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PART III
MANDATORY REQUIREMENTS FOR VESSELS
Tank Vessels ^
12. Tank vessels may be repaired when cleaned, or cleaned and inerted, in accordance
with the provisions in sections 17 or 18 respectively; a marine chemist's certificate to
this effect shall be required; repairs or alterations involving hot work shall not be
undertaken unless specifically authorized by the certificate.
Exception 1. Tank vessels may enter a repair yard for examination, afloat or in dry
dock, provided that all bulk cargo compartments and cofferdams are kept closed.
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Exception 2. Tank vessels may enter a repair yard for scraping, washing down and
painting, afloat or in dry dock, provided that all bulk cargo compartments and cofferdams
are kept closed. ^
Exception 3. Tank vessels may enter a repair yard for work (hot or cold) to be
performed outside the vessel, afloat or in dry dock, on the propeller, tailshaft, or
rudder, or for work off the vessel, such as on the anchors or chains, provided that all
bulk cargo compartments and cofferdams are kept closed. ^
Exception 4. Tank vessels may enter a repair yard, afloat or in dry dock, for work
within boiler and machinery spaces and/or other locations provided that, where hot work is
to be undertaken, a marine chemist's certificate is obtained; this certificate shall note
each location for which hot work is approved; all bulk cargo compartments, cofferdams,
and/or other areas where the flammable content of the atmosphere is above 10 percent of
the lower flammable limit shall be kept closed and secured; the securing of the
compartments, cofferdams, and other areas shall be noted on the certificate.^
Exception 5. Tank vessels that proceed to a dry dock or special berth, selected
with due regard to the hazards of the location and to hazards to adjacent property, may
undergo specific limited, local repairs when the compartments or spaces involved and the
adjacent compartments or spaces are prepared as in sections 19 and 20. ^
Requirements for Use of a Special Berthing
Area for Cleaning, Gas Freeing, or Inerting ^
13. (1) Vessels that have not been cleaned, gas-freed, or inerted shall proceed to a
special berth, selected and set apart with due regard to the hazards of the location and
to hazards to adjacent property.
(2) The degassing, cleaning, or inerting shall be carried out as in sections 17 or 18
before vessels are shifted to other berths; no repairs involving hot work, other than in
boiler or machinery spaces when specifically certified by a marine chemist, shall be
undertaken in a special berth until the vessel has been degassed and cleaned or inerted as
in sections 17 or 18; such repairs shall not be undertaken if another vessel, which has
not complied with these requirements, is also in the special berth.
Vessels carrying Flammable Compressed Gas ^
14. On any vessels that have carried flammable compressed gas in bulk, no repairs or
alterations involving hot work shall be made unless the provisions of section 12 have been
met; however, individual pressure tanks inerted in accordance with subsection 7(6), are
considered safe for such work not directly involving these tanks or their pipelines.
Vessels other than Tank Vessels ^
15. On any vessels that have carried flammable or combustible liquids in bulk as fuel
or cargo, or cargoes that may produce hazardous atmospheres (including those of
decomposition or reaction with atmospheric oxygen), no repairs involving hot work shall be
made in or on the external boundaries (shell, tank top, or deck) of cargo tanks, fuel
tanks, oil pipelines, heating coils or hollow structures, and machinery spaces, unless
such compartments and pipelines, as deemed necessary by the marine chemist, have been
cleaned or inerted to meet the appropriate designation requirements of section 7; repairs
and alterations shall not be undertaken until a marine chemist's certificate is obtained.
Electric Welding Operations ^
16. For all electrical welding operations, grounded cables shall be connected to the
ship's structure as close as possible to the point of welding; they shall have a safe
current-carrying capacity equal to or exceeding the specified maximum output capacity of
the unit which they service.
Minimum Requirements for Issuance of a Marine
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Chemist's Certificate
Where a Safe Condition is to be Obtained Entirely by Cleaning (Appendix A)
17. (1) All steam-supplied cargo heater coils shall be made safe by steaming, flushing
with water, blowing with air, or inerting.
(2) All cargo pumps, cargo lines, piped cargo fire extinguishing systems, and vent
lines shall be flushed with water, blown with steam or air, or inerted.
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Exception: Coils in cargo tanks used for chemicals that may react with water or
steam shall be cleaned as in subsection 23(2). |
(3) On vessels using thermal heating coils with flashpoints of 260 degrees Celsius or
above, the marine chemist shall be satisfied of the integrity of these heater coils in the
prescribed work areas.
(4) Compartments shall be cleaned so that the atmosphere in all cargo compartments and
other spaces subject to gas accumulation is in accordance with subsection 7(1) and/or
7(3).
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Exception: Spaces covered by subsection 8(4).
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(5) The residues in all compartments concerned (except for tanks containing combustible
liquids with flashpoints of 93 degrees Celsius or above) shall meet the conditions of
subsection 7(1) and/or 7(3).
(6) Satisfactory compliance with all the foregoing requirements shall be noted on the
marine chemist's certificate.
Where a Safe Condition is to be Obtained by both Cleaning and Inerting or Entirely by
Inerting (Appendix A).
18. (1) The marine chemist shall approve the use of the inerting medium; he shall
personally supervise introduction of the inerting medium into the space, except where the
inerting medium has been introduced before the vessel arrived at the repair facility; the
marine chemist always shall personally conduct tests to determine that the oxygen content
of the inerted space is at or below 8 percent, or 50 percent of the amount required to
support combustion, whichever is least; the marine chemist shall be readily available
during the entire period of work, and he shall determine that the oxygen level in the
inerted space is maintained at or below 8 percent or 50 percent of the amount required to
support combustion, whichever is least; the marine chemist shall supervise the safe
disposal or securing of the inerting medium after completion of the repair work on the
inerted space and adjacent spaces.
