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SWAGELOK GRAB SAMPLING SYSTEMS

Purpose & Variables in Grab Sampling

Get details in the free Swagelok Grab Sampling Systems Application Guide_Stack_300

Review foundational information on grab sampling below, and learn more by getting a free copy of the Swagelok Grab Sampling Systems Application Guide.

Common terms

Grab sampling, also known as "lab sampling" or "spot sampling", is the collecting of a sample of liquid or gas in a pipeline, tank, or system with the intent of transporting the sample to a laboratory for analysis.

Function

Grab sampling can validate process conditions, help ensure end products meet quality specifications, show that online analyzers are "fit for use", and verify product quality during custody transfer.

It can also provide verification of environmental emissions. In all of these uses, capturing a representative sample is essential. However, placing a captured sample into an open bottle for transport back to the lab may not provide a representative sample. Some chemicals will evaporate or fractionate if not maintained under pressure.

Variables

Sampling is the science of safely capturing a sample from a process or a pipeline while maintaining the chemical composition during storage or transport for later analysis. Depending on the process phase, temperature, consistency, chemical makeup and other factors, there are a variety of approaches that can be used to extract a sample. Determining the container type needed is the first decision of several decisions that must be made in order to select the appropriate sampler.

Another important aspect is the temperature of the system fluid. Many processes operate at elevated temperatures and can pose a hazard from direct scalding during operator interaction or from the temperature limits of seats and seals being exceeded. Swagelok recommends consideration of a sample cooler when the supply temperature exceeds 60°C (140°F). Thermal safety may affect sample integrity.

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