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

Evaluate the power output of turbine, Evaluate the power output of turbine:...

Evaluate the power output of turbine: Q: A turbine in steam power plant operating under steady state conditions receives the superheated steam at 3MPa and 350ºC at the rate o

Evolution of specific volume of wet saturated steam, Evolution of Specific ...

Evolution of Specific volume of wet saturated steam -thermodynamics : Specific volume of wet saturated steam (V we t ) It is volume occupied by unit mass of wet satu

Write down the uses of vernier caliper and steel rule tools, Write down the...

Write down the uses of following tools and make neat sketches of the same : (a) Vernier Caliper (b) Steel Rule

Foundry shiz, is there any assignment answers

is there any assignment answers

Torsional Vibration, Free Torsional Vibration of a Single Rotor System

Free Torsional Vibration of a Single Rotor System

Stress analysis, what is the importance of stress analysis in steels

what is the importance of stress analysis in steels

Original hodgkin-huxley model, 1. Plot the functions x1 and x as functions...

1. Plot the functions x1 and x as functions of voltage 2. Assume that you hold the membrane potential V at -120 mV until the system reaches equilibrium (i.e. until dx=dt = 0, w

Stockholm conference, define environment and explain stockholm conference

define environment and explain stockholm conference

Tributary lateral load, Tributary lateral load:   The question is on a f...

Tributary lateral load:   The question is on a fictitious 1965 building in Albany, NY. It was designed using the 1964 State Building Construction Code, in which Allowable Stress

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