BOC Cryogenic Vessels-1

7/30/2019 BOC Cryogenic Vessels-1

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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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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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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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BOC Cryogenic Vessels-1

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