... boilers.FIRE-TUBE BOILER ANALYSIS AND SELECTIONDetermine the heating surface in an 84-in (213.4-cm) diameter fire-tube boiler 18ft (5.5 m) long having 84 tubes of 4-in (10.2-cm) ID if 25 percent of the ... installation, a standard, field-assembled, welded-steel-cased,bent-tube, single-steam-drum boiler with a completely water-cooled furnace wouldbe suitable. This type of boiler is usually fitted with ... integralparts of each other. For this reason the boiler is well suited for pulverized-coalfiring in the 50,00 0- to 300,000-lb/ h (6. 3- to 37.8-kg/ s) capacity range. Thus, if a250,000-lb/ h (31.5-kg /s)...