Chapter 1 General
1.1 Application
1.1.1 This Annex applies to offshore support vessels, regardless of size or voyage, that, while not constructed or adapted primarily to carry in bulk cargoes subject to these Guidelines, carry, in limited quantities, the substances identified in 1.2.2. The Annex applies when these cargoes are carried.
1.1.2 For an offshore support vessel the keel of which is laid or which is at a similar stage of construction on or after 19 April 1990, the requirements in Chapters 1 to 6 apply in full. For an offshore support vessel the keel of which is laid or which is at a similar stage of construction prior to 19 April 1990, the Guidelines apply as indicated in Chapter 7.
1.1.3 A vessel irrespective of the date of construction, which is converted for the carriage of bulk liquids subject to these Guidelines on or after the date specified 1.1.2 should be treated as a vessel constructed on the date on which such conversion commences. An existing offshore support vessel which transports a cargo subject to these Guidelines and undergoes modification for the transport of additional cargoes falling under these Guidelines should not be considered as a vessel which has undergone a conversion.
1.1.4 For the purpose of these Guidelines, "limited quantities" means that the aggregate quantity of bulk liquids identified in 1.2.2 that is carried is any amount not exceeding a maximum which is the lesser of 800 m3 or a volume in cubic metres equal to 40% of the vessel's deadweight calculated at a cargo density of 1.0. For ships referred to in 1.3.4.2, such as well-stimulation vessels, the Head of the Shipping Inspectorate may permit carriage of more than the maximum amount specified above.
1.1.5 For other offshore support vessels the Head of the Shipping Inspectorate may permit carriage of more than the relevant maximum amount specified above, provided that the survival capability requirements in Chapter 2 of the Annex to the Notice of Shipping no. 305/1995 or the Notice to Shipping no. 219/1987 or no. 314/1997 are complied with.
1.1.6 This Annex applies only in the case of bulk carriage involving transfer of the cargo to or from its containment which forms part of the vessel or remains on board.
1.1.7 Carriage and handling of dangerous goods and marine pollutants in packaged form should be in accordance with the provisions in the Dangerous Substances Manual and in the International Maritime Dangerous Goods Code.
1.2 Scope
1.2.1 The provisions of this Annex have been developed so that limited quantities of cargoes regulated under this Annex may be carried in bulk with minimum risk to the offshore support vessel, its crew and to the environment.
1.2.2 Products which may be carried subject to this Annex are:
1.2.2.1 those hazardous and noxious liquids listed in appendix 1 and those other products which may be assigned to appendix 1 based on the following criteria;
1.2.2.1.1 Products which for safety reasons may be assigned for carriage on a type 3 ship as defined by the Annex to the Notice to Shipping no. 305/1995 and which are not required to meet the requirements for toxic products in section 15.12 of that Notice;
1.2.2.1.2 Category A, B and C noxious liquid substances which would be permitted for carriage on a type 3 ship;
1.2.1.2 Flammable liquids.
1.2.3 Additives which are considered to fall outside the scope of products in 1.2.2 may be carried in limited amounts in accordance with requirements acceptable to the Head of the Shipping Inspectorate. The aggregate amount of such additives which may be transported should not exceed 10% of the vessel's maximum authorized quantity of products subject to this Annex. An individual tank should contain not more than 10 m3 of these additives. The discharge of these additives into sea from offshore support vessels is prohibited.
1.2.4 Carriage of products not listed in appendix 1 should be undertaken only in accordance with suitable preliminary carriage conditions which are acceptable to the Head of the Shipping Inspectorate, having regard to the criteria for hazard evaluation of bulk chemicals, as indicated in 1.2.2.
1.3 Definitions
Unless expressly provided otherwise, the definitions contained in Chapters 1 and 4 of the Annex to the Notice of Shipping no. 305/1995 apply.
