Brochure

QUALIFYING MATERIALS
Equipment constructed from a
material incompatible with the
process environment may damage
operating equipment or cause a
plant shutdown.
Fisher material technologies offer a
significant reliability improvement
over generic grades. Material
formulations are developed,
specified, and controlled for metals,
elastomers, and plastics in Fisher
control valves.
A fully-equipped materials lab is
staffed by Emerson technologists
who verify that materials
and coatings will perform to
expectations physically and
mechanically. If materials and
suppliers do not meet our stringent
standards, they are rejected.
Emerson technologists are industry
leaders, developing new global
standards and identifying new
materials that will solve difficult
customer problems. They are the
ones the industry turns to when
materials don’t perform as expected.
PROTECTING COMPRESSORS
In order to operate more efficiently, liquefied natural gas
plants prefer to run turbo compressors close to the surge
limit line. The margin for error to avoid equipment damage
during surge events is very narrow.
Antisurge valves must be responsive in order to protect
critical and costly compressors from damage during
transients. They also must be accurate to allow operation at
peak efficiency.
Technologies incorporated in Fisher antisurge valves are
unmatched by any other manufacturer. Fisher precision
actuation technology enables a full stroke up to 50.8 cm
(20 in) in less than one second and better than 1%
positioning accuracy for even very large control valves.
Setup and tuning can be performed remotely and in
minutes. Without Fisher technology it can take hours.
Factory acceptance testing to Fisher specification FGS 4L11
typically eliminates the need for any tuning changes after
installation.
Fisher digital valve controllers use special, antisurge-
specific control and tuning algorithms for robust, stable,
high performance control.
The FGS 4L11 factory acceptance test is becoming an LNG
industry standard. This performance standard is being
applied to critical process control in all industries.
Elastomers are highly
documented as the
cause of downtime
in plants. Off-the-shelf
elastomers cannot
meet climate extremes
and require extensive
qualification. Dynamic
mechanical analysis
has been performed
on each Fisher
elastomer formulation
to investigate the high
and low temperature.
6 | Fisher
®
Technology Development