What is the outside diameter of 3/4 inch pipe?

26.7 mm (1.050 in), in any schedule: it is the DN 20 pipe of ASME B36.10M. The wall changes with the schedule, and the inside diameter with it.

What is the wall thickness of 3/4 inch schedule 40 pipe?

2.87 mm (0.113 in), with an inside diameter of 20.96 mm (0.824 in); carbon steel pipe weighs 1.69 kg/m (1.13 lb/ft).

What is the difference between schedule 40 and 80 in 3/4 inch pipe?

The wall: 2.87 mm (0.113 in) in schedule 40 and 3.91 mm (0.154 in) in 80. The outside diameter is the same, so schedule 80 has the smaller bore -- 18.88 mm (0.742 in) against 20.96 mm (0.824 in) -- and weighs 2.20 kg/m (1.48 lb/ft) against 1.69 kg/m (1.13 lb/ft).

3/4 inch pipe (DN 20): outside diameter, wall thickness and weight by schedule

A 3/4 inch pipe (DN 20) has a 26.7 mm (1.050 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	1.65 mm (0.065 in)	23.40 mm (0.920 in)	1.02 kg/m (0.68 lb/ft)
Sch 10 / 10S	2.11 mm (0.083 in)	22.48 mm (0.884 in)	1.28 kg/m (0.86 lb/ft)
Sch 30	2.41 mm (0.095 in)	21.88 mm (0.860 in)	1.44 kg/m (0.97 lb/ft)
Sch 40 / STD / 40S	2.87 mm (0.113 in)	20.96 mm (0.824 in)	1.69 kg/m (1.13 lb/ft)
Sch 80 / XS / 80S	3.91 mm (0.154 in)	18.88 mm (0.742 in)	2.20 kg/m (1.48 lb/ft)
Sch 160	5.56 mm (0.219 in)	15.58 mm (0.612 in)	2.90 kg/m (1.95 lb/ft)
XXS	7.82 mm (0.308 in)	11.06 mm (0.434 in)	3.64 kg/m (2.44 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 3/4 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 3/4 inch pipe?: 26.7 mm (1.050 in), in any schedule: it is the DN 20 pipe of ASME B36.10M. The wall changes with the schedule, and the inside diameter with it.
What is the wall thickness of 3/4 inch schedule 40 pipe?: 2.87 mm (0.113 in), with an inside diameter of 20.96 mm (0.824 in); carbon steel pipe weighs 1.69 kg/m (1.13 lb/ft).
What is the difference between schedule 40 and 80 in 3/4 inch pipe?: The wall: 2.87 mm (0.113 in) in schedule 40 and 3.91 mm (0.154 in) in 80. The outside diameter is the same, so schedule 80 has the smaller bore -- 18.88 mm (0.742 in) against 20.96 mm (0.824 in) -- and weighs 2.20 kg/m (1.48 lb/ft) against 1.69 kg/m (1.13 lb/ft).

3/4 inch pipe (DN 20): outside diameter, wall thickness and weight by schedule

Lay out on 3/4 inch pipe

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