1.3.1 Cargo area:
that part of the offshore support vessel where cargo and cargo vapours are likely to be present and includes cargo tanks, cargo pump-rooms, cofferdams surrounding integral tanks and the following deck areas:
.1 within 3 m of a cargo tank installed on deck;
.2 within 3 m of a cargo tank outlet in case of independent tanks installed below deck;
.3 within 3 m of a cargo tank outlet in case of integral tanks installed below deck and separated from the weather deck by a cofferdam;
.4 the deck area above an integral tank without an overlaying cofferdam plus the deck area extending transversely and longitudinally for a distance of 3 m beyond each side of the tank;
.5 within 3 m of any cargo liquid or vapour pipe, flange, cargo valve, gas or vapour outlet, or entrance or ventilation opening to a cargo pump-room.
1.3.2 Deadweight:
the difference in metric tons between the displacement of an offshore support vessel in water of a density of 1.025 at the load waterline corresponding to the assigned summer freeboard and the lightweight of the ship.
1.3.3 Lightweight:
the displacement of an offshore support vessel in metric tons without cargo, fuel, lubrication oil, ballast water, fresh water and feed water in tanks, consumable stores, and passengers and crew and their effects.
1.3.4 Offshore support vessels are:
.1 vessels wich are primarily engaged in the transport of stores, materials and equipment to and from mobile offshore drilling units, fixed and floating platforms and other similar offshore installations; or
.2 vessels, including well-stimulation vessels, but excluding mobile offshore drilling units, derrick barges, pipelaying barges and floating accommodation units, which are otherwise primarily engaged in supporting the work of offshore installations.
1.3.5 Hazardous substance:
any substance either listed in Chapter 17 of the Annex to the Notice to Shipping no. 305/1995 or having a hazard more severe than one of the minimum hazard criteria given in criteria for hazard evaluation of bulk chemicals as indicated in the 'International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk'.
1.3.6 Noxious liquid substance:
any substance listed as a category A, B, C or D substance and any substance provisionally listed in such categories.
1.3.7 Pollution hazard only substance:
a substance having an entry only of "P" in column d of Chapter 17 of the Annex to the Notice of Shipping no. 305/1995.
1.3.8 Safety hazard substance:
a substance having an entry of "S" or "S/P" in column d in Chapter 17 of the Annex to the Notice of Shipping no. 305/1995.
1.3.9 Flammable liquid:
any liquid having a flashpoint not exceeding 60° C (closed cup test).
1.4 Equivalents
1.4.1 The Head of the Shipping Inspectorate may, contrary to these requirements, allow that any other fitting, material, appliance, apparatus, piece of equipment or a certain type of it is fitted in or carried by a ship or that any particular provision should be made, or any procedure or arrangement should be complied with. In that case it should be proven by trial or otherwise that at least an efficiency as effective as that required by these Guidelines has been achieved. The above does not extend to the substitution of a fitting, material, appliance, apparatus, item of equipment or type thereof required by these Guidelines by operational methods or procedures.
Chapter 3 Ship design
3.01 Cargo segregation
3.1.1 Tanks containing cargo or residues of cargo subject to the provisions of this Notice should be segregated from machinery spaces, propeller shaft tunnels, if fitted, dry cargo spaces, accommodation and service spaces and from drinking water and stores for human consumption, by means of a cofferdam, void space, cargo pump-room, empty tank, oil fuel tank, or other similar space. On-deck stowage of independent tanks or installing independent tanks in otherwise empty hold spaces should be considered as satisfying this requirement.
3.1.2 Cargoes which react in a hazardous manner with other cargoes or oil fuels should:
3.1.2.1 be segregated from such other cargoes or oil fuels by means of a cofferdam, void space, cargo pump-room, empty tank, or a tank containing a mutually compatible cargo;
3.1.2.2 have separate pumping and piping systems which should not pass through other cargo tanks containing such cargoes, unless encased in a tunnel; and
3.1.2.3 have separate tank venting systems.
