Michell moisture analysers for monitoring stored natural gas

A moisture analyser from Michell was found suitable for monitoring
moisture levels in stored natural gas by STOGIT, a division of SNAM, the
Italian natural gas transmission and distribution company. Michell’s OptiPEAK
TDL600 moisture analyser demonstrated the necessary fast response and immunity
to methane, resulting in an order for seven units.

The moisture analyser was evaluated over a period of six months at an
underground natural gas storage facility near Milan. Moisture levels at the facility
needed to be monitored and controlled because it had been converted from a
depleted natural gas reservoir. The facility stored excess gas taken from the
regional network during the summer when demand was low, for use during periods
of exceptionally high demand. During storage, the gas absorbs moisture and
needs to be dried to acceptable levels before being pumped into the
transmission network.

Being a challenging application, the moisture analyser needed to ensure
reliability and fast response. Angelo Marconi, of the measurement methods and
processes division at SNAM STOGIT, explained how the OptiPEAK TDL600 performed
during the trial: “The Michell TDL600 performed well throughout our 6-month
evaluation. The optical TDLAS principle of the analyser proved beneficial in
our gas storage application. Very fast measurement response, which is critical
for plant operations when commencing gas export from storage. Also immunity to
interference from methanol, which is a deficiency of our existing analysers.”

The near-infrared spectroscopy measurement technology employed by Michell’s
OptiPEAK TDL600 moisture analysers is not only immune to cross-interference
from methanol, an additive injected to avoid hydrate formation, but also
glycol, a liquid desiccant that is commonly carried through in the export gas
when operating dehydration contactor towers.

Overall, the tuneable diode laser spectroscopy (TDLAS) principle of the
OptiPEAK TDL600 offers the advantage of high-precision measurements combined
with a fast response to changes in process gas moisture content. This makes the
TDL600 an ideal instrument for applications where quick action is needed to
activate dehydration processes if moisture levels in stored natural gas rise
above a certain point.

For further information, please visit the AMS Instrumentation and Calibration website, www.ams-ic.com.au
or call 03-9017 8225, or Freecall (NZ) 0800 442 743.

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