ASME B31.3 - Pipe Wall Thickness Calculation Sheet



		ASME B31.3 - Pipe Wall Thickness Calculation Sheet
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Pipe wall thickness calculation as per ASME B31.3-2016, Sect. 304.1.2:
I. Calculate pressure design thickness:
		t =	P · D		, where
			2 · (S·E·W + P·Y)
P :	0.303	[MPa]	(Internal design gage pressure)
D :	168.3	[mm]	(Outside diameter of pipe)
S :	113.2	[MPa]	(Material stress value - Table A-1)
E :	0.8	[-]	(Quality factor - Table A-1A or A-1B)
W :	0.85	[-]	(Weld joint strength reduction factor - par. 302.3.5(e))
Y :	0.4	[-]	(Coefficient - Table 304.1.1)
t =	0.33	[mm]	(Pressure design thickness)
II. Calculate minimum required thickness:
		tm =	t + c	, where
c1 :	0	[mm]	(Mechanical allowance: thread or groove depth)
c2 :	0.3	[mm]	(Corrosion allowance)
c3 :	0	[mm]	(Erosion allowance)
c =	0.30	[mm]	(Sum of c1, c2 and c3)
tm =	0.63	[mm]	(Minimum required thickness, considering allowances)
III. Calculate minimum specified thickness:
tol:	12.5	%	(Mill under tolerance)
Tmin =	0.71	[mm]	(Minimum required pipe thickness when ordering)
								Note: This calculation is only suitable for seamless pipe with t < D / 6.