Guy line

The derrick or mast must also be designed to withstand wind loads. Wind loads are imposed by the wind acting on the outer and inner surfaces of the open structure. When designing for wind loads, the designer must consider that the drill pipe or other tubulars may be out of the hole and stacked in the structure. This means that there will be loads imposed on the structure by the pipe weight (i.e., setback load) in addition to the additional loads imposed by the wind. The horizontal forces due to wind are counteracted by the lattice structure that is firmly secured to the structure s foundation. Additional support to the structure can be accomplished by the guy lines attached to the structure and to a dead man anchor some distance away from it. The dead man anchor is buried in the ground to firmly support the tension loads in the guy line. The guy lines are pretensioned when attached to the dead man anchor. 

Guy line A wire rope with one end attached to the derrick or mast assembly and the other end attached to a suitable anchor. 

Height of derrick and mast without guy lines The minimum clear vertical distance from the top of the working floor to the bottom of the crown block support beams. 

Guy line loading (assume ground anchor pattern consistent with manufacturer s guying diagram shown on the nameplate). 

Wire Rope. Wire rope for guy lines or erection purposes shall conform to API Specification 9A Specification for Wire Rope. ... 

This recommendation is applicable for most conditions encountered in the use of this type mast. There will be exceptions where location clearance, ground conditions, or other unusual circumstances require special considerations. Figure 4-5 shows a recommended guying pattern that may be used under general conditions in the absence of an authorized API manufacturer s recommendations. Guy lines should be maintained in good condition, free from rust, corrosion, frays, and kinks. Old sand line is not recommended for guy lines. 

All chains, boomers, clamps, and tensioning devices used in the guy lines shall satisfy the mast manufacturer s recommendations. In the absence of mast manufacturer s recommendations, the following minimum breaking strengths should be maintained load guy lines—18 tons external guy lines—12 tons racking board guy lines—10 tons. 

Guy Line Anchors for Portable Masts with Guy Lines... 

Guy line anchors including expanding anchors, concrete deadmen, or any other approved techniques are acceptable. The soil condition may determine the most applicable type. Recommendations for anchor design and testing are as follows ... 

All guy line anchors should have a minimum breaking or pull-out strength at least equal to two times the maximum total calculated anchor load in the direction of the resultant load, and in the absence of manufacturer s recommendations, values in Table 4-3 are recommended. 

Custom ropes Speciality appbcations marine salvage deep sea mooring space tethers guy lines lariat ropes... 

Whether at a mountaineering base camp, on a rock ledge partway up a mountain, on a seaside camp site, at a fairground, or in other places, tents, gazebos, and marquees use cordage as stays for their poles and guy lines to hold out the canvas. 

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