Lanjiang large-scale full-slewing offshore crane pipe-laying ship

"Lanjiang" is the largest full-slewing lifting and pipe-laying workboat in Asia at present, with a maximum lifting capacity of 3800t. It can lay various types of submarine pipelines with diameters of 4.5 "to 48", and its working water depth is 8 ~ 150m ... Lanjiang started construction on June 5438+0, 2000. In 2002, the offshore jacket installation of Nanhai Dongfang 1- 1 gas field development project was put into operation, and a 22 "submarine long-distance natural gas pipeline was laid later in the same year.

The ship is designed according to the latest international technical standards and specifications, and all large-scale equipment are world-famous brands or patented products. This paper mainly introduces the embodiment of high technology in the function of pipe laying equipment. The completion and operation of the ship indicates that China's key construction equipment capacity and technical level in the field of submarine pipeline engineering construction have ranked among the world's advanced ranks.

I. Overall performance

Figure 15-27 shows the general layout and elevation of the ship's deck.

The overall performance of the ship is as follows.

A. main dimensions:

Total length:157.5m.

Width: 48.0m.

Depth:12.5m.

Full manuscript: 8. Medal of merit

Deck load: 10t/m2

Beds: 278

Figure 15-27 Layout and Elevation of the Main Deck of Lanjiang

B. floating crane operation:

Working water depth: 8 ~150m.

Wind speed: < 16m/s

Effective wave height: < 2m

C. enhance capacity:

Ultimate swing of main hook: 3800t×30m.

Lifting capacity of main hook stern: 3000 tons × 40m.

Full rotation of main hook: 2500 tons ×44 meters.

1 # Full rotation of auxiliary hook: 800t×60m.

Full rotation of No.2 auxiliary hook: 200 t×105 m.

Small hook: 50t

D. pipeline laying equipment:

Fully automatic welding system

Full-automatic phased array ultrasonic testing equipment

Tensioner: 2×72.5t Westech LPT- 160.

Applicable pipe diameter: 4.5 inches -48 inches

AR winch:158t Westchester ARW-350

Workstation: 10

E. Mooring equipment:

Anchor: 12 M2 A 6000 McClaide.

Anchor:12 Steve Presmk 5.

Length of anchor cable: φ 3 "2200m.

F. Propeller:

Propeller: 2×FSZ5 10-563/MN.

Power/speed: 2×3000kW/750rpm.

Propeller: 2 12rpm/Dia3000mm.

G. generator:

Main generator: 3×WXL 9L32

Power: 3×3990kW

Second, the main high technology.

(1) pipeline laying operation line

Pipeline laying is a fully enclosed structure, located on the starboard side of the ship, and all operations are carried out in the workshop-style closed structure, which reduces the impact on the environment and improves the working conditions. The working capacity can be used to lay submarine pipelines with a diameter of 4.5 "(114 mm) to 48" (1219 mm) (including coating) in the water depth range of 6 meters to 150 meters. The operation line is a single-node operation line, and at the same time, The length of each single-point pipe is (12.2 0.09) m, and the length of double-node pipe is (24.4 0.18) m.

There are ten single-node operation stations in this production line, including six welding stations (including one centering station and three double-node operation welding stations), one welding inspection station, one or two anti-corrosion coating stations and one counterweight coating station. * * * Equipped with two tensioners, each with a capacity of 72.5t；; The winch capacity is about 158t. There is a connection point of stinger at the stern, which is floating and divided into three sections, with a total length of 85m and a total weight of about 340t.

The pipe laying operation depends on the operation of 12 winch. Operate all windlasses and other equipment related to laying operation, and monitor the whole operation line in the central control room at the bow.

The starboard side of the ship is equipped with five side cranes, which are used for riser installation, auxiliary stinger connection, horizontal pipe translation and other operations.

The functions of tensioners and winches, the key equipment in pipeline laying, have reached the advanced level in the world. Among them, two tensioners * * * are LPT- 160, each of which can provide 72.5t tension, and the maximum pipe running speed is 25m/min. Including hydraulic station (5 3000HP hydraulic pumps), central control and machine-side control. The control system is West CNC system.

An abandonment/recovery winch, hydraulically driven, drum winch, 76mm steel wire rope1000m, maximum tension of winch158t, cable running speed of 25m/min, which can be controlled centrally by the machine. The control system and Zhang Liqi * * * share a set of system, which can realize automatic tension conversion. The winch can provide braking force of 125% of the maximum rated tension.

(2) Anchoring system

This ship is equipped with 12 anchor positioning mooring system, of which 6 are in the bow winch room and the other 6 are in the bow winch room. The main performance of 12 ship moving winch is as follows:

Model: amclyde 6000-m2:

Specification of wire rope: 76 ~ 2200m in diameter;

Maximum pulling force: 303 t;

Maximum speed: 280m/min;

Maximum braking force: 390 t;

Rated load of damping brake:119t/96m/min;

Driving mode: AC frequency conversion driving;

Control mode: PLC control, centralized remote control/machine-side control, and each winch is controlled separately/in groups at the same time;

Console: It can display the working status of winch in all aspects and has alarm protection function.

