AMS announces new fast responding moisture analyser for stored natural gas

AMS Instrumentation and Calibration announces the launch of a new range
of moisture analysers designed to ensure quality in stored natural gas.

Michell’s new OptiPEAK TDL600 moisture analyser is based on a fast
response and non-contact spectroscopic measurement principle that enables gas
storage companies to not only meet demand quickly but also satisfy the
contractual standards for moisture content when stored natural gas is withdrawn
and pumped into the pipeline network.

Gas storage is integral to the natural gas industry to ensure
uninterrupted supply to consumers. Gas is usually stored underground, in
depleted gas reservoirs, aquifers or salt caverns. The water dew-point
temperature or moisture content of the stored gas is measured during the
filling (pressurisation) and usage (de-pressurisation) cycles. Storage
pressures of up to 30 MPa require the gas to be very dry to prevent
condensation.

Since underground storage facilities are used to meet demand in peak
periods and are usually non-active during the summer, there is potential for
moisture content to rise above acceptable levels during the inactive period. A reliable
hygrometer is, therefore, vital to check for moisture when gas needs to be
taken from storage.

Additionally, instrumentation has been observed to fail from exposure to
aggressive compounds and harmful contamination, which may occur when there is
no flow through the analyser. During these inactive periods, a corrosive, stale
sample may sit in the analyser for many weeks. Decommissioning is not an option
as little notice will be given for the withdrawal of the stored gas.

Designed to overcome these shortcomings, Michell’s OptiPEAK TDL600
moisture analysers feature a non-contact tuneable diode laser technology that
ensures none of the sensing components is subjected to the gas stream, while
being protected from the aggressive compounds and harmful contamination that
would cause failure in other analysers.

The OptiPEAK TDL600 additionally
offers a class-leading measurement accuracy of 1ppmv to support the rapid
ramp-up in gas supply from the storage facility into the network. This means the
analyser can respond to changes in moisture content in 2-3 seconds, allowing
fast action to be taken to ensure continued supply.

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