CHAPTER 1 GENERAL
1.1 General
1.1.1 General principles for lay-up
A ship put out of commission for a certain period may be subject to specific requirements for maintenance of class, as specified below, provided that the Owner notifies CR Classification Society (hereinafter referred to as "the Society") of the fact. If the Owner is to submit a lay-up scheme to the Society for review, the normal survey requirements may no longer apply to the laid-up ship. Where the Owner does not notify the Society of the lay-up of the ship or does not implement the lay-up scheme, the ship’s class may be suspended and/or withdrawn when the due surveys are not carried out by the validate date on the Certificate of Classification.
1.1.2 Lay-up scheme
The lay-up scheme provides for a “Initial lay-up survey” to be performed at the beginning of lay-up and subsequent
"annual lay-up surveys" and "renewal lay-up survey" to be performed in lieu of the normal annual surveys and special surveys as long as the ship remains laid-up. The minimum content of the lay-up scheme as well as the scope of these surveys are given in 1.2, chapter 2 and 3.
The other periodical surveys which become overdue during the lay-up period may be postponed until the re-commissioning of the ship. Where the ship has a reviewed lay-up scheme and its period of class expires, the period of class is extended until it is re-commissioned, subject to the satisfactory completion of the annual lay-up surveys and the renewal lay-up survey as described in 3.1.2 and 3.1.3.
Documents of the lay-up scheme submitted to the Society for review shall at least include following:
(a) Preservation measures and maintenance plan for hull, machinery and electrical installaion
(b) Lay-up site and mooring arrangement
(c) Fire protection and firefighting installation
(d) Protection against explosion
(e) Lay-up manning and security plan
(f) Safety equipment
(g) Power availability and emergency power
1.1.3 Re-commissioning
The surveys carried out during the lay-up period may be credited, either wholly or in part, at the discretion of the Society, having particular regard to their extent and dates. These surveys will be taken into account for the determination of the extent of surveys required for the re-commissioning of the ship and/or the expiry dates of the next periodical surveys of the same type. When a ship intends to re-commissioning, the Owner is to notify the Society and make provisions for the ship to be submitted to the re-commissioning survey. The scope of survey depending on the duration of the lay-up period is to be determined prior to the commencement of re-commissioning survey.
Where the previous period of class expired before the re-commissioning and was extended as stated in 1.1.2, a complete class renewal survey is included in re-commissioning survey and to be carried out prior to re-commissioning. Those items which have been surveyed in compliance with the class renewal survey requirements during the 15 months
CHAPTER 1 GENERAL
In order to maintain its class during a normal operation period, a ship is to be submitted to the surveys described in Part I of CR Rules for Steel Ships at their due dates and to the satisfaction of the Society, and is to be free of overdue surveys and conditions of class during the considered period. When a ship stops trading and is put out of commission for a certain period, i.e. is laid-up, the normal survey requirements may no longer apply provided that the Owner notifies the Society of this fact.
The choice and suitability of the lay-up site, the type of mooring conditions, the mooring arrangements and their efficiency, power availability, lay-up manning, fire protecion and safety equipment during the lay-up period remain the responsibility of the Owner. However, at the Owner’s request, the mooring arrangement may be reviewed by the Society.
1.2.2 Lay-up site
The following recommendations are to be considered by Owners regarding the choice and suitability of the lay-up site.
The site should be:
- sheltered from open sea, strong currents and waves
- not exposed to whirling winds or turbulent tidal waves
- not exposed to moving ice
- clear of corrosive waste waters
- provided with adequate ship/shore communications.
1.2.3 Mooring arrangements
The following recommendations are to be considered by Owners with respect to the mooring arrangements:
- ground holding should be adequate
- vessels laid-up to buoys or anchored should be moored in such a way as to be prevented from swinging with normal wind and tidal changes
- chain cables should not be subject to cross-contact or twisting and stern anchorage should generally be provided
- laid-up ships should be in ballast condition in order to reduce the effects of wind. Due consideration should be given to the still water bending moment. For guidance, normal ballast draft should be roughly between 30% and 50% of the maximum draft.