The positioning and anchoring system of this ship includes 12 positioning anchors, each weighing 10t. It belongs to a new type of large grab anchor, and the maximum grab force can exceed 2500t, far exceeding the general grab performance.

(3) Welding and inspection equipment

1. welding equipment

Lanjiang is equipped with the international advanced SATURNAX 05 submarine pipeline automatic welding system, which has advanced technology, reliable performance, high welding efficiency and quality. The system is provided by SERIMER DAsA company in France, and its basic performance is as follows:

Applicable pipe diameter: above 6 ";

Working temperature: -40 ~+50℃;

Maximum applicable humidity for operation: 95%;

The welding head is in double welding gun mode;

Applicable welding methods: GMAW(P) and FACW (P);

Applicable welding software: ORWEL

Welding power supply: KEMPPI3500；;

Applicable pipeline laying method: S-shaped pipeline laying or J-shaped pipeline laying.

At present, Lanjiang is equipped with SATURNAX 05 welding system, which has four welding stations and corresponding equipment for groove processing and joint assembly. Due to the adoption of double welding gun technology, the welding efficiency of each welding station is doubled and the number of welding stations is reduced by half.

2. Check the instrument

At present, "Lanjiang" is equipped with automatic phased array ultrasonic flaw detection equipment. The equipment model is PWAPA, and the manufacturer is RD-TECHIN Company of Canada. Automatic phased array ultrasonic flaw detection technology is a high-tech developed in 1990s, and it has been widely used in girth weld detection of long-distance pipelines in recent years. The phased array detection system consists of data acquisition unit, pulse emission unit, electrode driving unit, phased array probe, industrial computer, display and so on. The principle of the system inspection is based on the fracture mechanics ECA (engineering critical analysis method), the weld is divided into several regions vertically by the region division method, and then the inspection parameters are preset, and then the phased array probe is controlled by the electronic system to emit sound beams and dynamically collect them, so as to scan the welds in different regions. The test results are displayed in the form of two-door strip chart. Combining TOFD (Diffraction Time Difference Method) and B-scan function, the linear scanning, real-time display and result evaluation of welds are completed. Compared with the traditional RT method, automatic phased array ultrasound has many advantages: ①AUT detection speed is fast, reaching100 mm/s; (2) (2) AUT is pollution-free and radiation-free, and all types of work on the job site can be carried out at the same time without affecting each other; (3)③ The quantitative ability of AUT for defects is improved, and the defect size of each zone (1 ~ 3 mm) along the weld thickness direction can be measured. At the same time, by scanning along the circumferential seam, the defect size in the length direction and width direction of the weld can be measured with high accuracy; (4) The ability of AUT to detect defects is improved. By automatically adjusting the angle of sound beam, the weld can be detected in all directions, so as to find various defects, especially surface dangerous defects such as incomplete fusion; ⑤AUT collects information in real time, displays the data of flaw detection results on the screen, and can judge at any time. The files are automatically saved and numbered, and the flaw detection results can be printed at any time. ⑥ AUT flaw detection can be carried out in a short time after welding to provide welding process control information; ⑦ Compared with RT, ⑦AUT is based on ECA (Engineering Critical Analysis), with high qualified rate and low rejection rate; ⑧AUT test results can be reproduced, and RT reproduction rate is low. In addition, AUT can find all the defects that RT can find; Pet-name ruby ⑨AUT one-time investment, the lowest cost of data storage.

The automatic phased array ultrasonic testing system equipped on "Lanjiang" has been applied in Dongfang 1- 1 submarine pipeline project, with good effect, stable operation, safety and rapidity, which greatly reduces the labor intensity of flaw detector.

(four) the advanced level of other equipment functions.

A. Power load management system: automatically start or stop the generator in the generator set according to different power loads, and automatically realize the grading unloading of unimportant loads when the main engine is overloaded.

B. Dynamic automatic load regulation control system: aiming at the hull inclination caused by lifting heavy objects and rotation, the hull is kept relatively balanced by automatic load regulation to ensure the safety of the ship.

C positioning mooring system: all 12 windlasses are operated and monitored in the central control room. In the process of pipe laying, the computer can control the anchor machine to make the pipe laying ship move according to the preset route during operation. The system is also equipped with a new type of large grab anchor, which is convenient for lifting and anchoring.

Crane: torque limiting system is adopted. When the lifting capacity and boom angle approach or exceed the rated standard, the system will alarm or automatically cut off the system, and when the inclination of the ship exceeds the rated standard, the system will also automatically cut off the system. It will automatically recover when it reaches the rated state. This system also includes the crane fault automatic detection system, and also adopts a unique counterweight method, which greatly reduces the weight of the crane and is very beneficial to the structure and performance of the whole ship.

E. High-power electric propeller (used for the first time in China) is adopted, and two 3000kW propellers are set at the stern, with a design speed of 6-7 knots and good maneuverability. In case of emergency, the ship position can be adjusted in time to facilitate offshore construction and ensure the safety of operation.

F. High-power electric propellers, cranes and winches all adopt AC motors and frequency conversion control systems, which are not only reliable in control, but also energy-saving.