land property rig 土地产权
Only it is an useful equipment of the desert rig, at the same time, it is a special suit of land rig, worth popularize.
它不仅是沙漠钻机的必备设备之一，同时，对其他地域的陆地钻机也非常适用，值得推广使用。
This standard specifies the technical requirements special regulations on the inspection lifting and laying down of self-erection mast of land rig.
本标准规定了陆地钻机自升式井架起放作业的检查、起升和下放技术要求及特殊规定。
Masts are usually rectangular or trapezoidal in shape and offer a very good stiffness, important to land rigs whose mast is laid down when the rig is moved.
桅架的形状一般呈矩形或者梯形。具有很好的刚度，对于陆地钻机而言非常重要，当钻机移去时，桅架需要放倒。
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