Skip to Content
Search by:
38 Articles Found

Analyzing the analyzer— Metrology in gas pipelines

J. Apgar, Contributing Writer, Chino Hills, California  Upstream, gas producers and processors deliver natural gas to fill growing demand for the clean-burning fuel. Downstream, hundreds of miles of pipeline infrastructure deliver the gas to market. In between, at the points of custody transfer, are multitudes of analyzers ensuring that contaminants, such as hydrogen sulfide (H2S), are low enough to protect the pipelines and the public (Fig. 1). This critical measurement prevents corrosion, which, in the worst case, can lead to pipeline rupture. What happens if the gas supplier and user each use a different H2S analyzer? There is a saying in the natural gas industry: “If you have one analyzer, you have a measurement; if you have two analyzers, you have an argument.” Hunter Brown, a measurement control supervisor for Access Midstream, explains this saying: “Sometimes, you will have a …


Analyzers Enhance Plant Efficiencies

HOUSTON–Processing raw natural gas to remove contaminants such as moisture and hydrogen sulfide, and recovering natural gas liquids includes many steps, including using cryogenic fractionation to separate the various hydrocarbons. This cryogenic process demands bonedrygas, with moisture levels below 100 parts per billion. To remove moisture down to such a low level, processing plants pass the gas through vessels containing molecular sieve desiccants, which selectively adsorb the water. Molecular sieves are the solution of choice in many gas processing applications, including the deep dehydrationrequired by natural gas liquid and liquefied natural gas facilities. Molecular sieve dehydration systems typically consist of multiple adsorption beds filled with solid desiccant. The beds are cycled among adsorption, regeneration once the desiccants become saturated (the desiccant bed is heated with hot gas to drive the water off so the molecularsieve is back in its original …


Fluorescence Quenching Eclipses Conventional O2 Measurements in Natural Gas Pipelines

Fast and accurate, new technology offers lower overall operating costs while eliminating erratic performance of maintenance-intensive conventional sensors and the need for scrubbers.


Naizak and SpectraSensors sign MOU to Manufacture TDL Gas Analyser

Naizak Global Engineering Systems and SpectraSensors, Inc of USA signed a Memorandum of Understanding to develop and manufacture the TDL (Tunable Diode Laser) gas analyzers for the Saudi Arabian and the GCC market.   The collective agreement was signed recently in Bahrain between Khalid Al Abdulkarim, President of Naizak, and George Balogh, CEO of SpectraSensors.   SpectraSensors is the leading global provider of laser-based process instrumentation. Naizak is a customer-driven, local services organization with a deliberate policy to invest in people of high caliber and specialization. A large part of that investment is in training nationals and allowing them to participate in our economy.   “The introduction of the TDL gas analyzers in Saudi Arabia and in the GCC through this partnership will boost the productivity and efficiency of the region’s oil and gas sectors,” Abdulkarim said after signing the …


Laser-based analyzer

A new H2O moisture and analyzer technology is available that employs tunable laser diode (TDL) spectroscopy to provide highly accurate and virtually instantaneous measurements of trace amounts of a particular gas (H2O in this instance). By its nature, the TDL based gas detection method is not susceptible to aging affects, making its factory calibration a timeless constant. The result is a very low maintenance analyzer that does not require consumables or scheduled calibration.   TDL-based analyzers have revolutionized the measurement of gases in petrochemical streams such as natural gas. The technology employs a simple measurement that uses a fundamental principle: molecules vibrate when excited by light at specific wavelengths.


TDL-Based Analyzer Eliminates Costly Problems of Inaccurate Acetylene Measurement

Excessive acetylene contaminants in ethylene make that valuable commodity unusable for polyethylene production. Fast, repeatable and dependable, the laser-based analyzer constantly measures acetylene contaminants during ethylene production, assuring high-quality product while eliminating costly waste.


H2S, H2O & CO2 3-Pack gas analyzer system

The SpectraSensors H2S, H2O & CO2 3-Pack gas analyzer systems retain the analytical benefits and reliability known by existing TDL users. Training, support, installation costs, space and overall complexity are reduced by employing one technology for all measurements. The gas measurements are not affected by glycols, methanol or other corrosives. There is no need for light source or probe replacements, no tape, no carrier gas, and no field calibration. The system includes all required sample conditioning and regulation. The sample system is heated to 50°C (122°F) to keep all constituents in vapor phase.


Purifying Ethylene With More Precision

Excessive acetylene contaminants in ethylene make that valuable commodity unusable for polyethylene production. Fast, repeatable and dependable, the laser-based analyzer constantly measures acetylene contaminants during ethylene production, assuring high-quality product while eliminating costly waste.   The purity of ethylene feedstock is critical to the quality of a wide range of petrochemical products, particularly polyethylene plastics. Yet, periodically there are problems when contaminant concentrations exceed stringent purity specifications, rendering valuable ethylene feedstock unacceptable for use in producing such materials. One of the most problematic of those impurities is acetylene (C2H2), which can be difficult to measure accurately using conventional analyzers, and can also drift off spec due to slow analyzer response.   Because it is one of the more problematic contaminants that can spoil ethylene production, acetylene is removed from the ethylene during the purifying process via an acetylene converter unit. …