Shanghai Deru Neutrally Buoyant ROV Tether (2 Power Lines + 1 Twisted Pair) – Customizable
Specification
| Basic Structure | Conductor+Insulation+Jacket+Hose |
| Conductor | Plain Copper/ Tinned Copper |
| Insulation | PE |
| Braid | Kevlar/ Plain Copper/ Tinned Copper |
| Jacket | PUR/TPE/PCP |
INTRODUCTION
The 2-power + 1-twisted-pair neutrally buoyant ROV tether cable provides the essential power supply and signal channel for compact observation-class ROVs in a near-zero-drag foamed PUR jacket. Two power conductors supply thruster and electronics power while the twisted pair carries RS-485 control, analog signals, or low-bandwidth data. 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 |
|---|---|
| Power Cores | 2 x stranded tinned copper (CSA per spec) |
| Signal | 1 x twisted pair (shielded, 0.2--0.5 mm²) |
| Jacket | Foamed micro-cellular PUR (neutrally buoyant) |
| Buoyancy | Near-neutral (0 ± 3 g/m in seawater) |
| Conductor Material | Tinned copper |
| Colour | Black or yellow |
| Custom | Conductor CSA, buoyancy, length, Kevlar |
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Coastal survey ROV tetherFrequently Asked Questions
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.
Yes. Buoyancy (positive, neutral, or slightly negative) is tuned by adjusting the foam cell density in the jacket compound and the jacket wall thickness. Specify the required net buoyancy per metre (in g/m) and the water salinity (fresh / brackish / seawater) when ordering. We can also add a Kevlar or Dyneema strength member to increase tensile strength without significantly changing buoyancy.
About Us
ADVANTAGES
FAQ
Q: Is Derul Cable the original manufacturer?
A: Derul Cable is a special cable manufacturer. Our factory is based in Shanghai.
Q: Is the price negotiable?
A: Yes, the price is negotiable. Our price is also flexible due to several factors including purchase quantity.
Q: What is the regular MOQ for your cable?
A: Any quantity is okay to purchase for product at stock. For product with no stock, its MOQ is usually 100-200 meters per type.
Q: How can I get sample?
A: Usually you only need to pay the express freight, and after your confirmation of the product dimension and structure, we can arrange the sample and send it directly to you.
Q: Is OEM or ODM service available?
A: OEM and ODM services are both available. You can provide us with your requirement for the product and we will evaluate it to push forward.
Q: What is the regular production time?
A: For regular quantity, it usually costs about 15-25 days to produce.
Quick Links
WhatsApp: +86 13641831061
E-mail: sales@derulkable.com
Add.:No.236 Fenggao Road Fengxian District Shanghai China
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