Emerson Yarway TempLowHT User manual

MODEL 59/69/79
ATTENTION WHEN PUTTING INTO OPERATION
Readjust ‘Stuffing box’ immediately as required
(see separate section). Leakage is out of guarantee.
YARWAY TempLowHT DESUPERHEATER
InstallatIon and MaIntenance InstructIons
UNPACKING
The Yarway TempLowHT Desuperheater is
packed with the greatest of care in wooden
boxes or cartons for protection during handling
and transit to site. After hydrostatic testing,
the TempLowHT Desuperhater is flushed
through with a high grade of preservative to
protect machined and internal surfaces from
corrosion. If it is found, however, that damage
has occurred during shipment, then this should
be reported immediately to your forwarder or
Yarway representative.
Particular care should be taken when removing
the TempLowHT Desuperheater from its packing
and your special attention is required to check
carefully that no damage has occurred to flange
faces, threading, actuators, connecting pipes, etc.
(See figure 1).
INSTALLATION OF THE TempLowHT
DESUPERHEATER
Before installation, check the TempLowHT
Desuperheater, actuator and accessories for any
visible damage.
Check that the information on the documentation,
identification plate and tag number complies with
the order specification. Remove the TempLowHT
Desuperheater carefully from its packaging,
liftingby means of straps around the body.
Do not use the water inlet 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 gasket onto the mounting flange
and carefully insert the nozzle into the branch
pipe. Ensure that the spray cylinder is pointed
with the direction of the steam flow before
tightening the mounting bolts (see figure 3).
NOTE
The TempLowHT Desuperheaters should be installed
free of ‘forces, moments and torques’.
Before installation these instructions must be fully read and understood
© 2017 Emerson. All Rights Reserved.Emerson.com/FinalControl VCIOM-03239-EN 18/04
The TempLowHT Desuperheater is provided
with a standard lower body length, as specified
in the contract drawing and the mounting
branch for the steam pipework must be
manufactured to suit. The length of this branch
should be such, that the centerline of the spray
cylinder is located on the centerline of the
steam pipe (± 5 mm).
The mounting branch should be 3” (DN 80) for
Model 59, 4” (DN 100) for Model 69 and 5” (DN125)
for Model 79 nominal bore, maximum pipe
schedule 160 for clearance purposes (check the
applicable power piping code). Check the certified
drawing for flange details.
RECOMMENDATIONS
(acid cleaning ofsteam boilers)
Remove TempLowHT Desuperheaters from
thepiping prior to acid cleaning!

2
HWW HWN HWE HWS
FP9 FP12 FP3 FP6
FIGURE 4
FIGURE 3
Water flange positions
Steam line Steam flow
Handwheel positions
Steam line Steam flow
Air
Air
Water
Steam
YARWAY TempLowHT DESUPERHEATER
InstallatIon and MaIntenance InstructIons
The minimum pipe run, required downstream
of the TempLowHT Desuperheater, varies
with each individual application and would
be specified by Yarway at the enquiry stage.
This straight run is needed to prevent erosion
due to impingement of water droplets against
pipewalls, valves and fittings and is normally
Item Description
1Temperature sensor
2Temperature transmitter
3Temperature controller
4TempLowHT Desuperheater
5Air filter regulator
6Safety relief valve
7Strainer
8Check valve
9Flange
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 sensor is nominally 12to
15meters, although the distance specific to
theapplication would be advised by Yarway at
the enquirystage. Longerdistances will ensure
that full evaporation of the water will take place
at lowersteam velocities.
The temperature sensor should be located in
the upper half of the pipe, avoid branching of
the steam pipework between the TempLowHT
Desuperheater and the sensor (see figure 4).

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).

4
A
B
FIGURE 7
YARWAY TempLowHT DESUPERHEATER
InstallatIon and MaIntenance InstructIons
Disassembly (see figure 10)
The TempLowHT Desuperheater can
be disassembled, most easily when in
thehorizontal position with the body extension
section clamped firmly in the vice.
Remove nuts (16) and detach injection probe (7).
Inspect the water channels of the injection
probe by either a torch or an endoscopic
device. Check the condition of the nozzles(17).
Allparts shall be free of cracks. In case of
doubt apply a dye check method for more
accurate inspection.
Check the condition of the bolts and
nuts(15, 16). Threading should show no galling
or deterioration. If they do, discard of and
replace by new parts. Discard of gasket (5)
which shall be replaced by a new one.
Remove the stuffing box stud, nuts (13, 14) and
gland plate (10). Remove gland bushing (12).
If(12, 10) are in good condition, free of scoring
or pitting they can be re-used.
Install the upperbody (1) on a solid working
table and have an opening at the flange side
sufficiently large to allow the control cylinder
assembly (3) to be pressed out of the body (1).
There is considerable friction from the seal(4).
Use a wooden bloc or other protection on
thetreaded end of stem (6).
Push the stem all the way down till it sits on
thebottom of cylinder (3).
Use a deadweight hammer to drive the
cylinder/stem (3, 6) out of the body (1). Discard
of packing (4). Make sure the index pin (8) is not
damaged at this operation.
Turn the body (1) upside down and inspect the
seat (2). Seat shall be free of scratches, wire
drawing and pitting. If in good condition the
seat 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 machinery.
It is imperative that safety glasses and protective work
wear 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 TempLowHT Desuperheater
from the system, ensure that both the
steam -and water- 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 steam flange and water
flange bolting, but vent connections before
complete removal.
The TempLowHT Desuperheater may now be
removed from the system. It is recommended
that the TempLowHT 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 TempLowHT 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.
Remove actuator and yoke before commencing
disassembly of the TempLowHT valve.

