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Pipe Wall Thickness Calculator

Per ASME B31.3 Process Piping Code

Design Pressure (kPa)

Design Temp. (°C)

Outside Dia. OD (mm)

Material / Allowable Stress

E — Joint Efficiency

CA — Corrosion Allowance (mm)

Y — Y Coefficient

Pipe Schedule (optional)

t_min = P × D / (2 × (S × E + P × Y))

P=1000 kPa, D=88.9 mm, S=138 MPa, E=1.0, Y=0.4

NPS	OD (mm)	Schedule	Wall (mm)	ID (mm)
1/2"	21.3	40S	2.77	15.8
1/2"	21.3	80S	3.73	13.8
1/2"	21.3	160	5.54	10.2
3/4"	26.7	40S	2.87	21
3/4"	26.7	80S	3.91	18.9
3/4"	26.7	160	6.35	14
1"	33.4	40S	3.38	26.6
1"	33.4	80S	4.55	24.3
1"	33.4	160	8.03	17.3
1-1/2"	48.3	40S	3.68	40.9
1-1/2"	48.3	80S	5.08	38.1
1-1/2"	48.3	160	10.03	28.2
2"	60.3	40S	3.91	52.5
2"	60.3	80S	5.54	49.2
2"	60.3	160	11.03	38.2
3"	88.9	40S	5.49	77.9
3"	88.9	80S	7.62	73.7
3"	88.9	160	11.68	65.5
4"	114.3	40S	6.02	102.3
4"	114.3	80S	8.56	97.2
4"	114.3	160	13.51	87.3
6"	168.3	40S	7.11	154.1
6"	168.3	80S	10.97	146.4
6"	168.3	160	18.77	130.8
8"	219.1	40	8.18	202.7
8"	219.1	80	12.7	193.7
8"	219.1	120	16.66	185.8
10"	273.1	40	9.27	254.6
10"	273.1	80	12.7	247.7
10"	273.1	120	19.05	235
12"	323.9	40	10.31	303.3
12"	323.9	80	14.27	295.4
12"	323.9	120	22.23	279.4