What is the outside diameter of 3-1/2 inch pipe?

101.6 mm (4.000 in), in any schedule: it is the DN 90 pipe of ASME B36.10M. The wall changes with the schedule, and the inside diameter with it.

What is the wall thickness of 3-1/2 inch schedule 40 pipe?

5.74 mm (0.226 in), with an inside diameter of 90.12 mm (3.548 in); carbon steel pipe weighs 13.57 kg/m (9.12 lb/ft).

What is the difference between schedule 40 and 80 in 3-1/2 inch pipe?

The wall: 5.74 mm (0.226 in) in schedule 40 and 8.08 mm (0.318 in) in 80. The outside diameter is the same, so schedule 80 has the smaller bore -- 85.44 mm (3.364 in) against 90.12 mm (3.548 in) -- and weighs 18.64 kg/m (12.52 lb/ft) against 13.57 kg/m (9.12 lb/ft).

3-1/2 inch pipe (DN 90): outside diameter, wall thickness and weight by schedule

A 3-1/2 inch pipe (DN 90) has a 101.6 mm (4.000 in) outside diameter in every schedule: what changes is the wall, and with it the inside diameter and the weight. Designations that give the same wall share a row.

Schedule	Wall	ID	Weight
Sch 5 / 5S	2.11 mm (0.083 in)	97.38 mm (3.834 in)	5.18 kg/m (3.48 lb/ft)
Sch 10 / 10S	3.05 mm (0.120 in)	95.50 mm (3.760 in)	7.41 kg/m (4.98 lb/ft)
Sch 30	4.78 mm (0.188 in)	92.04 mm (3.624 in)	11.41 kg/m (7.66 lb/ft)
Sch 40 / STD / 40S	5.74 mm (0.226 in)	90.12 mm (3.548 in)	13.57 kg/m (9.12 lb/ft)
Sch 80 / XS / 80S	8.08 mm (0.318 in)	85.44 mm (3.364 in)	18.64 kg/m (12.52 lb/ft)

Plain-end weight of carbon steel pipe, by the standard's own formula: 10.69 × (D − t) × t in lb/ft, with D and t in inches (0.0246615 × (D − t) × t in kg/m, in mm). Austenitic stainless weighs about 2% more.

Lay out on 3-1/2 inch pipe

The outside diameter and the wall of the chosen schedule go to the calculator, which opens with them filled in and draws without an account.

Schedule Pipe saddle (90° tee) 90° lobster back bend

Questions

What is the outside diameter of 3-1/2 inch pipe?: 101.6 mm (4.000 in), in any schedule: it is the DN 90 pipe of ASME B36.10M. The wall changes with the schedule, and the inside diameter with it.
What is the wall thickness of 3-1/2 inch schedule 40 pipe?: 5.74 mm (0.226 in), with an inside diameter of 90.12 mm (3.548 in); carbon steel pipe weighs 13.57 kg/m (9.12 lb/ft).
What is the difference between schedule 40 and 80 in 3-1/2 inch pipe?: The wall: 5.74 mm (0.226 in) in schedule 40 and 8.08 mm (0.318 in) in 80. The outside diameter is the same, so schedule 80 has the smaller bore -- 85.44 mm (3.364 in) against 90.12 mm (3.548 in) -- and weighs 18.64 kg/m (12.52 lb/ft) against 13.57 kg/m (9.12 lb/ft).

3-1/2 inch pipe (DN 90): outside diameter, wall thickness and weight by schedule

Lay out on 3-1/2 inch pipe

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