Patent ID: 6074564
Filing Date: 2000-06-13
Classification: C02F

Abstract:
An apparatus for injecting a gas into a pressurized liquid wherein the pressurized liquid is taken from a liquid main and wherein a head pressure associated with the liquid in the liquid main varies over time; said apparatus comprising:a) a liquid piping system flow connected to said liquid main and having a riser leg, a down leg and a plurality of crossovers with each crossover selectively flow connecting said riser leg with said down leg; said liquid piping system operably receiving a side stream of liquid from the liquid main; each of said crossovers including a flow control valve mechanism to allow flow of said liquid side stream through a selected one of said crossovers while preventing flow through a remainder of said crossovers; andb) a gas manifold having a plurality of branches with each branch conveying said fluid to a respective one of said crossovers; each of said gas manifold branches including a control valve to allow selective flow of said fluid into said liquid at said selected one of said crossovers, such that said gas is injectable into said liquid at an injection pressure substantially lower than said head pressure.