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Perfect Pollucon Services

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Stack Emission Monitoring & Stack Emission Testing

Stack Emission monitoring is referred to as Stack emission testing, stack emission monitoring, stack sampling, Source Emission Monitoring or Source Testing. It is a process to measure the emission of industrial waste or pollutants emitted into the atmosphere. The pollutants emitted from the stack can be solid, gaseous, liquid organic or inorganic.

What is Stack?

The stack is nothing but chimney which is used to disperse the hot air at a great height, emissions & particulate matters that are emitted from the various types of stacks like boiler, flue gas etc. At these heights, the polluted air disperses in a very large area so that concentrations at the ground are within permissible limits and not harmful for humans, animals and vegetation.

Stack Emission Monitoring

There are several types of flue-gas stack based on fuel injections. Eg. DG set stack, flue gas stack, process stack, furnace stack, boiler stack, chimney etc.

CPCB guidelines for Stack Height

Chimney, Boiler, DG set, DG exhaust pipe etc. Stack height calculation plays an important role in determination of dispersion of pollutants in upper level of air relevant to local building height.

Chimney / Boiler/ Stack Height Calculation Formula

H = h + 0.2 *  âˆšKVA

Where,

H = Total height of stack in metre

h = Height of the building in metres where the generator set is installed

KVA = Total generator capacity of the set in KVA

Based on the above formula stack height to be provided can be categorized as follow: This is inline with CPCB guidelines for stack height.

Sr noFor Generator SetsTotal Height of stack in metre
150 KVAHt. of the building + 1.5 metre
250-100 KVAHt. of the building + 2.0 metre
3100-150 KVAHt. of the building + 2.5 metre
4150-200 KVAHt. of the building + 3.0 metre
5200-250 KVAHt. of the building + 3.5 metre
6250-300 KVAHt. of the building + 3.5 metre

Stack Emission Monitoring & Testing by Perfect Pollucon Services (Marathi)

This video explains why stack Emission testing or Source Emission Testing is important and how to carry out Industrial Stack Monitoring process.

Stack Emission Monitoring & Testing by Perfect Pollucon Services

What are the Requirements of Stack Emission Monitoring & Testing?

Perfect Pollucon Services is a stack emission testing company having more than 30 years of experienced experts. They know how to carry out these tasks in an efficient manner.

• To determine the quality and quantity of air pollutants emitted by the source
• To measure the effectiveness of pollutants controller equipment before and after installation
• To measure the effectiveness of pollutants controller equipment for a given condition
• To compare results with emission standards to take required action
• To compare changes in emission with the changes in processes or raw materials

Stack Monitoring Kit or Equipment

• Stack Monitoring kit used to find gaseous pollutants in emission from a stationary source such as Boiler Chimney, Process outlets, Scrubber outlets Etc by stack emission testing companies.
• It also can be used to determine physical parameters such as exit emission velocity from stack, temperature & flow of Air emission.
• Determination of total particulate matter using isokinetic Sampling Technique.
• Analysis of gaseous contaminants like SO2, SO3, NOx, Cl2, HCL, NH3 etc by using a gas monitoring system.

Stack emission monitoring Equipment is divided into Four Parts

Velocity Measuring Kit

Consist of the inclined manometer, Digital Temperature Indicator, ‘S’ type Pitot tube & thermocouple.

Particulate Sampling Train

Thimble Holder & set of nozzles, condenser, Rotameter, Dry Gas Meter, Time indicator & power source for synchronizing vacuum pump with sampling train.

Multigas Sampling Train

Consists of four glass impingers housed in FRP casing with Rotameter for gaseous sampling.

Vacuum pump

Diaphragm type vacuum pump of suitable capacity.

Stack Emission Monitoring & Testing Procedure

Measurements of these pollutants follow specific predefined stack emission testing procedures and protocols to ensure accurate and representative data of the total amount of pollutants emitted into the atmosphere from a given source in the given time is collected.

