Fig. 7.—Completed Locomotive Boiler.
in by means of a pump, or by connecting the boiler by a flexible pipe to the hydraulic installation of the shop, suitable pressure valves being inserted in the main to avoid any excess of pressure which would strain the boiler. All leaks and defects have to be made good before the second or steam test is applied.
The steam test pressure is limited to 10 lb. per sq. in. in excess of the working pressure of the boiler, and if this test is passed the boiler is painted with a good coat of anti-corrosive paint to preserve the plates, and is then ready for sending over to the erecting shop to be placed on the engine. Fig. 7 shows a locomotive boiler in its finished condition.[1]
1 ↑ Fig. 7 is reproduced from the author’s book The Development of British Locomotive Design, by kind permission of The Locomotive Publishing Co., Ltd. The opening in the front of the firebox casing is special to this particular boiler, and does not exist in ordinary boilers of standard construction.
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