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

Energy method, A semi circular frame of flexural rigidity EI is built at A ...

A semi circular frame of flexural rigidity EI is built at A and caries a vertical load W at B. calculate the magnitude of the vertical and horizontal deflection at B and hence the

Relationships among vm, Relationships among VM, Virtual Prototyping, the Vi...

Relationships among VM, Virtual Prototyping, the Virtual Enterprise Virtual Manufacturing (VM) VM is a synthetic, integrated manufacturing environment exercised to improve

Determine fluid pressure, 1 A hydraulic pump generates 240W and supplies hy...

1 A hydraulic pump generates 240W and supplies hydraulic fluid at a rate of 5.1l/min to a linear actuator which has a bore size of 50 mm and a double piston rod diameter of 20mm. I

Formed heads of vessels, Q. Formed heads of vessels? Formed heads are g...

Q. Formed heads of vessels? Formed heads are generally of 2:1 semi ellipsoidal form, but other heads may be used, such as hemispherical, torispherical, conical and toriconical.

Special tool and cleaning of part general service tips , Special Tool: Use...

Special Tool: Use special tools wherever applicable. Special tools are designed to dismantle or assemble a specific part or assemblies without causing damage to them. Cleaning

Key words related to air transportation, Keywords related to Air transporta...

Keywords related to Air transportation: Airfield/Airport       :            The area which contains the facilities needed for the operation of aircraft. Apron

Requirement of temperature scale - thermodynamics, Requiremen t of Tempera...

Requiremen t of Temperature Scale: The temperature scale on which temperature of the system can be read is required to assign the numerical values to the thermal state of the

A common cell control software, A Common Cell Control Software  In this...

A Common Cell Control Software  In this section, fine and common implemented cell control software are developed, that is based upon a transition table, to show the restriction

What is squeeze time, Q. What is Squeeze time? It is the time between t...

Q. What is Squeeze time? It is the time between the initial application of the electrode pressure on the work and the initial application of current to make the weld. During th

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