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Title: Natural Gas Sampling Systems, The Good And The Bad: A Field Mans Perspective
Author: Mark W. Smyth
Source: 2007 Natural Gas Sampling Technology Conference
Year Published: 2007
Abstract: I use a ball valve with a regulator mounted on the top of my pipeline for my moisture analyzer sample gas and it works for me. Why do I need an expensive probe/regulator in the line or anything else? I pull a tube for moisture vapor off the orifice meter piping going to my chart recorderit never agrees with the pipeline techs portable moisture analyzer. The tube must be rightI can see the stain. I dont trust those electronic meterscant see whats going on! In the winter months I dont understand why the moisture vapor reading on my analyzer is extremely low during the nighttime, and during the day it becomes very highit seems my moisture analyzer is only an expensive clock. During colder weather, the sensor in my oxygen analyzer fails and I must replace it a couple of times. What is wrong? The sensor in my moisture analyzer becomes contaminated in a very short time, and it is necessary for me to recondition the sensor in only one to two weeks. I installed a probe/regulator with a membrane filter in my sample system, but it didnt seem to help. These common statements and the hidden measurement errors due to improper sampling methods will be reviewed in this paper, along with viewpoints on why some field technicians are not following existing standards. Problems with misapplication of membrane separators and vapor absorbents for glycol, amines and compressor lube oil will also be discussed in this paper along with suggestions for proper application of these devices.

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