English to Russian Tech/Engineering Petroleum Eng/Sci Cooling Tower

Vacuum Pump System
A vacuum system is provided at cooling tower fan deck to create and maintain the siphon effect in the tube bundles (dry section) which allows the circulating water pumps to run at lower head.
For initial evacuation of the cooling tower, two numbers of vacuum pumps are used to evacuate the air until an acceptable vacuum has been achieved. Air leakage through connection and non-condensable gases in the cooling waters cannot be avoided. The gases are continuously extracted from cooling tower by a vacuum pump and discharged to the atmosphere to maintain vacuum pressure.