Category: Properties Of Steam And Steam Generators

This type of safety valve is spring loaded. Spring force works against the steam pressure, when steam pressure becomes high, valve is lifted off the valve seat and steam is escaped out. A lever is attached with one end of spring as shown in Figure 4.15. When steam pressure comes down valve returns to valve seat due…

Figure 4.14 Dead Weight Safety Valve Steam pressure acting in upward direction is counter balanced by the dead weight of safety valve acting in downward direction. When steam pressure exceeds the dead weight of safety valve, valve rises from its valve seat and steam escapes into the atmosphere. The construction of dead weight safety valve is…

Safety valve is used to release the excess pressure inside the boiler drum. When pressure inside the drum exceeds the working pressure, safety valves blow-off the steam into the atmosphere. Generally, four types of safety valves are used in boilers:

Boiler mountings are the components of boilers which are mounted over the body of the boiler for safety and controlling the steam generation processes. Following are the components which are used as mountings in boiler operation:

Cornish boiler is similar to Lancashire boiler but the number of tubes is only one. Also, the dimension of drum is smaller than that of Lancashire boiler. The rest are of similar construction and operation.

A Lancashire boiler is horizontal, fire tube, internal fired, natural circulation type boiler. There are two fire tubes. The fuel is burnt on the grate and hot flue gas is produced. The flue gas moves along the furnace tubes and is deflected up by fire bridge. As soon as the flue gas reaches the back…

Locomotive boiler is a fire tube, horizontal, multitubular, natural circulation, movable, artificial draught, internal fired boiler. It meets the fluctuating demand of steam; its chimney height is very short. Artificial draught is created by supplying steam. It is generally used in steam engine. The functions of all the mountings and accessories are discussed in a…

Babcock and Wilcox boiler is a water tube, horizontal, multitubular, external fired boiler. It covers wide range of pressures compared to fire tube boilers. It has steam generating capacity from 20,000 to 40,000 kg/h. It operates at an average 20–22 bar but it can be operated at maximum 40–42 bar. Its tubes are inclined at…

It is fire tube, multitubular, internal fired, and vertical boiler. Its maximum steam generation capacity is 3,500 kg/h. Its shell diameter and height are 2.75 m and 5.8 m, respectively. The fuel (coal) is fired on the grate in the furnace. The hot flue gas passes through the fire tube located in the water space…

A good boiler should have the following properties: