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Purge and Pressurization Systems

Bulletin Number:

  • HLP
  • Industry Standards:

    Type X Ex [px] Ex [p] IECEx SIR.0019X [Gb, Db] Europe, ATEX Category 2 GD Cert no Sira 14ATEX1045X USA/Canada NFPA496 Cl I Div 1 Groups A, B, C & D UL E466718 Type Y Ex [py] Ex [p] IECEx SIR.0019X [Gb, Db] Europe, ATEX Category 2 GD Cert no Sira 14ATEX1045X North America Cl I Div 1 Groups A, B, C & D For protecting Cl I Div 2 equipment UL E466718 Type Z Ex [pz] Ex [p] IECEx SIR.0019X [Gc, Dc] Europe, ATEX Category 3 GD Cert no Sira 14ATEX1045X North America Cl I Div 2 Groups A, B, C & D UL E466718
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    Purge and Pressurization is a protection method used with Type 4, 4X and 12 (IP54 recommended minimum) enclosures. The enclosure is initially purged to remove any internal explosive gases or dust. Once this is accomplished, the enclosure is pressurized with a protective air or inert gas supply. This provides a positive internal enclosure pressure which keeps any external explosive gases or dust from entering the enclosure.

    Application:

  • Purge and Pressurization is a protection method used with Type 4, 4X and 12 (IP54 recommended minimum) enclosures. The enclosure is initially purged to remove any internal explosive gases or dust. Once this is accomplished, the enclosure is pressurized with a protective air or inert gas supply. This provides a positive internal enclosure pressure which keeps any external explosive gases or dust from entering the enclosure. The two methods of purge and pressurization offered are Leak Compensation and Continuous Flow.
  • Leak Compensation maintains positive pressure by compensating for losses. System consists of Control Unit and Relief Valve. Certification Type Y and Z models: • Flush (internal) or external mount models • Local visual alarm indicator and dry contact output for remote alarm • Typically recommended for enclosures with volume of 60 Ft3 or less. Certification Type X Model: • Provides power disconnect when pressurization is lost or not attained • Provides automatic purge process • External mount • Local visual alarm indicator and dry contact output for remote alarm • Typically recommended for enclosures with volume of 60 Ft3 or less.
  • Continuous Flow provides positive pressure via continuous protective air flow through the enclosure. System consists of Control Unit, Calibrated Outlet Orifice and Relief Valve. Certification Type Y and Z Models: • Flush (internal) or external mount models • Local visual alarm indicator and dry contact output for remote alarm • Typically recommended for enclosures with volume of 17 Ft3 or less
  • Features:

  • All exterior components are 316 stainless steel or corrosion-resistant composite
  • Space-saving flush or exterior mounted models available
  • Local visual indicators provide system status
  • Leak compensation models are equipped with rapid purge valve and visual purge status indicator
  • All models utilize dry, clean inert gas supply of 60 PSI (4 bar) to 115 PSI (8 bar)
  • Ambient operating temperature -4F (-20C) to 131F (55C)
  • Type X models provide automatic purge cycle and 4PNO/20A/440VAC power contactor with 115 VAC or 230 VAC coil
  • Finish:

    Brushed 316 Stainless Steel

    Accessories:

    Service Parts Kit for both Leak Compensation and Continuous Flow models

    Modifications and Customizations:

    Hoffman excels at modifying and customizing products to your specifications. Cut-outs for mounting purge and pressurization devices can be easily added to your enclosure. Contact your local Hoffman Representative or Distributor for more information.

    Notes:

  • For all IEC and ATEC applications, the final or complete integrated assembly must be submitted to a notified body for certification.
  • See Specification Sheet for Purge and Pressurization Systems and Certifications table.
  • Drawings and Technical Publications are available by clicking the "Items" tab. Select your desired Catalog Number and click on the Downloads tab for that particular catalog number.
     
    Catalog Number Operation Type Mounting Type Certification Description
    Catalog Number Operation Type Mounting Type Certification Description
    Leak Compensation Flush Mount Y and Z -
    Leak Compensation Exterior Mount Y and Z -
    Continuous Flow Flush Mount Y and Z -
    Continuous Flow Exterior Mount Y and Z -
    Leak Compensation Exterior Mount X (120 VAC) -
    Leak Compensation Exterior Mount X (230 VAC) -
    - - - Purge and Pressurization Leakage Compensation Service Kit
    - - - Purge and Pressurization Continuous Flow Service Kit