An article on CT Mechanical Limits by a recognized industry  expert Ken Newman. The article discusses force and pressure limits for coiled tubing and the mathematical models employed for calculating these limits. The theoretical information with the von Mises incipient yield criterion being introduced as a widely accepted model for establishing CT limits is illustrated with useful examples. This is a must-read article for all those who want to take a deeper insight into the nature of CT Collapse and learn about how it can be predicted.