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

Mechanical data for line designation tables, Line Designation Tables (LDT's...

Line Designation Tables (LDT's) (Appendix "D") are initially generated by the Piping designers. Design conditions are inputed by the Process discipline, and the Mechanical Engineer

Arc welding power sources-arc characteristics, ARC CHARACTERISTICS In ...

ARC CHARACTERISTICS In order to understand the different output characteristics that are required by the welding power source it is necessary to understand the load which is f

Find out the forces in the members of the tower, Find out the forces in the...

Find out the forces in the members of the tower: Find out the forces in the members of the tower. Solution By symmetry, ∠ AFG = ∠ AGF = θ and HG = 7.5 m; while AH = 3

Design transfer facilities in plant, Q. Design Transfer Facilities in plant...

Q. Design Transfer Facilities in plant? Transfer facilities (e.g. pumps, piping, and conveyers) must be arranged so that no leaks can escape the confines of the bund / dike, an

Uniformly distributed load and uniformly varying load, Uniformly Distribute...

Uniformly Distributed Load and Uniformly Varying Load: Uniforml y Distributed Load (UDL) A UDL is one which is spread over beam in such a manner that the rate of loading

Java Language and Virtual Machine Specifications, I need assignment help in...

I need assignment help in Java Language and Virtual Machine Specifications, write short notes on Java Language and Virtual Machine Specifications.

Explain about active fire protection, Q. Explain about Active Fire Protecti...

Q. Explain about Active Fire Protection? Active Fire Protection - A fire fighting system that is normally dormant and is activated automatically upon detection of a fire hazard

Discover the maximum safe air pressure, Discover the maximum safe air press...

Discover the maximum safe air pressure: A cylindrical compressed air drum is equal to 2 m in diameter along plates 12.5 mm thick. The efficiencies of the longitudinal (η l ) a

High duty tool and die steels, High Duty Tool and Die Steels: High du...

High Duty Tool and Die Steels: High duty punching tools or dies are made out of a lot of various steels of fairly high alloying contents. High-carbon high-chromium die steel

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