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等高双A形桅杆始吊方法，一般为两桅杆对称站立于设备基础中。心两侧，这样在吊装过程中，两桅杆及附属机索具受力是均衡的。采用等高双A形桅杆不等距站立于设备基础中心线两侧（偏心）抬吊设备的方法，可以克服石油化工装置现场布置紧凑、塔类设备高而密集给施工带来的困难，其特点是：不需用大型起重机械，可缩短工期，降低施工成本。
Height double A-mast hoisting method, the two masts generally stand symmetrically on the basis of the equipment. Both sides of the heart, so in the lifting process, the two masts and auxiliary rigging force is balanced. The method of lifting the equipment on both sides (eccentric) of the center line of the equipment by adopting the double A-shaped mast without equidistance can overcome the difficulty of the compact arrangement of the petrochemical plant on site and the high and intensive tower equipment, Features are: do not need to use a large crane, can shorten the construction period, reduce construction costs.