A high-pressure steam locomotive is a steam locomotive with a boiler that operates at pressures well above what would be considered normal. In the later years of steam, boiler pressures were typically 200 to 250 psi (1.38 to 1.72 MPa).High-pressure locomotives can be considered to start at 350 psi (2.41 MPa), when special construction techniques become necessary, but some had boilers that operated …

The energy of combustion is transferred from the flame to the water by radiation and conduction, heating the water and ultimately raising steam. However, the means of heating the water to the point of ‘dry’ steam are markedly different. What are these boilers best suited to?

Click to view on 21:1220-05-2015· Government official film uploaded as “fair use.” Naval instructional film. Raising steam aboard Royal Navy destroyer. Detail for Admiralty three-drum boiler.

· PDF fileboilers now operate at the pressure of the incoming cold water mains, this is still far below the normal operating pressure of steam-raising boilers. This leaflet applies to steam and

A Steam boiler is a steel pressure container in which water under pressure is transformed into steam by the use of combustion. In other words, the boiler is just a heat exchanger which uses radiant heat and hot flue fumes, released from burning fuel, to produce vapor and hot water for heating and processing loads.

In the firetube boiler the hot gases pass through the tubes and the feedwater surrounds them. The procedure adopted for raising steam will vary from boiler to boiler and the manufacturers' instructions should always be followed. A number of aspects are common to all boilers and a general procedure might be as follows.

Where a simple vertical boiler requires additional heating surface, particularly where this is directly exposed to the furnace so as to raise steam more rapidly, field-tubes may be installed in the roof of the firebox, almost down to the level of the firebed. They thus act as a form of thermic syphon.

Fuel is burned inside the furnace, creating hot gas which heats water in the steam-generating tubes. In smaller boilers, additional generating tubes are separate in the furnace, while larger utility boilers rely on the water-filled tubes that make up the walls of the furnace to generate steam. The heated water then rises into the steam drum.