Gary Seider, P.E., sets out the two usual ways to specify helical piles, by minimum ultimate capacity or by required installation torque, and covers safety factors, ASD versus LRFD, load testing and acceptance criteria. It is aimed at designers who want specs that hold up and do not inflate cost.

Gary Seider, P.E., sets out the two usual ways to specify helical piles, by minimum ultimate capacity or by required installation torque, and covers safety factors, ASD versus LRFD, load testing and acceptance criteria. It is aimed at designers who want specs that hold up and do not inflate cost.
Useful background for engineers and installers sizing and specifying helical piles.
Source: CHANCE Foundation Solutions Blog (Hubbell). Summary written by the Helical Pile USA editorial team.