3.1.3 Cargo piping should not pass through any accommodation, service or machinery space other than cargo pump-rooms or pump-rooms.
3.1.4 Pumps, ballast lines, vent lines and other similar equipment serving permanent ballast tanks should be independent of similar equipment serving cargo tanks.
3.1.5 Bilge pumping arrangements for cargo pump-rooms or for hold spaces in which independent cargo tanks are installed should be situated entirely within the cargo area.
Segregation requirements for integral tanks
3.1.6 Where not bounded by bottom shell plating, fuel oil tanks, a cargo pump-room or a pump-room, the cargo tanks should be surrounded by cofferdams. Tanks for other purposes, except fresh water and lubricating oils, may be accepted as cofferdams for these tanks.
3.1.7 For access to all spaces, the minimum spacing between cargo tank boundaries and adjacent ship's structures should be 600 mm.
3.1.8 Cargo tanks may extend to the deck plating, provided dry cargo is not handled in that area. Where dry cargo is handled on the deck area above a cargo tank, the cargo tank may not extend to the deck plating, unless a continuous, permanent deck sheathing of wood or other suitable material of appropriate thickness and construction is fitted to the satisfaction of the Head of the Shipping Inspectorate.
3.1.9 Cargoes subject to the provisions of this Notice should not be carried in either the fore or aft peak tanks.
3.1.10 For pollution hazard only substances having a flashpoint exceeding 60°C (closed cup test) the Head of the Shipping Inspectorate may waive the arrangements referred to in 3.1.1 and 3.1.3 provided that the segregation requirements for accommodation spaces, drinking water and stores for human consumption are observed. Additionally, 3.1.6 and 3.1.7 need not be applied.
3.02 Accommodation, service and machinery spaces and control stations
3.2.1 Accommodation or service spaces or control stations should not be located within the cargo area.
3.2.2 Unless they are spaced at least 7 m away from the cargo area containing flammable products, entrances, air inlets and openings to accommodation, service and machinery spaces and control stations should not face the cargo area. Doors to spaces not having access to accommodation, service and machinery spaces and control stations, such as cargo control stations and store-rooms, may be situated wihin the 7 m zone specified above, provided the boundaries of the spaces are insulated to A-60 standard. When arranged within the 7 m zone specified above, windows and sidescuttles facing the cargo area should be of a fixed type. Such sidescuttles in the first tier on the main deck should be fitted with inside covers of steel or equivalent material.
3.2.3 In order to guard against the danger of hazardous vapours, due consideration should be given to the location of air intakes and openings to accommodation, service and machinery spaces and control stations in relation to cargo piping and cargo vent systems.
3.2.4 For pollution hazard only substances having a flashpoint exceeding 60°C, the arrangements referred to in 3.2.1 to 3.2.3 may be waived.
3.03 Access to spaces in the cargo area
Access to spaces within the cargo area should meet the requirements of in 3.4 of the Annex to the Notice to Shipping no. 305/1995.
3.04 Cargo tank construction
3.4.1 Cargo tanks should be at least of the type required by Chapter 4 of the Annex to the Notice of Shipping no. 305/1995 or Notice to Shipping no. 219/1987 or no. 314/1997.
3.4.2 Portable tanks meeting the requirements of section 13 of the General Introduction to the International Maritime Dangerous Goods Code for the cargo concerned or other portable tanks specifically approved by the Head of the Shipping Inspectorate may be used, provided that they are properly located and secured to the vessel.
3.4.3 Except for the tank connections to cargo pump-rooms, all tank openings and connections to the tank should terminate above the weather deck and should be located in the tops of the tanks. Where cofferdams are provided over integral tanks, small trunks may be used to penetrate the cofferdam.
