The counterweight is designed to balance pipe No. 2, the lowering device, and all additional equipment installed on the lowering device relative to hinge PST No. 3. The counterweight balances the riser regardless of the tilt angle of pipe No. 2. The counterweight consists of steel discs, the number of which depends on the mass of the equipment installed on the riser beyond hinge PST No. 3. The position of the discs on the axis is adjusted using locking bushings and can be changed at any time. The operator can move the riser with one hand by applying minimal effort not exceeding 4 kg.
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