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what is the side effect excessive phosphate in high pressure boiler

  • WATER TREATMENT - marineengineering.co.za

    2019-1-4 · In cooling systems this may be caused by excessive use of water treatment, causing highly alkaline conditions. In boilers, the source of this corrosion is excessive use of hydrazine, or leaking internal de-super-heater elements in boiler drums, which allow alkaline boiler water to enter the de-super-heater steam system and corrode copper

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  • Full text of "IS 10496: Specification for Feed Water

    Full text of "IS 10496: Specification for Feed Water, Boiler Water and Condensate for High Pressure Boilers" See other formats ***** Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency

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  • An overview of problems and solutions for

    A boiler is a closed vessel producing heat by the combustion of fuel which is transferred to water for its conversion into steam at desired temperature and pressure [].They are vastly used in power plants, paper industry, chemical industries, water treatment plants, textile

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  • Boiler feedwater - Wikipedia

    2019-9-7 · Boiler feedwater is an essential part of boiler operations. The feed water is put into the steam drum from a feed pump. In the steam drum the feed water is then turned into steam from the heat. After the steam is used it is then dumped to the main condenser.

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  • Introduction to Boiler water and Steam raising

    2013-2-13 · A boiler is a closed vessel in which water under pressure is transformed into steam by the application of heat. In the boiler furnace, the chemical energy in the fuel is converted into heat, and it is the function of the boiler to transfer this heat to the contained water in the most efficient manner.

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  • Analysis of Erosion formation in Boiler Tube Using CFD -

    2017-4-6 · Analysis of Erosion formation in Boiler Tube Using CFD Thurai SaiSharath, Maloth Heeralal, and Guguloth Ravi This effect, termed "phosphate hideout," usually occurs when loads increase. When the load is reduced, phosphate and high-pressure boiler

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  • Steam Generation Chemistry: Correcting Outdated

    2015-12-2 · Hydrazine residuals were typically maintained at relatively low levels of perhaps 20 to 100 ppb. Oxygen scavenger treatment was coupled with feed of

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  • Boiler Waterwall Tubes and Condenser Tube Leakage

    Tube failures are a cause of concern in boiler outage, contaminating boiler feed water due to condenser leakage leads to a large amount of damage. Condensers using brackish water for cooling in high pressure boilers will have to be maintained well to avoid any leakage of condenser tubes. Any leakage of condenser cooling water to the condensate leads to low pH levels in boiler water, which can

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  • Boiler Tube Failures - eecpowerindia.com

    2013-12-6 · Boiler Pressure Component Failure Mechanisms 9/4/2013 Steag O&M Company 12 The boiler tubes are under high pressure and/or high-temperature conditions. They are subject to potential degradation by a variety of mechanical and thermal stresses and environmental attack on

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  • Marine Steam Boiler Water Test Procedures,

    In steamships boiler feed water consists of condensate returns along with make-up feed water. The testing of boiler feed water is imperative to prevent many conditions which are detrimental to safe, efficient boiler steaming. These main culprits are high acid and oxygen content causing corrosion and pitting inside the water tubes and boiler internals.

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  • Study The Causes of Failure of Furnace Wall Tube In

    The reoccurrence of tube rupture in the furnace wall tubes in high pressure boiler 6 (127 kg/cm2,540 0C) – Najibiya power station –Basra-Iraq led to frequent shutdowns.In general,tube failure can occurr from improper operation including improper maintenance ( Ford,2004). It is possible for boiler tube to fail for a variety of reasons such as

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  • EC: Lesson 11. Scale and sludge formation in boilers

    In high pressure boilers, Na 2 CO 3 decomposes to give sodium hydroxide and carbon dioxide, Na 2 CO 3 + H 2 O → 2NaOH + CO 2. and this makes the boiler water basic ["caustic"]. The NaOH containing water flows into the minute hair-cracks, always present in the inner side of boiler, by capillary action.

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  • The effect of residence time or cycles of concentration are, at a given pressure, stability decreases phosphate, a relatively harmless boiler constituent. The which result in imbalance and excessive wear of high-speed machines and loss of efficiency in low speed

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  • Phosphate induced stress corrosion cracking in a

    Phosphate induced stress corrosion cracking in a waterwall tube from a coal fired boiler Phosphate corrosion in high-pressure boilers orthophosphates to maintain a boiler water sodium-to

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  • Phosphate Treatment - an overview | ScienceDirect

    The phosphate treatment was shifted to all volatile treatments (AVT) by replacing all copper bearing materials in the secondary side. Denting stopped with high AVT chemistry. Further improvements of secondary side water chemistry were done by maintaining condenser integrity that avoids impurity and oxygen ingression.

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  • Excess phosphate test Archives - Marine Engineering

    (Excessive density leads to priming and or deposits) To remove dissolved and suspended solid by blowing down. Hardness test. To check for salt causing "hardness" Note: Hardness test of boiler water are not necessary when the phosphate is above the lower limit of the control range. What are the advantages of boiler water treatment ?

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  • How to Alleviate Waterside Issues in Boilers and HRSGs

    2019-9-3 · Cycling units and boilers with substantial waterside deposits must operate with reduced phosphate levels to avoid excessive hideout. high-pressure boilers. boiler that operated with a

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  • 2/18/2014 - Home | The Association of Water Technologies

    2/18/2014 1 BOILER WATER – Deareators use head pressure (1 psi for every 2.3 feet of height above the pump), where a feed water tank is barely 3 feet above – With low temperatures and high oxygen content, the corrosion rate on carbon steel can be excessive.

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  • DRAFT BOILER/FEEDWATER GUIDELINES

    2017-3-20 · The National Board of Boiler and Pressure Vessel Inspectors 1055 Crupper Avenue Columbus, Ohio 43229 614.888.8320 iron and steel components are caused by excessive oxygen in the boiler/feedwater. Phosphate - a generic term for any compound containing a phosphate group.

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  • (PDF) Impact of Boiler Water Chemistry on Waterside

    This paper emphasis on the study of typical premature failure of water wall tubes of two thermal power plant boiler of same capacity (250 MW) and same operational parameter but with different boiler water chemistry. The investigation concludes on the

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