Control Systems Consultants
Specializing In Enclosure Purging Systems

Retail Customers
.........................Wholesale Vendors

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Purge Systems

C.S.C.I. manufactures purge systems that meet ISA and NFPA code requirements.  Purge systems for enclosures play a critical role in industries that deal with explosive gases or dust.  General-purpose equipment cannot be used in these areas due to safety requirements. The NFPA Code 496 has established rules to allow purging of enclosures to reduce the internal classification.

Purge systems meeting ISA and NFPA codes require a specific quantity of positive airflow to eliminate any hazardous gas or dust that may be present. The purge system then maintains a positive pressure within the enclosure to prevent gas or dust from re-entering.  This process allows the use of less expensive NEMA 4 enclosures since the internal atmosphere is safe.

C.S.C.I. builds type X, Y, and Z purges.  The X and Z purges allow use of general-purpose equipment inside the enclosure. Type X and Y purges require hermetically sealed equipment or explosion proof equipment that has a lower rating.

Purge types and area class reductions are as follows:
Type "X" - Class 1 or 2, Division 1 to Non-Hazardous
Type "Y" - Class 1 or 2, Division 2 to Class 1 or 2, Division 2
Type "Z" - Class 1 or 2, Division 2 to Non-Hazardous

Reference NFPA Code 496 and ISA Code S12.4 for additional information