CPC Main Group
F22B 21/00 Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
7 direct subcodes
Child Classifications
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- F22B 21/02 built-up from substantially-straight water tubes
- F22B 21/22 built-up from water tubes of form other than straight or substantially straight
- F22B 21/34 built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
- F22B 21/40 built-up from water tubes arranged in a comparatively long vertical shaft, i.e. tower boilers