The invention relates to a method for testing ship towing capability onshore. The method comprises the following steps: A, enabling the towed end of a towing cable to be connected with a towing machine of a ship, enabling the other end of the towing cable to be connected with one end of a tension meter, and enabling the other end of the tension meter to be connected with a bitt on the shore; B, setting right the bow of the ship, controlling the ship to slowly depart from the shore, adjusting the power of a main engine of the ship, and pretightening the towing cable; C, adjusting the power of the main engine of the ship to obtain different power values so as to respectively perform static tension tests at the different power values; in each static tension test, keeping preset time after the tension is stable; recording the working conditions of the main engine, at the same time, reading measured values of the tension meter through a remote measurement displayer, and recording the read measured values; and D, completing the test according to the measured values of the tension meter in all the static tension tests, and a test analysis result of the working conditions of the main engine. Through the adoption of the method disclosed by the invention, a towing test can realize a towing test at a harbor basin and onshore, and the towing capability of a ship can be accurately tested, so that the test cost and the safety risks are greatly reduced.

Method for testing ship towing capability onshore

The invention discloses a dynamic positioning ship pipe laying tracking guiding method. The method includes the steps that 1, a pipe laying path is worked out according to a pipe paying starting point a (x1 and y1), a turning point b (x2 and y2), a pipe laying termination point c (x3 and y3), a pipe landing point, the longitudinal speed vdp and the angular speed omega which are set by a pipe laying ship; 2, an expected ship path is worked out according to the pipe laying path and the pipe suspended span section length; 3, a guiding point motion trail is worked out according to the pipe laying path and the set speed; 4, the deviation between the actual position of the ship at the current moment and the position of a guiding point and the deviation between the heading of the ship at the current moment and the heading of the guiding point are worked out, a PID control law is adopted, and control force and torque of the ship in pipe laying work are acquired; 5, the actual laying position of a pipe is acquired according to the actual position of the pipe laying ship. The system stability and control accuracy can be improved.

Dynamic positioning ship pipe laying tracking guiding method

Pipe laying ship upper tensioning device and pipe line retractable winch tensile force testing method, comprising 1, making preparations before testing; 2, a tensile force static test of a first tensioning device; 3, verifying the capability of the static tensile force for a retractable winch; 4, tensile force conversion of the first tensioning device and the retractable winch; 5, dissembling a tension meter and part of a first wire rope used in the static test, to achieve the initial state of a dynamic test; 6, testing the function of a dynamic and automatic retractable pipe line of the first tensioning device; 7, testing an active retractable pipe line of the retractable winch, to keep a constant dynamic function for the tensile force. The invention does not require welding and installations on a pipe laying ship or dissembling an appending reinforcement structure or supply an extra append device or resources, can conduct tensile force testing on tensioning devices and pipe line retractable winches, greatly increases testing efficiency, and brings improvements to the issues of test mode conversion process, dynamic test and tensile force conversion function.

Pipe laying ship upper tensioning device and pipe line retractable winch tensile force testing method

The invention relates to a dead load testing device and a dead load testing method for a large anchor handling lift winch. The dead load testing device comprises a main steel cable, wherein one end of the main steel cable is connected with a large anchor handling lift winch to be tested; the other end of the main steel cable is connected with one end of a force measuring device; and the other end of the force measuring device is connected with a fastening device through an auxiliary steel cable. The dead load testing device is simple in structure, convenient to mount and high in structural strength; in a dead load testing process, tools such as weights are not required, a dead load test can be greatly simplified, the test construction efficiency is improved, and the ship manufacturing cost is reduced. In the testing method, the tools such as the weights are not required, a large amount of preparation or tail-in operations due to preparation, installation, adjustment and tool disassembling are avoided, the dead load test is greatly simplified, the test construction efficiency is improved, and the ship manufacturing cost is reduced. Moreover, the dead load testing device is high in test accuracy and easy to operate, and is safe and reliable.

Dead load testing device and dead load testing method for large anchor handling lift winch

The invention discloses a method for testing the static load of a pipe laying system of a pipe-laying ship The method includes the steps of placing a subsea pipeline on a lower tack of a tensioner, installing a roller on the end of the subsea pipeline near the stern, installing a first left hanger and a first right hanger on two sides of the stern, installing a second left hanger and a second right hanger on the hull between the tensioner and the stern, allowing a first wire rope to pass through the roller, sequentially connecting a dynamometer, a second wire rope and the first left hanger to the left end of the first wire rope, sequentially connecting a third wire rope and the first right hanger to the right end of the first wire rope, installing a first crane between the joint of the dynamometer and the second wire rope and the second left hanger, installing a second crane between the joint of the first wire rope and the third wire rope and the second right hanger, adjusting the first crane and the second crane, adjusting the first wire rope and the dynamometer to a horizontal level, and starting the tensioner to read the reading of the dynamometer The method is simple, easy and highly applicable

Method for testing static load of pipe laying system of pipe-laying ship

The invention discloses a pull test system of a pipe-laying ship. The pull test system of the pipe-laying ship comprises a guide pulley, a tooling steel cable, a triangular plate, a traction winch cable, a universal tube connector, a tensioner, a traction winch and a pipe, wherein the triangular plate is connected to the traction winch through the traction winch cable, the universal tube connector is connected to the pipe penetreating the tensioner, the traction winch cable penetrates the universal tube connector, the guide pulley is fixedly connected to a fixed base, the tooling cable is wound through the guide pulley to be connected to the triangular plate and the universal tube connector respectively, and the universal tube connector comprises a hauling eye plate. The invention further discloses a pull test method of the pipe-laying ship. The pull test system of the pipe-laying ship uses a detachable deflecting pulley device to replace a traditional fixed lifting lug and is provided with a universal traction connector applicable to tubes of different diameters through refit, thereby greatly reducing the occupation space of the pull test system, improving the efficiency and solving the problem of the conflict of the guide pulley located in the middle side of the ship with other equipment.

Li Weirui

Papers

Pull test system and method of pipe-laying ship