5
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•• • • • •
•
FIGURE 8 - MODELS 59/69/79
FIGURE 9
Metal wire reinforced graphite
fibers (markedwith white dot)
Gland
Spacer Braided pure expanded graphite
Metal wire reinforced graphite
fibers (marked with white dot)
Spacer
Gland
Braided pure expanded graphite
YARWAY TempLowHT DESUPERHEATER
InstallatIon and MaIntenance InstructIons
Control cylinder assembly (3)
Once removed, inspect the condition of
thecylinder internally, using a flashlight.
Scratches and blemishes may be removed by
either polishing or honing.
The cylinder bore should not exceed
a maximum eccentricity of 0.25 mm.
Debriscanbe removed from the drillings
byblowing through with compressed air.
Carefully clean the cylinder inside and outside,
dressing where necessary, with a small file.
Injection probe (7)
Inspect as outlined above, clean all drillings
with compressed air. Make sure the recess
for gasket (5) is thoroughly cleaned. Check if
the counter drilling for index pin (8) is free of
blemishes. If not, 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 disassembled. Take care not to overstress
thepiston rings when fitting. The rings are
marked ‘top’ and should always point in
the direction of the stuffing box, for proper
functioning. Examine the condition of the stem,
where it runs in the stuffing box, removeany
graphite with a fine grade emery cloth,
polishing in the longitudinal direction.
Stuffing box parts (10, 11, 12)
Remove all rings, lantern ring and packing
material from the valve body. Clean the stuffing
box carefully, using a rotating wire brush
and/or honing device. Cleanless of the packing
area is
vital for proper valve sealing. Do not
use grease or lubricants in combination with
graphite packing!
Only ever use genuine Yarway
components, as they are supplied as matched
sets (see under paragraph ‘Packing set’).

