Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically

Introduced: September 1968

Of 7 combined children, 4 exist in both systems.

3 codes are CPC-only extensions.

Child Classifications

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F22B 21/002 CPC only CPC only
F22B 21/005 CPC only CPC only
F22B 21/007 CPC only CPC only
F22B 21/02 built-up from substantially-straight water tubes IPC+CPC Available in IPC and CPC
F22B 21/22 built-up from water tubes of form other than straight or substantially straight IPC+CPC Available in IPC and CPC
F22B 21/34 built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers +3 CPC IPC+CPC Available in IPC and CPC
F22B 21/40 built-up from water tubes arranged in a comparatively long vertical shaft, i.e. tower boilers IPC+CPC Available in IPC and CPC