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MCSC Electrical and Instrumentation Division
BAPCO 1&2CDU, 1VDU, NRC T&I and LSFO Catalyst Change Shutdown Nov-Dec 2018
MCSC completed major repair and maintenance work in BAPCO 1&2CDU, 1VDU, NRC T&I and LSFO Catalyst Change Shutdownduring the periodNov–Dec, 2018. The peak manpower was 282 Nos. and Total Man-Hours worked were 87,523.
No. 1&2CDU (Columns - 8 Nos., Vessels - 11 Nos.)
No. 1VDU (Columns - 2 Nos., Vessels - 4 Nos.)
No. 1H2 (Furnace - 1 No., Exchangers - 4 No’s, Vessels - 4 Nos.)
No. 2HDU (Exchangers - 12 Nos., FinFans - 6 Nos., Vessels - 1 No.)
NRC (Columns - 3 Nos., Vessels - 13 Nos.)
1C1 MAIN COLUMN:
120 Sq.Ft. CS Lining Panels were installed above Tray-27 as per RED recommendations.
2” Redundant Nozzle was eliminated with insert plate and hydro-tested.
Reflux Distributor Pipe above Tray-28 was observed to be corroded all along the header; fabricated and replaced the complete Distributor Pipe.
1C6 MAIN COLUMN:
Deck7 was renewed in kind including down comer as per Engineering PTO.
Thermosyphon N26D renewed as per Engineering PTO.
Deck 6 Tray Support Ring was repaired as per RED Inspection Work list.
Deck 31 and 32 Tray Segments were repaired as per RED Inspection Work list.
8” Nozzle above Deck 7 was repaired by providing sleeve inside the Nozzle.
2C1 MAIN COLUMN:
Existing Demister Pad in the top section was removed and was replaced with new Demister Pad.
3” Dead Leg Nozzle at the column bottom section was eliminated, insert plate was hydro tested by using Test Cap Method as per Engineering PTO.
2” BSGO Nozzle was replaced as per RED Inspection Work list.
8” Vacuum Residue Line renewed including nozzles N5, N6 & N7 along with the Reinforcement Pad.
2C2 CONTACT CONDENSER:
Detached shell to sieve tray’s areas was grinded and re- welded for decks 5, 6, 7 & 8.
60 Sq.Ft. Lining Panels were installed inside columns as per RED Inspection Work list.
64E6425X WASTE HEAT BOILER & COLD COLLECTOR:
Hot Spot found on Existing Refractory in Cone Area of the Waste Heat Boiler at south side near Cold Collector Flange renewed with New Anchors and Refractory.
8C501 RERUN MAIN COLUMN:
6” Redundant Nozzle was blanked off from inside by welding insert plate as per RED Inspection Work list.
8C502 STABILIZER MAIN COLUMN:
Corroded Top man-way gasket faces were repaired by weld build up and face machining.
6” Vapor line outlet nozzle section inside the column was renewed as per RED Inspection Work listand Engineering Drawings.
SS Lining Panel on the bottom man-way was arced out and renewed in kind.
8C503 DEBUTANIZER MAIN COLUMN:
3” Reflux Line from Column top head to ground level connecting flange was renewed as per RED Inspection Work listand Engineering Drawings.