Separation/treating

Natural-Gas-Liquids Recovery—Retrofit Breathes New Life Into Old Scrubber

This paper presents details of the retrofit scrubber design and shows the importance of using high-efficiency separation internals.

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Fig. 2—Flow in the retrofitted vessel, with path-line colors representing velocity.

An onshore gas-processing facility in Southeast Asia currently receives rich wet gas from an offshore production unit. Because of an inefficient scrubber design, the gas-processing facility was experiencing natural-gas-liquid (NGL) carryover of 1,550 B/D from the scrubber into the pipelines. A retrofit scrubber was designed to increase the NGL production by 8,540 B/D. This paper presents details of the retrofit scrubber design and shows the importance of using high-efficiency separation internals.

Challenges With the Existing Scrubber

The condensate scrubber vessel was originally designed to handle 300 MMscf/D of gas. The condensate scrubber had an inlet vane and pack internals along with a mesh pad for final demisting.

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