Material Purity: The copper used has a purity of ≥99.95%, ensuring minimal electrical resistance. Impurities (such as iron or oxygen) are strictly controlled (≤0.05%) to avoid reducing conductivity or causing corrosion in saltwater.
Cross-Sectional Area: The 50mm² area is standardized to balance current capacity and installation Flexibility. For reference, a 50mm² copper conductor has a nominal diameter of approximately 7.98mm (for a solid conductor) or a stranded structure with 19 strands of 2.05mm diameter each.
Current-Carrying Capacity: The continuous current rating varies based on environmental conditions:
In shallow water (≤100m, water temperature 20°C–25°C): 140A–150A
In medium-depth water (100m–500m, water temperature 10°C–20°C): 125A–135A
In deep-sea water (≥500m, water temperature 4°C–10°C): 120A–125A
Stranding Structure: The conductor uses a class 5 stranded design (per IEC 60228), meaning it is composed of multiple thin Copper Strands twisted together. This structure enhances flexibility (minimum bending radius: 12× cable outer diameter) and resistance to fatigue from underwater currents or installation stress. For example, a 50mm² conductor typically consists of 19 strands (diameter 2.05mm) or 37 strands (diameter 1.38mm), depending on the required flexibility for specific projects.
XLPE Insulation:
Material Type: Cross-linked polyethylene (XLPE) with a density of 0.92g/cm³–0.94g/cm³.
Thickness: 2.0mm–2.5mm (uniform across the conductor, with a tolerance of ±0.1mm).
Electrical Performance: Insulation resistance ≥1000MΩ·km at 20°C; dielectric strength ≥20kV/mm (per IEC 60092-350).
Thermal Resistance: Continuous operating temperature range: -40°C to 90°C; short-term overload temperature (up to 2 hours): 130°C.
Water Absorption: <0.1% by weight after 1000 hours of immersion in distilled water at 80°C (per IEC 60811-1-1).
Metallic Water Barrier:
Material Options: Aluminum-polyethylene laminate (ALP) with an aluminum layer thickness of 0.1mm–0.15mm, or copper tape with a thickness of 0.15mm–0.2mm.
Coverage: 100% overlap (longitudinal wrapping) to ensure no gaps for water penetration.
Adhesion: The barrier is bonded to the XLPE insulation using a heat-activated adhesive, with a peel strength of ≥5N/cm.
Outer Sheath:
Material Options: Thermoplastic polyurethane (TPU) (Shore hardness: 85A–90A) or chlorosulfonated polyethylene (CSP) (Shore hardness: 70A–75A).
Thickness: 2.5mm–3.0mm (for shallow/medium-depth cables); 3.5mm–4.0mm (for deep-sea cables, to withstand high hydrostatic pressure).
Mechanical Performance: Tensile strength ≥18MPa; elongation at break ≥300% (for TPU) or ≥200% (for CSP); abrasion resistance ≤50mm³ (per ISO 4649, Martindale test).
Chemical Resistance: Resistant to 3.5% NaCl solution (saltwater), mineral oils, and dilute acids/alkalis (pH 4–9) with no visible degradation after 1000 hours of exposure.
Hydrostatic Pressure Resistance:
Shallow-water cables (≤100m): Withstand 1MPa (equivalent to 100m water depth) for 24 hours with no water ingress.
Medium-depth cables (100m–500m): Withstand 5MPa (500m water depth) for 24 hours.
Deep-sea cables (≥500m): Withstand 50MPa (5000m water depth) for 24 hours (reinforced with stainless Steel Tape in the water barrier).
Temperature Cycling Resistance: Survives 50 cycles of -40°C (4 hours) to 90°C (4 hours) with no cracking or loss of insulation performance.
UV Resistance: For shallow-water applications (exposed to sunlight), the outer sheath includes UV stabilizers (e.g., benzophenones) to resist degradation. After 1000 hours of UV exposure (per ISO 4892-3), the sheath retains ≥80% of its original tensile strength.
Impact Resistance: Can withstand a 1kg weight dropped from 1m (per IEC 60811-504) with no damage to the insulation or conductor.
