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PURGE SYSTEM – PPI Engineering’s market leading Purge and Pressurisation safety device ensures the safe operation of electrical machines and enclosures within Zone 1/21 and 2/22 hazardous areas. The unique attributes of this system provide numerous advantages over its competitors.

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ATEX Certification
ATEX Quality Assurance Notification
IECEX Certification
IECEx Quality Assessment Report

Concept – Refer to brochure for more details


PP1214 is designed in accordance with IEC 60079-2:2014 Ed 6/ EN 60079-2:2007, ensuring a pressurised and leakage compensated enclosure. This creates a non-hazardous atmosphere inside the enclosure by keeping a positive differential pressure between the pressurised enclosure and atmospheric pressure to ensure that no potentially explosive gases enter the electrical equipment.

This type of protection consists of two main stages:


Purge Cycle:

Activated when the electrical machine is OFF prior to being switched ON. Clean air/inert gas is blown through the machine and monitored to ensure compliance with IEC 60079-2:2014 Ed 6/ EN 60079-2:2014.

Leakage Compensation and Pressurisation Cycle:

Once purge cycle is satisfactory the machine is considered non-hazardous and ready to be switched ON. A positive differential pressure to atmospheric has to be maintained. This is achieved by compensating for any air/inert gas leakages that the machine might have.

Inlet Unit

Outlet Unit

Micro Controller

System Advantages


  • Minimum supply pressure of 3 barg
  • Fully automatic electronically controlled system, reducing commissioning time (does not require outlet valve orifice plate changing to achieve correct flow rate)
  • No pneumatic connections between inlet and outlet unit, reducing installation time
  • Automatically compensates varying air leakages in machine, eliminating the need for manual valve leakage adjustment
  • Automatic machine leakage compensation display – essential information for machine maintenance
  • LCD information display
  • Mechanically interchangeable with expo systems
  • Up to 4250ls/min [standard litres per minute] automatic leakage compensation already built in, i.e. no additional “BOOST”equipment needed to increase leakage compensation
  • Local or remote control/monitoring
  • No pneumatic logics used, therefore reducing the possibility of faults created by leakages or blockages
  • Risk of failure minimised due to simplified layout – fewer components needed
MODEL CONTROL LEAKAGE COMPENSATION
PPI214.1.1 Remote Manual Ball Valve
PPI214.2.1 Local Manual Ball Valve
PPI214.3.1 Remote Automatic Electrical Solenoid Valve
PPI214.4.1 Local Automatic Electrical Solenoid Valve
PPI214.PV.3.1 Remote Pre-Start Ventilation
PPI214.PV.4.1 Local Pre-Start Ventilation