API 4F 2020 pdf download.Specifcation for Drilling and Well Servicing Structures.
3.10 design reference wind velocity V ref The wind velocity of a 3-second gust at a 10 m (33 ft) reference elevation, in knots, for the appropriate return period at the intended drilling location. 3.11 design validation The process of proving a design to demonstrate conformity of the product to design requirements. 3.12 design verifcation The process of examining the result of design and development output to determine conformity with specifed requirements. 3.13 dynamic loading Loading imposed upon a structure as a result of motion. 3.14 erection load Load produced in the mast and its supporting structure during its raising and lowering, or in the substructure during its raising and lowering. 3.15 guide tracks and dollies Equipment used to hold the traveling equipment in correct position relative to the derrick during various operations. NOTE A retractable dolly is used move the traveling equipment horizontally between the drilling position and the retracted position. 3.16 guy line Wire rope with one end attached to the mast assembly and the other end attached to a suitable anchor to provide structural and/or lateral support for a mast under design loading conditions. 3.17 guying pattern Plan view showing the manufacturer’s recommended locations for guy lines and their distance out to the anchors with respect to the centerline of the well. 3.18 heave Distance of movement from above or below horizontal. 3.19 impact loading Loading resulting from near-instantaneous changes of forces. 3.20 mast Structural latticed tower of rectangular cross section with an open face. 3.21 mast setup distance Distance from the centerline of the well to a designated point on the mast structure defned by a manufacturer to assist in the setup of the rig.
3.22 maximum rated design wind velocity V des The wind velocity after adjustment for SSL by the onshore or ofshore factor of a 3-second gust at a 10 m (33 ft) reference elevation, in knots, used to calculate the force that the drilling structure is designed to resist. 3.23 maximum rated static hook load Load composed of the weight of the traveling equipment and a static load applied to the traveling equipment. NOTE It is the largest load that can be applied to the structure within the guidelines imposed by this standard with a specifed number of lines strung to the traveling block and in the absence of pipe setback, sucker rod, or wind loading. A designated location of the deadline anchor and drawworks is assumed. 3.24 nominal wire rope assembly strength Nominal strength of the wire rope, multiplied by the efciency of the end attachment in accordance with API 9B. 3.25 period (of roll, pitch or heave) τ Time required for a complete cycle. 3.26 pipe lean Angle between the vertical and a typical stand of pipe in the setback. 3.27 product specifcation level PSL Level of material and process controls placed upon the primary load-carrying components of the covered equipment. 3.28 racking platform Platform located at a distance above the working foor for laterally supporting the upper end of racked pipe. 3.29 rated setback Maximum weight of tubular goods that can be supported by the substructure in the setback area. 3.30 rated static rotary load Maximum weight that can be supported by the rotary-table support beams. 3.31 rod board Platform for supporting rods that is located at a distance above the working foor. 3.32 roll pitch Angle of movement to one side from vertical. 3.33 service rig mast A mast designed with ratings for operations with or without setback or rods. NOTE See Table 3.