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Piping system

Piping system is an essential part of a steam power plant. It is employed to transmit water, steam, air, oil and vapour from one position to others.

Types of piping system:
A power uses many fluids like water, air, oil, steam, gas etc during its operation. This requires a variety of integrated piping system mentioned below:

1.      Water piping: Raw water, feed water, condensate and condenser cooling water.
2.      Steam piping: Main, reheat, bleed exhaust steam.
3.      Blow of piping: Boiler, evaporator, feed treatment.
4.      Miscellaneous piping: Water treatment, service water, lubricating oil, drains compressed air etc.


                                                Figure:  Steam piping system
Materials for pipes

 Ø  Cast iron: Cast iron pipes are used underground for water and drainage system and in order to place where problem of corrosion is excessive. Cast iron pipes are used for water service up to a pressure of 15 kg/cm2. 

Ø  Wrought iron: Wrought iron pipes are used for condensate, feed water and blow of lines. Such pipes are used for low and medium pressure range and should not be used when pressure is more than 250 psi. 

Ø  Wrought steel: Most of the pipes used in power station are made of wrought steel. It is cheaper than others. 

Ø  Alloys steel: For high temperature flow pipes are made of alloys steel. Chromium steel pipes are used for the temperature higher than 5250C. For temperature between 4000C-5250C carbons molybdenum steel may be used. 

Ø  Copper and brass: Pipes made up of copper and brass are costly and are mostly used for oil lines. Brass pipe are used up to pressure 20 kg/cm2.


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Boiler: A steam boiler is usually a closed vessel made of steel. Its function is to transfer the heat produced by the combustion of fuel to water and ultimately to generate steam.
Types of boiler:
           1. Fire tube or smoke tube boiler            2. Water tube boiler

                                          Figure: Boiler
Fire tube boiler: In fire tube steam boilers, the flames and hot gases, produced by the combustion of fuel pass through the tubes which are surrounded by water. Fire tube boilers are generally used for relatively small steam capacities and low to medium steam pressure. As a guideline fire tube boilers are completive for steam rates up to 12000kg/h and pressures up to 18 kg/cm².Fire tube boilers are available for operation with oil, gas or solid fuel.

                                   Figure: Vrious parts of boiler
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