THE HP CASING IS USED FOR CIRCULATION OF NITROGEN FOR FRONT END WARM UP.THE LP CASE TO BE VENTED TO ATMOSPHERE DURING THIS OPERATION.SUCTION FOR NITROGEN CIRCULATION IS UPSTEAM OF THE SECOND STAGE INLET COOLER. GAS IS 100% NITROGEN AT 4BARA AND 160°C MAXIMUM ATINTERSATGE COOLER INLET. MINIMUM FLOW IS 27000KG/HR AND THE COMPRESSOR IS TO OPERATE AT MINIMUM SPEED. ACTUAL FLOW RATE, PRESSURESTEMPERATURES AND ESTIMATE OF NITROGEN LOSSES TO BE ADVISED BY THE VENDOR.