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

Two stroke and four stroke engines, T w o Stroke and Four Stroke Engines:...

T w o Stroke and Four Stroke Engines: In  the two stroke engines thermodynamic cycle is completed in One revolution of crank shaft whereas in 4 stroke engines the cycle is c

Type of strain, Type of strain: There are basically four type of strai...

Type of strain: There are basically four type of strain 1. Tensile strain 2. Compressive strain 3. Volumetric strain 4. Shear strain

Flat capacity strategy, What is the total value added by the new workshop i...

What is the total value added by the new workshop in Year 1 of the 5-year plan? Assuming that the average quarterly demand is maintained over the remaining years of the 5-year p

About cam''s use, Which type of cam is used in general 2 wheelers?and how t...

Which type of cam is used in general 2 wheelers?and how the type of profile is determined?

The ordinate dimension command-autocad, The Ordinate Dimension Command ...

The Ordinate Dimension Command We can use The Ordinate command to annotate co-ordinate points with X or Y values. This might be useful for setting-out on site plans.

Find the horizontal hydrostatic force, Question. In the system shown below...

Question. In the system shown below, the force exerted by the free jet issuing from the sharp-edged circular nozzle and impinging on the small circular plate is just su±cient to k

Force on string - mechanics, Force on String: A string ABCD , attach...

Force on String: A string ABCD , attached to the two fixed points A and D has two weight of 1000N each attached to it at points B and C . The weights rest with portio

Determine the origin of step, Determine the Origin of STEP Considerable...

Determine the Origin of STEP Considerable progress has been made in vector data exchange over the recent past. Initially, some CAD/CAM vendors offered direct translator softwar

Refrigeration, A refrigeration system produces 40 kg/hr of ice at 0oC from ...

A refrigeration system produces 40 kg/hr of ice at 0oC from water at 25oC. Find the refrigeration effect per hour and TR. If it consumes 1 kW of energy to produce the ice,

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