Which of the following is NOT a type of basic umbilical construction?

The identification of the type of umbilical construction is important in understanding how portable surface-supplied diving systems are designed to deliver gas, communication lines, and other necessary utilities to divers. Each type of umbilical construction is characterized by its structure and layout, which influences flexibility, strength, and ease of handling.

The spiral-wound construction involves wires or hoses being wound in a helical manner, allowing for flexibility and resistance to kinking. The paralleled (taped) construction organizes the hoses and wires side by side and is typically secured with a protective tape, optimizing ease of deployment and retrieval.

Coiled umbilicals, however, are generally designed for specific applications in which the presence of a coiling structure enhances flexibility and reduces drag, allowing for a compact storage solution while maintaining access to the various lines and hoses.

The choice of umbilical type depends on the specific needs of the diving operation, as each configuration has its advantages. Recognizing that "coiled" is a recognized type of umbilical construction confirms its relevance within diving system design. Thus, stating that coiled umbilical construction is not a basic type is not accurate, as it is indeed one of the recognized configurations. The selection of “