Safe Confined Area Access - Ventilation

Dehumidification, temperature control and ventilation services for comfortable working condition inside confined space

Safe Confined Area Access - Ventilation

What is a confined space?

Confined space means any place like tanks, columns, spheres, boilers, drums, chimneys, pipelines, cyclones, dust catchers, scrubbers, sulphur pits, ESP areas, kiln and other similar spaces, by virtue of its enclosed nature.




In confined areas, during maintenance and repair jobs like welding, fabrication, riveting job, strip lining, nozzle replacement, trays replacement are carried out, as a result, the air inside the confined areas becomes unhealthy and hazardous. Due to maintenance work and the presence of many people inside the confined area, the temperature increases to high levels approx. 48-500C with high relative humidity.

Also, the inherent danger of working in a confined space environment include:

  • Toxic, flammable, or explosive atmospheres
  • Harmful gas, fume, or vapour
  • Lack of oxygen
  • Excessively high temperature
  • Chemical exposures due to skin contact or ingestion as well as inhalation of ‘bad’ air.
  • Physical hazards – noise, heat/cold, radiation, vibration, electrical, and inadequate lighting.
With the depletion of oxygen in the air and more toxic fumes, it becomes difficult for workers to work inside the confined areas for a long duration. Consequently, they have to take breaks in regular intervals. Thus, the competence of the worker is affected, resulting in delays in the completion of the job and project. Also, toxic and flammable gases are injurious to the health of workers, engineers & the inspection team.


  • The temperature of the confined area should be between 32º – 35ºC
  • The relative humidity inside the confined area should be below 60%
  • Replenish oxygen at the correct amount of air change
  • Purging out toxic gases and replacing it with treated fresh air at the correct amount of air change

Our Solution

TDS provides customized dehumidification and temperature control systems to create the perfect working conditions inside the confined areas. Our package includes dehumidifiers, condensing units, blowers, and ducts backed by technical manpower to maintain the required relative humidity and temperatures inside the confined areas.

Desiccant based dehumidifiers adsorb the excess moisture from the air and maintain RH below 60%. At the same time, the condensing units help in maintaining the temperature between 25º-26ºC.


  • Improvement in productivity of the workers
  • Shutdown period is not extended hence reduced revenue loss
  • Timely completion of projects
  • Reduction of shutdown time resulting in tangible cost benefit
  • Health of the workers, inspectors, maintenance department, engineers is not affected.

Application based solutions for

Key Installations

bpcl mumbai - ventilation

BPCL, Mumbai

iocl panipat - ventilation

IOCL, Panipat

ril jamanagar - ventilation

RIL, Jamanagar

ventilation inside columns nfcl - ventilation
NFCL, Kakinada, Andhra Pradesh

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