OSI Plastics Telecom

Safe Pulling Strength for HDPE Pipe

Estimated Safe Pull Force, lbs

Size Nominal OD SDR 9 SDR 11 SDR 13.5
1" 1.315 800 670 550
1 1/4" 1.660 940 787 653
1 1/2" 1.900 1,232 1,030 855
2" 2.375 1,924 1,610 1,336
2 1/2" 2.875 3,800 3,200 2,600
3" 3.500 4,179 3,497 2,902
4" 4.500 6,908 5,780 4,797
5" 5.563 11,248 9,412 7,811
6" 6.625 14,973 12,529 10,398

12 hour Pull IPS Size

The above table represents safe pull strength under perfect conditions. Consideration should be given to variables such as type of soil, ground conditions, length of run and operator experience.

Mechanical Stress

Regardless of the installation method, mechanical stress is of great concern during conduit placement. Exceeding the maximum allowable pulling tension or the minimum allowable bending radii can damage conduit. Consult the conduit supplier for allowable pulling tensions.

Pulling Tension

During conduit pulling placement, attention should be given to the number of sweeps, bends or offsets and their distribution over the pull. Tail loading is the tension in the cable caused by the mass of the conduit on the reel and reel brakes. Tail loading is controlled by two methods. Using minimal braking during the pay-off of the conduit from the reel at times can minimize tension; no braking is preferred. Rotating the reel in the direction of pay-off can also minimize tail loading. Breakaway swivels should be placed on the conduit to ensure that the maximum allowable tension for that specific conduit type is not exceeded. The swivel is placed between the winch line and pulling grip. A breakaway swivel is required for each conduit.