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Vent header slope criteria

asked May 11, 2014 in Process by cobiesmith (3,310 points)
How much is the adequate slope for vent headers?

1 Answer

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answered May 12, 2014 by RichS29 (4,320 points)

Vent headers must be provided with adequate slope for proper drainage and to element low points or pockets. API 521 5.4.1.3.7 recommends 1/4″ per 10 feet.

In addition to above recommendation following also needs to be considered:

  • Flare system route
  • Total elevation change from 1st discharge location to flare drum
  • PSV located higher than the Flare header
  • Piping support interval
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