Closed Loop Sampling Systems: How to Reduce Emissions

Closed-loop systems often represent the best method to help operators reduce emissions and improve safety.

Comparatively, some sampling methods may instead involve drawing process fluid, flowing it through the sample point, and flaring or otherwise disposing of the excess. Other methods may simply tap part of the main process while the operator manually draws fluid into an open container. These alternative methods not only increase the potential for unwanted fugitive emissions via flaring or exposed processes, but they can also present significant safety threats to operators. Because they can eliminate waste by returning fluid to the main process, and because they can shield both operators and the environment from exposure to the fluid, closed-loop systems often represent the best method to help operators reduce emissions and maintain safe working environments.

Qualities of Leak-Tight Closed-Loop Sampling Systems

A closed-loop system must be designed and constructed properly to minimize leaks at sampling points throughout the facility. There are a few features to look for when selecting a closed-loop system:

Sampling systems are constructed from leak-tight components. A sampling system’s quality depends on the quality of its components. For example, low emission (low-E) valves—which demonstrate through rigorous testing per API standards that they can minimize fugitive emissions—may be incorporated into your sampling system’s design to minimize the potential for unwanted leaks. Certified low-E valves and other components are becoming increasingly common throughout the industry and in various fluid system applications as emissions regulations become stricter. Learn more about swapping in low-E valves and other ways to combat fugitive emissions in this article.

Sampling systems are designed and assembled to minimize potential leak points. Even the highest-quality valve or fitting has the potential to leak under certain conditions. By designing systems with as few connection points as possible, however, you can reduce the potential for unwanted leaks and resulting fugitive emissions. If leaks do occur where high-quality components have been used, this is typically a result of improper installation practices. Be sure that your grab sampling systems have been assembled and tested by trained specialists to avoid these issues.

Sampling systems feature optimal sample drawing technology. The point at which the technician draws the sample into a bottle or cylinder container represents another point where leaks can occur. There are a few technologies that can help eliminate them.

In a liquid closed-loop system where samples are collected in bottles, the fluid is commonly dispensed via a needle that pierces a rubber septum. Ideally, as the needle is withdrawn, the rubber septum reforms a complete seal. Lancet point needles are commonly used in these applications, but they may accidentally cut or “core” the septum, allowing fluid to escape. A better needle design option is the pencil point needle, which reduces the potential for cutting the septum with a unique design that discharges the sample through a hole on the needle’s side. Learn more about these technologies for optimizing liquid sampling in this article.

In gas or volatile liquid sampling systems where cylinders are used, cylinders that feature easily operable quick connects will allow for efficient and safe connecting and disconnecting from your sampling point.

Reducing Fugitive Emissions in Sampling Systems

Well-designed, closed-loop sampling systems can limit fugitive emissions by preventing exposure of process fluid to the environment. They can also reduce risk to sampling system technicians by keeping process fluids fully contained. The right supplier can provide easy-to-use, easy-to-maintain grab sampling panels in standard, configurable designs that can be reproduced across your facilities, not only minimizing fugitive emissions and risk, but simplifying operator training and potential for errors.

Interested in learning more about how to reduce leaks and subsequent fugitive emissions at your sampling points? You have options. Find the closed-loop sampling panels, sampling system design training, or troubleshooting support you need by reaching out to a local specialist.

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