Refinery - II M&I SD Oct-Nov 2018

Minor pitting throughout the internal surface was noticed.
Weld build up at deeply pitted area was carried out. Thickness gauging was done and a minimum thickness of 8.0
mm & 10.1 mm was recorded against the original thickness of 8.0 mm & 10.0 mm on shell & dished end
respectively.
Recommendations
Anticipate weld repair on shell pitted locations.
4.3.10 14-C-10 WASTE WATER STRIPPER
Height mm
Diameter
mm
4600 305
The 12” hand hole was opened and offered for inspection.
Minor pitting throughout the internals surface was noticed.
Fire proofing was found damaged.
New rasching packing was provided as per PE. Thickness gauging was done and a minimum thickness of 9.3 mm
& 9.1 mm was recorded against the original thickness of 9.53 mm on shell & dished end respectively.
Recommendations
Renew the damaged fire proofing of vessel skirt.
4.3.11 14-C-11 SUMP DRUM
Length
mm
Diameter
mm
Equipment was replaced completely.
No. of
Hand hole
1
(12”-150#)
No. of
manways
After erection, water level was checked and found acceptable. Thickness gauging was done and a minimum
thickness of 8.6 mm & 13.4 mm was recorded against the original thickness of 8.0 mm & 14.0 mm on shell &
dished end respectively. The new vessel was painted as per the CPCL painting system X.
4.3.12 14-C-12 CONDENSATE BLOWDOWN DRUM
Details of internals Ref. Drg. No. Test Pressure
Ceramic Raschet Ring
1773-14-00-HM –
D016
3.0 Kg/cm 2 (g)
Details of internals Ref. Drg. No. Test Pressure
4060 1300 01 --- 12-B-09 8.0 Kg/cm 2 (g)
Length
mm
Chennai Petroleum Corporation Limited (A group company of Indian Oil)
Technical - Inspection
Diameter
mm
No. of
manways
12685 1300 2
Details of internals Ref. Drg. No. Test Pressure
Ring tray and cone tray
14 nos
1773-14-11-B-010 3 Kg/cm 2
Equipment was replaced completely.
Weld build up was carried on foundation bolts at corrode
locations. After erection water level was checked and found
acceptable.
Level gauge stand pipe (2”) and bottom drain pipeline (6”)
were replaced. Newly fabricated monkey ladder was replaced.
14-C-12: Anchor Bolt Weld Repair & DPT
Recommendations
Skirt fire proofing of vessel shall be done in the next available opporutunity.
Modification may be made in internal arrangement of donut trays and disc trays for easy dismantling and
removal.
4.3.13 14-C-13 MIBK STORAGE TANK
Length
mm
Diameter
mm
No. of
Manways
The MIBK storage tank was not released for M&I shutdown as in the last M&I, Since used solvent was stored.
Tank thickness gauging was done and a minimum thickness of 7.5 mm was observed against original thickness of
8.0 mm.
Recommendations
Tank shall be released online for internal inspection & Maintenance.
4.3.14 14-C-14 SLOP AND FOOTS OIL MIX TANK
Details of internals Ref. Drg. No. Test Pressure
4880 3050 1 ----- C-157 -----
Height
mm
Diameter
mm
Chennai Petroleum Corporation Limited (A group company of Indian Oil)
No. of
Manways
Technical - Inspection
Details of internals Ref. Drg. No. Test Pressure
880 3005 1 (18” -150#) ----- C-158 Water fill test
Tank was taken for internal inspection & maintenance as a part of pre-shutdown activity. Tank shell and roof
manways were opened and sludge was removed manually.
On initial inspection, the tank shell, bottom plate and roof plate underside were found with thick corrosion
scale.
After cleaning, the shell plate at bottom course was found to have low thickness and also severe pitting corrosion
was observed all over the shell course plate, bottom plate and roof plate.
WAX DEOILING UNIT &
HYDROFINISHING UNIT
562
Refinery - II M&I S/D Oct-Nov 2018 - Inspection Report
Refinery - II M&I S/D Oct-Nov 2018 - Inspection Report
563