4/14/2023 0 Comments Diluvion sealable drumThe knockout drum dimensions are to be 6 ft (1.8 m) in diameter × 40 ft (12 m) in length. An ideal design has all of the flare system draining downhill to the flare knockout so liquid cannot accumulate. What is the gas and liquid load that should be used for sizing, and how do you get rid of the liquid once it is in the flare knockout drum? The liquid can be coming directly from a process, and other times it may just be accumulated liquid in the flare headers. The engineering problem with these drums is how to design the correct size. If the liquid gets into the flare stack and is spewed out, it will catch fire and the burning liquid will pour down like rain into the operating unit. Maurice Stewart, in Surface Production Operations, 2021 6.7.5.1 BackgroundĪ flare knockout drum’s purpose is to remove any liquid from the gas going to the flare. In practice, most separation problems are solved by the following types of separating equipment. In addition, there are constraints due to space or weight that often affect the choice of separators, the need to handle solids or effect a three-phase separation, and the requirements for liquid holdup. Therefore, a separator for such duty must be adequate. This is because the conditions of the flowing mixture and the efficiency of separation may vary widely. In some cases, it is important to separate liquid and gas flowing simultaneously through a pipe. The second category comprises equipment such as reactors, mixers, distillation columns, and heat exchangers. Alternatively, they provide phase separation by settling. Empty separators are drums that provide intermediate storage or surge of a process stream for a limited or extended period. The vessels used for processing in the chemical process industry (CPI) are principally of two kinds: those that are without internals and those with internals. The process engineer is often required to design separators or knockout drums for removing liquids from process gas streams. Kayode Coker, in Ludwig's Applied Process Design for Chemical and Petrochemical Plants (Fourth Edition), VolGAS–LIQUID SEPARATORS The overflow chamber can be designed to flow back automatically into the sealing chamber once the gas velocity decreases below the rate required for closing off the second stage.Ī. It is also common to design the deep seal drum with a concentric overflow chamber to collect the displaced sealing fluid. It is important to design the deep seal drum with a proper gas velocity at the staging point to ensure that all the sealing fluid is displaced quickly at the staging pressure (an effect similar to a fast-acting valve actuator). In a shallow seal drum (conventional flashback prevention), the water seals have only a 6-10-in. ![]() The sealing-fluid depth in most staging seal drums is typically in the range of 2-5 psig, which is equivalent to 5-12.5 ft of water column. In a deep seal drum, the depth of the sealing fluid is designed to be equal to the staging pressure of the staged flare system. Seal drums serve as a final knockout drum to separate liquid from the relief gases. This prevents air or gas from flowing backward beyond the water seal. The flare gas (or purge gas) is forced to bubble through a layer of water before it reaches the flare stack. Water (or water/glycol mixture) is normally the sealing fluid. ![]() Liquid seal drums are vessels that are used to separate the relief gases and the flare/header stack by a layer of liquid. Knockout drums are sized with the gas-capacity equations referred to in Chapter 4 of Volume 1 of the series. PhD, PE, in Surface Production Operations (Third Edition), Vol11.7.4 Seal Drums
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