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CORROSION IN COOLING WATER SYSTEMS A foremost topic at the Effluent and Water Treatment Convention

CORROSION IN COOLING WATER SYSTEMS A foremost topic at the Effluent and Water Treatment Convention CORROSION IN COOLING WATER SYSTEMS A foremost topic at the Effluent and Wate r Treatment Convention th e conditions obtaining in the water Th e word polyelectrolytes bobbed up polyphosphate-organic inhibitors are thu s ubiquitously at Earls Court during the thought to be of great utility where contact surfaces of heat exchangers, the Convention sessions held from March 30 stream pollution problems preclude the authors mention the use of a high- temperature corrosion tester which to April 2. The thread-like nature of the use of Chromate inhibitors. provides for heat transfer through ionised molecules of these materials, I n another field test, where zinc corrosion specimens exposed to cooling and their other principal advantage of chromate-organic treatment was used in water. water-solubility, are finding more and a gasholder from which water was also more uses in clarifying, sedimenting, recirculated to compressor jackets for Thi s device circulates a hot fluid thickening, sludge filtration and de- cooling, corrosion rates of only 0.7-1.2 through specimens which are in the form watering operations. Polyacrylamides of mils/year were recorded. This treatment of U-tubes. Fluid temperature is auto­ M W 105-5 X 106 are among the more has been suggested for use with waters matically controlled and can be as high recent types used for controlling mud coagulated with alum, which contains as 400°F; exposure times are between and silt in cooling systems, the dosage traces of aluminium. 30-60 days, the water flow being being 0.05-200 p.p.m. regulated to match operating conditions, Finally, o n corrosion control by chemi­ while the fluid temperature is set at that cal additions, the authors mention the Th e latter fact is taken from an of the product side of th e heat exchanger. interesting paper by J. F. Wilkes and use of iron salts in brackish or polluted Herma n Kerst, which gave a general cooling water in non-ferrous tubes. A Thi s method has been employed in the survey of advances in the control of brief period of low-level dosage (1 U K to analyse the possibility of reclaim­ p.p.m. Fe) of ferrous sulphate is said to ing sewage effluent for cooling furnaces corrosion deposits and micro-organisms protect copper alloy surfaces for 24 hr., for a steel mill. In this application, the in cooling systems, and described some although the mechanism of this reaction, high-temperatur e tester showed that recent laboratory, pilot plant and full- scale work in the USA and the U K on which may involve iron sulphide film excessive scale deposits would not be corrosion control in this type of formation, is not fully understood. formed at the operating temperatures equipment. of the furnace doors, and the reclaimed water could therefore be used for cooling Cathodic protection and inhibitors purposes. Improved inhibition One significant set of results indicated After dealing with the control of scale the usefulness of a combined cathodic and organic fouling deposits formed A list of papers given at the protection/inhibitor system for water of during water evaporation, the authors moderate conductivity, i.e. where E. & W. T. Convention speak of a series of cooling tower tests cathodic protection has not usually been of chromate-polyphosphate corrosion 1. Advances in the Control of Corrosion, considered satisfactory. Deposits and Micro-organisms in inhibitors newly improved by the Serious pitting had occurred on steel Cooling Systems.—J. F. Wilkes and addition of non-ionic surfactants of high Herman Kerst. tub e sheets of Freon condensers in a molecular weight. The latter enhance 2. Polyelectrolytes: Aids to Effluent and large air-conditioning plant where heat th e effectiveness of the inhibitor and Water Treatment?—A. C. Benson and is removed by an open recirculating C. M. Thomas. improve scale control. cooling tower. In this plant copper 3. Distillation of Saline Water. — C. I n one petroleum plant using a condenser tubes project a little through Rhodes. chromate-polyphosphate treatment, with 4. Electrodeionisation—A New Method steel tube sheets; magnesium anodes for Producing High Quality Water.— Chromate residuals averaging 80 p.p.m., were installed in the water boxes of the P. H. Seaman. th e corrosion rate became as high as condensers and a sodium-zinc glassy 5. Electrodialysis.—G. S. Solt. 5 mils/year, but the addition of sur­ phosphate corrosion inhibitor was also 6. Deionisation Technique based upon factants reduced this by half, when Weak-electrolyt e Ion-exchange employed. Chromate residuals were kept below Resins.—B. Vassiliou. Total dissolved solids in the cooling 7. Biochemical Oxidation in Packed 50 p.p.m. Inspection of the heat water averaged about 2,200 p.p.m. and Towers.—T. G. Noble. exchanger showed that pitting and scale 8. Disposal of Industrial and Sewage th e electrical resistance of the water formation were being prevented by this Sludges.—V. H. Lewin. ranged from 1,450-2,150 ohm/cm. means, and improved protection was 9. Treatment and Recovery of Paper Mill Results showed that the steel tube sheets Effluents.—S. E. Punt and W. J. M. gained for copper and aluminium as well with copper tubing were protected Cook. as steel parts, both coupled and un­ 10. A Practical Look at Instrumentation for against pitting by this combination, but coupled. Effluent Treatment Plants.—M. A. for effective protection th e turbulent path Lock. Furthe r case histories were given, between anodes and tube sheet could not 11. Inorganic Effluent: Treatment or including one where both polyphosphate- exceed 12 in., protection being halved if Recovery?—P. A. L. Northcott. tannins and sodium-zinc polyphosphate- 12. Automatic Control of Pumping Instal­ th e spacing was increased to 18 in. organic treatment were used, on separate lations.—Ian M. E. Aitken and R.A.F. towers. The outcome here was more Craven. 13. The Administration of Trade Effluent High-temperature corrosion tester favourable for the metallic-organic com­ Control.—M. A. Kershaw. pound , steel strip specimens being I n pointing out that the usual corrosion 14. The Law Relating to Abstraction and markedly less corroded, and scale and test methods employed in treating Discharge of Underground Water.— slime deposits much lower. The zinc- A. S. Wisdom. cooling water systems do not duplicate May 1965 CORROSION TECHNOLOGY http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Anti-Corrosion Methods and Materials Emerald Publishing