3.4.4 The greater of the following design pressures (gauge) should be used for determining scantlings of independent pressure tanks:
. 1 0.7 bar;
. 2 the vapour pressure of the cargo at 45°C;
. 3 the vapour pressure of the cargo at 15°C above the temperature at which it is normally carried; or
. 4 the pressure which occurs in the tank during the loading or unloading.
The design of the tanks should comply with standards acceptable to the Head of the Shipping Inspectorate taking into account the carriage temperature and relative density of cargo.
Due consideration should also be given to dynamic forces and any vacuum pressure to which the tanks may be subjected.
3.4.5 Integral and independent gravity tanks should be constructed and tested according to standards of the Shipping Inspectorate taking into account the carriage temperature and relative density of cargo.
3.4.6 For pollution hazard only substances having a flashpoint exceeding 60 °C, the requirements of 3.4.3. need not be applied.
3.05 Materials of construction
Materials of construction for tanks, piping, fittings and pumps should be in accordance with Chapter 6 of the Annex to the Notice of Shipping no. 305/1995 or, as applicable, of the Notice to Shipping no. 219/1987 or no. 314/1997.
3.06 Cargo tank vent systems
3.6.1 Independent pressure tanks should be fitted with pressure relief devices that are so designed as to direct the discharge away from personnel and that have a set pressure and capacity which is in accordance with standards acceptable to the Head of the Shipping Inspectorate taking into account the design pressure referred to in 3.4.
3.6.2 Cargo tank vent systems of integral or independent gravity tanks should meet the requirements of Chapter 8 of the Annex to the Notice of Shipping no. 305/1995, except that the height specified in 8.2.2 may be reduced to 2 m.
3.6.3 The location of cargo tank vent outlets for independent pressure tanks and for cargo tanks used to carry pollution hazard only substances with a flashpoint exceeding 60 °C (closed cup test) should be to the satisfaction of the Head of the Shipping Inspectorate.
3.6.4 Cargo tank vent systems of portable tanks allowed under 3.4.2 should be to the satisfaction of the Head of the Shipping Inspectorate, taking into account the requirements of 3.6.
3.07 Cargo transfer
3.7.1 The cargo transfer system should comply with the requirements of Chapter 5 of the Annex to the Notice of Shipping no. 305/1995 or Notice to Shipping no. 219/1987 or no. 314/1997, when considered applicable and practical by the Head of the Shipping Inspectorate, taking into account existing industry standards and practices.
3.7.2 The remote shutdown devices for all cargo pumps and similar equipment, required by 5.6.1.3 of the Annex to the Notice of Shipping no. 305/1995, should be capable of being activated from a dedicated cargo control location which is manned at the time of cargo transfer and from at least one other location outside the cargo area and at a safe distance from it.
3.08 Electrical installations
Electrical installations meet the requirements of Chapter 10 of the Annex to the Notice of Shipping no. 305/1995.
3.09 Fire-fighting requirements
3.9.1 For the carriage of flammable liquids identified in appendix 1, the requirements for tankers in Annex IV to the Ships Decree 1965 should apply to all vessels covered by this Notice, irrespective of tonnage and dimensions, except that:
3.9.1.1 regulations 60, 61, 62 and 63 should not be applied;
3.9.1.2 regulation 56, first paragraph, i.e., positioning of machinery spaces aft of cargo tanks, slop tanks, cargo pump-rooms and cofferdams, regulation 56, second paragraph, i.e., the requirements for location of the main cargo control station, as well as regulation 56, fourth and eighth paragraphs, need not be applied. Additionally, regulation 56, seventh paragraph, need not be applied provided that the exterior boundaries of superstructures and deckhouses enclosing accommodation and including overhanging decks which support such accommodation are spaced at least 7 m away from the cargo area. The insulation of such boundaries should, however, be to the satisfaction of the Head of the Shipping Inspectorate;
3.9.1.3 with regard to regulation 57, first paragraph, the Head of the Shipping Inspectorate may permit use of a method other than 1C as defined in regulation 42, paragraph 5.1;
3.9.1.4 the requirements of regulation 44 may be applied in lieu of those in regulation 58, where considered appropriate by the Head of the Shipping Inspectorate;
3.9.1.5 the provisions of regulation 59 need be applied only where considered appropriate by the Head of the Shipping Inspectorate, taking into account the requirement in 3.6.2 of this Annex that cargo tank vent systems should meet the relevant requirements of the Annex to the Notice of Shipping no. 305/1995;
3.9.1.6 regulation 4, as applicable to cargo ships, and regulation 7 should apply as they would apply to tankers of 2,000 tons gross tonnage and over;
3.9.1.7 the provisions of 3.9.2.3 should be applied in lieu of regulation 61; and
3.9.1.8 the provisions of 3.9.2.4 should be applied in lieu of regulation 63.
