Published on:2026-05-24 Click:25
PUR double-sheath neutrally buoyant ROV tether cable with integrated air duct. Foamed PUR for ROV tether with pneumatic supply or buoyancy air channel.
The PUR double-sheath neutrally buoyant cable with air duct integrates an air supply channel alongside electrical conductors within a foamed neutrally buoyant jacket. The air duct serves dual purposes: it provides pneumatic supply for diver breathing air, buoyancy bladder inflation, or tool actuation, while the air-filled space contributes to the overall positive buoyancy of the tether. The double-sheath construction protects the air duct from external compression damage at operating depth. The foamed polyurethane (PUR) jacket uses a micro-cellular expanded jacket compound with a bulk density lower than seawater (~1.025 g/cm³), giving the cable near-zero or positive net buoyancy. This eliminates tether sag and reduces drag force on the ROV, improving vehicle manoeuvrability and reducing tether management workload during subsea operations.
| Parameter | Specification |
|---|---|
| Electrical Cores | Per spec (power + signal) |
| Air Duct | Integrated PU/PVC duct (ID per spec) |
| Inner Jacket | Solid PUR |
| Outer Jacket | Foamed micro-cellular PUR |
| Buoyancy | Near-neutral |
| Duct Pressure Rating | Up to 20 bar (200 m equiv.) |
| Custom | Duct ID, conductor config, Kevlar, length |
Request datasheet, custom length, or OEM pricing: sales@rovcable.com -- Shanghai Kabel Intelligence Technology Co., Ltd.
The jacket is manufactured from a micro-cellular expanded (foamed) polyurethane compound. During extrusion, a controlled foaming agent creates millions of tiny closed-cell air pockets within the jacket wall. These air cells reduce the bulk density of the jacket below that of seawater (~1.025 g/cm³), producing positive or neutral net buoyancy. The jacket retains all the abrasion resistance, oil resistance, and flexibility of standard PUR while achieving the buoyancy needed for ROV tether applications.
Standard inner diameters: 4 mm, 6 mm, 8 mm, 10 mm, 12 mm. Larger diameters are available for high air flow requirements. Specify the required air flow rate (L/min at depth pressure) and maximum operating depth -- we will recommend the minimum duct ID and confirm the pressure rating.
