American Petroleum Institute

Technical Report on Material Toughness - Second Edition; Formerly Bulletin 6AM
 N TR 6AM

Annotation

INITIAL TASK GROUP CHARGE

The July 30, 1986, API Subcommittee Meeting Minutes contained the Material Toughness Task Group Charge. It comprised Attachment 6. The charge(s) were:

Evaluate the material toughness requirements for API Specification 6A materials, for acceptance worldwide.

Perform a survey of the industry and review literature for material toughness values based on technical data and design requirements.

Devise a method or action to resolve difference between the European and U.S. opinions on material toughness.

Establish work groups to prepare appropriate revisions to API Specification 6A for ballot by June 1987.

AMENDED TASK GROUP CHARGE

The Task Group came to several conclusions based on the charges:

Charge 1 : The Task Group could not evaluate worldwide parameters necessary for acceptance of API Specification 6A materials toughness requirements. The justification for other groups' requirements was not readily obvious.

Charge 2: The members of the Task Group comprised a cross section of industry users and manufacturers which have worldwide exposure. The Task Group could not document any materials related failures on equipment whose materials had met the API Specification 6A requirement of 15 ft-lb. Ali documentable failures did not meet the existing requirements. A literature survey revealed no technical data or design requirements which are relatable to API Specification 6A equipment design or usage.