Caustic Gouging in a Refinery Boiler

Caustic Gouging in a Refinery Boiler - Root Cause and

B&W Learning Center Articles - Babcock & Wilcox

It is clear that the groove scale mostly consist of magnetite and hematite. Moreover, presence of Cu, Cu2O and NaFeO2 was conﬁrmed by XRD. 3.7. Root cause and mechanism of the boiler failure Generally, it was reported that there are three under deposit corrosion namely: (1) hydrogen damage, (2) acid phosphate corrosion and (3) caustic gouging.

(PDF) Impact of Boiler Water Chemistry on Waterside Tube

D. Result and Discussion of Root Cause and Mechanism of the Boiler Tube Failure There are two main factors in incidence of caustic corrosion: (1) presence of caustics in boiler water and (2) concentration mechanism. Load change is one of the main causes of phosphate hideout in which phosphate precipitates and consequently free caustic may form.

A Case Study on Causes of Scale FormationInduced Damage …

Degradation of boiler tubes is one of the important causes of unwanted shutdowns of boilers and petrochemical [1-4]. plants Therefore, the evaluation and assessment of damaged tubes in order to determine degradation cause(s) and consequently, applying required modifications to prevent subsequent degradations are of importance role[5-8].

Boiler – Fundamentals and Best Practices

Boiler - Fundamentals Steam production and steam uses Steam purity and steam quality Types of boilers Basic boiler principles Basic boiler calculations. Caustic Gouging. Acid Corrosion Acid Corrosion. Effective Internal Boiler Water Treatment Controls • Deposition • Corrosion • Carryover.

07451 Caustic Gouging in a Refinery Boiler - Root Cause

Characteristics of Water-Side Deposits in Boiler Tubes

How Repeat Situations Lead to Chemistry-Related Damage in

Boiler tube failures (BTFs) and heat recovery steam gen-erator (HRSG) tube failures (HTFs) serve well to illustrate the point as they represent, overall, the most prevalent cause of forced outages across the industry. However, some units experience very few chemistry-related tube fail-ures while in others they happen frequently and are often

[PDF] Corrosion of Boiler Tubes in a Palm Oil Mill

Aug 15, 2012 · This article investigates the leaking of tubes in a water tube boiler used in a palm oil mill. Leakages were discovered in the roof tubes and the rear wall tubes of the boiler. Samples of the punctured tubes were removed for examination. Microand macro-examinations were conducted to determine the causes of failure. EDX/ SEM (energy dispersive X-ray …

Boiler – Fundamentals and Best Practices

Boiler Tube Failure Investigation - TCR Advanced

Metallurgical root-cause investigation helps narrow down the reasons for failure and provides inputs to take the right corrective action. TCR has extensive experience in undertaking complex failures of boiler tube, turbine shaft & blades and has helped many power plants and utility boiler users to solve their problems.

What causes failure of boiler tube? - FindAnyAnswer.com

Apr 18, 2020 · Erosion is a process of wear in which materials are removed from a solid surface by the action of solid particles impinging on it. Fly ash erosion is the second most important cause for boiler tube failure (DOE, 1998). Tube failures by erosion in some cases account for about one-third of all tube failures in a boiler.

07453 A NEW UNDERSTANDING FOR THE MECHANISM OF CAUSTIC …

Gouging of boiler tubes has been commonly attributed to the dissolution of a protective magnetite film due to caustic attack, followed by precipitation of a non-protective magnetite scale. Furthermore, copper and nickel compounds were assumed to preferentially precipitate in the gouged area and to enhance the corrosion process.

Caustic Gouging - Structural Integrity Materials Services

Characteristics of Water-Side Deposits in Boiler Tubes

Caustic corrosion in a boiler waterside tube: Root cause

Mar 11, 2007 · Metallurgical analysis determined the mode of failure to be caustic corrosion. Further investigation concluded that the physical root cause was localized higher heat flux due to the operation of low NO x burners installed in 1996. PROCESS DESCRIPTION 37 Boiler - 300,000 #/hr 38 Boiler - 300,000 #/hr 39 Boiler - 300,000 #/hr 40 Boiler - 400,000 #Ihr

Acid Phosphate Corrosion - Structural Integrity Materials

Root Causes. Acid Phosphate Corrosion occurs where high levels of deposits are present and an acidic phosphate compound is used as part of the boiler water or evaporator water treatment program. Poor feedwater treatment often results in high corrosion product levels. Deposits are most often the result of corrosion or flow-accelerated corrosion

Water Handbook - Boiler System Failures | SUEZ

The application of a fast-acting oxygen scavenger, such as catalyzed sodium sulfite, also helps protect this vital part of the boiler. While oxygen pitting is the most common form of waterside corrosion that causes economizer tube failures, caustic soda has occasionally accumulated under deposits and caused caustic gouging.

