Section
10 Storage and use of chemicals
10.1 General
10.1.3 Chemical storage tanks are to be protected from excessively high or low
temperatures. Depending on the operational area of the ship, this may necessitate
the fitting of heating and/or cooling systems in accordance with Pt 5, Ch 24, 5.1 General 5.1.4.
10.1.5 Where chemical storage tanks are integrated, the following are to be
considered during the design and construction:
- These tanks shall be designed and constructed as integral part
of the hull (e.g. double bottom, wing tanks);
- These tanks shall be coated with appropriate anti-corrosion
coating or shall be made of adequate corrosion resistant materials;
- These tanks shall be designed and constructed in accordance
with the structural requirements applicable to hull and primary support
members described in Pt 5, Ch 24, 5 Hull construction;
and
- These tanks shall be included in the ship’s stability
calculation.
10.1.8 The chemical storage tank piping and venting systems are to be
independent of other ship service piping and/or systems as defined in Pt 5, Ch 24, 5.1 General 5.1.9.
10.1.9 The chemical storage tank piping systems are not to be located in
accommodation, service spaces or control stations.
10.1.10 Chemical storage tanks are to be of steel or other equivalent material
with a melting point above 925°C and are to be made with a material compatible with
chemical treatment fluids or coated with appropriate anti-corrosion coating.
10.1.11 Where chemical storage tanks are installed in closed compartments, the
compartments are to be served by an effective extraction type mechanical ventilation
system capable of providing not less than six air changes per hour, which is
independent from the ventilation system of accommodation, service spaces or control
stations.
10.1.12 The ventilation system is to be capable of being controlled from outside
the compartment and is to be in continuous operation except when the chemical
storage tank is empty and has been thoroughly ventilated. A warning notice requiring
the use of such ventilation before entering the compartment shall be provided
outside the compartment adjacent to each point of entry.
10.1.13 The vent pipes of the chemical storage tank are to terminate in an area
on the weather deck with no ignition hazard. The tank venting system is to be
arranged to prevent entrance of water into the chemical storage tank.
10.1.14 The chemical storage tanks are to be arranged so that they can be emptied
and ventilated by means of portable or permanent systems.
10.1.15 Where a chemical storage tank is located within an engine room, a
separate ventilation system defined in Pt 5, Ch 24, 10.1 General 10.1.11 is not required when the general ventilation system
for the space is arranged so as to provide an effective movement of air in the
vicinity of the storage tank, and is to be maintained in operation continuously
except when the storage tank is empty and has been thoroughly ventilated.
10.1.16 In the event of a ventilation failure, an audible and visual alarm is to
be provided outside the compartment adjacent to each point of entry and inside the
compartment, together with a warning notice requiring the use of such
ventilation.
10.1.18 For the protection of personnel, the ship is to have suitable personnel
protective equipment on board, including protective clothing, safety boots, gloves,
tight-fitting goggles. The amount of personal protective equipment carried on board
is to be appropriate for the number of personnel engaged in regular handling
operations or that may be exposed in the event of failure. In no case is there to be
less than two sets available on board.s.
10.1.19 The requirements for the ventilation system specified in the paragraphs
Pt 5, Ch 24, 10.1 General 10.1.11
and Pt 5, Ch 24, 10.1 General 10.1.12 also apply to the following closed
compartments normally entered by persons:
- When such closed compartments are adjacent to the integral
chemical storage tanks and there are possible leakage points (e.g. manholes,
fittings) from these tanks.
- When the chemical piping systems pass through such
compartments, unless the piping system is made of steel or other equivalent
material with a melting point above 925°C and with fully welded joints.
10.2 Sodium bicarbonate
10.2.1 Sodium bicarbonate powder shall be stored in a compatible chemical storage tank in a
cool, dry, well-ventilated area away from any incompatible materials such as
acids.
10.3 Ammonia solution
10.3.2 The physical storage conditions recommended by applicable and recognised
standards (such as ISO 18611-3 Ships and marine technology - Marine NOx reduction
agent Aus 40 - Part 3: handling transportation and storage) are to be taken
into account to avoid any impairment of urea solution during storage.
10.3.3 Aqueous ammonia (with a concentration of 28 per cent of ammonia or less by weight)
and anhydrous ammonia (with a concentration of 99,5 per cent of ammonia or greater
by weight) are not to be used as a reductant unless it can be demonstrated that the
use of urea solution is not practicable in which case the requirements for its safe
loading, carriage and use are to be derived from a risk-based analysis. Agreement
from Flag Administration shall also be required for anhydrous ammonia in addition to
the risk-based analysis.
10.3.4 Where chemical storage tanks are integrated, these are to comply with
Pt 5, Ch 24, 10.1 General 10.1.5 and cannot be
located adjacent to any fuel oil and fresh water tank.
10.3.5 The ship is to provide eyewash stations. The location and number of these eyewash
stations is to be derived from the detailed installation arrangements. As a minimum,
the following stations are to be provided:
- in the vicinity of transfer or treatment pump locations. If there are
multiple transfer or treatment pump locations on the same deck then one
eyewash station may be considered for acceptance provided that the station
is easily accessible from all such pump locations on the same deck;
- in the vicinity of a chemical bunkering station on-deck; if the bunkering
connections are located on both port and starboard sides, then consideration
is to be given to providing two eyewash stations, one for each side;
and
- in the vicinity of any part of the system where a spillage/drainage may
occur and in the vicinity of system connections/components that require
periodic maintenance.
10.4 Sodium hydroxide solution (NaOH) or calcium
hydroxide solution (Ca(OH)2)
10.4.1 The aqueous solution of sodium hydroxide (NaOH) or calcium hydroxide
(Ca(OH)2) is commonly used as a chemical treatment fluid for exhaust
gas cleaning system (EGCS), hereinafter referred to as chemical treatment fluid.
Chemical storage tanks that contain chemical treatment fluid are to comply with the
requirements given in Pt 5, Ch 24, 10.1 General 10.1.2 to Pt 5, Ch 24, 10.1 General 10.1.9. For emissions
abatement plant using chemicals other than the above, safety measures are to be
taken according to the result of a risk assessment conducted to analyse the risks,
in order to eliminate or mitigate the hazards to personnel brought by the use of
such systems.
10.4.3 Where chemical treatment fluid is stored in integral tanks, these are to
comply with Pt 5, Ch 24, 10.1 General 10.1.5 and are to be
segregated by cofferdams, void spaces, pump rooms, empty tanks or other similar
spaces so as to not be located adjacent to accommodation, cargo spaces containing
cargoes which react with chemical treatment fluids in a hazardous manner, as well as
any food stores, oil tanks or fresh water tanks.
10.4.4 The ship is to provide eyewash and safety shower stations. The location and number of
these eyewash and safety shower stations are to be derived from the detailed
installation arrangements. As a minimum, the following stations are to be
provided:
- in the vicinity of transfer or treatment pump locations. If there are
multiple transfer or treatment pump locations on the same deck then one
eyewash and safety shower station may be considered for acceptance provided
that the station is easily accessible from all such pump locations on the
same deck;
- in the vicinity of a chemical bunkering station on-deck; if the bunkering
connections are located on both port and starboard sides, then consideration
is to be given to providing two eyewash and safety shower stations, one for
each side; and
- in the vicinity of any part of the system where a spillage/drainage may
occur and in the vicinity of system connections/components that require
periodic maintenance.
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