VESSEL SYSTEMS LIQUID SEAL A Liquid Seal may be incorporated in a combustion system when there is a danger of the waste gas "Flashing back". If the plant waste gas is highly volatile, there is a danger that an explosion ignited at the flare tip could propagate up the waste gas header and damage the plant. A liquid seal provides a positive water block to stop any source of ignition from traveling upstream. Liquid seal vessels can be incorporated in the flare or waste gas header, or be integral in the flare base. The gas entering the liquid seal may be bubbled into the water through a pipe type inlet. If the gas stream is not steady, or the flow is large, a diffuser hood assembly will be employed to dampen the surging motion of the water in the seal. It is extremely important to use internal baffling, or a diffuser to prevent the liquid in the seal from surging. When waves, or turbulence form in the liquid seal there can be seconds when the liquid does not completely seal the entrance to the waste gas header. Liquid seal vessels, whether installed in the waste gas header, or in the flare base can be supplied with the following options: Vessels are sized according to clients' process requirements. Construction can be of Carbon Steel, or for corrosive services Stainless steel. Automatic level controls can be included to maintain the liquid level in the seal. Two-inch flanged drain connection for draining and cleaning the vessel. Man way with hinged cover can be supplied for internal inspection and repair. All vessels are manufactured in accordance with ASME code. A code stamp, and stamped drawings are also available. top