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YarwaY A.T.-Temp CryogeniC desuperheATer sTAndArd duTy
InstallatIon and MaIntenance InstructIons
start-Up
ensure that all components are installed
correctly. Connection of electrical supplies and
instrument air piping should be in accordance
with the manufacturer's instruction manual.
Verify and adjust, if necessary, set points for
filter regulators and valve positioners, following
the manufacturer's recommendations.
similarly, calibrate the temperature
transmitter/controller, verifying automatic
response to temperature changes.
Check the liquid pressure at the A.T.-Temp
Cryogenic desuperheater. Verify the operation
of the temperature transmitter and controller
by manually increasing and decreasing the
output signal and observing indicated and
recorded temperatures.
When satisfactory coordination between
instrument signals and temperature are
attained, adjustment of the set point can be
made and the system transferred to automatic
operation.
it is recommended to record the various
process coordinates, over a sustained period, to
verify operation, adjusting where necessary.
Figure 7
Figure 8
spray cylinder
Area lapped before assembly
maintenance
note: maintenance of the A.T.-Temp
Cryogenic desuperheater is straight forward
and does not require any special tools or
training. Care should be taken during any
maintenance operation, particularly when
working with grinders, compressed air and
rotating machinery. it is imperative that safety
glasses and protective workwear are used in
accordance with standard safety procedures.
in case of doubt, consult your supervisor or
safety officer before commencing any work
on the equipment.
removal
Before removing the A.T.-Temp Cryogenic
desuperheater from the system, ensure that
both the process -and injection liquid pipework
are pressureless and vented.
isolate any electrical supplies to the actuator
and/or ancillaries, prior to disconnection.
Vent and remove instrument air supply piping.
Loosen process flange and liquid flange bolting,
but vent connections before complete removal.
Tack welds
Fastener ring
Body extension
Tack welds
The A.T.-Temp Cryogenic desuperheater
may now be removed from the system. it is
recommended that the A.T.-Temp Cryogenic
desuperheater is transported to a convenient
workshop which has a workbench and vice. Lift
the unit by means of straps around the body.
do not attempt to lift the A.T.-Temp Cryogenic
desuperheater by the yoke, actuator or any of
its accessories.
depending upon the type of actuator fitted,
various stem couplings are used. measure
accurately, and record the dimensions
A and B (see Figure 7) for reassembly
purposes. Also record positions of any levers
or specials fixings, sketching if necessary,
prior to removal. if any work is required on
the actuator, then please refer to the actuator
manufacturer's manual.
4
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