IPC Main Group
F22B 23/00 Water-tube boilers built-up from sets of spaced double-walled water tubes of return type in unilateral abutting connection with a boiler drum or with a header box, i.e. built-up from Field water tubes comprising an inner tube arranged within an outer unilaterally-closed tube
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- Class:
- STEAM GENERATION
- Subclass:
- METHODS OF STEAM GENERATION; STEAM BOILERS
3 direct subcodes
Child Classifications
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- F22B 23/02 the water-tube, i.e. Field-tube, sets being horizontal or substantially horizontal
- F22B 23/04 the water-tube, i.e. Field-tube, sets being vertical or substantially vertical
- F22B 23/06 Component parts thereof, e.g. Field water tubes