Post on 14-Apr-2018
transcript
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WELCOME ALL
By
Production Team
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Cryogenic
Gas to liquid at sub (minus) temperature
LIN/LOX/LAR
Best e.g.. Jet fuel
Heat transfer
(conduction/convection/radiation)
Methodology - vaccum insulation/thermalinsulation
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Cryogenic Vessels
VIST- Vaccum insulated storage tank
VITT- Vaccum insulated transported tank
VIET- Vaccum insulated evaporated tank
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VIST- Vaccum insulated storage
tank
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VITT- Vaccum insulated
transported tank
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VIET- Vaccum insulated
evaporated tank
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Importance of the vessels
service
Process (gas formation/temp maint)
Life timeCost
Rework
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Vessel orientation
View from top
Deg in clock wise direction view from top
Deg in anti clock wise direction view frombottom
If looking from Top view top dish is shape
as a convex and bottom dish as aconcave.
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Vessel orientation
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View from bottom anti clock wise
Pipe lines out
Vaccum filter
180 deg
90
deg
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SS cleaning
Initially apply Bondite Liquid and remove the
yellow marks/stains by using SS wire brush
After that Okite Liquid to be apply for protection
Next Bondite Liquid to be apply once again, froth& Foam develops followed by scrubbing the
stains using wire brush and wait for 15-
20minutes.
Finally wash the Stainless steel plate by Okite
Liquid
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SS cleaning
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Patch plate fitup with vessel
Bottom dish end with outer skirt fitupand welding can be done before patch
plate assemble with inner vessel.
Jacket dish end Assy fitup with innervessel.
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Jacket Dish with Inner vessel
assembly
Tan line
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Patch plate
Patch plate fitup with jacket bottom dish
end and the center line of the patch plate
should be match with the bottom dish endcenter line i.e. 180 deg.
Temporary attachment can be done
between patch plate with jacket bottomdish end (in the form of cantilever ).
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Patch plate with jacket dish
assembly
Both are should
be in same axis
Temporary
support
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Pipe support with inner vessel
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Pipe support with inner vessel
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Individual Pipe connection
Pipe connection to be made with help of adaptor asshown in fig (socket type joint)
If we want butt joint, we have to take 100% RT
We should maintain 1.5mm 3mm gab between pipe
and adaptor for thermal expansion Pipe with adaptor and ferrules Mock up to done before fit
up& welding
Assemble the pipe from both side of top dish end as well
as patch plate. adjust the length of pipe andmarking/cutting to required size in shell length wise andalso marking/cutting the excess length of pipe from topdish end side.
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Individual Pipe connection
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Individual Pipe connection
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Individual Pipe connection
After complete the mock up clean the
inside of both ferrules and pipe by DCE-
dry chloride ethylene.
Welding sequence of the pipe in fig
Gap between Pipelines and Inner vessel
should be 1 to 1.1/2
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Individual Pipe connection
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CLAMP FOR PIPE
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Hydro test
Vessel should be in Horizontal Position
Inlet on flange connection pipe
Slightly inclined the vessels during hydrotest
For water Drain, all ferrrules should be in open condition Pressure gauge on N' at 180 degree and Drain on N at 0
Mild steel ferrule for Dummy the threaded ferrules
If Non-ferrous material is available, it is best.
Proper insulation to be provide between MS and SS
Air block to be remove from all pipes
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Hydro test
During hydrotest, vessel upclined
During Drain, vessel Declined
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Hydro test
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Hydro test
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N&N closing
During hydro test, plug N & N' by tapping
Taffelon tape
After hydrotest, remove taffelon tape and
weld.
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Pneumatic test
Pnuematic test to be done before N & N'
welding
Two Pressure Gauges
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Jacket assembly
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Jacket assembly
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Jacket assembly
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Jacket assembly
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Jacket assembly
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Jacket assembly
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Evacuation Filter Assembly
If we making continuous length pipe, we
have to cut the Dummy end because of
getting continuous hollow from end to end.
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Vaccum Probe connection
Vacuum probe pipe to be inserted in the
Jacket Dish nearby half of its length.
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Evacuation Filter Assembly
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Evacuation Filter Assembly
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Evacuation Filter Assembly
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Evacuation Filter Assembly
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Evacuation Filter Assembly
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Evacuation Filter Assembly
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Evacuation Filter Assembly
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Evacuation Filter Assembly
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Evacuation Filter Assembly
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Evacuation Filter Assembly