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Q. What is Forced Draft Fan?
Fan shall comply with API 673 as supplemented by the following: (para. references are to API 673).
Where the intake air is unfiltered, the Vendor shall provide a fan cleaning facility using compressed air at 120 psig (828 kPag). Cleaning system shall function with fan in operation without adverse affects to fan or Steam Generator performance. System shall be manually activated.
Steam Generator Vendor shall be responsible for demonstrating that loads imposed on the fan from ducting under all operating scenarios are acceptable to fan Vendor.
Riveted fan wheels are not permitted
Torsional response studies are not required
Fan and motor balancing shall be done without the coupling half in place. A half key of equal length to that used to secure coupling half shall be used during balancing.
A spot faced 1 inch diameter area shall be provided in three planes at each bearing location (as permitted by access) for mounting magnetic vibration probes.
Fan shall meet the following requirements at its rated point:
Fans shall be direct driven by constant speed electric motors.
a)What are methods used in rating for time study. Illustrate them. b) Write down principles of motion economy.
a) Determine the value of σ 0 to cause failure when θ=30°, according to the maximum stress failure criterion. Consider both σ 0 > 0 and σ 0 e.g. "failure in longitudinal tens
Q. Local operator panel for steam generator? A local operator's panel is required for operator use during Steam Generator light off. This panel shall contain the following equ
In a 15 TR ammonia refrigerator plant the condensing temperature is 25 0 C and the evaporative temperature is -10 0 C. The refrigerant ammonia is subcooled by 50C before passing th
Calculate plastic zone: Calculate plastic zone ahead of crack in above problem if σY = 250 MPa. Solution From Eq. Here KI is taken as KI max since the plastic
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