Stack Monitoring

Learn more about Stack Emission monitoring Methods

It is the most Important that sample collected must truly represent the conditions of flue gas stack. Accurate measurement of Pressure, moisture, humidity, gases, velocity, temperature and Particulate matter is required during Industrial stack monitoring procedure.
It is also required to measure accurately rate of flow gases accurate of weight and volume of samples collected.
Also When a wide range of particles are present in emission flow, there is a possibility that only smaller particles can enter into sampler inlet and larger particles may not enter due to their inertia. So to avoid this situation Calculating isokinetic ratio i.e. Isokinetic Stack Sampling method can be helpful to achieve accurate results in gas boiler emission monitoring.

IsoKinetic Stack Sampling

Read More about how to select traverse Point or Iso-kinetic Stack Sampling in Stack Monitoring.

Stack Emission Measurement Parameters

Collected Sample then tested and analysed in a laboratory for Parameters (Stack Emission Monitoring Parameters) NOx (Oxides of Nitrogen), CO2 (Carbon Dioxide), CO (carbon monoxide), SO2 (sulphur dioxide), VOC (Volatile Organic Compound) etc.

Stack Emission Monitoring Frequency

The frequency for stack monitoring is always directed in Consent to operate for depending on their industry type and plant capacity. Larger plants will have to monitor stack more frequently than small plants. For each industry, there is different frequencies are defined on CPCB website depending on their consent categories. They have covered industries like cement, thermal power, integrated iron and steel, fertilizer, Nitric acid, Sulphuric acid, Primary aluminium, Carbon black, Calcium carbide and Oil Refinery, etc.

What is The Limit of PM Emission For Stack Monitoring?

As per CPCB or Indian standards for Industrial Stack Monitoring the flue gas emission from boiler stack, DG set emissions, the furnace should not exceed the limit for Particulate matter beyond 150 mg/Nm3. However, this limit can vary depending on the industry type.

Read more about Fugitive Emission Monitoring and Testing

Stack Monitoring Parameters and Standards / Limits as per CPCB for Boiler & DG Sets Emission

Please refer below table of Stack Monitoring Parameters and Standards / Limits as per CPCB for Boiler & DG Sets Emission:

Sr no

Stack Monitoring Parameters for Boilers and DG Sets

Stack Monitoring Limits / Standards As per CPCB (in mg/Nm3)

1

Particulate Matter (PM)

150

2

Sulphur Dioxide (SO2)

40

3

Oxides of Nitrogen (NOx)

25

4

Total Fluoride (F)

25

5

Mercury (Hg)

0.2

6

Chlorine (Cl)

15

7

Hydrochloric Acid Vapor & Mist (HCl)

35

8

Sulphuric Acid Mist (H2SO4)

50

9

Carbon Monoxide (CO)

1%

10

Lead (Pb)

10

Also you can use our online Stack monitoring calculators to calculate Velocity head and Velocity of gaseous flow in Stack.

Recently, in Stack Emission Monitoring below mentioned two technologies introduced to measure online stack emission:

Piezoelectric Monitor – Industrial Stack Monitoring Equipment

In this equipment, particles are electrostatically deposited on to a piezoelectric sensor by stack emission testing companies.

Beta Attenuation Monitor – Industrial Stack Monitoring Equipment

In this equipment, the particulate sample is filtered using a continuous filter tape and the mass of particulates filtered out is determined by measuring its radiations.

Stack Emission Monitoring & Testing Services by our Company

Perfect Pollucon Services offer Stack emission testing and Source Emission monitoring services to keep a check on industrial waste stream that is released into the atmosphere.

Every industry or manufacturing company has to notify their stack emission levels to the pollution control board. We carry out various tests to determine pollutants concentrations, emission rate or parameter in the Gas Boiler emission monitoring process. We offer to test for benzene testing, toluene testing, heavy metal testing in air, VOC emission monitoring and VOC Testing and analysis.

We offer Environmental Services.

Frequently Asked Questions:

What is stack monitoring system?

Stack monitoring system used for detecting and measuring of harmful gases released into atmosphere from stack, chimneys, DG stacks, etc. Process involves sampling of gases from stack and monitor in real time to keep an eye on volume of gas emissions.

How is stack monitoring performed?

Stack Emission monitoring procedure includes tasks of Measurement, testing, sampling and analysis. Onsite determination of physical parameters of flue gases such as temperature, flow and pressure also involved in Stack emission monitoring.