Ships should normally be moored singly. However, when several ships are moored together, the following provisions are to be made:
- ships are to be moored bow to stern
CHAPTER 1 GENERAL 1.2 Requirements for Lay-up
- ships are to be of approximately the same size
- the number of ships moored together is, in principle, not to exceed six
- breast-lines are to be of similar elasticity
- fenders are to be provided.
1.2.4 Reveiw of the mooring arrangements
The mooring arrangements may be reviewed by the Society as owner request. The proposal for the mooring arrangements is in such case to be submitted by the Owner and is to include the following information.
(a) Mooring site:
- geographical area (to be specified on a map) - characteristics of the sea bottom
- water depth
- preferential angular sectors (effects of wind / tide / current) indicated according to statistical studies - wave characteristics (amplitude, periods)
(b) Geometry of mooring arrangements:
- ship’s position and direction - shore anchorage
- diagram showing mooring equipment (fore and aft) - angle between chain cables and ship’s centreline
(c) Characteristics of mooring equipment:
- maximum holding strength of each anchor
- type of mooring lines (chains, cables, sinkers, etc.) - length of each section
- weight of each section
- mechanical characteristics of each section (breaking load) - weight of sinkers.
1.2.5 Power availability and emergency power
Adequate power supply is to be supplied, or readily available, all around the clock, either from independent means on board the ship or from shore. The following safety conditions are to be kept throughout the lay-up period.
The emergency source of power, emergency generator and/or emergency air compressor are to be kept in working order and tested weekly.
1.2.6 Lay-up manning
Watch personnel are to be provided. The number of the watch personnel will depend on the size of the ship, the lay-up site and mooring arrangements, the shore assistance available in case of fire, leakage or flooding, the maintenance required to provide adequate preservation. A permanent shore communication installation (radio, telephone) is also to be available.
1.2.7 Fire protection and firefighting arrangement The following is to be complied with:
CHAPTER 1 GENERAL 1.2 Requirements for Lay-up
CR Classification Society GUIDELINES FOR LAY-UP OF SHIPS GD-LAY-UP-201604 – 4 –
- automatic fire alarm systems, where provided, are to be in working order and in operation
- fire-fighting installations are to be tested regularly and readily available
- the fire main is to be readily available and periodically tested under pressure
- ventilation trunks, air inlets and watertight doors are to be kept closed.
1.2.8 Protection against explosion
Cargo spaces and piping systems are to be cleaned and ventilated to prevent gas from forming any pockets. An inert gas system in operation is recommended for the cargo spaces of oil and chemical tankers.
All flammable materials, sludge, etc. are to be removed from the ship’s bilge, tank tops, double bottom tanks, engine room, pump rooms and similar spaces. Hot work is not be carried out during lay-up, unless special precautionary measures are taken.
1.2.9 Safety equipment
All the equipment usually recommended for the safety of the watch personnel is to be provided, kept in working order and tested regularly. The usual life-saving equipment such as liferafts, life-buoys, breathing apparatus, oxygen masks and distress signals is to be provided and made accessible. The requirements of the flag Administration and of the local port authorities of the lay-up site are usually to be applied.
1.2.10 Anti-pollution measures
Depending on the lay-up mode, bilge water and water accumulated on deck should be pumped into slop tanks or similar as far as applicable. On tankers the cargo tanks should be cleaned and dirty residues disposed of at a reception facility.
1.2.11 ISM, ISPS and MLC
If the ship with Certificate of ISM has been laid-up within 6 months, an ISM occasional audit will be required prior to re-commissioning. Where the lay-up period is more than 6 months, an ISM occasional audit regarded as initial audit will be carried out prior to re-commissioning. For ships with Certificate of ISPS and MLC, the effectiveness of the Certificate shall be maintained during the lay-up period.
CHAPTER 2 REQUIREMENTS FOR PRESERVATION