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Beautiful_Leaves BG.jpg Environmental Norms -Diesel Generator Set
Diesel Generator Sets

Stack Height : 

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.

Based on the above formula the minimum stack height to be provided with different range of generator sets may be categorized as follows:

For generation sets Total height of stack in meter
50 KVA 
50 - 100 KVA 
100-150 KVA 
150-200 KVA 
200-250 KVA 
250-300 KVA 
Ht. of the building + 1.5
meter Ht. of the building + 2.0 
meter Ht. of the building + 2.5
meter Ht. of the building + 3.0 
meter Ht. of the building + 3.5 
meter Ht. of the building + 3.5 meter

 Similarly for higher KVA ratings a stack height can be worked out using 
the above formula.

Noise level from DG sets:-

Necessary noise control equipment such as mufflers have to be provided to DG sets with Insertion loss of minimum 25 dB (A) so as to ensure ambient noise level both within and outside the industrial hall not exceed the below mentioned limit.

Day Time (6 A.M. to 9 P.M.) 75 dB (A) Leq
Night Time (9 P.M. to 6 A.M.) 70 dB (A) Leq

The total sound power level of a DG set, at the user's end, shall be within 2 dB (A) of the total sound power level of the DG set, at the manufacturing stage. 


The acoustic enclosure/acoustic treatment of the room should be designed for minimum 25 dB (A) insertion loss or for meeting the ambient noise standards, whichever is on the higher side ( if the actual ambient noise is on the higher side, it may not be possible to check the performance of the acoustic enclosure / acoustic treatment. Under such circumstances the performance may be checked for noise reduction up to actual ambient noise level, preferable in the night time ) . The measurement for Insertion Loss may be done at different point s at 0.5 m from the acoustic enclosure/room and then averaged.

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