API Spec 8A-2001 pdf free download

API Spec 8A-2001 pdf free download.Specification for Drilling and Production Hoisting Equipment.
Scope 1.1 DESIGN RATING BASIS This specification provides a basis for establishing the ratings of main load carrying components of certain hoist- ing equipment used in drilling and production operations as follows: 1.1.1 Maximum Load Rating This is a calculated maximum load rating using a pre- scribed 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 provid- ing 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 circum- stances be construed as allowing loads in excess of the maxi- mum 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 encoun- tered 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.
4 Material Requirements 4.1 CASTINGS Steel castings used in the manufacture of the main load carrying components of the equipment covered in this specifi- cation shall conform to ASTM A781: Common Requirements for Steel and Alloy Castings for General Industrial Use , and either an individual material specification listed therein or a proprietary material specification that as a minimum con- forms to ASTM A781. 4.2 FORGINGS Steel forgings used in the manufacture of the main load carrying components of the equipment covered in this spec- ification shall conform to ASTM A668: Steel Forgings, Car- bon and Alloy, for General Industrial Use and ASTM A788: Steel Forgings, General Requirements. A material specifica- tion listed in ASTM A788 or a proprietary specification con- forming to the minimum requirements of ASTM A788 may be used. 4.3 PLATES, SHAPES, AND BAR STOCK Structural material used in the manufacture of main load carrying components of the equipment covered in this specifi- cation shall conform to applicable ASTM or API specifica- tions covering steel shapes, plates, bars, or pipe, or a proprietary specification conforming to the minimum require- ments of applicable ASTM or appropriate standard. Struc- tural steel shapes having a specified minimum yield strength less than 33,000 psi, or steel pipe having a specified mini- mum yield strength less than 35,000 psi shall not be used. 4.4 OTHER MATERIALS Other materials may be used in the main load carrying components of equipment, provided the suitability of the material for a particular use has been verified by testing and the material conforms to a written specification.
5.11 PARTS TESTING Individual parts of a unit may be tested separately if the holding fixtures duplicate the load conditions applicable to the part in the assembled unit. 5.12 TEST FIXTURES Test fixtures shall support the unit (or part) in the same manner as in actual service, and with the same areas of con- tact on the load-bearing surfaces. 5.13 TEST PROCEDURE 5.13.1 The test unit shall be loaded to the maximum rated load. After this load has been released, the unit shall be checked for intended design functions. The intended design function of all equipment parts shall not be impaired by this loading. 5.13.2 Strain gauges may be applied to the test unit at all points where high stresses are anticipated, provided that the configuration of the units permits such techniques. Note: The use of finite element analysis, models, brittle lacquer, etc., is recom- mended to confirm the proper location of strain gauges. Three-element strain gauges are recommended in critical areas to permit determination of the shear stresses and to eliminate the need for exact orientation of the gauges. 5.13.3 The maximum test load to be applied to the test unit shall be determined as follows: Test load = 0.80 x R x SF D , but not less than 2 R. Where: R = the calculated load rating in tons. SF D = design safety factor used (see 5.6). 5.13.4 The unit shall be loaded to the maximum test load. Note: The test load should be applied carefully, reading strain gauge values and observing for yielding. The test unit may be loaded as many times as necessary to obtain adequate test data. 5.13.5 Upon completion of the load test, the unit shall be disassembled and the dimensions of each part checked care- fully for evidence of permanent deformation.