3.9.2 The following provisions also apply for the carriage of flammable liquids identified in appendix 1:
3.9.2.1 During cargo transfer, water pressure should be maintained on the fire main system.
3.9.2.2 Fire hoses, fitted with approved nozzles should be attached to each fire hydrant in the vicinity of the flammable liquid to be carried.
3.9.2.3 The deck area within the cargo area should be protected by one of the following fire-extinguishing systems:
3.9.2.3.1 a fixed deck foam system complying with the conditions of 11.3.3 to 11.3.12 of the Annex to the Notice to Shipping no. 305/1995. Only foam suitable for the products carried should be used;
3.9.2.3.2 a fixed fire-extinguishing system of the dry chemical type complying with the following should be provided:
.1 if the deck area situated within the cargo area is 45 m2 or less, there are two or more dry chemical extinguishers whose total capacity is not less than 135 kg;
.2 if the deck area situated within the cargo area is 45 m2 or more, there are three or more dry chemical extinguishers whose total capacity of extinguishing agent is not less than:
C = 3A kg,
where A is the deck area in m2;
.3 the minimum rate of supply of the extinguishing agent is not less than 3 kg/min per m2.
3.9.2.4 The cargo pump-room where flammable liquids are handled should be provided with a fixed fire-extinguishing system in accordance with 11.2 of the Annex to the Notice to Shipping no. 305/1995.
3.9.3 For vessels which carry only liquids identified as non-flammable in appendix 1, the fire-fighting requirements should be to the satisfaction of the Head of the Shipping Inspectorate.
3.10 Acid spill protection
3.10.1 Platforms and decks under acid storage tanks and pumps and piping for acid should have a lining or coating of corrosion-resistant material extending up to a minimum height of 500 mm on the bounding bulkheads or coamings. Hatches or other openings in such platforms and decks should be raised to a minimum height of 500 mm, where the Head of the Shipping Inspectorate may allow a lesser height.
3.10.2 Flanges or other detachable pipe connections should be covered by spray shields.
3.10.3 Portable shield covers for connecting the flanges of the loading manifold should be provided. Drip trays of corrosion-resistant material should be provided under loading manifolds for acids.
3.10.4 Spaces for acid storage tanks and acid pumping and piping should be provided with drainage arrangements of corrosion-resistant materials.
3.10.5 Deck spills should be kept away from accommodation and service areas by means of a permanent coaming of suitable height and extension.
3.11 Ventilation of spaces in the cargo area
The requirements of Chapter 12 of the Annex to the Notice of Shipping no. 305/1995 apply. The Head of the Shipping Inspectorate may, however, grant relaxations concerning the distances required in 12.1.5.
3.12 Vapour detection
3.12.1 Vapour detection for the cargoes carried should be provided in accordance with 13.2 of the Annex to the Notice of Shipping no. 305/1995.
3.12.2 Enclosed and semi-enclosed spaces containing installations for acid should be fitted with fixed vapour detection and alarm systems which provide visual and audible indication. The vapour detection systems should be capable of detecting hydrogen except that, in the case where only hydrochloric acid is carried, a hydrogen chloride vapour detection system should be provided.
