JT/T 1281-2019Technical requirements for the selection of offshore diving support vessel (English PDF)

Foreword

This standard is in accordance with GB/T Draft the rules given in 1-2009.

This standard is proposed by and under the jurisdiction of the Technical Committee for Transport Rescue and Underwater Engineering Standardization.

This standard was drafted. Shenzhen Shanye Industrial Co., Ltd., Shenzhen Warwick Offshore Shipping Co., Ltd., Ministry of Transport Wuhu Diving Equipment Factory of Shanghai Salvage Bureau and Shanghai Salvage Bureau.

1 Scope

This standard specifies the general requirements for offshore diving support vessels, as well as decks and their facilities, positioning, cabins and their facilities, communications, and power supplies.

Should meet the requirements of the crane.

This standard applies to the selection of offshore diving support vessels.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document.

GB/T 11412. 1 Technical requirements for safe sailing of sea vessels Part 1. General requirements GB 26123 Safety Requirements for Air Diving Technical Regulations for Statutory Survey of Ships and Offshore Installations of the Maritime Safety Administration of the People's Republic of China Technical Regulations for Statutory Survey of Ships and Offshore Installations of the Maritime Safety Administration of the People's Republic of China China Classification Society Safety Rules for Special Purpose Ships Guidelines for the Preparation of Cargo Securing Manual of China Classification Society International Maritime Organization (IMO) International Convention on the Safety of Life at Sea (SOLAS Convention) Life at Sea)

3 Terms and definitions

The following terms and definitions apply to this document.

Offshore diving support vessel of shore divinction support vessel Ship or mobile facility for offshore diving engineering operations.

Special purpose ship purse ship ship Mechanical self-propelled ships with not less than 500 gross tonnage and carrying more than 12 special workers due to the needs of the ship.

Special staff work on spontaneous purchase the personnel specially required for the special operation of a ship are those who provide services for the normal navigation, operation and maintenance of the ship or for the personnel on board Additional personnel carried by other personnel.

Grid grid

A cross beam system used to strengthen the fixed foundation of deck equipment to distribute loads, also known as a grille or plate rack.

3. Five

Dynamic positioning dynamic positioning (DP) According to the ship's positioning or movement instruction, the movement information and environmental information of the ship are measured, and the computer is used to control the real-time calculation.

JT/T 1281-2019

A ship whose main and auxiliary thrust devices generate a certain amount of thrust and torque to achieve predetermined ship attitude control, positioning control or motion control Targeting.

4 General requirements

4.1 Offshore diving support vessel scale

4.1.1 Pu Fu wind power level 5 (wind speed of 8.0m/s ~ 10.7m/s) and below operating conditions, the length of the ship should be not less than 50m, the ship's draught should not be Less than 2. 5m.

4. 1. 2. The operating environment of Pu Fu wind level 6 (wind speed 10.8m/s ~ 13.8m/s) and above, the length of the ship's length should not be less than 80m, and the draft of the ship should be not less than 3. 5m.

4.1.3 The freeboard of the ship is not to be less than 1. 5m.

4.2 stability

4.2.1 The complete stability of offshore diving support ships (hereinafter referred to as "support ships") shall comply with the relevant provisions of the "Special Purpose Ship Safety Rules" Regulations.

4.2.2 The subdivision and damage stability of supporting ships shall be in accordance with the shipping area of the ship and comply with the "Statutory Survey Rules for Ships and Offshore Facilities.

Technical Regulations for Statutory Survey of Sailing Ships or Technical Regulations for Statutory Survey of Ships and Marine Facilities and the relevant provisions of the "Special Purpose Ship Safety Code".

4.2.3 After the diving equipment and auxiliary facilities are arranged and secured on board, the stability of the supporting ship shall still comply with the relevant requirements of the "Special Purpose Ship Safety Code".

Regulations.

4.2.4 When casting and recovering the diving bell or diving decompression stand, the supporting ship's dimensions and stability shall ensure that Work safely.

