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API SPEC 8A Document Information:
Title
Specification for Drilling and Production Hoisting Equipment
American Petroleum Institute
Publication Date:
Dec 1, 1997
Scope:
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
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