Water-tube boilers built-up from sets of spaced double-walled water tubes of return type in unilateral abutting connection with a boiler drum or with a header box, i.e. built-up from Field water tubes comprising an inner tube arranged within an outer unilaterally-closed tube

Child Classifications

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• F22B 23/02 the water-tube, i.e. Field-tube, sets being horizontal or substantially horizontal
• F22B 23/04 the water-tube, i.e. Field-tube, sets being vertical or substantially vertical
• F22B 23/06 Component parts thereof, e.g. Field water tubes