CORROSION IN COOLING WATER SYSTEMS A foremost topic at the Effluent and Water Treatment Convention

Anti-Corrosion Methods and Materials , Volume 12 (5): 1 – May 1, 1965

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0003-5599
DOI
10.1108/eb044065
Publisher site
See Article on Publisher Site

Abstract

CORROSION IN COOLING WATER SYSTEMS A foremost topic at the Effluent and Wate r Treatment Convention th e conditions obtaining in the water Th e word polyelectrolytes bobbed up polyphosphate-organic inhibitors are thu s ubiquitously at Earls Court during the thought to be of great utility where contact surfaces of heat exchangers, the Convention sessions held from March 30 stream pollution problems preclude the authors mention the use of a high- temperature corrosion tester which to April 2. The thread-like nature of the use of Chromate inhibitors. provides for heat transfer through ionised molecules of these materials, I n another field test, where zinc corrosion specimens exposed to cooling and their other principal advantage of chromate-organic treatment was used in water. water-solubility, are finding more and a gasholder from which water was also more uses in clarifying, sedimenting, recirculated to compressor jackets for Thi s device circulates a hot fluid thickening, sludge filtration and de- cooling, corrosion rates of only 0.7-1.2 through specimens which are in the form watering operations. Polyacrylamides of mils/year were recorded. This treatment of U-tubes. Fluid temperature is auto­ M W 105-5 X 106 are among the more has been suggested for use with waters matically controlled and can be as high recent types used for controlling mud coagulated with alum, which contains as 400°F; exposure times are between and silt in cooling systems, the dosage traces of aluminium. 30-60 days, the water flow being being 0.05-200 p.p.m. regulated to match operating conditions, Finally, o n corrosion control by chemi­ while the fluid temperature is set at that cal additions, the authors mention the Th e latter fact is taken from an of the product side of th e heat exchanger. interesting paper by J. F. Wilkes and use of iron salts in brackish or polluted Herma n Kerst, which gave a general cooling water in non-ferrous tubes. A Thi s method has been employed in the survey of advances in the control of brief period of low-level dosage (1 U K to analyse the possibility of reclaim­ p.p.m. Fe) of ferrous sulphate is said to ing sewage effluent for cooling furnaces corrosion deposits and micro-organisms protect copper alloy surfaces for 24 hr., for a steel mill. In this application, the in cooling systems, and described some although the mechanism of this reaction, high-temperatur e tester showed that recent laboratory, pilot plant and full- scale work in the USA and the U K on which may involve iron sulphide film excessive scale deposits would not be corrosion control in this type of formation, is not fully understood. formed at the operating temperatures equipment. of the furnace doors, and the reclaimed water could therefore be used for cooling Cathodic protection and inhibitors purposes. Improved inhibition One significant set of results indicated After dealing with the control of scale the usefulness of a combined cathodic and organic fouling deposits formed A list of papers given at the protection/inhibitor system for water of during water evaporation, the authors moderate conductivity, i.e. where E. & W. T. Convention speak of a series of cooling tower tests cathodic protection has not usually been of chromate-polyphosphate corrosion 1. Advances in the Control of Corrosion, considered satisfactory. Deposits and Micro-organisms in inhibitors newly improved by the Serious pitting had occurred on steel Cooling Systems.