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Q. What do you mean by Risers and Downcomers?
Risers and downcomers shall be staggered along the shell of the WHB and steam drum for uniform water/steam circulation in the system, taking into account the varying heat fluxes along the length of tubes. Film boiling (or dry-out) must be avoided in order to prevent tubes from destroying by deformity. The first pair of downcomers and the riser shall not be located further than 150 mm (6") form the inlet tubesheet. This distance of 150 mm is from the edge of the tubesheet to the nearest edge of the downcomer pipes.
The downcomer flow velocity shall be restricted to 1.52 m/s (5 ft/s). impingement plates, if provided shall not be welded to nozzle necks and tubes. Perforated plates are not acceptable.
The circulation of WHB system shall be computed for each circuit of downcomer and risers. A detail FEA shall be performed to predict water/steam circulation ratios. The FEA shall be based on an internationally recognized program, such as ANSIS or ALGOR and shall be submitted to WorleyParsons Canada for approval. Unsuitable programs, unacceptable to WorleyParsons Canada, shall be avoided.
The Mechanical Engineer/Specialist shall be responsible for specifying Vendor Drawings and Data Requirements in the MRQ and MRP using the WorleyParsons standard vendor drawing and
1. store energy 2. apply force on a body 3. balance force between two bodies 4. absorb vibrations of body
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Q. Explain working of Tubesheets? The tube and tube pitch selected shall be approved by WorleyParsons Canada. The preferred tube pitch shall be a minimum of 1.3 x tube OD and
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Under Damping If the restoring force is larger than friction, and the oscillation is classified as under-damped. In this case, ω is real and behaves exactly like the solu
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