Knock out drums

Listing ID #3541123

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The Knock out drum is a vessel in the flare header designed to remove & accumulate condensed & entrained liquids from the relief gases. Both the horizontal & vertical design is a common....

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Product Details

The Knock out drum is a vessel in the flare header designed to remove & accumulate condensed & entrained liquids from the relief gases.

Both the horizontal & vertical design is a common consideration for the Knock out drum, which is determined based on the operating parameters as well as other plant conditions. If a large liquid storage capacity is desired and the vapour flow is high, a horizontal drum is often more economical. Also, the pressure drop across horizontal drums is generally the lowest of all the designs. Vertical knockout drums are typically used if the liquid load is low or limited plot space is available. They are well suited for incorporating into the base of the flare stack.

DESIGN FEATURES

Although horizontal and vertical knockout drums are available in many configurations, the differences are mainly in how the path of the vapour is directed. The various configurations include the following:

Horizontal drum with the vapour entering one end of the vessel and exiting at the top of the opposite end (no internal baffling)
Vertical drum with the vapour inlet nozzle entering the vessel radially and the outlet nozzle at the top of the vessel's vertical axis. The inlet stream should be baffled to direct the flow downward
Vertical vessel with a tangential nozzle. Vertical centrifugal separators differ from vertical settling drums in that the flow enters tangentially and spins around a centre tube, which extends below the liquid inlet nozzle. The gas and liquid flow radially downward through the annulus causing liquid droplets to coalesce along the walls and collect in the bottom of the drum. The vapour changes direction once below the centre tube and flows upward to the outlet nozzle. To avoid liquid re-entrainment, vapour velocity has to be kept low in the turnaround section of the drum. An additional measure to prevent liquid re-entrainment is a baffle plate below the turnaround section of the drum. The maximum liquid level is the same as vertical settling drums
Horizontal drum with the vapour entering at each end on the horizontal axis and a centre outlet
Horizontal drum with the vapour entering in the centre and exiting at each end on the horizontal axis
Combination of a vertical drum in the base of the flare stack and a horizontal drum upstream to remove the bulk of the liquid entrained in the vapour. This combination permits the use of larger values for the numerical constant in the velocity equation.

Company Details

Airoil Flaregas Pvt. Ltd. was established in 1984, as a joint venture company with Airoil Flaregas Ltd. of the UK. The British Company was acquired by Hamworthy Combustion Engineering Ltd., UK in 1993.
Hamworthy Combustion was acquired by Koch Industries USA in the year 2011 and since then, Airoil Flaregas in India became an independent Company.
Airoil Flaregas offers complete design, manufacturing, installation and commissioning services for flare system for Refinery, Petrochemical, Fertilizers, Steel Plants, Oil & Gas station and allied Chemical Industries.
With over twenty-five years of design & manufacturing expertise, coupled with excellent Project Management capabilities and customer relations, Airoil Flaregas today is a true leader in the combustion engineering industry.
Airoil Flaregas is a member of the HS Group of Companies, which has been serving the Engineering Industry for three decades with total dedication & commitment.