13-09-2014, 03:44 PM
INDUSTRIAL VALVE PLANT BHEL, GOINDWAL
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. BHEL – an overview
BHEL is the largest engineering and manufacturing enterprise in India in the energy related infrastructure sector today. BHEL was established more than 40 years ago when its first plant was setup in Bhopal ushering in the indigenous Heavy Electrical Equipment Industry in India a dream which has been more than realized with a well recognized track record of performance it has been earning profits continuously since 1971-72.
BHEL caters to core sectors of the Indian Economy viz., Power Generation's & Transmission, Industry, Transportation, Telecommunication, Renewable Energy, Defense, etc. The wide network of BHEL's 14 manufacturing division, four power Sector regional centres, over 150 project sites, eight service centres and 18 regional offices, enables the Company to promptly serve its customers and provide them with suitable products, systems and services – efficiently and at competitive prices. BHEL has already attained ISO 9000 certification for quality management, and ISO 14001 certification for environment management.
POWER GENERATION
Power generation sector comprises thermal, gas, hydro and nuclear power plant business as of 31.03.2001, BHEL supplied sets account for nearly 64737 MW or 65% of the total installed capacity of 99,146 MW in the country, as against nil till 1969-70.
BHEL has proven turnkey capabilities for executing power projects from concept to commissioning, it possesses the technology and capability to produce thermal sets with super critical parameters up to 1000 MW unit rating and gas turbine generator sets of up to 240 MW unit rating. Co-generation and combined-cycle plants have been introduced to achieve higher plant efficiencies. to make efficient use of the high-ash-content coal available in India, BHEL supplies circulating fluidized bed combustion boilers to both thermal and combined cycle power plants.
The company manufactures 235 MW nuclear turbine generator sets and has commenced production of 500 MW nuclear turbine generator sets.
Custom made hydro sets of Francis, Pelton and Kapian types for different head discharge combination are also engineering and manufactured by BHEL.
In all, orders for more than 700 utility sets of thermal, hydro, gas and nuclear have been placed on the Company as on date. The power plant equipment manufactured by BHEL is based on contemporary technology comparable to the best in the world and is also internationally competitive.
The Company has proven expertise in Plant Performance Improvement through renovation modernisation and uprating of a variety of power plant equipment besides specialised know how of residual life assessment, health diagnostics and life extension of plants.
INDUSTRIES
BHEL is a major contributor of equipment and systems to industries. Cement, sugar, fertilizer, refineries, petrochemcials, paper, oil and gas, metallurgical and other process industries lines and improving system stability and voltage regulation, shunt compensation systems (for power factor and voltage improvement) and HVDC systems (for economic transfer of bulk power) BHEL has indigenously developed the state-of-the-art controlled shunt reactor (for reactive power management on long transmission lines). Presently a 400 kV FACTS (Felxible AC Transmission System) projects is under execution.
Industries
Body
The main Pressure containing structure of the valve and the most easily identified as it forms the mass of the valve. It contains all of the valve's internal parts that will come in contact with the substance being controlled by the valve. The bonnet is connected to the body and provides the containment of the fluid, Gas, or Slurry that is being controlled.
Globe valves are typically two-port Valve, although three port valves are also produced. Ports are openings in the body for fluid flowing in or out. The two ports may be oriented straight across from each other on the body, or oriented at an angle such as a 90° angle. Globe valves with ports at such an angle are called angle globe valves.
Stem
The stem serves as a connector from the actuator to the inside of the valve and transmits this actuation force. Stems are either smooth for actuator controlled valves or threaded for manual valves.
MACHINE SHOP
Machining is any of various processes in which a piece of raw material is cut into a desired final shape and size by a controlled material-removal process. The many processes that have this common theme, controlled material removal, are today collectively known as subtractive manufacturing, in distinction from processes of controlled material addition, which are known as additive manufacturing.
The precise meaning of the term "machining" has evolved over the past two centuries as technology has advanced. During the Machine Age, it referred to (what we today might call) the "traditional" machining processes, such as turning, boring, drilling, milling, broaching,sawing, shaping, planing, reaming, and tapping.[1] In these "traditional" or "conventional" machining processes, machine tools, such aslathes, milling machines, drill presses, or others, are used with a sharp cutting tool to remove material to achieve a desired geometry.[2]Since the advent of new technologies such as electrical discharge machining, electrochemical machining, electron beam machining,photochemical machining, and ultrasonic machining, the retronym "conventional machining" can be used to differentiate those classic technologies from the newer ones. In current usage, the term "machining" without qualification usually implies the traditional machining processes.
The three principal machining processes are classified as turning, drilling and milling. Other operations falling into miscellaneous categories include shaping, planing, boring, broaching and sawing
WELD SHOP
Welding is a fabrication or sculptural process that joins materials, usually metals or thermoplastics, by causing coalescence. This is often done by melting the workpieces and adding a filler material to form a pool of molten material (the weld pool) that cools to become a strong joint, with pressure sometimes used in conjunction with heat, or by itself, to produce the weld. This is in contrast with solderingand brazing, which involve melting a lower-melting-point material between the workpieces to form a bond between them, without melting the workpieces.
Many different energy sources can be used for welding, including a gas flame, an electric arc, a laser, an electron beam, friction, andultrasound. While often an industrial process, welding may be performed in many different environments, including open air, under waterand in outer space. Welding is a potentially hazardous undertaking and precautions are required to avoid burns, electric shock, vision damage, inhalation of poisonous gases and fumes, and exposure to intense ultraviolet radiation.
.DRILLING SHOP
Drilling is a cutting process that uses a drill bit to cut or enlarge a hole of circular cross-section in solid materials. The drill bit is a rotarycutting tool, often multipoint. The bit is pressed against the workpiece and rotated at rates from hundreds to thousands of revolutions per minute. This forces the cutting edge against the workpiece, cutting off chips (swarf) from the hole as it is drilled.
Drilled holes are characterized by their sharp edge on the entrance side and the presence of burrs on the exit side (unless they have been removed). Also, the inside of the hole usually has helical feed marks.
Drilling may affect the mechanical properties of the workpiece by creating low residual stresses around the hole opening and a very thin layer of highly stressed and disturbed material on the newly formed surface. This causes the workpiece to become more susceptible to corrosion at the stressed surface.A finish operation may be done to avoid the corrosion.Zinc plating or any other standard finish opertion of 14 to 20 µm can be done which helps to avoid any sort of corrosion.