The type axis of SURF (Subsea Umbilicals, Risers and Flowlines) segmentation categorises the physical components that constitute subsea production systems. Umbilicals comprise bundled cables that deliver power, control signals, and chemicals; sub‑types include Power‑Control Umbilicals, Fiber‑Optic‑Enhanced Umbilicals, and Chemical‑Injection Umbilicals, each defined by conductor count, optical fiber density, and material coating. Risers transport fluids across the water column; their sub‑types—Steel Catenary Risers, Flexible Composite Risers, and Hybrid Metal‑Composite Risers—are differentiated by axial stiffness, fatigue life, and ability to accommodate temperature gradients. Flowlines convey hydrocarbons or CO₂ along the seabed; they are classified into Production Flowlines, Tie‑back Flowlines, and Riser‑to‑Flowline (RTF) assemblies, with distinctions in diameter, wall thickness, and corrosion‑inhibition strategy. The market share of each type reflects the engineering envelope of the target application: umbilicals dominate oil‑field tie‑backs, risers are pivotal in deepwater and offshore wind, while flowlines underpin long‑distance transport in CCS projects. Understanding these sub‑type nuances enables more precise cost‑allocation and risk‑assessment across the SURF market taxonomy.