What is stack monitoring in air pollution?

Stack Monitoring is the process of testing the harmful gases emitted from stacks to keep a check on the pollutants released in the air. The top pollutants that stacks emit are Carbon Monoxide(CO), Oxides of Sulphur (SO2,SO3),Methane Gas, and oxides of Nitrogen i.e. SOx and NOx, and hydrocarbon compounds

What is the stack emission?

Stack emission is basically gases released into the air from boiler stack, chimneys or DG set stack etc. from various industries after incineration process i.e. method to remove or burn the harmful gases before releasing to environment.

What is stack in air pollution?

Stacks are large chimneys designed to emit and disperse hot air, particulate matter, and pollutants from industries into the upper atmosphere so that they do not create a danger to life on the ground. There are several types of stacks in use today, such as: Boiler stacks. Flue gas stacks, etc.

What devices are used to measure stack emissions?

There are many types of devices used in Stack emissions based on the objective. Most commonly used devices are:
1) Iso-Kinetic Sampling: Manual and Automatic
2) Pollutant Specific: PM 2.5 and PM10, Sulfuric acid, Dioxin Furan, Halogens and Halides etc. measurement instrument
3) Specific Gas Sampling Instruments: NOx, SO2, VOC, Flue Gas Analyzers, Electrochemical Sensor based analyzers, etc.
4) Metal Emission Sampling Instruments
5) Specific Parameters: Pressure, Flow, Temperature, Velocity, Relative Humidity measurement instruments

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Perfect Pollucon Services is one of the leading Stack testing Company.

Read More about what we cover in environmental monitoring services?

32 thought on Stack Emission Monitoring & Stack Emission Testing

  1. BRakewel Automotive Components (I) Pvt Ltd. says:
    at

    Please advise what are limits/ specifications of DG Set/ Thermic Fluid Heater stack emission in mg/Nm3

    Required for UP Pollution control bOARD.

    Regards.

    Reply
    1. Perfect Pollucon Services says:
      at

      Thank you for the Question.

      You need to check those emission limits details in your “Consent to operate” provided by pollution control board.
      Thanks

      Reply
  2. rizal says:
    at

    How to sampling volatile organic compound in stack? Method?

    Reply
    1. Perfect Pollucon Services says:
      at

      Hi Rizal,

      You can refer to below mentioned article: http://www.cleanair.com/epamethods/Air-Test-Methods/m-18.php

      Reply
      1. dilipvasava says:
        at

        Stack monitoring sampling

        Reply
  3. chandrashekhar says:
    at

    simple way to determine stack velocity and flow rate and spfication or procedure for scrubber monitoring

    Reply
    1. Perfect Pollucon Services says:
      at

      Hi Chandrashekhar,

      Thank you for your comment.

      There is no simple way to measure stack velocity and flow rate. There are specific requirements for equipments by CPCB which needs to be followed.

      Keep coming for more.

      Reply
  4. Vijay deshmukh says:
    at

    For 70KVA DG set is required to get stack monitoring certication is available at aurangabad Maharashtra

    Reply
    1. Perfect Pollucon Services says:
      at

      Hi Vijay,

      Request you to contact us on 9930180059 for assistance.

      Reply
  5. Manish says:
    at

    Hiii,

    We have 125Kva DG set, where should be sampling of emission to be done??? sample collection port calculation etc.

    pls help

    Reply
    1. Perfect Pollucon Services says:
      at

      Hi Manish,

      Request you to contact us for more information. we would love to help you.

      Thank you.

      Reply
  6. Pushpa says:
    at

    what are quality checks we can do on stack emission,what is the expected CO2 correction in boiler .is it mandetory to mention in the data sheet.

    Reply
  7. pramod ghodeswar says:
    at

    sir , We have PNG RTHF 18 mtr stack , where should be made sampling collection port???

    plz suggest.

    Reply
    1. Anonymous says:
      at

      Hi Pramod,

      Please contact 9930180059 for more information. Thank you.

      Reply
  8. Abhishek Jain says:
    at

    what is stack height to be consider for 750, 1000, 1500 KVA & which guideline to be follow?

