Sample Probe Insertion Depth in Gas Pipelines with Liquid Contaminants

摘要

From these tests, recommendations are possible on probe insertion depths in gas pipelines that may carry small amounts of liquid contaminants. A key observation is that samples from the straight-cut probe in the API Type I flow were repeatable. This suggests that the Type I gas-liquid flow patterns were stable and that the straight-cut probe can block some, but not all, of the mist from entering the sample. The Type I tests also showed that the local LVF due to mist in the gas core decreases toward the top of the pipe. Therefore, to minimize liquid ingestion from Type I flows, it is preferable to insert the probe tip to a depth above the center one-third of the pipe cross section.