Measurement and Testing

  • Analytical measurements for natural gas processing

Analytical measurements for natural gas processing

Jun 19 2019 Read 2057 Times

One of the first steps in a natural gas treatment plant is the reduction of acid gas components.

Raw natural gas is a complex mixture of methane (CH4), hydrocarbon condensates (natural gas liquids – NGLs), water, and contaminants; hydrogen sulfide (H2S), and carbon dioxide (CO2).

Reliable solutions that help to efficiently control the process of separating methane from other hydrocarbons, water and contaminants are indispensable. Monitoring contaminants is particularly critical for process optimisation and gas quality.

But how do you most effectively monitor H2O, H2S, CO2, and O2 in natural gas?

Traditional approaches

  • Lead acetate tape analysers work but have high maintenance requirements to replace and dispose of the tapes in an environmentally safe manner
  • On-line gas chromatographs take 3 – 6 minutes between measurement updates and do not sense rapid changes. High OPEX due to consumption of carrier gas and flame fuel cylinder gases
  • Broadband UV light sources and narrow band pass filters are prone to interference from changing background concentration

Gas processing made easy

High resolution Tunable Diode Laser Absorption Spectroscopy (TDLAS) analysers from SpectraSensors, an Endress+Hauser company, provide significant advantages over other technologies for monitoring H2O, H2S, and CO2 in natural gas and NGLs.

  • Eliminate errors due to interference encountered with other spectroscopic techniques
  • Exceptionally fast response
  • No field calibration/ re-calibration required
  • Low cost of ownership - no consumable items needed

Example natural gas processing applications

On-line monitoring of H2S and CO2 in Gas Sweetening: Measure acid gas concentration at the inlet and outlet of an amine treatment unit to help optimise the performance of this module. TDLAS analysers have fast response to H2S and CO2 concentration changes.

On-line monitoring of trace-level H2O: Detect adsorbent bed saturation and breakthrough to enable highly effective control of molecular sieve dehydration systems. Laser-based measurement is highly selective and accurate for H2O in natural gas.

Find out more about how Endress+Hauser can make gas processing easy.

Take a look at two specific application notes: H2S in amine treatment unit outlet and CO2 in amine treatment unit outlet.

Reader comments

Do you like or dislike what you have read? Why not post a comment to tell others / the manufacturer and our Editor what you think. To leave comments please complete the form below. Providing the content is approved, your comment will be on screen in less than 24 hours. Leaving comments on product information and articles can assist with future editorial and article content. Post questions, thoughts or simply whether you like the content.

Post a Comment

Digital Edition

Petro Industry News November 2019

November 2019

In This Edition Fuel for Thought - Leading European sensor trade event taking place in 2020 already selling out fast - Endress+Hauser and Vector CAG secure contract at large Texas refinery...

View all digital editions


OGAV 2019

Nov 13 2019 Vung Tau, Vietnam

Oil. Gas. Chemistry

Nov 20 2019 Krasnoyarsk, Russia


Nov 20 2019 Tokyo, Japan

Mozambique Gas Summit

Nov 20 2019 Maputo, Mozambique


Nov 25 2019 Beijing, China

View all events