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ASME NB 4221.1

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thanjerm

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Jan 30, 2003
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The equation in NB-4221.1 regarding max difference in cross sectional diameters for vessels says that use the minimum of (D+50)/200[(D+1 250)/200] or D/100. Now this equation is confusing in the sense that (a)it looks like there's set of parenthesis missing, It looks like it should read [(D+50)/200][(D+ 1 250)/200]. and it looks like there should either be a comma, a multipy or a divide between the parenthis all of which don't make sense either. Does any body have know or have an experience of how to iteprete this equation.

Thanx
 
The original equation assumes that you know basic scietific nomeclature. I read it as:
(D+50)/200*[(D+1250)/200]. You could add another set of parentheses if it makes you feel better. They would go like this: (D+50)/(200*[(D+1250)/200]).

Patricia Lougheed

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thanks vpl for your response, in that case the 200 is not necessary in the denominator term (200*[(D+1250)/200]), 200 should cancel. the equation will end up reading (D+50)/(D+1250). this doesn't make sense either because the ratio (D+50)/(D+1250) is demensionless compared to D/100.
 
I can't argue with you on that.

Patricia Lougheed

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