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Coal Fired Threaded Pipe Boiler - Coal Fired Threaded …2014-12-29 · Coal fired threaded pipe hot water boiler 1.The boiler shall employ single return screwed pipe ,arched tube plate,and aerofoil flue,which shall make quasi-steel resistance of the shell to change into quasi-steel,avoiding tube plate crack due to high temp. 2.The rational design of cycleView More