PURGE AND PRESSURISATION SYSTEM

PPI ENGINEERING IS ONE OF THE LEADING SUPPLIERS OF PURGE AND PRESSURISATION SAFETY DEVICES IN THE WORLD.

Ensures safe operation of electrical machines with Zone 1/21 and 2/22 hazardous areas

Designed in accordance with IEC 60079-2/EN 60079-2

Operated under ISO 9001:2015

CML 21UKEX11076X, CML 15ATEX1185X and ICECEx CML 15.0089X certified

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

Fully automatic electronically controlled system, reducing commissioning time (does not require outlet valve orifice plate changing to achieve correct flow rate)

Minimum supply pressure of 3 barg

No pneumatic connections between inlet and outlet unit, reducing installation time

Risk of failure minimised due to simplified layout – fewer components needed

Automatic machine leakage compensation display – essential information for machine maintenance

LCD information display

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

Mechanically interchangeable with expo systems

No pneumatic logics used, therefore reducing the possibility of faults created by leakages or blockages

Local or remote control/monitoring

Automatically compensates varying air leakages in machine, eliminating the need for manual valve leakage adjustment

MODEL

PP0919.1.1 PP0919.3.1 PP1214.1.1

PP1214.3.1

PP1214.PV.3.1

TYPE

Max flow

Fixed flow

Adaptive flow

Pre-start ventilation

LEAKAGE COMPENSATION

Manual ball valve

Automatic electrical solenoid valve

Manual ball valve with automatic boost (backup)

Automatic electrical solenoid valve with automatic boost (backup)

None