3.12.3 At least two portable instruments for detecting flammable vapour concentrations should be provided when cargoes subject to this Notice with a flashpoint not exceeding 60 °C (closed cup test) are carried.
3.12.4 At least two portable instruments suitable for measuring the concentration of oxygen in atmospheric air should be provided.
3.13 Special requirements, general
The special requirements for the cargo as referred to in Chapter 17 of the Annex to the Notice of Shipping no. 305/1995 or Chapter 19 of the Notice to Shipping no. 219/1987 or no. 314/1997, are applicable.
However, the requirement in 15.19.6 of the Annex to the Notice of Shipping no. 305/1995 may be waived by the Head of the Shipping Inspectorate taking into account the cargo carriage arrangements and cargo loading procedures.
3.14 Special requirements for the carriage of liquefied gases
3.14.1 Each enclosed space used for handling or storage of a liquefied gas should be fitted with a sensor continuously monitoring the oxygen content of the space and an alarm indicating low oxygen concentration. For semi-enclosed spaces portable equipment may also be acceptable.
3.14.2 Drip trays resistant to cryogenic temperatures should be provided at manifolds transferring liquefied gases or at other flanged connections in the liquefied gas system.
3.14.3 For the carriage of liquid nitrogen the requirements of 17.19 of the Notice to Shipping no. 219/1987 or no. 314/1997 should apply.
3.14.4 The construction of cargo tanks and cargo piping systems for liquefied nitrogen and liquid carbon dioxide should be to the satisfaction of the Head of the Shipping Inspectorate.
3.14.5 Emergency shutoff valves shold be provided in liquid outlet lines from each liquefied gas tank. The controls for the emergency shutoff valves should meet the requirements given in 3.7.2 for remote shutdown devices.
3.15 Gauging and level detection
Each cargo tank should have a level gauging system acceptable to the Head of the Shipping Inspectorate. As a minimum the system should meet relevant requirements of the Annex to the Notice of Shipping no. 305/1995 or the Notice to Shipping no. 219/1988 or no. 314/1997. The systems for process tanks on board well-stimulation vessels should be to the satisfaction of the Head of the Shipping Inspecorate.
3.16 Emergency remote shutdown
In the case of transfer operations involving pressures in excess of 50 bar gauge, arrangements for emergency depressurizing and disconnection of the transfer hose should be provided. The controls for activating emergency depressurization and disconnection of the transfer hose should meet the requirements given in 3.7.2 for remote shutdown devices.
Chapter 4 Pollution requirements
4.1 Each ship certified to carry a noxious liquid substance should be provided with a Cargo Record Book and a Procedures and Arrangements Manual developed for the ship in accordance with the provisions of the Standards (Gov.Gaz. 1996, 41) with the Decree on the Prevention of Pollution by Harmful Liquids Carried in Bulk by Ships, as applicable, and has been approved by the Head of the Shipping Inspectorate.
4.2 Discharge into the sea of category A, B and C noxious liquid substances or ballast water, tank washings, or other residues or mixtures containing noxious liquid, is prohibited. Any discharges of residues and mixtures containing noxious liquid substances should be to reception facilities in port.
As a consequence of this prohibition, the Head of the Shipping Inspectorate may waive the requirements for efficient stripping and underwater discharge arrangements as included in the Decree on the Prevention of Pollution by Harmful Liquids Carried in Bulk by Ships (Gov.Gaz. 1988, 112)
4.3 Residues of category D substances, tank washings, other mixtures or ballast water containing such substances may be discharged into the sea provided that the discharge is in accordance with the relevant conditions in the Decree on the Prevention of Pollution by Harmful Liquids Carried in Bulk by Ships.
4.4 In the case of cargoes regulated by the Decree Prevention Oil Pollution by Ships (Gov.Gaz. 1986, 160) the requirements of that Decree should apply, as applicable.