API spec 4F:2001 pdf download.Specification for Drilling and Well Servicing Structures
1 Scope
This specification covers the design, manufacture, and use of steel derricks, portable masts, crown block assemblies, and substructures suitable for drilling and servicing of wells. It includes stipulations for marking, inspection, standard ratings, design loading, and design specifications of the equipment. Definitions of commonly used terms are in- cluded in Section 3.
1.1 PURPOSE
1.1.1 The purpose of this specification is to provide suit- able structures for drilling and well servicing operations and to provide a uniform method of rating the structures for the petroleum industry. It is the intent that these specifications be applied to all new designs of all standard derricks, spe- cial derricks, portable masts and substructures.
1.1.2 Products manufactured according to API Standards 4A, 4D, and 4E may not necessarily comply with all the re- quirements of this specification. It is the committee’s inten- tion that this standard be written to meet the requirements of present and future operating conditions, such as deeper drilling, offshore drilling from floating devices, and the effect of earthquakes, storms, and other adverse operating conditions.
1.1.3 The standard is not a text book, but rather a guide by which the manufacturer and user will have a common under- standing of the capacities and ratings of the various struc- tures for drilling and well servicing operations.
3 Definitions
For the purposes of this standard, the following definitions apply: . 3.1 angle of roll or pitch: The angle of movement to one side from vertical. 3.2 critical components: A component which is neces- sary to maintain stability of a structure and resides within the primary load paths of the structure when the structure is loaded under the Design Loadings of Section 6. 3.3 critical weld: A weld joining critical components. 3.4 crown block assembly: The stationary sheave or block assembly installed at top of a derrick or mast. 3.5 date of manufacture: A date chosen by the manufac- turer occurring between the initiation of manufacture and the delivery to the customer. 3.6 derrick: A semipermanent structure of square or rect- angular cross- section having members that are latticed or trussed on all four sides. This unit must be assembled in the vertical or operation position, as it includes no erection mechanism. It may or may not be guyed. 3.7 design load: That force or combination of forces which a structure is designed to withstand without exceeding the allowable stress in any member. 3.8 dynamic loading: Loading imposed upon a structure as a result of motion as opposed to static loading.
API spec 4F:2001 pdf download
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