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 opening a hinged door. All smoke tubes are then exposed
for cleaning. Access to the furnace is provided by a bolted, refractory line
rear door.
The Cochran boiler designed by following British
Standard Specification 2790 and AOTC rules. It is X rayed as required for class
I fusion welded pressure vessel. The shell is insulated with high quality
insulation and in turn is completely encased with sheeting to provide a clean
and easily maintained finish.
The Cochran boiler also suitable for gas firing, oil
and can be fitted with oil gas or dual fuel burners.
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