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  The drilling and workover mast (derrick) with different loadings is designed and fabricated according to API Spec 4F and SY/T5025-1999.
 The mast (derrick) includes A type, tower type, K type, special K type, mast type and the special type used in offshore drilling.
 The main parameters for the different kinds of mast (derrick) are given in tables 1 to 6.
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