.Solas 12 .solas chap 12 .solas chapter 12
.bulk carrier
.bulk carrier safety
.bulk safety
Definitions
1. Bulk carrier means the ship which is constructed generally with single deck, top-side tanks and hopper side tanks in cargo spaces and is intended primarily to carry dry cargo in bulk. Ore carriers & combination carriers are also included as bulk carriers.
2 Application
All bulk carriers need to comply with the provisions of this regulation.
4.Damage stability requirements applicable to bulk carriers
1. Single side skin construction bulk carriers which are 150 m in length & above,
→ designed to carry solid bulk cargoes
→ having a cargo density of 1000 kg/m3 and above,
→ constructed on or after 1 July 1999,
→ when these types of bulk carriers loaded up to their summer load line,
→ they need to withstand flooding of any one cargo hold in all loading conditions and
→ remain afloat in a satisfactory condition of equilibrium.
2. Single side skin construction bulk carriers which are of 150m length & above,
→ constructed before 1 July 1999
→ carrying solid bulk cargoes having a density of 1780 kg/m3 and above,
→ when they are loaded up to their summer load line,
→ they need to be able to withstand flooding of the foremost cargo hold in all loading conditions and
→ remain afloat in a satisfactory condition of equilibrium.
3. The permeability of the loaded hold shall be assumed as 0.9 and the permeability of an empty hold shall be assumed as 0.95.
5.Structural strength of bulk carriers
1. (This regulation applies to the bulk carriers constructed on or after 1 July 1999)
Bulk carriers of 150 m in length & above of single side skin construction,
→ designed to carry solid bulk cargoes having a density of 1000 kg/m3 and above,
→ shall have sufficient strength to withstand flooding of any one cargo hold in all loading and ballast conditions,
→ dynamic effects resulting from the presence of water in the hold also need to be considered.
2. (This regulation applies to the bulk carriers constructed before 1 July 1999)
Bulk carriers of 150 m in length & above of single side skin construction,
→ designed to carry solid bulk cargoes having a density of 1780 kg/m3 and above,
→ shall have sufficient strength to withstand flooding of foremost cargo hold in all loading and ballast conditions,
→ dynamic effects resulting from the presence of water in the hold also need to be considered.
6.Structural and other requirements for bulk carriers
(This regulation applies to the bulk carriers constructed before 1 July 1999)
1. Bulk carriers of 150 m in length & above of single side skin construction,
→ carrying solid bulk cargoes having a density of 1780 kg/m3 and above
2. The transverse watertight bulkhead between the two foremost cargo holds and the double bottom of the foremost cargo hold
→ shall have sufficient strength to withstand flooding of the foremost cargo hold,
→ dynamic effects resulting from the presence of water in the hold also need to be considered.
7.Survey of the cargo hold structure of the bulk carriers
(This regulation applies to the bulk carriers constructed before 1 July 1999)
A bulk carrier of 150 m in length & above of single side skin construction, of 10 years of age and over,
→ shall not carry solid bulk cargoes having a density of 1780 kg/m3 & above unless it has satisfactorily undergone either:
1. A periodical survey according to the enhanced survey program of inspections required by regulation XI/2; or
2. A survey of all cargo holds to the same extent as needed for the periodical surveys in the enhanced survey program of inspections required by regulation XI/2.
8.Information on compliance with requirements for bulk carriers
1. The booklet (Trim and stability booklet – Loading Manual) required to carry in a bulk carrier shall be endorsed by the Administration.
2. If a bulk carrier has limitations on the carriage of solid bulk cargoes having a density of 1780 kg/m3 and above, then that bulk carrier needs to be identified and this information need to be recorded in the booklet.
3. A bulk carrier which has limitations on carrying solid bulk cargo of density 1780 kg/m3, needs to be marked on the side shell plate at three positions at amidships, port and starboard. The mark should be a solid equilateral triangle having sides of 500 mm and its apex 300 mm beneath the deck line. The mark needs to be painted with a contrasting colour to that of the hull.
9. Requirements for bulk carriers not being capable of complying with regulation 4.3 due to the design configuration of their cargo holds
- They need to be provided with the bilge well high-water level alarms in all cargo holds, giving an audible and visual alarm on the navigation bridge,
- They need to be provided with the complete information on the particular cargo hold flooding scenarios. These instructions shall be included in “Emergency Preparedness” scenario in safety management system(ISM). This information may also be used in training and drills to train the ship’s crews.
10 Solid bulk cargo density declaration
- Before loading bulk cargo on bulk carriers 150m in length and above, the shipper shall declare the density of the cargo.
- Any cargo declared to have a density 1250 kg/m3 to 1780 kg/m3 shall have its density endorsed by an accredited testing organization.
11 Loading Instrument
- Bulk carriers of 150 m in length & above shall be fitted with a loading instrument capable of providing information on hull girder shear forces and bending moments.
12 Water level detectors in cargo holds
Bulk carriers shall be fitted with the water level detectors in the aft end of each cargo hold. Shall give audible and visual alarms on each occasion when the water level above the inner bottom of cargo hold reaches:
(a) A height of 0.5 metres; and
(b) Whichever is the lower of either:
(i) The height of a point which is not less than(<) 15% of the depth of the cargo hold, or
(ii)A height of two metres.
Water level detectors in ballast tanks
- A water level detector shall be fitted in each forward ballast tank situated forward of collision bulkhead of a bulk carrier. It shall give both an audible and visual alarm when the liquid in the forward ballast tank reaches a level not exceeding 10% of tank capacity.
- A device shall be fitted which overrides the alarm be installed and activated when the forward ballast tank is in use.
Water level detectors in dry or void space
Water level detector shall be fitted in each & every dry or void space of a bulk carrier, any part of which extends forward of the foremost cargo hold, giving an audible & visual alarm at a water depth of 0.1m in that space.
These alarms need not be fitted in the following areas:
(a) a dry/void space which is a chain cable locker; or
(b) in an enclosed space having volume which does not exceed 0.1% of the ship’s maximum displacement volume.
13 Availability of pumping systems:
Pumping system of ballast tanks forward of the collision bulkhead should be such that this can be operated remotely from navigation bridge or engine room.
14 Restrictions from sailing with any hold empty:
Bulk carriers of 150m length and above, single side skin construction,
when they carry cargo having density 1780kg/m3 and above-
and when they reach 10 years of age,
And they cannot withstand flooding in any of the cargo hold,
→ they shall not sail with any cargo hold loaded less than 10% of that hold’s maximum allowable capacity