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

co2 welding, CO2 Welding CO2 Welding is a variation of GMAW. Here the ...

CO2 Welding CO2 Welding is a variation of GMAW. Here the inert gas is replaced by gas mixtures or carbon dioxide, which are chemically active. The carbon dioxide decomposes in

Beam, calculate the vertical reaction at A in Newtons

calculate the vertical reaction at A in Newtons

Find out extension, Find out extension: Q: A bar having length 25mm h...

Find out extension: Q: A bar having length 25mm has varying cross section. It carries load of 14KN. Find out extension if cross section is given by (6 + x 2 /100) mm 2

Working of burner assembly in steam generators, Q. Working of Burner Assemb...

Q. Working of Burner Assembly in steam generators? The Steam Generators shall be equipped with a packaged burner assembly consisting of a burner, combustion air fan, ductwork,

Determine lifting load of crane, Navy divers are called to rescue a group o...

Navy divers are called to rescue a group of office workers trapped in a basement under floodwater in Leeds, UK. The only access to the basement is via a 1.5 x 1.5 m horizontal hatc

Wire feeding unit-co2 welding, WIRE FEEDING UNIT The wire electrodes ar...

WIRE FEEDING UNIT The wire electrodes are supplied as continues coils in wire spools. The solid wires are available in the following sizes 0.8, 1.0, 1.2, 1.6, 2.0 and 2.4 mm di

Changes in mechanical properties along with tempering, Changes in Mechanica...

Changes in Mechanical Properties along with Tempering: Tempering enhances the toughness and ductility of quenched steel though decreases hardness. Following figure demonstrate

Arc strikes-metallurgical defects, Arc strikes Represent any localised ...

Arc strikes Represent any localised heat affected zone caused by an arc. Arc strike tends to produce hardening particularly in high carbon steels and alloy steels. Grinding of

What will happen if air filter is not used?, (a) What will happen if air fi...

(a) What will happen if air filter is not used? (b) What are the components of an air filter? (c) What precautions should be followed while cleaning the air filter? (d) What grade

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