What is the interval marking for umbilicals beyond 100 feet?

The proper interval marking for umbilicals beyond 100 feet is established at 50-foot intervals. This means that for every 50 feet of depth, there should be a clear marking on the umbilical that allows divers to easily gauge their depth as they descend. This system is crucial for safety and operational efficiency, as it helps divers and surface support teams to maintain awareness of the diver's depth, facilitating better communication and safety checks.

Other interval markings, such as 10-foot, 30-foot, or 100-foot intervals, are not standard for marking umbilicals beyond 100 feet because they either provide too much detail for deeper depths (in the case of 10-foot intervals) or are too sparse for effective monitoring (like 100-foot intervals). The use of 50-foot intervals strikes a balance, offering sufficient detail for awareness without overwhelming the diver or support teams with excessive markers.