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FIgure 6

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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).

Summary of Contents for Yarway TempLowHT

Page 1: ...connection yoke actuator or any of its accessories for lifting Leave the flange covers in place during transportation until ready to install in the pipework Warning The hoisting lug is for the actuator only NOT for a total assembly When installing the TempLowHT Desuperheater use gaskets and bolting material in accordance with the relevant piping code for example ASME B31 1 or AD 2000 EN Place the ...

Page 2: ...rature controller 4 TempLowHT Desuperheater 5 Air filter regulator 6 Safety relief valve 7 Strainer 8 Check valve 9 Flange 10 E P positioner Figure 1 Model 59 69 79 Check for damages Identification plate Check for damages Check for damages in the order of 4 to 6 meters as a minimum no upstream straight length is normally required The distance from the TempLowHT Desuperheater to the temperature sen...

Page 3: ...er 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 supplie...

Page 4: ... can remain in situ If damaged use a pipe wrench and unscrew the seat counterclockwise Discard of metallic seal ring 19 This ring cannot be re used Maintenance Note Maintenance of the TempLowHT 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...

Page 5: ... dress with a fine file Nozzles 17 may be replaceable If this is wanted check with Yarway for possibilities as special PWHT may be required at this operation Stem 6 Withdraw the piston stem The piston and stem are always supplied as a complete assembly If the piston shows no signs of wear and tear then it may be re used Replace piston rings as a matter of course any time that the unit is disassemb...

Page 6: ...ing during installation is very important for the tightness of the seal Do not use screwdriver or other sharp object to seal the packing This could damage the packing and or stem If a packing driver is used make sure that the diametrical clearances between the I D of the driver and O D of the stem and the O D of the driver and I D of the stuffing box do not exceed 0 5 mm 0 020 6 Stagger the joints...

Page 7: ...e spray with the direction of the steam flow Apply a high temperature lubricating compound to the bolts and nuts and tighten evenly in accordance with the manufacturer s recommendations Before connecting the water line flush through and check for any contamination or restriction in the supply Spare parts Make sure that the identification number indicated on the nameplate is verified and specified ...

Page 8: ... 17 Cr 3 1 Control cylinder assembly AISI 431 4 1 Seal SS graphite 5 1 Gasket SS graphite 6 1 Stem incl piston AISI 431 nitrited 7 1 Injection probe A182 F91 F22 8 1 Pin spray cylinder AISI 304 9 1 Packing set Graphite 10 1 Gland packing AISI 304 11 1 Bushing spacer AISI 431 nitrited 12 1 Bushing gland AISI 431 nitrited 13 4 Stud packing gland A193 B16 14 4 Nut packing gland A194 4H 15 16 Stud inj...

Page 9: ...6 8 Nut injection probe A194 4H 17 Nozzle Inconel 718 18 1 Name plate AISI 304 19 1 Seal ring SS graphite 20 1 Lock nut C Steel 21 1 Coupling C Steel 22 1 Water flange A182 F91 F22 23 1 Yoke C steel 24 3 Piston ring AISI 431 nitrited 25 1 Actuator 26 1 Positioner 27 1 Air filter regulator Figure 11 model 69 79 Notes See certified drawing Recommended spare part Materials and data of units supplied ...

Page 10: ...son logo are trademarks and service marks of Emerson Electric Co All other marks are the property of their respective owners The contents of this publication are presented for informational purposes only and while every effort has been made to ensure their accuracy they are not to be construed as warranties or guarantees express or implied regarding the products or services described herein or the...

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