Water Depth Rating: As noted earlier, sheath thickness and barrier reinforcement are adjusted for different depths. For example, deep-sea cables may include an additional layer of aramid fiber (e.g., Kevlar) between the water barrier and sheath to enhance tensile strength (up to 50kN).
Armour Layer: Galvanized steel wire armour (GSWA) is available as an optional add-on. The armour uses steel wires with a diameter of 1.2mm–2.0mm, twisted around the cable in a 1+6 or 1+6+12 configuration. It provides impact resistance (withstands 5kN impact force) and rodent protection (critical for coastal areas with burrowing animals).
Color Coding: The outer sheath can be customized to specific colors (e.g., red for Power Cables, blue for Control cables) to facilitate identification during installation and maintenance.
Termination: Pre-terminated cables use underwater-rated connectors (IP68/IP69K) with materials such as brass (plated with nickel) or 316 stainless steel. The connectors are sealed with O-rings made of nitrile rubber (NBR) or fluorocarbon rubber (FKM) for water tightness.
High Conductivity: With a conductivity of 100% IACS (International Annealed Copper Standard) at 20°C, it minimizes power loss during transmission. For example, a 1000m length of 50mm² copper conductor has a resistance of only 0.0358Ω at 20°C, compared to 0.094Ω for an Aluminum Conductor of the same size.
Corrosion Resistance: ETP copper forms a thin, stable oxide layer (CuO/Cu₂O) when exposed to air or water, preventing further corrosion. In saltwater, this layer is reinforced by the cable’s protective sheaths, ensuring long-term conductor integrity.
Workability: ETP copper is easily drawn into thin strands and twisted, enabling the flexible stranded structure required for underwater installation.
Cross-Linking Process: The XLPE is produced using a peroxide cross-linking method (per IEC 60811-301), which creates strong chemical bonds between polyethylene molecules. This process eliminates the “cold flow” (creep) that plagues standard polyethylene, ensuring the insulation retains its shape and electrical properties under pressure.
Water Resistance: XLPE has a low water absorption rate because cross-linking reduces the number of free molecules that can absorb moisture. This prevents “water treeing”—a common issue in underwater cables where moisture forms conductive paths in the insulation, leading to breakdown.
Thermal Stability: The cross-linked structure allows XLPE to withstand higher temperatures than standard polyethylene, making it suitable for cables that generate heat during high-current operation (e.g., powering offshore wind turbines).
Aluminum-Polyethylene Laminate (ALP): This barrier consists of a thin aluminum foil bonded to a polyethylene layer. The aluminum provides an impermeable barrier to water, while the polyethylene layer adheres to the XLPE insulation, ensuring a tight seal. ALP is lightweight (density ~2.7g/cm³) and cost-effective, making it ideal for shallow and medium-depth cables.
Copper Tape: Copper tape offers superior corrosion resistance compared to aluminum, making it suitable for deep-sea or polluted water environments. It also provides electromagnetic shielding, which is beneficial for cables used in conjunction with sensitive communication equipment (e.g., subsea sensors).
Thermoplastic Polyurethane (TPU): TPU is a elastomeric material known for its exceptional flexibility, abrasion resistance, and oil resistance. It is ideal for cables installed in areas with high mechanical stress (e.g., seabeds with rocks or ship traffic) because it can stretch and recover without cracking. TPU also has good low-temperature flexibility, remaining pliable at -40°C—critical for polar or deep-sea applications.
Chlorosulfonated Polyethylene (CSP): CSP is a chemically modified polyethylene with chlorine and sulfonyl chloride groups. It offers excellent resistance to ozone, UV radiation, and harsh chemicals (e.g., oil, grease, and industrial pollutants). CSP is often used in coastal industrial areas or near oil rigs, where the cable may be exposed to chemical contaminants.
Galvanized Steel Wires: The wires are made from low-carbon steel (S235JR) with a hot-dip galvanized coating (zinc thickness ≥85μm). The zinc coating provides corrosion resistance, while the low-carbon steel offers high tensile strength (≥500MPa).
