Two hook - two point lifts are characterized by a delicate balance between two hooks, and factors like tilt in cargo and COG envelope need to be accounted for.
This app is a comprehensive calculator for two-hook two-sling lifts. It can be used to design a new lift configuration using two slings and two cranes, or it can be used to verify an existing one. It follows the latest DNV-ST-N-001 guidelines.
It calculates the design load, the Dynamic Amplification Factor (DAF), and point loads
It checks the crane lifting capacity, tilt angle, and calculates the lift point load
The resulting forces and angles can be used to design/check the pad-eye for lifting
It also provides an elaborate sling design sheet based on DNV-ST-N-001
Sling Design can be done for Vertical Hitch, Choker Hitch or Basket Hitch