A METHOD OF CONSTRUCTION OF PACKAGED FIRE TUBE TWO- AND THREE-PASS, WET- BACK, SEMI-WET-BACK AND DRY-BACK STEAM BOILERS AS WELL AS PRESSURIZED AND NON-PRESSURIZED HOT WATER GENERATORS AND HOT AIR GENERATORS

摘要

A method of construction of efficient small capacity fire tube steam boilers, hot water and hot air generators comprising a furnace tube extending from the main boiler front end plate and encased by a smaller shell forming a water leg surrounding the furnace extension and creating heat transfer area.