Stack Emission Monitoring

Industrial stacks are the means by which industrial plants discharge their gaseous wastes into the atmosphere. These gaseous effluents may contain pollutants which may be organic or inorganic in chemical nature and be in may be solid, liquid, or gas in physical form.

Stack Monitoring is an instrumental method or procedure for evaluating the characteristics of the emissions from industrial waste gas streams discharged into the atmosphere. Effluent measurement procedures follow specific test methods and protocols to ensure representative and accurate emission data. Test methods are generally pollutant specific, sometimes industry specific. These test methods are formulated and recommended by a variety of regulatory and statutory authorities and jurisdictions such as USEPA, CPCB etc.

Particulate pollution determination is generally carried out by sampling systems. Gaseous pollution determination is carried out either by manual methods or by instrumental methods depending upon the gaseous pollutant of interest. Manual methods comprise sampling systems.

A typical sampling system, which is the commonest method for stack emission monitoring, comprises a ‘ Sampling probe ’, a Sample Collection Module, a Sampling Control Module and a sampling pump.

The sample collection medium and the method of sampling varies with the physical form of the sampled pollutant. In case of particulate pollutants, the collection medium is a filter paper and sampling is carried out under isokinetic flow conditions. Gaseous pollutants are sampled by manual methods or instrumental methods.

  • Condition of sampling under isokinetic conditions is not mandatory for sampling of gaseous pollutants.

  • Removal of moisture from the stack effluents before their entry into control module is mandatory.

  • Moisture removal device may be made a part of the gaseous sampling system or may be kept separate from it.

We design and manufacture products and systems which encompass all areas of emission monitoring

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