Thermal Expansion of Steam Pipes - (inches)

Expansion of steam pipes heated from room temperature to operation temperature.

Expansion of steam pipes when pressurized and heated from room temperature.

Steam Pipes - Thermal Expansion - SI units

Thermal Expansion of Steam Pipes
Operating Temperature (^oF)	Expansion (inches per 100 ft Pipe)
150	0.75
200	1.15
250	1.6
300	2.0
350	2.4
400	2.9
450	3.3
500	3.8

Note! - to avoid unacceptable stress and damage in a steam pipe line - handle expansion properly.

Example - Expansion of Steam Pipe

Steam pipe - temperature expansion

make 3D models with The Engineering ToolBox Sketchup Extension

A system is designed for pressure 120 psi with operating temperature 350 ^oF. As indicated in the table above (350 ^oF) the expansion is is approximately 2.4 in_100ft pipe.

The expansion of a 90 ft long pipe can be calculated as

dl = ((2.4 in_100ft) / (100 ft)) (90 ft)

= 2.2 in

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