guidance-2

FURTHERMORE, SPECIFICATION FOR OIL/WATER INTERFACE DETECTORS RESOLUTION MEPC.5(XIII) STATES ;
"RECOMMENDS GOVERNMENTS TO USE THESE SPECIFICATIONS WHEN CONSIDERING INTERFACE DETECTORS FOR APPROVAL AND TO REPORT TO THE ORGANIZATION ON APPROVED EQUIPMENT FOR CIRCULATION TO ITS MEMBERS."
o ISGOTT 7.2, MEASURING AND SAMPLING
[7.2.1 GENERAL, CLOSED GAUGING AND SAMPLING BY USING PORTABLE EQUIPMENT]

CARGO LIQUID SAMPLE IS REQUIRED ON BOARD FOR ANALYZATION OF CARGO. FOR CARGO LIQUID SAMPLING, "CLOSED SAMPLING" FACILITY ON DECK IS REQUIRED, AND THIS CAN BE ACHIEVED ON TANK GAUGING STATION (VAPOR LOCKS) INSTALLED ON DECK.
[OCIMF VESSEL PARTICULARS QUESTIONNAIRE FOR OIL/CHEMICAL CARRIER 8.50 (1ST-EDITION-1997) STATES; "ARE CLOSED SAMPLING DEVICES ON BOARD?"]
o ISGOTT 7.2, MEASURING AND SAMPLING
[7.2.1 GENERAL, CLOSED GAUGING AND SAMPLING BY USING PORTABLE EQUIPMENT]

THE IMO REQUIREMENT ON TANKER SAFETY AND POLLUTION PREVENTION, IMO MARPOL 1973/78 1978-RESOLUTION A. 446(XI) 4.4.4. STATES "MEANS SUCH AS LEVEL GAUGES, HAND DIPPING, AND STRIPPING SYSTEM PERFORMANCE GAUGES AS REFERRED TO IN PARAGRAPH 4.4.8 SHALL BE PROVIDED FOR CHECKING THAT THE BOTTOMS OF CARGO TANKS ARE DRY AFTER THE CRUDE OIL WASHING. SUITABLE ARRANGEMENTS FOR HAND DIPPING MUST BE PROVIDED AT THE AFTER-MOST PORTION OF A CARGO TANK AND IN THREE OTHER SUITABLE LOCATIONS UNLESS OTHER APPROVED MEANS ARE FITTED FOR EFFICIENTLY ASCERTAINING THAT THE BOTTOM OF EVERY CARGO TANK IS DRY."

THE IMO REQUIREMENT ON TANKER SAFETY AND POLLUTION PREVENTION, ANNEX I - REGULATION 13B(3) STATES "AN INERT GAS SYSTEM SHALL BE PROVIDED IN EVERY CARGO TANK AND SLOP TANK IN ACCORDANCE WITH THE APPROPRIATE REGULATIONS OF CHAPTER II-2 OF THE INTERNATIONAL CONVENTION FOR THE SAFETY OF LIFE AT SEA (SOLAS), 1974, AS MODIFIED AND ADDED TO BY THE PROTOCOL OF 1978 RELATING TO THE INTERNATIONAL CONVENTION FOR THE SAFETY OF LIFE AT SEA, 1974, AND AS MAY BE FURTHER AMENDED."

(AND) 1983-AMENDMENT TO THE INTERNATIONAL CONVENTION FOR THE SOLAS, 1974, REGULATION 62 (INERT GAS SYSTEMS) PARAGRAPH 17 STATES "PORTABLE INSTRUMENTS FOR MEASURING OXYGEN AND FLAMMABLE VAPOUR CONCENTRATION SHALL BE PROVIDED. IN ADDITION, SUITABLE ARRANGEMENT SHALL BE MADE ON EACH CARGO TANK SUCH THAT THE CONDITION OF THE TANK ATMOSPHERE CAN BE DETERMINED USING THESE PORTABLE INSTRUMENTS."

(AND) 1978 ｭ RESOLUTION A.446(XI), 6.6 (USE AND CONTROL OF INERT GAS) STATES "BEFORE EACH TANK IS CRUDE OIL WASHED, THE OXYGEN LEVEL SHALL BE DETERMINED AT A POINT 1 METRE FROM THE DECK AND AT THE MIDDLE REGION OF THE ULLAGE SPACE AND NEITHER OF THESE DETERMINATIONS SHALL EXCEED 8 PER CENT BY VOLUME.
DURING CRUDE OIL WASHING:
(a) THE OXYGEN LEVEL OF THE INERT GAS BEING DELIVERED EXCEEDS 8 PER CENT BY VOLUME; OR
(b) THE PRESSURE OF THE ATMOSPHERE AT THE TANKS IS NO LONGER POSITIVE;
THEN THE WASHING MUST BE STOPPED UNTIL SATISFACTORY CONDITIONS ARE RESTORED."