4.3 Safety facilities

4.3.1 Supporting ships shall be provided with life jackets, lifeboats and other safety facilities for special personnel, and shall comply with the provisions of the SOLAS Convention.

4.3.2 Smoke-fire alarm devices and fire-extinguishing systems shall be provided in the vicinity of the ship supporting the diving equipment and auxiliary facilities.

4.4 Supporting equipment for ship diving the support vessel should be equipped with compressed air, drinking water, and cooling seawater equipment for diving operations.

4.5 Inspection and evidence collection

4.5.1 Coastal navigation area support vessels shall be subject to the statutory inspection of domestic navigation ships in accordance with the "Statutory Survey Rules for Ships and Maritime Facilities" Survey Technical Regulations and Safety Regulations for Special Purpose Ships.

4.5.2 Supporting ships in the unlimited navigation area are in compliance with the "Statutory Survey Rules for Ships and Maritime Facilities" After the scheduled inspection, it shall also meet the requirements of the SOLAS Convention.

4.5.3 Support ship according to 4. 5. 1 and 4. 5. 2 After the relevant requirements have been inspected, they shall be issued by the competent authority or a duly authorized organization.

certificate.

4.5.4 Supporting ships are to be in accordance with GB/T 11412. 1 Obtain a valid certificate for navigation.

5 Deck and its facilities

5.1 The deck area of the support ship is to comply with the requirements for safe installation and arrangement of diving equipment and auxiliary facilities.

5.2 Deck arrangements for supporting ships are to ensure that.

JT/T 1281-2019

a) personnel access and exits in normal and emergency situations;

b) The locations of the diving control station and the diver's water inlet and outlet systems meet the requirements of GB 2613 diving;

c) During surface air diving operations, the distance and passage between the diver's entry and exit points and the decompression chamber on the deck meet the diving requirements;

d) Adjacent to the entry and exit of divers should provide an open area that meets the requirements of the operation;

e) there is sufficient area for personnel basket operations;

f) The lifting position of the diver's inlet and outlet system is not affected by the ship's propellers,, suction inlets and discharge outlets.

5.3 If the ship is equipped with normal use and standby diver's water inlet and outlet systems, it should meet the relevant requirements of GB 26123 water inlet and outlet methods.

Claim.

5.4 The fixed installation shall meet the following requirements.

a) The strength of the ship's deck should be evaluated before loading the diving equipment and auxiliary facilities;

b) The information required for the deck strength assessment shall be made into a data sheet or a sketch of the deck layout, stating the dimensions of the diving equipment, auxiliary facilities, Center of gravity and weight of individual equipment;

c) The unit area load of the deck should be less than the load capacity of the ship's deck;

d) When lashing and securing, the strength and securing of the deck structure shall meet the relevant requirements of the "Guide to the Preparation of the Cargo Securing Manual";

e) Local inspections should be carried out on heavy load areas such as winches and areas of release/recovery systems, and grids can be used to disperse the required Load.

5.5 Exposure to the ship's facilities should be avoided to affect diving operations.

6 Positioning requirements

6.1 positioning method the support ship shall use the following positioning methods.

a) anchoring;

b) mooring;

c) combination of anchoring and mooring;

d) Dynamic positioning.

6.2 Anchoring and mooring

6.2.1 The inspection certificates of all anchoring and mooring equipment shall be within the validity period.

6.2.2 A support vessel positioned by anchoring shall be anchored at least four points, and the number of anchoring points shall be determined according to the actual situation.

6.2.3 When anchoring at more than four points is selected, the safety of the diving site and adjacent offshore facilities shall be ensured. Type, strength, the length should meet the water depth and positioning requirements for diving operations.

6.2.4 Before anchoring, the integrity of the anchor chain and the suitability of the anchor chain should be checked.

6.2.5 Before mooring, check the maximum breaking strength and integrity of the rope.

6.3 Dynamic positioning

6.3.1 The relevant DP documents of the ship shall be kept on board and the DP operator shall hold a valid certificate.

6.3.2 Diver should choose DP support boat with positioning level above 2 when diving, optional for unmanned remote control underwater vehicle (ROV) when diving.

DP 1 Positioning class DP support ship.

6.3.3 When using DP to support ship operations, at least three position reference systems should be used online, such as differential global positioning system, tension reference System, underwater acoustic positioning reference system, microwave positioning system, optical (laser) position measurement system, etc.

6.3.4 The installation position of the positioning sensor should not affect the deployment of the diver's water inlet and outlet systems.

JT/T 1281-2019

7 Cabin and its facilities

7.1 Basic requirements

7.1.1 Should meet the 24h diving operation requirements.

7.1.2 The noise and vibration values of working and living spaces are to comply with the relevant requirements of ship inspection.

7.2 accommodation

7.2.1 Avoid sharing one cabin with different shift personnel.

7.2.2 The accommodation area shall meet the following requirements.

a) The gross tonnage of the ship is less than 3000t, and the living area per person should be greater than 2. 35m2;

b) The gross tonnage of the ship is greater than or equal to 3,000t, and the single room per person living area should be greater than 3. 75m2, above double room should be larger than 3. 00m2;

c) The living area of each special person in senior positions should be larger than 7. 5m2.

7.2.3 The cabins for special personnel in senior positions shall be single or double rooms equipped with desks.

7.2.4 Mobile accommodations shall be kept away from noise, vibration and other harmful health environments, and away from deck areas where machinery is continuously operating.

7.3 restaurants

7.3.1 Restaurant facilities and service personnel shall meet the dietary requirements for each diving shift and when boarding and changing ships.

7.3.2 The area of the restaurant shall meet the requirements for all divers to dine at the same time in one shift.

7.4 health and medical facilities

7.4.1 There should be adequate and clean toilets and shower facilities.

7.4.2 Self-service laundry equipment or washing services should be provided by personnel.

7.4.3 There shall be a dedicated medical compartment and at least one bed.

7.4.4 Medical cabins shall be equipped with first aid equipment and medicines required for diving operations.

8 Communication

8.1 The supporting ship shall establish the following communications.

a) Establish specialized communication between the diving control room, the DP console, the ROV control room, and the crane control room;

b) There should be at least two communication systems between the bridge or the DP console and the dive control room or ROV control room, which are continuously available, and One of them should be independent wired communication and equipped with backup power.

8.2 The support ship shall establish the following video systems.

a) The DP console, ROV control room, and crane control room should be able to display real-time video of the diving operation;

b) The dive control room shall be capable of displaying real-time video of ROV operations.

8.3 The diving control room shall be capable of displaying the real-time position of the diver, the diving bell and the support boat during underwater operations.

8.4 An alarm system shall be installed between the DP console, the diving control room and the ROV control room, and a failure of the positioning of the ship or a reduction in the level of the ship shall occur when low, the alarm system should be able to be activated.

9 Power supply

9.1 Power supply systems for main and emergency power sources shall be provided. The emergency power supply should be set independently, and its power supply load should meet the ship's own use (Including redundancy).

JT/T 1281-2019

9.2 The routing of power supply cables for diving operations should be reasonable to avoid cable damage.

9.3 Install a circuit breaker that meets the load requirements.

9.4 There shall be an isolation transformer that does not exceed the short-circuit quota of the total distribution.

9.5 The power cord should be routed separately and separated from the gas pipeline with an oxygen concentration exceeding 25%.

9.6 For saturated diving operations, an independent power source other than the ship's main power system used for the high-pressure escape system lifting device should be provided.

10 Crane

10.1 When installing underwater structures, a crane that meets the requirements of the operation shall be provided.

10.2 When diving with a closed bell, the safety load and placement of the crane should meet the requirements of the emergency bell.

10.3 The crane should have a valid certificate.

10.4 The crane driver shall hold a valid certificate and shall have the ability to communicate directly with the diving supervisor.

10.5 The crane commander shall hold a valid certificate and shall have the ability to communicate directly with the crane pilot and the diving supervisor.

JT/T 1281-2019