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.
