(under subclass 235) Water tube boilers comprising a vertical stand pipe, around which extends coils or loops of tubes in either direct or indirect communication with the stand pipe.
SEE OR SEARCH THIS CLASS, SUBCLASS:
132, for vertical fire tube boilers provided with radial loops.
133, for vertical fire tube boilers provided with radial spurs.
169+, for similar structure located within a vertical flue.
185, for vertical stand pipes provided with radial loops located in a vertical flue. 186, for stand pipes provided with radial spur tubes located within a vertical flue.
245, and 246, for analogous art.
281, for stand pipes provided with loops over a firebox.
307+, for central standpipes provided with spur tubes.
323, for miscellaneous water tube boilers with central stand pipes.
