C.A.V.T. (Cold Air Velocity Test)

Generally when flue gases pass through second pass of boiler, because of resistance offered by the tube bundles , the flow tends to take place through the gap between boiler casing and boiler coils. As the area of this region is very small compared to total flow area, velocity in this region increases. Due to combined effect of high velocity and impingement angle of ash particles the tubes in this region get eroded. To pin point such problem areas the second pass of boiler is divided in to number of planes, and velocity of cold air is measured on pre defined points on each of these planes. This data is used to design the erosion control devices which help to minimize the erosion of boiler tubes. Commonly, E.M.S. (expanded metal screens) are used as E.C.D.

With the help of carefully designed E.M.S., resistance is introduced in the gaps to reduce velocity in the problem area. The E.M.S. not only add resistance to flow through gap but also take the erosion and protect the boiler tubes from erosion. E.M.S.s are easily repairable and replaceable.

Gas Velocity test for Ducts :

To ensure equi distriburtion in various ducts, velocity and flow is measured in each duct. Diverter plates with designed shapes are provided in duct at corrected prices to ensure equi distributions.

Gas Distribution test for ESP :

Velocity measurement is carried out by animometer by forming the grid between first and second field of ESP. The distribution is made uniform across the cross section of ESP by


To determine the areas/ locations at which velocities are higher than respective plane average velocity.

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GD Test - ESP

To know the flow pattern within the ESP area.
To know the average velocity in the field

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GD Test - DUCT

To know the static pressure, dynamic pressure and velocity in the duct.

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Coal Mill Test

To determine the velocities in each P.F. pipes.
To adjust the orifice opening

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APH Performance Test

Evaluating Air Heater Performance.
Air Heater Performance Optimization / Design Provisions

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Noise Survey

After collecting data from field it is used for further post processing...

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Air leakage test:

Noise Data Acquisition:

After collecting data from field it is used for further post processing with the help of computer added instrumentation. The raw data’s can be converted and presented according to user defined way including SPL Vs time, SPL Vs frequency and utilizing Octave bands filters. The same is also used for validation with aero acoustics CFD results.