Caustic Corrosion - an overview | ScienceDirect Topics

Feb 10, 2011 · Caustic corrosion develops from deposition of feed water corrosion products in which NaOH can concentrate to high PH levels. At high PH level, the tube steel's protective magnetic oxide coating is solubilized and rapid corrosion occurs as per the reaction given below: 4 NaOH + F e 3 O 4 = 2 NaFeO 2 + 2 H 2 O. With the destruction of protective

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Boiler Water Treatment - AWT

Additionally, feed water is typically alkalized to a pH of 9.0 or higher, to reduce oxidation and to support the formation of a stable layer of magnetite on the water-side surface of the boiler, protecting the material underneath from further corrosion.

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Boiler feedwater - Wikipedia

If the ph of a boiler feed water is at a range of 8.5-9.5 and a boiler drum water's normal ph range is 9.8 to 10.6, why is the normal range of the ph of the boiler drum water more basic than that of the feed water?

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Boiler Water Tests | Viking Water Technology, Inc.

May 04, 2016 · Boiler pH should be kept between 10.5 and 12.5. Below 10.5, there is insufficient protection from corrosion and hardness compounds are not precipitated in the desired, free-flowing form. Above 12.5 there is the possibility of caustic embrittlement and carryover. Condensate pH should be kept between 8.0 and 8.6.

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DRAFT BOILER/FEEDWATER GUIDELINES

A common recommendation is to maintain boiler water at 8.5 pH. Acidic water is corrosive. Alkalinic water is more prone to scaling. Alkalinity is a measure of the bicarbonate (HCO3), carbonate (CO3) and hydroxyl (OH) ions in the water. pH and alkalinity ratings are NOT the same and are NOT proportional. pH is rated on the Scale and alkalinity is measured in parts per million (ppm).

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Feed Water Treatment to Avoid Corrosion

Related Topics . Steam and Condensate - Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more; Related Documents . Air Solubility in Water - Amount of air that can be dissolved in water - decreases with temperature and increases with pressure; Boiler Blowdown - Suspended solids in the feed water will remain in the boiler when steam is generated

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Boiler Water Treatment Part 2 – Internal Treatment

Generally it is desirable to have a slightly high pH for boiler feed water. Ideally the feed water should be in the range of pH 8.5 – 9.5. This ensures that free carbon dioxide within the system becomes 'fixed'. If copper fed lines or heaters are used, restrict the feed water pH to a maximum of 9.2.

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High-Purity Boiler Water pH Measurement - POWER Mag

Mar 01, 2019 · Like virtually all power companies, the utility treats its high-purity boiler water to a pH between 8.5 and 9. For many years the company used a specialized high-purity water sensor to measure the pH.

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Scaling in boilers - Lenntech

In general, boiler deposits can cut operating efficiency, produce boiler damage, cause unscheduled boiler outages, and increase cleaning expense. The first anti-scaling preventative measure is to supply good quality demineralised water as make–up feed water. The purer the feed water is, the weaker the driving mechanism to form scale.

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The importance of pH in steam-boiler water

Boiler Water Treatment Guidelines; Columbia Boiler Co

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If the ph of a boiler feed water is at a range of 8.5-9.5

Feb 01, 2016 · The safe pH range for steam boilers is between 8.5pH & 12.7pH, whilst the recommended level is between 10.5pH & 12.0pH. Boiler water with a pH of …

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Inferred pH in Steam Plant Water Chemistry Monitoring

Inferred pH means pH calculated from straight and cation conductivity. The calculation can be applied to condensate, feedwater, and boiler water. Although not widely used in the United States, inferred pH is popular in Europe. Some plant chemists find inferred pH useful because it …

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Inexplicable pH drop in boiler blowdown water

Jan 27, 2013 · I am working in a boiler (17.5 Kg/Cm square) where boiler feed water pH is 8.5 but boiler blowdown pH is dropped to 7.5-8.0. My question is if boiler feed water pH is ok then what cause can be responsible to drop the pH of blow down. Ajit Mondal chemical engineer - Haldia, India

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Steam Boiler Water pH Control - Controls 4 Steam

For effective, economic boiler operation, close control of the boiler water pH is a necessity whichever way you do the maths. The safe pH range for steam boilers is between 8.5pH & 12.7pH, whilst the recommended level is between 10.5pH & 12.0pH. Boiler water with a pH of 10.5 contributes 12.6mg/l towards the boiler TDS, whilst at a pH of 12.0

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Shrimp Farm Technical Guidlines - Mahesh Aqua Holdings

If pH fluctuation is large during the day (> 0.5), hardness (the amount of CaCO3) in ponds is low, algae grows and develop quickly causing algal blooms, organic detritus increases in ponds, use dolimite lime with a dose of 100-200 kg/ha to increase water hardness and buffering agent. Water should also be changed to stabilize the growth of algae.

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What will happen if pH value increases in a boiler? - Quora

Inferred pH means pH calculated from straight and cation conductivity. The calculation can be applied to condensate, feedwater, and boiler water. Although not widely used in the United States, inferred pH is popular in Europe.

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Inferred pH in Steam Plant Water Chemistry Monitoring

Jun 24, 2014 · It comes into play with steam boilers because a pH between 7 and 9 (slightly alkaline) is just right. If the pH is lower than that, the water will start eating the pipes. If it's higher than that, the water won't corrode metal, but it may begin to foam, and that's not good. Hold that thought for a moment.

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Critical HRSG | Power Engineering

Dec 22, 2016 · For example, in a 1000 psi boiler the recommended maximum drum water silica concentration is 2.3 ppm. In a 2,400 psi steam generator the recommended maximum is 0.22 ppm!

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Chemical Pretreatment For RO and NF - Hydranautics

Silica rejection and solubility are higher at elevated pH levels (particularly above pH 9). Boron rejection is higher at elevated pH levels (particularly above a pH of 9). One special process application, frequently referred to as the HERO TM process, implements a caustic feed to raise feed pH to 9 or 10.

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Boiler Water Treatment Guidelines; Columbia Boiler Co

the boiler water should be maintained at pH 11. This may require an addition of alkali if the water is not soft. Secondly, a chemical called a sludge conditioner can be added to treat the solids so that they drop out (precipitate). Finally, these treated solids must be removed from the boiler by blowoff.

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