New flow switch for relief valve leak monitoring in gas facilities

AMS Instrumentation and Calibration has introduced a
new flow switch designed to provide a reliable solution for relief valve leak
monitoring in natural gas fractionation process facilities.

The new FlexSwitch FLT93 Series flow switches from Fluid Components International (FCI) will assist
process and plant engineers responsible for the safety of natural gas
fractionation processes keep their facilities safe without the inconvenience of
false alarms that interrupt operations, upset plant employees and require
additional paperwork and meetings to report and resolve.

CSG fractionation process facilities separate ethane, propane, butane
and other heavier hydrocarbons from mixed CSG streams. Multiple trains and
columns are typically used in a fractional distillation process, with relief
valves installed as critical safety protection devices that release when needed
to prevent pressure from building within the process. A flow switch is
typically installed after the pressure relief valve and sounds an alarm if
there is flow.

For the CSG fractionation process to work efficiently and safely, the
operation requires early and reliable indication when a relief valve leaks or
lifts during an overpressure situation. If gas is being released through the pressure
relief valve, the flow switch will indicate to plant engineers via a dry
contact that there is an event in progress. Appropriate corrective action is
then taken to resolve the event.

FCI’s highly accurate and dependable inline FLT93L flow switch is ideal
for relief valve leak monitoring in natural gas fractionation applications. The
FLT93L is a heavy duty thermal dispersion flow/ level/ temperature switch based
on FCI’s 50-plus years of experience.

Key features include an all-welded thermal sensor suitable for both
gases and hydrocarbon-based liquids; advanced electronic control circuit, which
is field configurable to satisfy any combination of application requirements;
voltage output allowing the user to accurately set the desired trip point; delta
range between the two RTDs providing a span for setting the switch trip points;
flexible dual relays settable for any combination of flow, level and/or
temperature alarms; standard flow accuracy of ±2% of setpoint velocity over a
±50¡F (±28¡C) temperature range meeting the needs of the application; and repeatability
of ±0.5% reading enabling dependable, reliable operation in relief valve leak

All FLT93 Series flow switches are temperature compensated to ensure
accuracy under rugged petrochemical plant operating conditions.

The absence of moving parts ensures
exceptional safety and long lifespan for thermal flow switches. FLT93 Series flow switches have a long instrument life with
an MTBF of 190 years, and a low lifecycle cost with low maintenance requirements.

Also SIL-2 rated for ultra-reliability, the
FLT93L switch offers Ex agency approvals including FM, FMc, ATEX, IECEx, Inmetro
and TR CU. A fail-safe, dual alarm (SPDT) control circuit is integrated with FLT93
switch’s thermal flow sensor for field flexibility and user friendliness.

Dual independent heavy duty 6A SPDT relays in
the control circuit provide multiple alarm combinations. They can be set for
flow rate and temperature, high flow and low flow, point level and temperature,
flow rate and low liquid level, three-phase interface or fail-safe flow, level
or temperature.

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

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