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

73.0 mm (2.875 in), in any schedule: it is the DN 65 pipe of ASME B36.10M. The wall changes with the schedule, and the inside diameter with it.

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

5.16 mm (0.203 in), with an inside diameter of 62.68 mm (2.469 in); carbon steel pipe weighs 8.63 kg/m (5.80 lb/ft).

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

The wall: 5.16 mm (0.203 in) in schedule 40 and 7.01 mm (0.276 in) in 80. The outside diameter is the same, so schedule 80 has the smaller bore -- 58.98 mm (2.323 in) against 62.68 mm (2.469 in) -- and weighs 11.41 kg/m (7.67 lb/ft) against 8.63 kg/m (5.80 lb/ft).

2-1/2 inch pipe (DN 65): outside diameter, wall thickness and weight by schedule

A 2-1/2 inch pipe (DN 65) has a 73.0 mm (2.875 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)	68.78 mm (2.709 in)	3.69 kg/m (2.48 lb/ft)
Sch 10 / 10S	3.05 mm (0.120 in)	66.90 mm (2.635 in)	5.26 kg/m (3.53 lb/ft)
Sch 30	4.78 mm (0.188 in)	63.44 mm (2.499 in)	8.04 kg/m (5.40 lb/ft)
Sch 40 / STD / 40S	5.16 mm (0.203 in)	62.68 mm (2.469 in)	8.63 kg/m (5.80 lb/ft)
Sch 80 / XS / 80S	7.01 mm (0.276 in)	58.98 mm (2.323 in)	11.41 kg/m (7.67 lb/ft)
Sch 160	9.53 mm (0.375 in)	53.94 mm (2.125 in)	14.92 kg/m (10.02 lb/ft)
XXS	14.02 mm (0.552 in)	44.96 mm (1.771 in)	20.39 kg/m (13.71 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 2-1/2 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 2-1/2 inch pipe?: 73.0 mm (2.875 in), in any schedule: it is the DN 65 pipe of ASME B36.10M. The wall changes with the schedule, and the inside diameter with it.
What is the wall thickness of 2-1/2 inch schedule 40 pipe?: 5.16 mm (0.203 in), with an inside diameter of 62.68 mm (2.469 in); carbon steel pipe weighs 8.63 kg/m (5.80 lb/ft).
What is the difference between schedule 40 and 80 in 2-1/2 inch pipe?: The wall: 5.16 mm (0.203 in) in schedule 40 and 7.01 mm (0.276 in) in 80. The outside diameter is the same, so schedule 80 has the smaller bore -- 58.98 mm (2.323 in) against 62.68 mm (2.469 in) -- and weighs 11.41 kg/m (7.67 lb/ft) against 8.63 kg/m (5.80 lb/ft).

2-1/2 inch pipe (DN 65): outside diameter, wall thickness and weight by schedule

Lay out on 2-1/2 inch pipe

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