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

Program evaluation and review techniques, Program Evaluation and Review Tec...

Program Evaluation and Review Techniques: The Rola and Cola Corporation is a professional II nursing home aspiring to become I nursing home. It desires to provide the ultimate

CAE & modelling, when is scaling transformation termed as linear

when is scaling transformation termed as linear

Draw the bending moment and shear force diagram, Draw the bending moment an...

Draw the bending moment and shear force diagram for the following cases : a) A cantilever beam of length (L) carrying a Point load (W)at its free end. b) A simply supported b

Motion on the inclined plane when the surface is smooth, Motion on the incl...

Motion on the inclined plane when the surface is smooth: Sol:  WHEN THE SURFACE SMOOTH   The Figure given shows a body having weight W, sliding down on a smooth in

Calculate the period of vibration, (a) Show energy method and Rayleigh's me...

(a) Show energy method and Rayleigh's method for single degree of freedom system. Also discuss its application. (b) A sphere of diameter D floats half submerged in water. If the

Product Design and Development, I need a work to be done in the field of te...

I need a work to be done in the field of technical function generation for a product development process and about 3000-3500 words on any theoretical topic related to product devel

Determine the compressor work, (a) A four cylinder engine operates at 1200 ...

(a) A four cylinder engine operates at 1200 rpm gave 18.6 KW brake power, the average torque when one cylinder was cut-off was 105 N-m. Evaluate the indicated thermal efficiency if

What is floating foundation, What is floating foundation? Floating Foun...

What is floating foundation? Floating Foundation: Raft or mat is also recommended when the soil mass contains compressible layers or the soil stratum is variable. In such ca

CIM, CIM in architecture?

CIM in architecture?

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