sodium limit in boiler steam

sodium limit in boiler steam

  • The reaction of tri-sodium phosphate (Na3PO4) with water is shown below. Steam pegging from an auxiliary boiler or sister unit; permit language shows impurity limits with a ppb

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  • The solubility of silica in steam increases with increased temperature; therefore, silica becomes more soluble as steam is superheated. As steam is cooled by expansion through the turbine, silica solubility is reduced and deposits are formed, usually where the steam temperature is below that of the boiler water.

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  • xMedium pressure boilers, between about 300 and 900 psig, are the workhorses of industry. These boilers are designed in many different ways, either packaged or field-erected (section 3.0) They provide steam for heating, power generation, transportation and process uses in a wide variety of commercial, institutional and industrial facilities.

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  • The guidelines for water quality control of water/steam in boiler plants of 60 kg/cm 2 and above are furnished as recommended by many boiler designers. The feed water limits . For drum operating pressure kg/cm 2 (g) 61-100, 101-165, and 166-205 with PO 4 treatment type of boilers: Hardness, in ppm, has to be nil for all pressures.

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  • Another commonly used method for measuring steam purity is the sodium tracer technique. This technique is based on the fact that the ratio of total solids to sodium in the steam is the same as the ratio of total solids to sodium in the boiler water for all but the highest-pressure (greater than 2400 psig) boiler systems.

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  • a uniform mixture of sodium lignosulfo-nate, sodium hexametaphosphate, and anti-foam for use as a boiler water additive to control scale formation and to prevent steam contamination. the blend shall be suitable for use in the generation of steam for the process-ing of food, readily soluble in water, contain less than 0.5% insoluble matter,

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  • Managing boiler water chemistry plays a major role in avoiding several forms of boiler tube failure (BTF) be-cause of corrosion and related steam system damage. In the first part of this report, a case study will be pre-sented that detail the types of failures that can occur as a consequence of exceeding prescribed contaminant limits.

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  • Boiler carryover measurement. Steam purity can be measured with the use of a sodium ion analyzer. It measures the sodium ion content in a cooled steam sample that will correspond to the amount of boiler water solids contaminating the steam. The sodium ion analyzer can detect carryover down to 1 ppb sodium in steam. Affect of oil on carryover

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  • incoming saturated steam and lead to overheating of the metal on the fireside causing failure of superheater tubes – Silica from shore water makeup vaporizes with steam and deposits on tubes – Boiler water carryover with saturated steam causes internal sodium solids deposits – Iron oxide buildup indicates an iron-steam reaction

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  • BASIC WATER TREATMENT OF STEAM BOILERS Steve Kenny and Dave Pope Chemco Water Technology Vancouver, WA This is a brief discussion on low-pressure steam boiler chemistry. It provides dry kiln boiler operators the tools to maintain an efficient and effective boiler chemistry program.

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