1 Scope 1.1 DESIGN RATING BASIS This specification provides a basis for establishing the ratings of main load carrying components of certain hoisting equipment used in drilling and production operations as follows: 1.1.1 Maximum Load Rating This is a calculated maximum load rating using a prescribed design safety factor on the minimum yield strength of the material used in the equipment. This load rating is not intended to fix the expected service life other than by providing a reasonable margin of safety against failure. CAUTION: The terms safety factor or design safety factor are intended as design criteria and should not under any circumstances be construed as allowing loads in excess of the maximum load rating as established under this specification. 1.1.2 Bearing Load Rating This is a calculated maximum load main-bearing rating for traveling blocks, and swivels. This bearing rating is intended primarily to achieve consistency of ratings, but is also intended to provide a reasonable service life for such main bearings when used at loads within the equipment rating. 1.1.3 Design Criteria This specification provides for a method of rating main load carrying components of certain hoisting equipment used in drilling and production operations, predicated on normal field loading in which the following conditions are assumed to exist: a. The maximum load rating includes all static loads encountered in the operation of the equipment. It should be recognized that dynamic loads exist and if the combined static and dynamic loads exceed the maximum safe working load, the safety factor will be reduced accordingly. b. The fatigue limit of the material in the equipment and the effect of stress risers are recognized as important factors in design. c. The ratings determined herein are intended to apply to new equipment only. d. Modification, including welding, can be detrimental to and substantially reduce the rating of the equipment and shall not be done without the approval of the manufacturer. e. Low temperature effects are recognized as described in 5.9. 1.2 RATING ASSURANCE--MANUFACTURED UNITS This specification provides the manufacturer with a means for adequately assuring that manufactured units will meet the design load ratings established in accordance with 1.1 as follows: 1.2.1 Material Controls The use of material controls by the manufacturer provides assurance that the materials used in the equipment will be suitable for its intended use. Material controls verify compliance with the requirements of Section 4, Materials. 1.2.2 Process Controls The use of process controls by the manufacturer provides assurance that the equipment has been manufactured in a manner resulting in a consistent level of quality and reliability. 1.2.3 Non-Destructive Examination (NDE) NDE and/or test controls provide for uniformity in methods, procedures and standards of acceptance. 1.3 SUPPLEMENTARY REQUIREMENTS This specification also covers a group of supplementary requirements which may be applied to equipment manufactured under the provisions of this specification. These are meant to be used when additional testing or inspection is desired and apply only when specified individually by the purchaser in the inquiry, contract, and order. Details of these requirements shall be as agreed to by the manufacturer and purchaser. 1.4 EQUIPMENT COVERED Items of drilling and production hoisting equipment covered by the specification are: a. Crown block sheaves and bearings. b. Traveling blocks. c. Block-to-hook adapters. d. Connectors and link adapters. e. Drilling hooks. f. Tubing and sucker rod hooks. g. Elevator links. h. Casing, tubing, and drill pipe elevators. i. Sucker rod elevators. j. Rotary swivel bail adapters. k. Rotary swivels. l. Spiders, when capable of being used as elevators. m. Deadline tie-downs. n. Heave compensators o. Kelly spinners, when capable of being used as tension member p. Tension members of sub-sea handling equipment