The Role of Gas Detection in Offshore Applications

Offshore drilling is a highly hazardous process with dangers of complex equipment, harsh environments, severe weather, as well as toxic gases and volatile organic compounds (VOCs) which can be found mixed in with the products being extracted.

The Role of Gas Detection in Offshore Applications - ION Science

Toxic gas emissions are a danger in the environments in which offshore applications are found, creating unsafe conditions for personnel. This results in various long term health issues, injuries and fatalities. The ignition of flammable gases or vapors can lead to fire and even sudden, normally fatal explosions.

Hydrocarbons, hydrogen sulphide, benzene and mercury vapor are a few of the gases that exist within offshore applications.

Hydrocarbons are a group of gas made up of hydrogen and carbon atoms, all of which are combustible and may be released under pressure from the well. Releases may also occur on the rig floor, around the vicinity of the test separator and about the choke manifold of an application.

Hydrogen sulphide is a toxic gas that occurs naturally as a contaminant in sour wells and is one of the most regulated in offshore applications. Concentrations often exist at the lowest points of rigs, such as the cellar deck. While hydrogen sulphide is one of the most well-known and regulated of the toxic gasses there are other substances which are not as widely regulated or considered to be of concern in offshore applications.

Benzene is one of these VOCs and exposure to benzene has been associated with a range of acute and long-term adverse health effects and diseases, including cancer and aplastic anemia. Benzene evaporates easily and most people can just detect its distinctive smell at concentrations between 2.5 and 5 parts per million (ppm) in air.

Mercury is a natural component in oil and gas and during drilling operations, it can accumulate on pipes and other processing equipment. As processing fluids are cooled, the liquid mercury condenses within heat exchangers, separators, valves, and piping.

Rather than having to rely on human senses in a workplace setting, it is advisable to use an appropriate form of quantitative monitoring; the onus is on the employer to assess the risk. Remembering the adage attributed to Lord Kelvin that you can’t manage what you don’t measure. There are methods published by NIOSH that can be used to capture air samples for later analysis, but this occurs after exposure could have taken place. Therefore, real-time methods are preferable which can range from fixed, permanent systems for fence line applications, hand-held devices for area measurements or confined space entry and most recently developed, personal monitors that can alert a worker of an immediate hazard, these personal devices are currently being use in offshore applications within the Gulf of Mexico and across Europe.

The Role of Gas Detection in Offshore Applications - ION Science

With over 30 years of knowledge in the oil and gas industry, ION Science offers a full range of proven PID sensors and instrumentation designed to meet customer requirements and provide the best detection capabilities available. All our PID technology incorporates resistance to humidity and contamination for reliable performance within the harshest working environments, minimizing drift issues and maximizing uptime of your instrument–providing a true safety solution.

To learn more about our products for your offshore application, contact us today.

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