What do you mean by risers and downcomers, Mechanical Engineering

Assignment Help:

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.


Related Discussions:- What do you mean by risers and downcomers

Alignment of a railway line - railways, Alignment of a Railway Line: ...

Alignment of a Railway Line: Selection of Alignment The following points must be considered in selecting the alignment of a railway line : (a) It should be as direct

Explain the conventional frame, Show schematic diagram showing the layout o...

Show schematic diagram showing the layout of transmission system of four-wheel driven car. Explain briefly the following types of frame: (a) Conventional frame (b) Integra

Low lube oil pressure security in API612 , What type of low lube oil securi...

What type of low lube oil security recommended for API612 steam turbines.(Electronic/Mechanical). Please give refrences

Explain streak line and stream function, Describe the following key terms: ...

Describe the following key terms: (i) Stream Line (ii) Path Line (iii) Streak Line (iv) Stream Function (v) Potential flow function (vi) Flow net

Compute the total drag force on the plate , A uniform air stream with veloc...

A uniform air stream with velocity U = 10m/s flows over a flat plate of length 10 meters in the first meter the boundary layer is laminar but beyond this point boundary layer is fu

Corrosion assessment of flare and vru system, Q. Corrosion Assessment of Fl...

Q. Corrosion Assessment of Flare and VRU System? The worst case scenario shall be considered during material selection of Flare KO Drums. Depending on the fluid composition ent

Calculate the critical crack length, Calculate the critical crack length: ...

Calculate the critical crack length: A wide plate of mild steel is subjected to uniform tensile load causing a stress of 100 MPa. Calculate the critical crack length in the ce

What do you mean by turret nozzle, Q. What do you mean by turret Nozzle? ...

Q. What do you mean by turret Nozzle? Turret Nozzle - Turret nozzles are large nozzles that can deliver large quantities of water quickly. They are used on very large fires whe

Heat treating equipment, Heat Treating Equipment: The major equipment...

Heat Treating Equipment: The major equipment for heat treatment is furnace. There are two main categories of furnaces - batch and continuous. The furnace selection needs cons

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd