Abstract: At least some embodiments a flare includes a gasket sized and shaped to prevent gas-leakage at the gas slot when pressure of gas entering the flare is below a designed minimum opening pressure that causes the flare bowl to move away from the tip housing. At least some embodiments of a flare includes a diaphragm spring coupled with the flare bowl to assist in movement of the flare bowl with respect to the tip housing to vary an opening dimension of a gas-exit slot defined by the flare bowl and the tip housing.

Abstract: A flare burner that is particularly suitable for use in connection with ground flares and other types of flares in which it is important to control the height of the flame envelope created by the burner is provided. The flare burner includes a pre-mix zone including a pre-mix chamber into which air is entrained. A uniform mixture of fuel and air is formed in the pre-mix zone and caused to exit an air/fuel outlet in the top of the pre-mix chamber. In one embodiment, the amount of air in the fuel/air mixture that exits the air/fuel outlet is in excess of the stoichiometric amount of air required to support combustion of the fuel in the mixture. Fuel is injected around the perimeter of the air/fuel outlet, combustion is initiated and a flame envelope is created. By injecting a mixture of fuel and air that includes excess air into the center of the flame envelope, combustion of the central portion of the flame envelope is accelerated which allows more fuel to be flared with a given flame envelope height.