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

Evaluate the velocity ratio, (a) A geometrically similar model of spillway ...

(a) A geometrically similar model of spillway is to be laid to a scale of 1 in 50. Evaluate the velocity ratio, discharge ratio and acceleration ratio. (b) If model prototype ra

Explain the protocol for stress testing, Q. Explain the protocol for stress...

Q. Explain the protocol for stress testing? The protocol for stress testing should be structured to include the following: 1) Continuous ECG monitoring. 2) Hard copy ECG

How many types of foundations are there, How many types of Foundations are ...

How many types of Foundations are there Foundations are broadly classified into two types, viz., shallow and deep foundations with respect to  the width (B) and depth (D) below

Perform a beam modal analysis, 1) Figure shows a thin Aluminium structural ...

1) Figure shows a thin Aluminium structural beam use in an aircraft structure.  Using the stiffness method, determine the BM and Shear force of the two elements of the thin beam sh

Contrary to the misconception, Contrary to the misconception that the grow...

Contrary to the misconception that the growth in automobile industry has catered only to the higher income-stratum of society by producing mostly passenger cars, the fastest growt

Packaging Line Design, i am working as a packaging line design engineer & i...

i am working as a packaging line design engineer & i need to connect 2 cup filling machines to a single line. how do i solve this

Statements of second law of thermodynamics, (a) Show that two statements of...

(a) Show that two statements of Second Law of thermodynamics are equivalent to each other. (b) A house that was heated by electric resistance heater consumed 1200 KWh of electri

Co2 welding-power source, CO2 WELDING-Power Source Normally, a power so...

CO2 WELDING-Power Source Normally, a power source with constant potential characteristics is used for CO 2 welding as it has the ability to self regulate the welding arc. The

How are footings described and introduced properly, How are footings descri...

How are footings described and introduced properly? The selection of different types of footings and the need for reinforcing the same are discussed in this unit. Methods of de

Define the adjustable auger mechanisms, Define the Adjustable auger mechani...

Define the Adjustable auger mechanisms They improved mounting arrangement for the auger and auger drive mechanism of a floating screed type asphalt paver. And they provide actu

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