6
Reassembly
Before reassembling the valve, lubricate all
threads with a suitable high temperature nickel
compound. Do not use grease or
other oil based
lubricants as these may lead to dismantling
problems later. Apply a thin coating of
thecompound to the piston rings to prevent
scoring. Position the slots in the piston rings,
such that they are at 120° to each other.
If the seat has been removed, thoroughly
clean the area for seal ring (19) in both
thecontrol cylinder assy (3) and the seat (2).
Check thecondition of the threading, remove
blemishes and or damaged threading by
dressing with a small, fine file. In case of doubt,
insert the seat part first with no seal ring (19)
installed. If the insertion is flawless remove and
install seat ring (19).
The seal shall have grip in the seat groove
sufficiently for re-assembly. Never usegrease
or other substance to fix the seal ring.
Putthestem with piston-rings in the control
cylinder. Screw the seat with the seal inserted
carefully on the control cylinder, hand tighten.
Use a wrench to tighten the seat on the control
cylinder (both parts need to have metal surface
contact). Setting torque for model 59/69 is 400Nm,
model 79 is 650Nm.
YARWAY TempLowHT DESUPERHEATER
InstallatIon and MaIntenance InstructIons
Packing set
CAUTION
Before repacking any valve, make sure all
safety precautions are taken as applicable
totheparticular valve being serviced.
1. Completely remove old packing including
any spares, washers or lantern rings,
ifany. Make sure that surfaces contacting
packing are clean. Inspect the stuffing box
and stem for straightness, wear, scratches,
pitting and other abnormalities which would
prevent establishment of a good seal around
the packing. A smooth undamaged surface
is essential for good sealing. Repair or
replace as necessary.
2. If a spacer is supplied with this packing or
if
a spacer was removed from the stuffing
box, make sure it is installed first. If one end of
thespacer is chamfered, install chamfered end
down so that it sits at bottom of stuffing box.
3. Packing is supplied as a complete set and
rings should be in same order as packaged
in the set. Install packing set in correct
order, see figure 9/10.
4. Check packing rings for proper fit.
Theyshould be push fit into stuffing box.
5. Install one ring at a time, in the proper
sequence, using a packing driver or gland
bushing. Facing must be seated individually
with a packing driver. Pre-compression
of each ring 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 (if present) on each
successive ring 120° apart.
7. Do not over compress the packing.
Theamount of compression should be
only that which is required to the install
thecorrect number of rings into thestuffing
box. Compression of the packing in a
partially filled stuffing box, to make room for
the rest of the packing, can be accomplished
using the gland bushing and taking up on
the gland nuts.
8. When all packing has been installed in
thestuffing box and the gland bushing
and packing flange are in place, tighten
thegland
nuts evenly with a wrench to seat
and compress the complete packing set
to the stuffing box and stem. Compress
thepacking set enough to cause the packing
slightly to grip the stem (if stem movement
is performed by hand, the stem should not
move). If the stem moves with stick slip,
thepacking set is over-tightened.
9. Re-tightening of the gland nuts is necessary
within a few hours after start-up. During this
operation timeit may be necessary to adjust
the gland nuts. Check regularly.
Next operation is best performed with the
body(1) in horizontal position.
Insert spacer (11) in the stuffing box cavity.
Itwill act as a stem guide.
Install seal (4) over control cylinder assy (3)
and push the cylinder /stem combination into
thecavity of body (1). Make sure the stem
smoothly slides in the bushing (11).
Turn the body with the mounting flange upward.
Take care not to damage the stem.
Press onto the cylinder (3) by light hammering
with a deadweight hammer, or under a press
until the edge of cylinder (3) is flat with the lower
flange face. Protect the face of the cylinder
by a
piece of lead, copper or wood to avoid scratches
or dents on the facing.
Insert index pin (8) and slide gasket (5)
over thepin and match up the drillings in
thecylinder bottom.
Re-assembly the injection probe (7) by
means of the studs/nuts (15, 16). Tighten
nuts with approx. 30 Nm.Check if the flat face
between body (1) and injection probe (7) has
no clearance. If it does let rest for approx
10minutes and re-tighten.
Follow the stuffing box assembly procedure
asoutlined above.
Depending upon the built-in situation
theactuator can now be re-assembled or
later,once the TempLowHT is back in situ.
The unit is now ready for re-mounting to
thepiping system.

7
INSPECTION PROCEDURE
Seat (2) and all gaskets and packing (4, 5, 19, 9)
are standard wear parts.
The materials selected for the valve
components are such that they do cope
with
theconditions as found on applications in steam/
water environments. Thermal cycling does occur
and users should realize that thetemperature
differentials at Desuperheaters are usually
thehighest found in the Plant. It is recommended
to check the spray nozzles (17) and the injection
probe (7) after one year of service.
At the inspection, by use of dye check or fluor
penetrant investigation, these parts shall be
checked for cracks. Parts with hair crack
STORAGE PROCEDURE
Upon receipt, check both the TempLowHT
Desuperheater and the packing case
for any transit damage. Any damage to
theTempLowHT Desuperheater should be
reported immediately to Yarway or their local
agent. Any damage to the packing container
should be rectified to prevent theingress of
dust or water, prior to placing the equipment
into storage.
Check the information contained on
the identification plate - tag plate and
documentation and return the unit to its
packing with protective covers in place.
For short term storage, up to 6 months
duration, no additional preservation measures
are necessary. Retain the unit in its original
packing in a clean, dry indoor location. If outdoor
storage is unavoidable, then the packing case
should be enclosed in a waterproof covering.
YARWAY TempLowHT DESUPERHEATER
InstallatIon and MaIntenance InstructIons
Re-installation
Refit the actuator onto the TempLowHT
Desuperheater, referring to the notes taken
during disassembly, for re-setting the stem
position. If the actuator is electric, check that
the limits switches are functioning correctly by
manual operation of the unit. Set at mid-stroke
before applying power and verify that opening
and closing directions are correct and
correspond with system logics.
Before re-installing the TempLowHT
Desuperheater, make sure that the connecting
flange faces are cleaned thoroughly
and any gasketting material removed.
InserttheTempLowHT Desuperheater into
thesteam pipework and check that the nozzle
is orientated correctly with the 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 when ordering spare parts.
For cross-sectional drawings and part lists,
seethe next pages.
Follow the procedure for ‘start-up’, as
detailed earlier in the installation instructions.
Checktheflange and stuffing box tightness. Do not
overtighten the stuffing box packing gland as this
may prevent proper TempLowHT Desuperheater
operation. In the event of persistent leakage
through the stem packing, the unit should be
removed to the workshop, for further examination.
Experience shows that providing the stuffing box,
packing and stem are clean and smooth, leak-free
tightness can be achieved. Tighten stuffing box by
evenly turning the gland plate nuts.
indications shall not be re-used. ‘Defect free’
parts in such installations shall be inspected
once per 2 year of operation.
It is advised to replace the above mentioned
components at least once per 5 years of
service. Taking these precautions has
historically proven to give reliable service.
NOTE
Injection probe and nozzles are made specifically
forthe specification. Delivery time of such components
will be 10-12 weeks on average.
For long term storage use only a dry indoor
location. Remove the stem packing and ensure
that the TempLowHT Desuperheater is dry
and free from moisture. Apply a cosmoline
type grease to machined faces, valve stem
and stuffing box. Retain the TempLowHT
Desuperheater in its original packing and
inspect at 3 monthly intervals to ensure that
nodeterioration has occurred.
Before placing the TempLowHT Desuperheater
into service, replace stem packing and
inspect other components, such as actuator,
seals, etc., to ensure correct functioning.
Followtheprocedure for installation as
detailed in the operating and maintenance
instructionmanual.
NOTE
Materials and data of units supplied, may deviated
from this Instruction Manual. Please consult order
documents in case of doubt.
The TempLowHT Desuperheater is classified
under European Directive 97/23/EC under
category I with CE-marking.