(2) All steam-supplied cargo heater coils shall be made safe by steaming, flushing with
water, blowing with air, or inerting; all piped cargo fire extinguishing systems within
the cargo tanks and vent lines, except those in the inerted spaces, shall be flushed with
water, blown with steam or air, or inerted; all valves to the inerted spaces shall be
tagged and secured so as to avoid accidental opening or operation; all cargo pumps and
cargo lines shall be flushed with water, blown with steam or air, or inerted.
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Exception 1: Coils to cargo tanks used for chemicals that may react with water
or steam shall be cleaned as in subsection 23(2).
Exception 2: on coiled vessels using thermal heating oils with flashpoints of
260 degrees Celsius or above, the marine chemist shall be satisfied of the integrity of
the heater coils in the prescribed work areas.
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(3) All spaces to be inerted shall be sufficiently intact to retain the inerting
medium; all valves, hatches and other openings to the inerted spaces, except those
controlling the inerting medium, shall be closed and secured.
(4) All access openings to an inerted space shall be appropriately labelled with a
warning sign ² Not Safe for Workers²
that shall remain in place throughout the course of repairs.
(5) Compartments or spaces in which internal repairs or alterations are to be
undertaken shall be cleaned to comply with the requirements of section 17 and all other
spaces (except for tanks containing combustible liquids with flashpoints of 93 degrees
Celsius or above) shall be inerted as in subsection 7(5) or 7(6).
(6) Compartments or spaces on which external repairs or alterations are to be
undertaken on the external boundaries (deck or shell) may be inerted by gas instead of
being cleaned as described in section 18; all other spaces (except for tanks containing
combustible liquids with flashpoints of 93 degrees Celsius or above) shall be inerted as
in subsection 7(5) or 7(6).
(7) Satisfactory compliance with all the foregoing requirements shall be noted on the
marine chemist's certificate.
Where a Safe Condition is to be Obtained Entirely by Cleaning Certain Compartments and
by Securing the Others (Appendix A).
19. (1) Nonadjacent spaces containing atmospheres exceeding 10 percent of the lower
flammable limit shall be secured, and those spaces noted on the marine chemist's
certificate.
(2) All steam-supplied cargo heater coils to the spaces involved shall have been made
safe by steaming, flushing with water, blowing with air, or inerting; all piped cargo fire
extinguishing systems and vent lines to the spaces involved shall be flushed with water,
blown with steam or air, or inerted; valves to all other compartments shall be closed and
secured; all cargo pumps and cargo lines shall have been flushed with water, blown with
steam or air, or inerted, and the valves closed and secured so as to avoid accidental
opening or operation.
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Exception 1: Coils in cargo tanks used for chemicals that may react with water
or steam shall be cleaned as in subsection 23(2).
Exception 2: On coiled vessels using thermal heating oils with flashpoints of
260 degrees Celsius or above, the marine chemist shall be satisfied of the integrity of
the heater coils in the prescribed work areas.
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(3) Compartments or spaces in which internal repairs or alterations are to be
undertaken, and all adjacent compartments (including those diagonally adjacent) shall be
cleaned as in section 17; all other applicable spaces shall be closed and secured so as to
avoid accidental opening or operation.
(4) Satisfactory compliance with all the foregoing requirements shall be noted on the
marine chemist's certificate.
Where a Safe Condition is to be Obtained by both Cleaning and Inerting or Entirely by
Inerting Certain Compartments and by Securing the Others (Appendix A).
20. (1) All steam-supplied cargo heater coils to the spaces involved, except those to
the inerted spaces, shall be rade safe by steaming, flushing with water, blowing with air,
or inerting; all piped cargo fire extinguishing systems and vent lines to the spaces
involved, except those to the inerted spaces, shall be flushed with water, blown with
steam or air, or inerted; the valves to all other compartments shall be closed and secured
so as to avoid accidental opening or operation; all cargo pumps and cargo lines shall be
flushed with water, blown with steam or air, or inerted: the valves shall be closed and
secured so as to avoid accidental opening or operation.
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Exception 1: Coils in cargo tanks used for chemicals that may react with water
or steam shall be cleaned as in subsection 23(2).
Exception 2: On coiled vessels using thermal heating oils with flashpoints of
260 degrees Celsius or above, the marine chemist shall be satisfied of the integrity of
the heater coils in the prescribed work areas.
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(2) Nonadjacent spaces containing atmospheres exceeding 10 percent of the lower
flammable limit shall be closed and secured so as to avoid accidental opening or
operation, and those spaces noted on the marine chemist's certificate.
(3) Compartments or spaces in which internal repairs or alterations are to be
undertaken shall be cleaned to comply with the requirements of section 17; all adjacent
compartments, including those diagonally adjacent, shall be inerted as in subsection 7(5);
all other compartments shall be closed and secured as in subsection 19(1).
(4) Compartments or spaces on which external repairs or alterations are to be
undertaken on the external boundaries (deck or shell) may be inerted by gas instead of
being cleaned as described in section 17; all adjacent compartments, including those
diagonally adjacent shall be inerted or cleaned as in section 18; all other applicable
spaces shall be closed and secured as in subsection 19(1).
(5) Satisfactory compliance with all the foregoing requirements shall be noted on the
marine chemist's certificate.
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