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Alkalinity builder based on sodium hydroxide (20%) from Accepta. Accepta 1020 is a high quality, concentrated solution of sodium hydroxide (20%) in water. It is a concentrated alkalinity builder and is used for controlling or increasing the pH or alkalinity of water in boilers, cooling systems and effluent streams
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May 02, 2000 · all dissolved solids for higher-pressure boilers that have tighter restrictions on boiler chemistry. Positively charged ions (cations) such as sodium, calcium, magnesium, and iron are exchanged for hydrogen ions, and negatively charged ions (anions) such as chloride, sulfate, carbonate, and silica are exchanged by hydroxide ions. Instead of salt,
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Boiler water treatment. Alkalinity. Treatment For pressures below 20 bar dissolved O2 in the feed does not cause any serious problems so long as the water is kept alkaline However cold feed should be avoided as this introduces large amounts of dissolved O2 are present, for pressures greater than 18.5 bar a dearator is recommended. Feed Treatment Chemicals
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WATER. Lecture-3. Water for industrial use Scale & Sludge Water for industrial use In most of the industries, water is used for production of steam. This water should be free from dissolved Ca and Mg salts. Such water is called BOILER FEED WATER. If boiler water contains impurities beyond prescribed limit, they lead to following problems Scale and sludge formation in boiler Boiler …
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Feb 14, 2020 · Sodium hydroxide (caustic soda) prevents scaling when added to the boiler water. The presence of alkali in the crevices, found around the rivet heads and other hot spots, combined with fabrication stress around rivet holes, causes cracks in the steel boiler shells and tube plates.
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This program was developed to prevent free caustic in boiler water during concentrating conditions At sodium:phosphate ratio of 2.85 in boiler water, precipitated solids have same concentration Safe range is between ratio 2.3 - 2.6 Control is based on pH and PO4 values Tri-Ad Programs. Boiler water contains low level of caustic soda
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•- Sodium is present in the steam in corrosive forms of NaCl and NaOH and are two major corrodents of the turbine, •- Can lead to stress corrosion cracking of turbine blades and stainless steel superheater tubes, and •- Sodium hydroxide has in …
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Alkalinity builder based on sodium hydroxide (47%) from Accepta. Accepta 1047 is a high quality, very concentrated solution of sodium hydroxide (47%) in water. It is one of the most concentrated alkalinity builders and is used for controlling or increasing the pH or alkalinity of water in boilers, cooling systems and effluent streams
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Hydroxide alkalinity in boiler water may come from a variety of sources. It may be added directly in the form of caustic soda (sodium hydroxide). When soda ash is fed as a water . 6000 Susquehanna Plaza York, PA 17406 800-297-8266. Page 2
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Poly (acrylic acid- co -hypophosphite), sodium salt (CAS Reg. No. 7Kefid), produced from a 4:1 to a 16:1 mixture by weight of acrylic acid and sodium hypophosphite. Total not to exceed 1.5 parts per million in boiler feed water. Copolymer contains not more than 0.5 percent by weight of acrylic acid monomer (dry weight basis).
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Sodium sulfite. 3 lb of sodium sulfite and 3 lb of caustic soda should be added per 1000 gal of water contained in the boiler (minimum 400 ppm P-alkalinity as CaCO3 and 200 ppm sulfite as SO3). Hydrazine. 5 lb of a 35% solution of hydrazine and 0.1 lb of ammonia or 2-3 lb of a 40% solution of neutralizing amine can be added per 1000 gal
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BASIC WATER TREATMENT OF STEAM BOILERS
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Jan 25, 2010 · The boiler water sample must be neutralized to avoid excess conductivity measurement from hydroxide ions or alkaline salts. PHOSPHATE: Tested to ensure that the treament is being dosed in sufficient quantities to react with incoming hardness and provide a safety reserve. The boiler water sample should be filtered before testing.
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This program was developed to prevent free caustic in boiler water during concentrating conditions At sodium:phosphate ratio of 2.85 in boiler water, precipitated solids have same concentration Safe range is between ratio 2.3 - 2.6 Control is based on pH and PO4 values Tri-Ad Programs. Boiler water contains low level of caustic soda
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Sodium + Water + Calcium = Calcium + Sodium Carbonate Oxide Carbonate Hydroxide Figure 1 Shows the flowsheet in the form of a block diagram. CHEMICALS IN THE RECAUSTICIZING PLANT Sodium Carbonate (Na2CO3) - This is the main constituent of the smelt generated in the recovery boiler. Dissolving the
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Boiler Water Treatment | Sodium Chloride | Sodium Hydroxide
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Boiler Water Treatment | Sodium Chloride | Sodium Hydroxide
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Sodium nitrate inhibits embrittlement at low concentrations ranging to 0.4 part of sodium nitrate per part of caustic soda in boiler water. Maintaining an organic content of 50-100 ppm and a sodium nitrate content of 50 ppm is a commonly used embrittlement prevention program.
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Boiler Water Treatment | Sodium Chloride | Sodium Hydroxide
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Mar 01, 1999 · High concentrations of sodium phosphate and sodium hydroxide were used for conditioning drum boilers in the 1950`s. However, corrosion occurred in the new high pressure plant, due to hydrogen damage and caustic gouging. This led to sodium hydroxide being abandoned in the USA in favour of phosphate treatment (PT).
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Description. Accepta 1025 is a high quality concentrated sodium hydroxide (caustic soda) solution available at 25% for use in the treatment of boiler feedwaters. Accepta 1025 can also be used to regenerate anionic resins in deionisation plants. It can also be used for most neutralisation processes where the pH must be raised.
