The Cochran is a package unit covering a range of evaporations. The Cochran boiler is a three pass wet back design. The first pass is the furnace and the second and third passes are two nests of small bore smoke tubes. All plain tubes are expanded except for boilers with working pressure of 13.79 bar= 200 lb/inch2 and over when the second pass tubes are expande3d and seal welded into the reversal chamber. All the required number of stay tubes and stay bars are fitted in all boilers. All stay tubes are welded into the tube plates and reversal chamber. Stay bars are welded into the tube plates. The flue gas outlet is normally positioned vertically on the rear casing. The Cochran boiler internal access is through an elliptical manhole with a removable door which is provided on top of the boiler. A muddoor is fitted to each tube plate. Access to the rear chamber is achieved by removing the side doors of the rear casing. Whilst access to the front chamber is provided by ope
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