ASHRAE Journal - April 2011 - 50
In Marine Refrigeration Systems C
By Amey S. Majgaonkar, M.E.
Controlling Corrosion
orrosion problems are severe in marine refrigeration and airconditioning plants. Although corrosion can affect production in commercial applications, in naval warships and submarines, corrosion can affect the crew’s survival. This article discusses corrosion control in marine refrigeration systems, but similar methodologies to control corcoating. Regular inspection and repair of the coating are necessary to achieve reliable and lasting protection. Materials such as aluminium, titanium, stainless steel and alloys are used in heat exchangers, pressure vessels, piping, valves and accessories. In this case, a thin film of corrosion can form on the surface spontaneously. The oxide film is tightly adherent, stable and self-healing and isolates the surface from the corrosive environment. The film acts as a barrier to further oxidation. When the film stops growing at less than a micrometer thick, the metal becomes passive toward further corrosion and the phenomenon known as passivation occurs. In conditions where chlorine atoms are present (i.e., seawater), the ability to form a passivating film is hindered, and the film destabilizes, causing pitting corrosion. Pitting corrosion
rosion are applicable for any refrigeration system.
The main types of corrosion occurring in marine refrigeration systems are electrochemical, galvanic, pitting, cavitation, stress concentration cracking, crevice, and fouling. Present and surrounding moisture also cause marine refrigeration systems to experience corrosion. corrosion. This type of damage typically produces oxide(s) of the original metal. The corrosion can be uniform or localized and is not stable or self-healing. With heat exchangers and pressure vessels, designers usually follow the guidance in various standards from such groups as the American Society of Mechanical Engineers (ASME) and the Tubular Exchanger Manufacturers Association (TEMA), etc. To control electrochemical corrosion, isolate the corroding metal from the corrosive environment using paint and a protective
ashrae.org
Electrochemical Corrosion
In metals, corrosion is caused by the loss of electrons reacting with water and oxygen. Rusting, the weakening of iron due to oxidation of the iron atoms, is a well-known example of electrochemical
50 ASHRAE Journal
About the Author
Amey S. Majgaonkar, M.E., is an assistant manager at Kirloskar Pneumatic Company Limited in Pune, India. He is a member of ISHRAE.
April 2011
ASHRAE Journal - April 2011
Table of Contents for the Digital Edition of ASHRAE Journal - April 2011
ASHRAE Journal - April 2011
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Making the Case for Energy Metering
BIM Test at ASHRAE HQ
Technology Award Case Studies: Adaptive Reuse for Clinics
Earthquake: New Codes Provide Tools, But We Need to Ensure Compliance
Controlling Corrosion in Marine Refrigeration Systems
Solar NZEB Project
Emerging Technologies
IAQ Applications
Washington Report
Products
Special Products
Classified Advertising
Advertisers Index
ASHRAE Journal - April 2011 - Intro
ASHRAE Journal - April 2011 - ASHRAE Journal - April 2011
ASHRAE Journal - April 2011 - Cover2
ASHRAE Journal - April 2011 - 1
ASHRAE Journal - April 2011 - 2
ASHRAE Journal - April 2011 - Contents
ASHRAE Journal - April 2011 - Commentary
ASHRAE Journal - April 2011 - 5
ASHRAE Journal - April 2011 - Industry News
ASHRAE Journal - April 2011 - 7
ASHRAE Journal - April 2011 - 8
ASHRAE Journal - April 2011 - 9
ASHRAE Journal - April 2011 - 10
ASHRAE Journal - April 2011 - 11
ASHRAE Journal - April 2011 - 12
ASHRAE Journal - April 2011 - 13
ASHRAE Journal - April 2011 - 14
ASHRAE Journal - April 2011 - 15
ASHRAE Journal - April 2011 - Letters
ASHRAE Journal - April 2011 - 17a
ASHRAE Journal - April 2011 - 17b
ASHRAE Journal - April 2011 - 17
ASHRAE Journal - April 2011 - Meetings and Shows
ASHRAE Journal - April 2011 - 19
ASHRAE Journal - April 2011 - Making the Case for Energy Metering
ASHRAE Journal - April 2011 - 21
ASHRAE Journal - April 2011 - 22
ASHRAE Journal - April 2011 - 23
ASHRAE Journal - April 2011 - 24
ASHRAE Journal - April 2011 - 25
ASHRAE Journal - April 2011 - 26
ASHRAE Journal - April 2011 - 27
ASHRAE Journal - April 2011 - BIM Test at ASHRAE HQ
ASHRAE Journal - April 2011 - 29
ASHRAE Journal - April 2011 - 30
ASHRAE Journal - April 2011 - 31
ASHRAE Journal - April 2011 - 32
ASHRAE Journal - April 2011 - 33
ASHRAE Journal - April 2011 - 34
ASHRAE Journal - April 2011 - 35
ASHRAE Journal - April 2011 - 36
ASHRAE Journal - April 2011 - 37
ASHRAE Journal - April 2011 - Technology Award Case Studies: Adaptive Reuse for Clinics
ASHRAE Journal - April 2011 - 39
ASHRAE Journal - April 2011 - 40
ASHRAE Journal - April 2011 - 41
ASHRAE Journal - April 2011 - 42
ASHRAE Journal - April 2011 - 43
ASHRAE Journal - April 2011 - Earthquake: New Codes Provide Tools, But We Need to Ensure Compliance
ASHRAE Journal - April 2011 - 45
ASHRAE Journal - April 2011 - 46
ASHRAE Journal - April 2011 - 47
ASHRAE Journal - April 2011 - 48
ASHRAE Journal - April 2011 - 49
ASHRAE Journal - April 2011 - Controlling Corrosion in Marine Refrigeration Systems
ASHRAE Journal - April 2011 - 51
ASHRAE Journal - April 2011 - 52
ASHRAE Journal - April 2011 - 53
ASHRAE Journal - April 2011 - 54
ASHRAE Journal - April 2011 - 55
ASHRAE Journal - April 2011 - 56
ASHRAE Journal - April 2011 - 57
ASHRAE Journal - April 2011 - 58
ASHRAE Journal - April 2011 - 59
ASHRAE Journal - April 2011 - Solar NZEB Project
ASHRAE Journal - April 2011 - 61
ASHRAE Journal - April 2011 - 62
ASHRAE Journal - April 2011 - 63
ASHRAE Journal - April 2011 - 64
ASHRAE Journal - April 2011 - 65
ASHRAE Journal - April 2011 - Emerging Technologies
ASHRAE Journal - April 2011 - 67
ASHRAE Journal - April 2011 - 68
ASHRAE Journal - April 2011 - 69
ASHRAE Journal - April 2011 - IAQ Applications
ASHRAE Journal - April 2011 - 71
ASHRAE Journal - April 2011 - 72
ASHRAE Journal - April 2011 - 73
ASHRAE Journal - April 2011 - Washington Report
ASHRAE Journal - April 2011 - Products
ASHRAE Journal - April 2011 - Special Products
ASHRAE Journal - April 2011 - Classified Advertising
ASHRAE Journal - April 2011 - 78
ASHRAE Journal - April 2011 - 79
ASHRAE Journal - April 2011 - Advertisers Index
ASHRAE Journal - April 2011 - Cover3
ASHRAE Journal - April 2011 - Cover4
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