Compensation and hoisting apparatus

A method to compensate for vessel motions without the use of a stationary reference comprising the steps of:

• a. running the hoisting cable (46) through the first splittable block (92) connected to the trolley topside (28) and the supporting base (14), over the first pulleys (22), over the second pulley (27), over compensator pulleys (42) to first winch (48) forming a hoisting device (10);
• b. running the second connection cable (70) through the second splittable cable block (57) through third fixed cable blocks (50), over the second cable pulley set (54) to secondary hoisting mechanism (72) forming a secondary compensator (49);
• c. locking the second splittable cable block (57) to the vessel (12) or the base structure (14);
• d. activating secondary hoisting mechanism (72);
• e. activating first winch (48);
• f. moving compensator (36) to a position where the distance between compensator second end (40) and compensator first end (38) is minimal;
• g. moving the trolley (24) to an upper position by paying in hoisting wire (46);
• h. moving the second splittable block to an upper position by paying in connection cable (60);
• i. setting the correct number of first loose pulleys (94);
• j. setting the same number of second loose pulleys (96);
• k. lowering the trolley (24) by paying out the hoisting cable (46);
• l. lowering the second splittable block (96) by paying out connection cable (60);
• m. attaching the load (34) to the gripping mechanism (32);
• n. attaching the second splittable block (96) to the vessel (12);
• o. activating the motion sensor and detect the motions of the vessel;
• p. activating the secondary compensator (49) compensator (36) and compensate for vessel motions using a controller and the motion sensor;
• q. placing the load (34) by paying out hoisting cable (46);
• r. stopping first winch (48);
• and
• s. stopping secondary hoisting mechanism (72).

A method for lowering a load and placing the loads on a stationary reference comprising:

• a. running the hoisting cable (46) through the first splittable block (92) connected to the trolley topside (28) and the supporting base (14), over the first pulleys (22), over the second pulley (27), over compensator pulleys (42) to first winch (48) forming a hoisting device (10);
• b. running the second connection cable (70) through the second splittable cable block (57) through third fixed cable blocks (50), over the second cable pulley set (54) to secondary hoisting mechanism (72) forming a secondary compensator (49);
• c. locking the second spliltable cable block (57) to the vessel (12) or the base structure (14);
• d. activating secondary hoisting mechanism (72);
• e. activating first winch (48);
• f. moving compensator (36) to a position where the distance between compensator second end (40) and compensator first end (38) is minimal;
• g. moving the trolley (24) to an upper position by paying in hoisting wire (46);
• h. moving the second splittable block to an upper position by paying in connection cable (60);
• i. setting the correct number of first loose pulleys (94);
• j. setting the same number of second loose pulleys (96);
• k. lowering the trolley (24) by paying out the hoisting cable (46);
• l. lowering the second splittable block (96) by paying out connection cable (60);
• m. attaching the load (34) to the gripping mechanism (32);
• n. attaching the second splittable block (96) to the vessel (12);
• o. activating the motion sensor and detect the motions of the vessel;
• p. activating the secondary compensator (49) compensator (36) and compensate for vessel motions using a controller and the motion sensor;
• q. placing the load (34) by paying out hoisting cable (46);
• r. stopping first winch (48);
• and
• s. stopping secondary hoisting mechanism (72).