API RP 4G pdf free download
API RP 4G pdf free download.Operation, Inspection, Maintenance, and Repair of Drilling and Well Servicing Structures.
5 Use and Maintenance
5.1 General
Maintenance of equipment consists of actions such as adjustments, cleaning, lubrication, and replacement of expendable parts. The complexity of these activities and the safety risk involved should be considered in the assignment of appropriate resources such as facilities and equipment.
In addition to the procedures developed in accordance with 4.1, the manufacturer should define any special tools, materials, measuring and inspection equipment, and personnel qualifications necessary to perform the maintenance.
The manufacturer has used care in design and selection of material for the drilling or well servicing structure. The structure should give satisfactory performance when used within the stipulated load capacities and in accordance with instructions. Every crew member involved in erecting and lowering the structure should be given instructions and training in those operations they are directly involved in.
5.2 Loading
The safe operation of drilling and well servicing structures depends on whether the foundation is adequate for the load imposed (see Section 11). Environmental and dynamic loads should be considered. The design load for foundation requirements should be the sum of the weight of the drilling or well servicing structure, the weight of the machinery and equipment on it, the maximum hook or rotary load of the structure, forces due to external guywire loading, and the maximum setback load (see Section 15).
During erecting and lowering operations utilizing the rig drawworks, the slowest practical line speed should be used.
Loads due to impact, jarring, acceleration, and deceleration may be indicated by fluctuation of the weight indicator.
The operator should keep the indicator readings within the nameplate hook load capacity rating.
Some rig designs require that the mast base structure be restrained against uplift from the application of mast hook load.
5.3 Bolted Structure 5.3.1 General Each part of a bolted structure is designed to carry its share of the load. Parts omitted or improperly placed may contribute to the failure of the structure. During erection of bolted structures, bolts should be left loose enough, in way of erection, to allow proper fit of adjacent mast/derrick members without distortion and locked in stress. This procedure permits correct alignment of the structure, which results in proper load distribution. At completion of erection, all bolts should be checked for proper torque. Periodically, all bolts should be checked for proper torque. Suitable instructions regarding the proper installation of clamps, pins and bolts used for tie downs shall be developed for existing structures by a qualified person utilizing manufacturer’s guidelines when available. Tie down components incorporating bolts which are expected to be tensioned multiple times shall be designed with specified pretension no greater than 50 % of the bolt material minimum ultimate strength times its nominal cross-sectional area. Clamp installation instructions shall include pretension values and tolerances. Bolt tensioning shall be achieved using calibrated tensioning methods. Bolts that are specified to be pretensioned to a higher value than 50 % of the bolt material minimum ultimate strength shall only be used once. The length of bolts shall be such that the end of the bolt will be flush with or outside the face of the nut when properly installed. While it may the responsibility of the manufacturer to give guidelines on erection and bolt installation, it is the responsibility of those performing the actual work that are accountable.API RP 4G pdf download.
