How to safely and reliably sample gases, volatile liquids


An industrial facility’s quality control operations often involve sampling gas processes at regular intervals to ensure process fluids are adhering to internal or customer-based specifications.

Samples are typically drawn from a process line and transported to a centralized laboratory within a facility. This process – known as grab sampling, spot sampling, field sampling, or just sampling – can help operators verify process conditions and validate product quality. It must be performed consistently, in adherence with established best practices, to ensure samples best represent true process conditions, and thereby contribute to reliable analyses. Grab sampling is also commonly used to validate readings obtained by a real-time online analyzer.

When sampling gas or volatile liquid processes, technicians and operators must contend with unique challenges to obtain an accurate representation of real process conditions. They can overcome these challenges by following a few guiding rules and by using modern grab sampling technology that eliminates some of the potential for human error from the process. This article will detail how to draw and analyze gas samples more safely and reliably.

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