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The Fluid Systems Engineering and Management Blog

by Swagelok Northern California

Pick The Right Cylinder For Your Grab Sample System

by Jeff Hopkins, on 10/12/18 8:45 AM

You have a choice of materials and connections to match your specific needs

"A sample cylinder is required for every Grab Sample Module (GSM) system and should be ordered separately when purchasing a new GSM. Various configurations of sample cylinder assemblies, defined as Grab Sample Cylinders (GSC), are available."

- From Swagelok's Grab Sampling Systems Application Guide

To transport a sample from the process line or pipeline to the lab for analysis, you can use either metal cylinders or glass bottles. Cylinders, often, will be your best bet. In fact, they are required if any time you need to transport a liquid under pressure, and any time you need to transport gas whether it's under pressure or not. Even when you don't have to transport a liquid under pressure, it may be worth doing anyhow. Some chemicals will evaporate or fractionate if they aren't transported under pressure. That could affect the accuracy of your analysis.

Rugged construction

Swagelok offers five standard cylinder sizes from 150cc to 1,000cc. The cylinder bodies are made of seamless tubing for consistent wall thickness, size, and capacity. The smooth internal neck transition eliminates trapped fluids. That makes them easy to clean in the lab before sending them back out into the field without having to worry about contaminating the next sample.



You can order cylinders made of 316L stainless steel, 304L stainless or Alloy 400.

Your have your choice of quick connect fittings, which make the cylinders easy to put in a grab sample module so that you can extract the sample quickly.

Other options include handles, bypass tubes for purging, rupture discs, outage tubes, and a variety of cylinder surface treatments (plain, electro-polished, PTFE-lined or Silconert-coated).


Outage-TubeRupture discs prevent complete depletion of the sample cylinder. Outage tubes provide a vapor space in cylinders containing liquefied gasses. That way, the liquid in the cylinder has a place to expand if the temperature rises. Without enough vapor space, even a small increase in temperature can cause the liquid to expand and dramatically increase the pressure.  The length of the outage tube determines the amount of vapor space.

As more industries bring additional analytical equipment online, it becomes more important to have quality sample stations that can accurately capture the process for later analysis. A grab sample cylinder is a key component.

Ordering sample cylinders is easy. Contact us through our website or call us at 510-933-6200.


Grab Sampling Systems App Guide MS-02-479-1 

Swagelok Grab Sampling Systems Application Guide (Catalog)

Download ›

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Topics:TipsGrab Sample Systems

We perform under pressure

Your fluid systems can't fail—and they can't leak. That's why Swagelok Northern California offers mission critical solutions for the petrochem, semi, power, and oil and gas industries around the Bay Area and into NW Nevada. We manufacture and assemble reliable, customizable components that get the job done. Contact our team today to learn about custom solutions for your plant or refinery.

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