Emerson FISHER Yarway AT-13/23 Serviceanleitung Handbuch - Seite 6
Blättern Sie online oder laden Sie pdf Serviceanleitung Handbuch für Industrielle Ausrüstung Emerson FISHER Yarway AT-13/23 herunter. Emerson FISHER Yarway AT-13/23 10 Seiten. Quetemp standard and heavy duty
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YarwaY Que - TeMp desuperheaTer sTandard-/heavy duTy
InstallatIon and maIntenance InstructIons
Body extension: only for class 150 (pn 25/40)
and class 300 (pn 64) (see figure 6)
examine the threading on the body extension,
dressing where necessary, with a small
file. If care is exercised, during routine
maintenance, the valve body extension should
never require any repair work. If this threading
does become accidentally damaged, however,
then weld repair may be possible. It should be
noted that this job is for a specialist welder and
filler materials must be compatible with both
the base material and the service conditions.
In the event that such work is necessary,
please consult yarway for further advice.
FIgure 6
version 'tack welded' for class 150 (pn 25/40) and class 300 (pn 64)
spray cylinder
•
area lapped before assembly
FIgure 7
version 'circular welded' for class 600 (pn 100) up to and including class 2500 (pn 400).
see 'Inspection procedure' further on.
spray cylinder
•
FIgure 8
equally spaced
deTaIls:
Min. 8 mm
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.
reassemble the spray cylinder onto the body
extension. use a fine grade polishing paste
to lap the seating area of cylinder and body
extension. The seal is metal to metal so a
concentric seat area is vital. always use a new
fastener ring. set the spray cylinder into the
correct orientation (the water spray should
always be in the same direction as the steam
flow) and tighten the fastener ring.
Fastener ring
Tack welds
•
•
Tack welds
Circular weld
•
1.7335
Body extension
1.4006
Body extension
•
Body extension
•
Tack (3)
Tack (1)
Tack (2)
Tack (4)
tack welding
after reassembly, the spray cylinder should
be tack welded or circular welded for added
security. It is essential that this welding is
carried out by a competent welder. a Welding
procedure specification is available from
yarway, upon request. Both TIg and arC
welding methods are acceptable and the
recommended electrode material is er
niCrMo3. a minimum of two 8 mm long tacks
are required, diametrically opposite, with
one weld securing the fastener ring to the
body extension, the other securing the spray
cylinder to the fastener ring. after welding,
use a suitable dye penetrant method to
check the weld.
no cracks are permitted. If necessary,
grind-off, re-check until a satisfactory weld
is obtained (see Figure 8).
Before re-installing the Que - Temp
desuperheater, make sure that the connecting
flange faces are cleaned thoroughly and
any gasketting material removed. Insert
the Que - Temp desuperheater into the
steam pipework and check that the nozzle
is orientated correctly with the spray in 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.
Follow the procedure for 'start-up', as detailed
earlier in the installation instructions. Check
the flange tightness.
4