3
tc
tt
FIgure 6
FIgure 5
safety valve
Check valve
strainer
YArwAY
TemplowHT desuperHeaTer
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.
Warm the steam main and open the
valve in the water supply. Check the
water pressure at the TemplowHT
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 steam
coordinates, over a sustained period, to verify
operation, adjusting where necessary.
pipe bends should always be of the long radius
type to assist in keeping the water droplets in
suspension, until complete evaporation has
taken place. Installation may be in vertical or
horizontal piping, but the direction of water
injection should always be with the steam flow.
The TemplowHT desuperheater may be
mounted at 90° to the steam pipe, for all steam
flow orientations, but avoid installation in
the vertically downwards position, wherever
possible (see figure 5).
Yarway supplies the TemplowHT
desuperheater as follows:
Identification number:
xx. 59. xxxxx - Forged type with 3” (dN 80)
mounting flange
xx. 69. xxxxx - Forged type with 4” (dN 100)
mounting flange
xx. 79. xxxxx - Forged type with 5” (dN 125)
mounting flange
note
Horizontal orientated TemplowHT desuperheater has
to be installed with a support for weight compensation.
The water supply should be of a good quality;
clean and filtered, for example boiler feed
water and should have a constant pressure as
specified in the order documents. each water
supply line should be protected with its own
individual strainer with a maximum element
perforation size of 0.1 mm (0.4 mm acceptable
for nozzles ‘e’ size and up).
Where there are positive shut-off components
in the water supply (including electric actuators)
then a safety relief valve of an approved type
should be fitted. as in the case of the steam
pipework, use gasketing and bolting in
accordance with the relevant piping code.
Flush out the water line before connecting
to the TemplowHT desuperheater mounting
flange (see figure 6).
