UK usage.)
Danyoo's reply reminds me of another format:
I'm afraid the (London) Times Style Guide reproaches me for my earlier "ins", by the way:
LATER: Google gives a drastically different picture, however. On '0.050', its 23,000 on 'inch', and a handful (755) on 'inches'.
Another interesting point to note is the International System of Units uses this convention where prefixes meaning greater than 1 are written with a capital letter (60 Mbit memory) whereas prefixes meaning less than 1 are written with a small letter (89 nm). With the exception that kilo (1000), hecto (100) and deca (10) can use either.
I'm rapidly coming to the conclusion that my own usage wouldn't bear close scrutiny.
People are waiting to help.
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