Corrosion in steam condensate system, Mechanical Engineering

Assignment Help:

Q. Corrosion in Steam Condensate System?

Carbon dioxide and oxygen, either acting alone or in combination, account for the majority of steel corrosion problems in the condensate system.

The make-up water usually contains bicarbonate and carbonates. These species can accumulate and decompose in boilers at high temperatures to form carbon dioxide.
When the steam condenses, part of the carbon dioxide gas dissolves in the condensate (mostly in low pressure condensate) and forms carbonic acid.

The primary source of oxygen in the condensate system is air in-leakage at various locations. This includes threaded and other mechanical joints; packing glands of condenser return pumps, faulty steam traps, and areas under vacuum or areas where the system pressure is lower than the atmospheric pressure. Another source of oxygen is DO in the BFW due to improper oxygen scavenging process.

Simultaneous presence of oxygen and carbon dioxide in condensate can produce a synergistic interaction, resulting in severe corrosion rates.

Two forms of corrosion, general corrosion and pitting, can occur in the condensate system.General corrosion or thinning will occur at lower pH values, and pitting will occur at higher pH values.


Related Discussions:- Corrosion in steam condensate system

Explain classification of welding processes, Classification Of Welding Proc...

Classification Of Welding Processes The classificated depending upon the nature of heat source and its movement resulting in spot, seam or zonal welds; or on the extent of heat

Materials weldability, MATERIALS WELDABILITY Electron beam welding has ...

MATERIALS WELDABILITY Electron beam welding has the ability to weld a variety of materials including dissimilar combinations. These can be split into general categories as to t

Arc initiation-touch start-high frequency start, ARC INITIATION Touch...

ARC INITIATION Touch Start With the power supply energised and the shielding gas flowing through the cup, the torch is lowered toward the workpiece until the tungsten electr

Explain caustic stress corrosion cracking, Q. Explain caustic Stress Corros...

Q. Explain caustic Stress Corrosion Cracking? Dilution of the caustic prior to injection into a relatively hot stream will minimize the potential of caustic Stress Corrosion Cr

Explain rake angle - angles of a drill, Explain Rake angle - Angles of a dr...

Explain Rake angle - Angles of a drill It is also known as helix angle .It is the angle formed between a plane containing the drill axis and the leading edge of the land. It c

FEED WATER PUMP, #what is the ratio between thirst pr. and discharge pr.? ....

#what is the ratio between thirst pr. and discharge pr.? ..

Newton''s first law of motion - mechanics, Newton's first law of motion: ...

Newton's first law of motion: First law of Newton: It is magnitude of force that develops acceleration of 1 m/s2 in 1 kg mass of the body. The subject of rigid body mecha

Cranes, Cranes are used to move materials vertically and laterally in ...

Cranes are used to move materials vertically and laterally in ain area of limited length. They may he operated hydraulically pneumatically or electrically the important ty

Determine the time response for the system, For two waves period, determine...

For two waves period, determine the time response x(t) for the system (ignoring viscous damping effect only)  Give=n: X0=0.09615 , θ(radians)=0.110*π , μk=0.80000 , μs=0.90000 , K=

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