Patent ID: 7661436
Filing Date: 2010-02-16
Classification: E21B,F16K,Y10T

Abstract:
1. A device comprising: (a) a bent tube of U shape, such U-tube having one arm connected to a first pipe collecting vented gas released from a plant and leading to a flare stack, another arm connected to a liquid holder; (b) a second pipe, fitted with a non-return valve, connecting the bottom of the liquid holder to the bottom of the U-tube; (c) the top of the liquid holder connected to the first pipe leading to the flare stack by a third pipe; wherein there is provided a piping connecting the top of one arm of the U-tube to the third pipe; the U-tube and the liquid holder forming a structure so as to form the only passage available for the gas to escape from the plant to the flare stack; such gas escaping from the plant to the flare only when the liquid in the said U-tube has been completely displaced into the liquid holder due to the pressure applied by such escaping gas.