Identifying Hydrogen Damage In - Thielsch Engineering

Jan 24, 2018 · Furnace waterwall tube failures represent a leading cause of forced outages in power boilers. These failures occur as a result of a variety of causes, including under deposit corrosion, overheating, erosion, wastage, graphitization, and fatigue. Under deposit corrosion mechanisms such as hydrogen damage and caustic gauging are often the most difficult …

Gas Steam Boiler Failure Analysis

Finding the Root Cause of Boiler Tube Failures. The following boiler tube failure mechanisms are some of the most common that caustic gouging along the top of a sloped tube is associated with steam-water Causes: Fuel ash corrosion is a …

Analisa Profil Kerusakan Tube Boiler PLTU (1 of 2) - sea

Nov 06, 2020 · Caustic Gouging/Caustic Attack/Caustic Embritllement/Ductile Gouging Failure ini lebih disebabkan karena tingkat alkalinitas yang tinggi (pH basa kuat >12) pada boiler water . Keberadaan caustic ini bisa disebabkan karena berlebihnya penggunaan soda caustic (NaOH) atau berlebihnya NaOH produk hasil reaksi antara caustic phospate ( Na 3 PO 4

Feed Water Chemistry-Related Corrosion Failures in

Aug 05, 2016 · Chattoraj analyzed the root cause for vertical furnace wall tube failures of a cogeneration boiler and discussed the mechanism of tube failure due to acid attack. Imran [ 7 ] pointed out on the effect of corrosion on heat transfer surfaces through boiler tube and estimates amount of extra-heat supplied as overheating in varying corrosion

How to Alleviate Waterside Issues in Boilers and HRSGs

Feb 01, 2019 · Caustic treatment is typically used in LP boilers. Chelant-based treatment is used in boilers operating below 1,000 psig. Excess chelant …

Boiler system pH/phosphate program control method - NALCO

Aug 22, 1994 · Film boiling, the second primary cause of caustic gouging, occurs when the heat input (heat flux) to a given section of boiler tube surface is so high that an orderly transfer of the heat from the tube surface to the steam-water mixture does not take place, leading to the formation of highly concentrated, nonboiling liquid films.

Caustic Gouging - Structural Integrity Materials Services

Caustic corrosion in a boiler waterside tube: Root cause

Critical Analysis & Prevention of Boiler Pressure Parts

I. INTRODUCTION TO BOILER TUBE FAILURES : The Route to Boiler Tube Failure (From Root Cause to Failure) Difference between Damage Mechanisms and Root Cause ; Analytical approach to identify conditions that may lead to Tube failure. Various adverse conditions in Boiler system leading to overheating, stress and corrosion ; II.

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Boiler, Gas oil boiler, Wood boiler, Thermal Oil Heater, Hot Air … All Products. The SZL Water Tube Coal steam Boiler can be used for the following business:Chemical plant,Textile plant,Food & Beverage,Garment manufacturing,Paper Plant,Printing and dyeing mill,Cement Plant,Fertilizer plant,Feed mills,Rubber factory. 1 Ton Oil Gas Fired Steam-Boiler advanced three pass wet …

Caustic corrosion in a boiler waterside tube: Root cause

Under-deposit corrosion is a common mode of failure in boiler tubes. Mechanisms include phosphate attack, caustic gouging, hydrogen damage, and wall thinning due to metal loss. Many aspects of these mechanisms and their mitigation are well-understood, while certain specific details remain uncertain or subject to controversy.

Engineer's Guide to Boiler Tube Inspections | Engineering360

Nov 08, 2016 · Comprehensive boiler evaluations are required to accurately identify the mechanisms and root causes of failure, assess conditions for continued operation, and estimate the necessity of future component replacements. caustic gouging, hydrogen embrittlement, and corrosion fatigue among the inside diameter. It does, however, require

Caustic corrosion in a boiler waterside tube: Root cause

Caustic corrosion, also known as caustic attack or caustic gouging, is one of the most common causes of boiler tube failures [4] . In boiler tubes, generally due to evaporation, caustics

Critical Analysis & Prevention of Boiler Pressure Parts

Boiler pressure parts failures are the leading cause of steam plant non-reliability. A tube failure may cause a forced outage, usually at the most inappropriate time, resulting lost production and lost revenue. But the tubes don't just fail suddenly. In 99.99% cases, an imminent tube failure would start giving indication long before it happens.

Caustic Gouging in a Refinery Boiler - Root Cause and