scope:

Foreword:

As a matter of information, and for the guidance of manufactures and users who may require these data, this bulletin gives minimum performance properties on proposed high-strength casing joints, as developed by the API Committee on Standardization of Oil Country Tubular Goods, in the course of a study of internal-upset casing sizes and related data. At this meeting the committee approved the following proposals:

1.That material previously discussed as "internal upset casing" hereinafter be designated as "API high-strength casing joint."

2. That, for the present, consideration be limited to four sizes, these being 516-in., 7-in., 85/8 -in., and 9H-in.

That consideration be limited to Grades J-55 and N-80 casing, except that the 24-lb. Grade J-55, S%-in. size should not be considered.

That further study be confined to two types of joints, these being for non-upset casing and for internal-upset casing which will permit the passage of the drift specified for the corresponding size and weight of non-upset casing.

That further consideration be confined to treated Joints, it being stated that one method of treatment now being used to a considerable extent, increases the tensile strength of the threaded joint 85 per cent, while another treatment in use at present produces a tensile strength of the non-upset threaded joint equal to that of the body of the pipe.

That these joints be provided with either long or short threads, and if couplings with strengths greater than provided by present API couplings are required, the need can be met by treating the coupling.