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  • F22B21/00
    		•  Water-tube boilers of vertical or steeply-inclined type i.e. the water-tube sets being arranged vertically or substantially vertically HB CC 3L032
  • F22B21/02
    		•  . built-up from substantially-straight water tubes HB CC 3L032
  • F22B21/04
    		•  ..involving a single upper drum and a single lower drum, e.g. the drums being arranged transversely HB CC 3L032
  • F22B21/06
    		•  ... the water tubes being arranged annularly in sets e.g. in abutting connection with drums of annular shape HB CC 3L032
  • F22B21/06@A
    		•  the annular arrangement consisting of multiple lines HB CC 3L032
  • F22B21/06@Z
    		•  Others HB CC 3L032
  • F22B21/08
    		•  ... the water tubes being arranged sectionally in groups or in banks e.g. bent over at their ends HB CC 3L032
  • F22B21/10
    		•  ...the water tubes being arranged in staggered rows HB CC 3L032
  • F22B21/12
    		•  .. involving two or more upper drums and two or more lower drums e.g. with crosswise-arranged water-tube sets in abutting connection with drums HB CC 3L032
  • F22B21/14
    		•  .. involving a single upper drum and two or more lower drums HB CC 3L032
  • F22B21/16
    		•  ... the lower drums being interconnected by further water tubes HB CC 3L032
  • F22B21/18
    		•  .. involving two or more upper drums and a single lower drum HB CC 3L032
  • F22B21/20
    		•  .. involving sectional or subdivided headers in separate arrangement for each water-tube set HB CC 3L032
  • F22B21/22
    		•  .built-up from water tubes of form other than straight or substantially straight HB CC 3L032
  • F22B21/24
    		•  ..bent in serpentine or sinuous form HB CC 3L032
  • F22B21/26
    		•  ..bent helically, i.e. coiled HB CC 3L032
  • F22B21/28
    		•  ..bent spirally HB CC 3L032
  • F22B21/30
    		•  ..bent in U-loop form HB CC 3L032
  • F22B21/32
    		•  ... disposed horizontally in abutting connection with upright headers or rising water mains HB CC 3L032
  • F22B21/34
    		•  . built-up from water tubes grouped in panel form surrounding the combustion chamber i.e. radiation boilers HB CC 3L032
  • F22B21/36
    		•  ..involving an upper drum or headers mounted at the top of the combustion chamber HB CC 3L032
  • F22B21/38
    		•  .. Component parts thereof e.g. prefabricated panels HB CC 3L032
  • F22B21/40
    		•  .built-up from water tubes arranged in a comparatively long vertical shaft, i.e. tower boilers HB CC 3L032
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