8
25 •
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23 •
27 • 26
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9
13 14
22
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24
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18 •
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4
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7
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5
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17
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3
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1516
•
8
YARWAY TempLowHT DESUPERHEATER
InstallatIon and MaIntenance InstructIons
FIGURE 10
MODEL 59
NOTES
* See certified drawing
• Recommended spare part
Materials and data of units supplied, may deviate from this brochure.
Pleaseconsult order documents in case of doubt.
Certification
TempLowHT Desuperheaters are approved by authorized authorities to comply with
the requirements of ASME B16.34 and EN. All data are subject to change.
PARTS LIST
Item Quantity Name Material
11Body A182 F91 / F22*
2• 1Seat Stellite 6/17% Cr*
3• 1Control cylinder assembly AISI 431
4• 1Seal SS/graphite
5• 1Gasket SS/graphite
6• 1Stem incl. piston AISI 431 nitrited
7• 1Injection probe A182 F91 / F22*
8• 1Pin, spray cylinder AISI 304
9• 1Packing, set Graphite
10• 1Gland, packing AISI 304
11• 1Bushing, spacer AISI 431 nitrited
12• 1Bushing, gland AISI 431 nitrited
13 4Stud, packing gland A193 B16
14 4Nut, packing gland A194 4H
15• 16 Stud, injection probe A193 B16
16• 32 Nut, injection probe A194 4H
17 *Nozzle Inconel 718
18 1Name plate AISI 304
19• 1Seal ring SS/graphite
20• 1Lock nut C-Steel
21 1Coupling C-Steel
22 1Water flange A182 F91 / F22*
23 1Yoke C-steel
24• 3Piston ring AISI 431 nitrited
25 1Actuator
26 1Positioner
27 1Air filter regulator
Trademark
Stellite®is a registered trademark of Deloro Stellite.

9
12
9
21
13 14
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22
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•
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19
24
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4
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7
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5
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23 •
27 •
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26
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11
6
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15
16
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20
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1•
•
18 •
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8
2
PARTS LIST
Item Quantity Name Material
1 1 Body A182 F91 / F22*
2• 1Seat Stellite 6/17% Cr*
3• 1Control cylinder assembly AISI 431
4• 1Seal SS/graphite
5• 1Gasket SS/graphite
6• 1Stem incl. piston AISI 431 nitrited
7• 1Injection probe A182 F91 / F22*
8• 1Pin, spray cylinder AISI 304
9• 1Packing, set Graphite
10• 1Gland, packing AISI 304
11• 1Bushing, spacer AISI 431 nitrited
12• 1Bushing, gland AISI 431 nitrited
13 4Stud, packing gland A193 B16
14 4Nut, packing gland A194 4H
15• 8Stud, injection probe A193 B16
16• 8Nut, injection probe A194 4H
17 *Nozzle Inconel 718
18 1Name plate AISI 304
19• 1Seal ring SS/graphite
20• 1Lock nut C-Steel
21 1Coupling C-Steel
22 1Water flange A182 F91 / F22*
23 1Yoke C-steel
24• 3Piston ring AISI 431 nitrited
25 1Actuator
26 1Positioner
27 1Air filter regulator
FIGURE 11
MODEL 69/79
NOTES
* See certified drawing
• Recommended spare part
Materials and data of units supplied, may deviate from this brochure.
Pleaseconsult order documents in case of doubt.
Certification
TempLowHT Desuperheaters are approved by authorized authorities to comply with
the requirements of ASME B16.34 and EN. All data are subject to change.
YARWAY TempLowHT DESUPERHEATER
InstallatIon and MaIntenance InstructIons
Trademark
Stellite®is a registered trademark of DeloroStellite.

10
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Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Yarway is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson
and the Emerson 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 their use or applicability. All sales are governed by
our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without
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