ethane are separated knock out drum 26 also operates on a float system such that a portion of the liquid is drained when the liquid reaches a preset level the main vapor stream enters a second heat exchanger 28 where it exchanges its cold energy with a counter current warmer stream passing along the storage diversion line 22 upon exiting heat exchanger 28 the temperature is increased the main vapor stream then passes through another heat exchanger 30 where additional heat is gained the main vapor stream then passes through another heat exchanger 32 where additional heat is gained finally the main vapor stream passes through heat exchanger 18 exiting at a pressure of approximately 7 bar and a temperature above 0 degrees c the main vapor stream now enters the regional pipeline distribution network 14 the vapor slipstream of diverted gas passing along storage diversion line 22 after exiting knock out drum 20 at high pressure and temperature below 0 degrees c flows to the heat exchanger 32 to preheat the main vapor stream the diverted gas exits heat exchanger 32 and flows into knock out drum 34 to separate ngl from the vapor in the diverted gas knock out drum 34 operates on a float system such that a portion of the liquid is drained when the liquid reaches a preset level the vapor in the.