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Steel Manufacturing

October 3, 2011


Steel is manufactured by smelting of iron ore in a blast furnace into pig iron. Many heat treating processes are applied during the process of steel manufacturing so the temperature in and around the manufactuing area remains quite high. Also toxic gases and fumes are produced as a result of the various hot jobs. In steel plants many pressure vessels like boilers, kilns, reactors, heat exchangers, columns etc finds wide application. These structures need regular maintenance for proper functioning so  blasting, coating, painting fabrication and other hot jobs are carried out.

But coating fails if the humidity in the surrounding is high. It has been observed that 60%-80% of coating failures occur due to improper surface preparation. High humidity causes condensation on the metal surface resulting in blooming or flash rust. During  fabrication temperature level rises to uncomfortable levels. Toxic gases too are produced which affects the health of the workers. This results in workers taking frequent breaks and brings down efficiency level. Also the temperature inside the vessels remains very high as a result of which maintenance team finds it difficult to enter for carrying out the job.

General Recommendation:

Relative humidity inside the vessel should be maintained at <55% and  temperature between 30ºC-35ºC.

TDS Solution:

Presence of moisture between substrate and the paint coat is the reason for  occurrence of corrosion. This results in coating and paint failure. To increase the life of coating moisture level needs to be controlled inside the tank. TDS provides desiccant based dehumidifiers along with other accessories and technical manpower to provide the desired humidity level. To overcome the high temperature level and affects of toxic gases TDS provides condensing units. The package of condensing units and blowers maintains the temperature between 30ºC ~ 35ºC and helps in purifying the air. This dehumidification service is provided on rental basis so it can be availed whenever the need arises.

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