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Showing posts with the label power plant maintenance

Why does vacuum in steam condenser reduce or drop??

  1-High exhaust temperature: Vacuum drops or maintains at lower side due to high exhaust steam temperature flow into steam condenser. This high exhaust temperature is mainly due to 1-Operation of Turbine at lower loads 2-More clearance in labyrinth seals 3-Not operating exhaust hood sprays 4-More load on condenser 5-Breaking of ejector U loop 2-Low circulating cooling water flow Vacuum in condenser reduces due to inadequate cooling water flow through steam condenser. This is mainly due to; 1-Problems associated with pumps 2-Air pockets in pipe line 3-Leakages in cooling water line 4-Stuck of discharge valve of pump 3-High cooling water temperature at condenser inlet Higher cooling water temperature at condenser inlet results into reduction of vacuum due to poor heat transfer from steam to water 4-Poor heat transfer in condenser Very less or poor heat transfer in steam condenser reduces vacuum to very low level resulting into high exhaust temperature &am

Various IBR forms, acts & regulations for a power plant engineers

Sl No. IBR Form No. Details of forms 1 I Memorandum for Boiler inspection or registration 2 II Issued by inspection authority during new construction 3 II A Issued by inspection authority during new construction for foreign code boilers 4 III Certificate of manufacture issued by constructor 5 III A Steam pipe line test certificate  issued by manufacturer 6 III B Tubes  test certificate issued by manufacturer 7 III C Test certificates for  fittings & mountings (Valves,bend,elbow,tee etc) 8 III F Test certificates of casting & forging issued by manufacturer 9 V Boiler use provisional order issued by Boiler inspector authority 10 VI Certificate issued by  directorate of steam boiler for boiler use 11 VII Inspecting authority (directorate of steam boiler) certif

Valves: DO you know these..???

  Valve is a Mechanical or electromechanical device which is used to control the flow, pressure & temperature of fluid. Generally Globe valve, Gate valves, Butterfly valve, diaphragm valve, needle valve, Non return valves etc used in power plant various applications. The materials which are directly in contact with high pressure & temperature fluid are called trim materials. IBR Valves materials are manufactured according to the ASME class 16.34 B “Y” type globe valves have minimum pressure drop as compared to normal globe valves WCB indicates cast carbon steel, includes the standard A 216 . Used for fluid temperature up to 425 deg C WC-6 indicates Chromium Molybdenum steel, includes the standard A 217. Used for fluid temperature up to 575 deg C WC-9 indicates Cast alloy steel, includes the standard A 217. Used for fluid temperature up to 593 deg C SA 105 indicates forged & SA 182 indicates forged alloy steels Equivalent grades of valves: SA 216 WCB/WCC

Selected Questions & Answers on Rigging guidelines

1. What is rigging technology? Rigging is the process of using hoists, ropes, pulley, slings, jacks and cranes for lifting, lowering or shifting the heavy objects. 2. Who is rigger? A person who leads or carries out the rigging process. 3. What are the various rigging elements used in power plant? Synthetic and wire ropes Slings Chain hoist/chain block Pulley block Screw and hydraulic jacks Crane Winch machine EOT cranes Derricks…etc. 4. Write a short note on rigging plan. In order to ensure the safety of workers and the equipment involved, any operation involving the use of a lifting item to lift items must be planned thoroughly before being carried out. Rigging Plan Involves: 1. Determination of Task and Job Site Requirements: a. What is to be lifted? b. Who is the in charge person? c. What are the job site requirements? d. What type of lift? Ordinary Lift: Involve the use of basic hoisting equipment directly above the load. The load