    Reply
    1. Perfect Pollucon Services says:
      at

      Dear Abhishek,

      The Central Pollution Control Board, New Delhi evolved the following formula for calculating minimum stack height to be provided to each Diesel Generation set for industrial, commercial, domestic and other purposes.

      H = h + 0.2 * capacity of DG in KVA.
      H = Total height of stack in meter.
      h = Height of the building in meters where the generator set is installed.
      KVA = Total generator capacity in the set of KVA.

      Thanks,
      Perfect Pollucon Services Team

      Reply
      1. Ganesh Raul says:
        at

        H = h + 0.2 * capacity of DG in KVA this formula to be corrected as ;
        H = h + 0.2 * √(capacity of DG in KVA)

        Reply
        1. Perfect Pollucon Services says:
          at

          Thank you Ganesh for Pointing out, but square root sign is already there. Maybe some devices are not able to show it properly.

          Anyways, Thank you.

          Reply
  9. Daniel Nicklin says:
    at

    Dear Sir,

    I am a PhD researcher based at Staffordshire University conducting research based on the measurement of particulate from stationary sources. I am currently conducting a short survey in the industry and would like to ask for your participation.

    I appreciate that this email may not have reached the right person but could I ask that this is passed to the relevant person in your organisation.

    I have included a copy of a link to the survey.

    https://www.esurveycreator.co.uk/s/dustparticulate

    I understand that you are busy but I would appreciate if you could find time to complete the survey.

    Should you require any further information, please do not hesitate to contact me.

    Kind regards,

    Daniel

    Reply
  10. Ashwini says:
    at

    are you MOEF APPROVED or tie up with Moef Approved laboratory

    Reply
    1. Perfect Pollucon Services says:
      at

      Hello Ashwini, We are tied up with MOEF Approved lab.

      Reply
  11. subrahmanyam says:
    at

    hi
    I require small information we have established 33 meters height DG Stack for 2850KVA DG Sets 2 nos, want to know the tolerances for Stack verticality. please help me in this regard.

    Thanks in advance

    Reply
    1. Perfect Pollucon Services says:
      at

      Hi Subrahmanyam,

      Sure, you can get in touch with us on 9967436537 for more information and quotation.

      Thank you, PPS Team

      Reply
  12. Rakesh Sharma says:
    at

    One of our client is looking for a monitoring device for stack monitoring for boiler. They do not want to transmit any data. The data generated shell be used for inhouse reference. Boiler capacity is 2 Ton/hr.

    Reply
    1. Perfect Pollucon Services says:
      at

      Hi Rakesh,

      Please call us on 9930180059 / 9967436537 for quick response.

      Thank you,
      PPS team

      Reply
  13. Kalaiarasi says:
    at

    Nice Explanation

    Reply
  14. ATISH MORE says:
    at

    dear sir,
    i have one question regarding unit of stack emission, we use microgram/Nm3 in stack. what it is denote “N” why use “N”???

    Reply
    1. Perfect Pollucon Services says:
      at

      Dear Atish,

      N denotes at Normal Temp at 273 degree K and 1 atm pressure.

      Thanks,
      PPS Team

      Reply
  15. Rohit Pandit says:
    at

    Good Afternoon Sir,

    Please suggest what is the criteria/ IS /CPCB standard for DG stack sampling point.

    Thank you,
    Rohit Pandit

    Reply
    1. Perfect Pollucon Services says:
      at

      Dear Rohit,

      You may find this useful.

      https://cpcb.nic.in/genset-notifications/

      Thanks,
      PPS Team

      Reply
  16. Prasad Varghese says:
    at

    What are the criteria pollutants in steel industry which should measure from final stack using CEMS and what are the minimum, normal and maximum ranges of the pollutants as per US EPA standards ?

    Thanks in advance for your answer.

    Reply
    1. Perfect Pollucon Services says:
      at

      Dear Prasad,

      If your manufacturing unit is in India, then you need to follow standards prescribed under Consent to Operate granted by State PCB.

      Thank You,
      PPS Team

      Reply

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Stack Emission Monitoring & Stack Emission Testing