How is pulling tension calculated for an upward vs. a downward vertical pull?

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How is pulling tension calculated for an upward vs. a downward vertical pull?

2025-08-16

The tension calculation for a vertical pull is significantly different and highlights the need for precise equipment.

For an upward pull, the total tension ( $T_{t o t a l}$ ) is the sum of the cable's weight and the friction forces.

$T_{t o t a l} = T_{in} + (W \cdot L) + F_{fr i c t i o n}$

Where:

$T_{in}$ = Tension entering the section.
$W \cdot L$ = Total weight of the cable (weight per unit length multiplied by length). This is the dominant factor.
$F_{fr i c t i o n}$ = Friction force.

For a downward pull, the force of gravity works with the pull, not against it. The main challenge is controlling the speed and ensuring the cable does not free-fall. A OHTLstringingequipment.com/Hydraulic-Conductor-Tensioners.html target='_blank'>Tensioner or a pulling brake is used to provide back-tension ( $T_{in}$ ) and manage the descent.

$T_{o u t} = T_{in} - (W \cdot L) + F_{fr i c t i o n}$

Our equipment, with its precise tension monitoring and control systems, is engineered to manage these forces safely and accurately, preventing over-tensioning during upward pulls and uncontrolled descents during downward pulls.

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