Škoda-Sentinel ' steam waggon The Sentinel boiler was a design of, fitted to the numerous built by the. The boiler was carefully designed for use in a steam wagon: it was compact, easy to handle whilst driving, and its maintenance features recognised the problems of poor quality and the need for it to be maintained by a small operator, rather than a major locomotive works. Although this design was used in most of Sentinel's products, they also produced larger boilers of quite different types for their. Section through a Sentinel boiler Sentinel boilers are vertical, as was common for many designs of, so as to reduce the effects of tilting due to hill climbing or uneven roads disturbing the.

It also provides a compact boiler that leaves adequate space in the cab for the crew, controls and coal bunker, whilst leaving as much as possible of the wagon's overall length available for the useful load. The boiler is a, with these tubes contained within a vertical, cylindrical outer drum. This drum is double-walled and forms a water jacket around the boiler, with a large vertical flue within. The inner flue has a complex cross section. It is stepped in three diameters, tapering towards the top. The central region is square in section, rather than round.

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This video explains the complete construction and working of a Babcox and Wilcox Boiler Boiler. The Video content is a copyright of Dragonfly Masterclass, an education company providing animated. A water-tube boiler is a type of boiler in which water circulates in tubes heated by fire from outside. The fire is produced by the fuel being burned inside the furnace for the boiler. Design types. Babcock and Wilcox boiler; A/D/M/O-type boiler; Flex-tube boiler; Forced-circulation boiler; Low water content.

The main heating surface is provided by in this squared section. These tubes are short, straight and pass between the flat faces of the squared section in a grid pattern. There are eight layers of tubes, four banks of six each way.

A space is left in the centre of the water-tube banks for the firing chute. The firebox is top-fired (and lit) through this chute and there is no side. The lower part of the water-jacketed barrel surrounds the firebox. The narrow waterspace here encourages rapid steam raising.

Firing is simple, with a thick fire relative to its area and fuel simply poured down. Beneath the grate is a water-filled ashpan, to prevent hot embers falling onto the road. Draught is controlled by a damper in the side of the ashpan, between the grate and the water tray. Above the tube nest the water space widens to form an increased reservoir, protecting against tilting. Sentinel's drawings permitted a hill climb gradient of 1 in 6. Modern regulations for buses require a safe tilt of 35°. The narrowed flue in this area is used, where fitted, to house the.

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An unusual feature of the Sentinel boiler was the 'exhaust drying box', a small, in the upper part of the boiler flue, immediately before the blastpipe nozzle. This heated the exhaust steam to avoid it condensing into a visible white plume. It was a requirement of the that engines should 'consume their own smoke'. Sentinel ' steam waggon of 1906, with boiler dismantled for cleaning By the nature of their use, steam wagons were often required to use that was either dirty or contaminated with dissolved minerals.

Untreated, this builds up on the tubes and particularly deposits in the lower parts of the boiler. Both of these disturb circulation and risk local overheating and damage, scale also reduces boiler efficiency and wastes fuel. The Sentinel boiler was designed to cope with these problems, and to permit easy of the waterspace. As well as the usual for daily use, the entire boiler could be dismantled easily. The outer shell was in two sections, inner and outer drum, and were joined by a bolted ring joint at top and bottom.