Pipe Wall Thickness calculation

 Pipe Wall Thickness calculation

As per section 304.1.2 of ASME B31.3, for a straight pipe under internal pressure, the design thickness shall be calculated as per the following equation:

t = PD2(SEW+PY)$\frac{PD}{2(SEW+PY)}$

$\frac{<br>}{}$

The minimum thickness of pipe, T shall not be less than tm

where tm = t + c

c = sum of mechanical allowances (thread or groove depth) plus corrosion and erosion allowances

D = Outside diameter of pipe

P = Internal design pressure (gauge)

S = Allowable stress of material from Table A-1 of ASME B31.3

t = Pressure design thickness calculated as per above formula

W = Weld joint strength reduction factor in accordance with para 302.3.5(e)

E = Quality factor from Table A-1A or Table A-1B of ASME B31.3

Y = coefficient from Table 304.1.1, valid for t < D/6