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1.5 Boom Head Locations The boom head locations for the certification of union purchase conditions should reflect realistic operating conditions for the particular gear and hatch configuration. 3 Design 3.1 Design Plans Required Plans are to be submitted showing the configuration of the cargo gear, vang and preventer details and locations, hatch opening, coaming height, deck at side, bulwark height, vessel’s maximum beam and the boom head location over the hatch and over the side of the vessel. 3.3 Force Diagrams and Calculations Force diagrams and calculations are to be submitted showing the forces in all components of the gear for the configuration to be certified. 3.5 Path of Load Hook for Analysis and Testing The path of the load hook between booms for analysis and testing is to be a straight line parallel to the deck. The height of the path above the deck is to be the lowest height at which the angle between the cargo runners equals 120 degrees. Where sufficient hook clearance above coamings and bulwarks can be obtained using a lesser height, such a height may be approved.
Chapter 3 Guide for Certification of Cargo Gear on Merchant Vessels Section 4 Union Purchase 3-4 76ABSGUIDE FOR CERTIFICATION OF LIFTING APPLIANCES.2007 3.7 Angle Between Cargo Runners The angle between the cargo runners is not to exceed 120 degrees. 3.9 Record of Union Purchase Arrangement A diagram showing the configuration of the gear, vang locations and boom head locations for which the gear is certified is to be submitted and placed in the Register of Lifting Appliances (See 3-12/1). 3.11 Factors of Safety Factors of safety are to be as specified in 3-2/5. 5 Proof Test to Cargo Gear for Union Purchase 5.1 Required Tests Before the cargo gear is placed in service, it is to be tested and examined in accordance with 3-3/5, with the addition of those items specified in the following paragraphs. 5.3 Gear Rigged for Testing The gear is to be rigged as shown on the diagram required by 3-4/3.9. 5.5 Testing and Inspection Details The proof load as specified in 3-3/5.1 is to be applied by hoisting movable weights. The proof load is to be lifted to the approved hook height above the deck in such a manner that all the load is taken by one runner, then transferred along a path parallel to the deck until it reaches the other boom and the entire load is taken by the runner which had been slack. After being tested as aforesaid, the gear is to be rigged so that the inboard (hatch) boom will become the outboard (shore) boom and vice versa. The test is to then be repeated. After being tested for union purchase on both sides of the vessel, all cargo gear, with the whole of the gear accessory thereto, and all chains, rings, hooks, links, shackles, swivels, pulley blocks or other loose gear are to be examined to see whether any part has been injured or permanently deformed by the test.