{"id":220228,"date":"2025-05-28T03:59:41","date_gmt":"2025-05-28T03:59:41","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=220228"},"modified":"2025-05-28T03:59:44","modified_gmt":"2025-05-28T03:59:44","slug":"why-is-calgon-conditioning-better-than-phosphate-conditioning","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/28\/why-is-calgon-conditioning-better-than-phosphate-conditioning\/","title":{"rendered":"Why is calgon conditioning better than phosphate conditioning"},"content":{"rendered":"\n
Why is calgon conditioning better than phosphate conditioning? Explain the following:<\/p>\n\n\n\n
a. Scale and sludge formation and their disadvantages<\/p>\n\n\n\n
b. Caustic embrittlement<\/p>\n\n\n\n
c. Boiler corrosion<\/p>\n\n\n\n
What is hardness of water? How is it determined by EDTA method?<\/p>\n\n\n\n
T he Correct Answer and Explanation is :<\/mark><\/strong><\/p>\n\n\n\n
Why Calgon Conditioning is Better than Phosphate Conditioning<\/strong><\/h3>\n\n\n\n
Calgon conditioning<\/strong> (using sodium hexametaphosphate) is better than phosphate conditioning<\/strong> because:<\/p>\n\n\n\n
\n
Calgon<\/strong> prevents scale formation by forming soluble complexes with calcium and magnesium ions, keeping them in solution.<\/li>\n\n\n\n
It works at both high and low temperatures and doesn\u2019t form precipitates.<\/li>\n\n\n\n
Phosphate conditioning leads to the formation of soft sludge, which can still deposit under high heat or flow restrictions.<\/li>\n\n\n\n
Calgon is more efficient in preventing scale and maintaining boiler efficiency over a wider range of operating conditions.<\/li>\n<\/ul>\n\n\n\n\n\n\n\n
(a) Scale and Sludge Formation and Their Disadvantages<\/strong><\/h3>\n\n\n\n
\n
Scale<\/strong> is a hard, adherent deposit (mainly of CaCO\u2083, CaSO\u2084, etc.) formed on boiler walls due to precipitation of dissolved salts at high temperatures.<\/li>\n\n\n\n
Sludge<\/strong> is a soft, loose precipitate (e.g., Mg(OH)\u2082, Ca\u2083(PO\u2084)\u2082) that settles at cooler areas of the boiler.<\/li>\n<\/ul>\n\n\n\n
Disadvantages:<\/strong><\/p>\n\n\n\n
\n
Reduced heat transfer efficiency<\/li>\n\n\n\n
Overheating and tube damage<\/li>\n\n\n\n
Increased fuel consumption<\/li>\n\n\n\n
Risk of boiler explosion<\/li>\n<\/ul>\n\n\n\n\n\n\n\n
(b) Caustic Embrittlement<\/strong><\/h3>\n\n\n\n
\n
It\u2019s a type of corrosion caused by the concentration of NaOH<\/strong> in stressed parts of the boiler.<\/li>\n\n\n\n
High concentrations cause intergranular cracks in steel, making it brittle.<\/li>\n\n\n\n
Occurs when Na\u2082CO\u2083 (used for water softening) decomposes to NaOH under high pressure.<\/li>\n<\/ul>\n\n\n\n
Prevention:<\/strong><\/p>\n\n\n\n
\n
Use of phosphate or lignin-based treatments instead of Na\u2082CO\u2083<\/li>\n\n\n\n
Adding inhibitors like tannin or sodium sulfate<\/li>\n<\/ul>\n\n\n\n\n\n\n\n
(c) Boiler Corrosion<\/strong><\/h3>\n\n\n\n
\n
It\u2019s the chemical or electrochemical deterioration of boiler metal.<\/li>\n\n\n\n
Caused by dissolved oxygen, CO\u2082, acids, or salts<\/strong> in water.<\/li>\n\n\n\n
Leads to pitting, weakening of boiler material, and ultimately failure.<\/li>\n<\/ul>\n\n\n\n
Prevention:<\/strong><\/p>\n\n\n\n
\n
Mechanical deaeration<\/li>\n\n\n\n
Use of oxygen scavengers (e.g., hydrazine, sodium sulfite)<\/li>\n<\/ul>\n\n\n\n\n\n\n\n
Hardness of Water<\/strong><\/h3>\n\n\n\n
Hardness<\/strong> is the concentration of calcium and magnesium ions in water.<\/p>\n\n\n\n\n\n\n\n
EDTA Method for Determining Hardness<\/strong><\/h3>\n\n\n\n\n
EDTA (ethylenediaminetetraacetic acid)<\/strong> forms stable, colorless complexes with Ca\u00b2\u207a and Mg\u00b2\u207a.<\/li>\n\n\n\n
Water sample is buffered to pH 10 and treated with Eriochrome Black T indicator.<\/li>\n\n\n\n
Indicator forms a wine-red complex with Mg\u00b2\u207a.<\/li>\n\n\n\n
EDTA is titrated until the color changes from wine-red to blue (endpoint).<\/li>\n\n\n\n
The volume of EDTA used is proportional to the hardness.<\/li>\n<\/ol>\n\n\n\n
Formula:<\/strong> Hardness (mg\/L as CaCO3)=Volume of EDTA (mL)\u00d71000Volume of sample (mL)\\text{Hardness (mg\/L as CaCO}_3) = \\frac{\\text{Volume of EDTA (mL)} \\times 1000}{\\text{Volume of sample (mL)}}<\/p>\n\n\n\n
This method is precise and widely used in water treatment labs.<\/p>\n\n\n\n<\/figure>\n","protected":false},"excerpt":{"rendered":"
Why is calgon conditioning better than phosphate conditioning? Explain the following: a. Scale and sludge formation and their disadvantages b. Caustic embrittlement c. Boiler corrosion What is hardness of water? How is it determined by EDTA method? T he Correct Answer and Explanation is : Why Calgon Conditioning is Better than Phosphate Conditioning Calgon conditioning […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-220228","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/220228","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=220228"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/220228\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=220228"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=220228"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=220228"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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