—J. F. Wilkes and addition of non-ionic surfactants of high Herman Kerst. tub e sheets of Freon condensers in a molecular weight. The latter enhance 2. Polyelectrolytes: Aids to Effluent and large air-conditioning plant where heat th e effectiveness of the inhibitor and Water Treatment?—A. C. Benson and is removed by an open recirculating C. M. Thomas. improve scale control. cooling tower. In this plant copper 3. Distillation of Saline Water. — C. I n one petroleum plant using a condenser tubes project a little through Rhodes. chromate-polyphosphate treatment, with 4. Electrodeionisation—A New Method steel tube sheets; magnesium anodes for Producing High Quality Water.— Chromate residuals averaging 80 p.p.m., were installed in the water boxes of the P. H. Seaman. th e corrosion rate became as high as condensers and a sodium-zinc glassy 5. Electrodialysis.—G. S. Solt. 5 mils/year, but the addition of sur­ phosphate corrosion inhibitor was also 6. Deionisation Technique based upon factants reduced this by half, when Weak-electrolyt e Ion-exchange employed. Chromate residuals were kept below Resins.—B. Vassiliou. Total dissolved solids in the cooling 7. Biochemical Oxidation in Packed 50 p.p.m. Inspection of the heat water averaged about 2,200 p.p.m. and Towers.—T. G. Noble. exchanger showed that pitting and scale 8. Disposal of Industrial and Sewage th e electrical resistance of the water formation were being prevented by this Sludges.—V. H. Lewin. ranged from 1,450-2,150 ohm/cm. means, and improved protection was 9. Treatment and Recovery of Paper Mill Results showed that the steel tube sheets Effluents.—S. E. Punt and W. J. M. gained for copper and aluminium as well with copper tubing were protected Cook. as steel parts, both coupled and un­ 10. A Practical Look at Instrumentation for against pitting by this combination, but coupled. Effluent Treatment Plants.—M. A. for effective protection th e turbulent path Lock. Furthe r case histories were given, between anodes and tube sheet could not 11. Inorganic Effluent: Treatment or including one where both polyphosphate- exceed 12 in., protection being halved if Recovery?—P. A. L. Northcott. tannins and sodium-zinc polyphosphate- 12. Automatic Control of Pumping Instal­ th e spacing was increased to 18 in. organic treatment were used, on separate lations.—Ian M. E. Aitken and R.A.F. towers. The outcome here was more Craven. 13. The Administration of Trade Effluent High-temperature corrosion tester favourable for the metallic-organic com­ Control.—M. A. Kershaw. pound , steel strip specimens being I n pointing out that the usual corrosion 14. The Law Relating to Abstraction and markedly less corroded, and scale and test methods employed in treating Discharge of Underground Water.— slime deposits much lower. The zinc- A. S. Wisdom. cooling water systems do not duplicate May 1965 CORROSION TECHNOLOGY

Journal

Anti-Corrosion Methods and MaterialsEmerald Publishing

Published: May 1, 1965

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