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Aug 02, 2015 · The amount of sodium hydroxide required for 100 pounds of phosphate is 78.4 lbs (for sodium hexa meta phosphate) So sodium hydroxide needed for 7.81 lbs on phosphate is 7.81 x 78.4/100 = 6.12 lbs of sodium hydroxide. Example 9 A boiler 450psig requires 9.74lbs per day of anhydrous disodium phosphate to replace loss in blow down.
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WATER. Lecture-3. Water for industrial use Scale & Sludge Water for industrial use In most of the industries, water is used for production of steam. This water should be free from dissolved Ca and Mg salts. Such water is called BOILER FEED WATER. If boiler water contains impurities beyond prescribed limit, they lead to following problems Scale and sludge formation in boiler Boiler …
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Sodium nitrate is the standard treatment for inhibiting embrittlement in boilers operating at low pressures. The ratios of sodium nitrate to sodium hydroxide in the boiler water
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Porous deposits provide conditions that promote high concentrations of boiler water solids, such as sodium hydroxide (NaOH). X. Figure 12-14. Experimental boiler heat transfer suraces (800X magnifications) exposed to feedwater iron contamination. Heavy iron oxide deposition occurred (left) when no polymer was used.
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Prepare the boiler for firing as per O&M instructions, start the boiler water circulating pumps and fire the boiler at a slow rate. Raise the drum pressure to 40 kg / cm2 and hold it for 24 hrs and maintain a residual hydrazine content of 25 ppm & a solution pH 10.0 in the feed water being fed into the boiler during the entire passivation
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sodium hydroxide to increase boilers water pH as shown in equation (1). 3 4 2 + → 2 4 + Na PO H O Na HPO NaOH (1) To prevent formation of free sodium hydroxide the pH and phosphate concentration have to be kept below the line corresponds to Na/PO4 ratio of 3.0 found in pure tri-sodium phosphate as shown in fig. 1.
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Alkalinity builder based on sodium hydroxide (47%) from Accepta. Accepta 1047 is a high quality, very concentrated solution of sodium hydroxide (47%) in water. It is one of the most concentrated alkalinity builders and is used for controlling or increasing the pH or alkalinity of water in boilers, cooling systems and effluent streams
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Jan 01, 1995 · Abstract. The project is to review the international experience of using sodium chemically conditioning drum-type boilers; To determine how the EPRI guidelines might be extended to cover this type of treatment for plants in the United States.
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2/18/2014 3 Cheat Sheet - Reactions • Bicarbonate Break: Na 2 HCO 3 + HEAT Na 2 CO 3 + CO 2 + H 2 O • Developed Alkalinity: Na 2 CO 3 + HEAT + 2H 2 O 2NaOH + CO 2 + H 2 O • Brining Reactions: CaCl + Boiler Water CaSO 4 + CaSiO 3 • Phosphate Reactions: …
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Sodium Hydroxide Alkalinity Builder for Boilers – 6302. Sodium Hydroxide Alkalinity Builder for Boilers – 6302 . Available as cases of 4 x 5.54kg jars. Can be dosed using an Accepta Ultra Dissolver Board. Description below. Description Additional information Description.
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Oct 15, 2017 · These remained salts of sodium hydroxide or caustic soda react and dissolve the protective magnetite layer (Fe 3 O 4), eventually causing further metal loss from inside the boiler shell and finally equipment failure. Some precautionary measures to control caustic corrosion include: Controlling the pH values of boiler feedwater.
Get PriceInferred pH is possible only in caustic-based boiler treatments. Sodium hydroxide is a strong base. It dissociates completely in water according to the equation: NaOH(s) → Na+ + OH-As the equation shows, adding sodium hydroxide to water changes both the pH and the conductivity. Figure 3 shows the relationship
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Sodium •SODIUM –The sodium in steam can come from the boiler water chemicals as sodium phosphate (phosphate chemistry program) or from the pH/alkalinity contributed by sodium hydroxide in the chemistry program or both. •A good value for the sodium in the steam is < 5 ppb for phosphate chemistry programs.
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Apr 29, 2020 · The sodium hydroxide forms local concentrations nearly coming out of solution and forming thin film close to the heating surface. This breaks down the magnetite layer and then reacts with the steel to produce a soluble compound which then deposits on the surface in the form of a layer of loose porous oxide.
Get PriceCommission Cleaning Chemical Cleaning of Boilers Alkaline boil-out : lubricants, oil, rust, sand, metal fragments and assorted debris Experience has shown that an effective boil-out for a drum-type boiler can be attained by any of the following combinations : 1) Sodium hydroxide 2,000 ppm Sodium carbonate or sodium phosphate 2,000 ppm 2) Sodium
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Cracking and embrittlement are caused by too high a concentration of sodium hydroxide. Older riveted boilers are more susceptible to this kind of attack; however, care is still necessary on modern welded boilers at the tube ends.kind of attack; however, care is still necessary on modern welded boilers at the tube ends.
Get PriceExcessive Alkalinity Sodium hydroxide (caustic soda), used to eliminate acidity in boiler water, can cause a phenomenon known as caustic embrittlement. High concentrations of sodium hydroxide and high residual stress in the boiler material can combine to …
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Sodium Hydroxide – NaOH or Caustic Soda, or Soda Ash – used to maintain boiler water pH in the 10.0 – 11.5 range. Hydroxide increase boiler alkalinity to prevent acidic corrosion. If heavy scale is present, caustic soda can accumulate to cause Caustic Attack. See pH Treatment
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WATER. Lecture-3. Water for industrial use Scale & Sludge Water for industrial use In most of the industries, water is used for production of steam. This water should be free from dissolved Ca and Mg salts. Such water is called BOILER FEED WATER. If boiler water contains impurities beyond prescribed limit, they lead to following problems Scale and sludge formation in boiler Boiler …
Get Price
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