Table of Contents
Why is the crown of a Cochran boiler is of hemispherical shape?
The hemi spherical crown of the boiler shell gives maximum strength to withstand the pressure of the steam inside the boiler. The hemi-spherical crown of the fire box is advantageous for resisting intense heat. This shape is also advantageous for the absorption of the radiant heat from the furnace.
In which boiler there is no steam drum?
water tube boiler
Steam drum is observed in water tube boiler. primary function is to seperate steam from water. So mostly fire tube boiler don’t contain steam drum.
Which type of boiler is it when the furnace is placed in the region of boiling water?
internally fired boilers
6. Which type of boiler is it when the furnace is placed in the region of boiling water? Explanation: If the furnace region is placed in the region of boiling water, the boilers are termed as internally fired boilers.
Is hemispherical dome shaped section of a boiler where burning of fuel happens?
Crown: it is the hemispherical dome shaped section of the boiler wherein the burning of fuel happens. Pressure Gauge: it is used in several places to measure the pressure of steam inside the boiler. Safety Valve: it helps to blow off the extra steam when steam pressure inside the boiler reaches above safety level.
What is the purpose of boiler drum?
A steam drum is a standard feature of a water-tube boiler. It is a reservoir of water/steam at the top end of the water tubes. The drum stores the steam generated in the water tubes and acts as a phase-separator for the steam/water mixture.
Are boilers classified based on its heat source?
B Boilers are sometimes classified by their heat sources. For example, boilers are often referred to as oil-fired, gas-fired, coal-fired, or solid fuel-fired boilers. Coal-fired boilers can be further divided based on the equipment used to fire the boiler.
What is a dished end on a boiler?
Dished end, also called dished head or tank head, is an important pressure element for pressure vessels and boilers. The dished end is usually used at both ends of the pressure vessel and welded with the cylinder.
What are the main components of a boiler?
General Components of Boilers Boilers are devices in which water is boiled and converted into steam under controlled con – ditions. Boiler components can vary, but the most common components include a firebox, burners, drums, tubes, an economizer, a steam distribution system, and a boiler feedwater system.
What is the design pressure for a hemi cylinder?
This cylinder and the seams joining it to any attached heads are fully radiographed, and there is no corrosion allowance. The ASME VIII-1 calculated design pressure for the cylinder is 420 psi. Four commonly used head types on vessels are Hemispherical (Hemi), Semi Elliptical (SE), Flanged and Dished (F&D) and Flat.
What are the characteristics of a hemispherical dish end?
Hemispherical dish end are semi or nearly half spherical shell, smaller diameter hemispherical heads can be integrally formed. It is difficult to press the larger diameter as a whole.Therefore, it is necessary to use several trapezoidal spheres of the same size and a circular ball (crown) at the top center to weld.