Offshore and subsea injection skids take the same core dosing components, metering pumps, tanks, piping, and controls, and reengineer them around the constraints that platform and subsea installations actually impose, where every kilogram of skid weight and every square meter of deck space carries a real cost. Materials and coatings are selected for continuous saltwater exposure, structural framing is rated for the vibration and motion loads a platform or vessel experiences, and electrical components are specified to the hazardous area classification the installation requires. For subsea applications specifically, the skid may need to operate at depth and pressure for extended periods between interventions, which shifts the design priority toward reliability and minimal maintenance access over serviceability.