India’s largest Oil Company under its expansion programme was setting up a Naphtha Cracker and downstream polymer units in North India. With a project cost of more than US $ 3 billion, the Naphtha Cracker unit is designed to produce 857,000 tons per annum of ethylene and 650,000 tons per annum of propylene.
The refining and petrochemical processes release a lot of corrosive gases into the environment. These corrosive gases seep into the control room and attack the controller cards of the DCS control systems, thereby corroding the minute circuits, resulting in failure of the cards.
Based on the current and required air contamination levels provided by the customer, Indus designed, assembled & supplied the chemical air filtration system to purify the air inside the control room and maintain GI level as per ISA (Instrumentation Society of America) standards.

The system designed has 3 stages of filtration. The system consists of a 2 inch dust filter which is then followed by 3 stages of chemical filters and then finally followed by a 6 inch dust fine filter. A suitable blower has been provided to maintain the pressurization inside the control room. The 3 stages of media used are MM 9000 (2 stages) and MM 1100. The system used activated carbon impregnated with KOH (MM – 9000) and activated alumina impregnated with KMNO4 (MM – 1100) for dry gas phase air purification using the process of chemisorption. i.e. adsorption and chemical neutralization.
The supply of the chemical air filters were carried out under the approval of various EPCs & PMCs viz EIL ( Engineers India Ltd), L & T (Larsen & Toubro); Technimont ICB; Uhdhe India Ltd; Indian Oil Tanking.

Inspection & Quality:
These units were inspected by third party inspection agencies like SUD, TUV & SGS; thus verifying consistent quality and supply as per specification.

No. of Units:
Indus has supplied more than 30 units for various control room air purification applications for this site alone.