Aramid Fiber Reinforcement: In deep-sea cables, aramid fiber (e.g., Kevlar) is added to the armour layer. Aramid has a tensile strength five times that of steel (per unit weight) and is resistant to corrosion and high temperatures. It helps the cable withstand the extreme hydrostatic pressure of deep waters and reduces the overall weight of the cable.
Copper Wire Rods: Inspected for purity (via atomic absorption spectroscopy), tensile strength (≥300MPa), and diameter tolerance (±0.02mm). Samples are also tested for conductivity to ensure they meet 100% IACS standards.
XLPE Compound: Tested for melt flow rate (MFR: 0.5g/10min–1.5g/10min at 190°C/2.16kg), density, and electrical insulation properties. A small batch of XLPE is extruded into test samples and subjected to water absorption and dielectric strength tests.
Metallic Barriers: ALP is checked for aluminum foil thickness and adhesion strength; copper tape is tested for thickness, tensile strength, and corrosion resistance (via salt spray testing).
Sheath Materials: TPU and CSP are tested for Shore hardness, tensile strength, elongation at break, and chemical resistance. Samples are immersed in saltwater for 1000 hours to verify no degradation.
Extrusion: The XLPE compound is melted in an extruder (temperature: 120°C–160°C) and forced through a crosshead die (custom-sized for the 50mm² conductor) to form a uniform insulation layer. The extruder uses a screw with a length-to-diameter ratio of 25:1 to ensure thorough mixing of the XLPE compound.
Cross-Linking: The Insulated Conductor passes through a continuous vulcanization (CV) tube (temperature: 200°C–250°C, pressure: 1.5MPa–2.0MPa). In the CV tube, the peroxide in the XLPE compound decomposes, initiating cross-linking of the polyethylene molecules. The cross-linking process takes 2–3 minutes, depending on the insulation thickness.
Cooling: The cross-linked insulated conductor is cooled in a water bath (temperature: 20°C–30°C) to solidify the insulation. A puller unit maintains a constant speed (5m/min–10m/min) to ensure uniform insulation thickness.
Tape Preparation: The ALP or copper tape is unwound from a reel and pre-heated to 60°C–80°C to activate the adhesive (for ALP) or soften the tape (for copper tape), improving adhesion to the XLPE insulation.
Wrapping: The machine wraps the tape around the insulated conductor with 100% overlap (no gaps) and a tension of 50N–80N (adjusted based on tape thickness). For copper tape, an additional conductive adhesive is applied to ensure electrical continuity.
Quality Check: After wrapping, the barrier’s adhesion strength is tested using a peel test (≥5N/cm for ALP, ≥8N/cm for copper tape), and a visual inspection checks for creases or gaps (which could allow water ingress). Defective sections are re-wrapped.
Pre-Heating: The barrier-wrapped conductor is pre-heated to 70°C–90°C to improve adhesion between the barrier and sheath.
Extrusion: The TPU or CSP compound is fed into an extruder with a screw diameter of 90mm–120mm. The extruder temperature is controlled (180°C–200°C for TPU, 160°C–180°C for CSP) to ensure smooth melting. The molten sheath material is forced through a cross-head die to form a uniform layer (thickness: 2.5mm–4.0mm, depending on water depth rating).
Cooling and Sizing: The Sheathed Cable is cooled in a two-stage water bath (first stage: 60°C–70°C, second stage: 20°C–30°C) to prevent shrinkage. A vacuum sizing tank ensures the sheath’s outer diameter is uniform (tolerance: ±0.2mm).
Final Inspection: The cable undergoes a series of tests, including:
Sheath Thickness: Measured using a micrometer (12 points around the cable).
Impact Resistance: A 1kg weight is dropped from 1m onto the sheath (no cracks allowed).
Water Tightness: The cable is submerged in 3.5% NaCl solution at 80°C for 24 hours, with no water ingress detected using a moisture meter.
Armour Application: For cables with galvanized steel wire armour (GSWA), a wire stranding machine twists steel wires (diameter: 1.2mm–2.0mm) around the sheathed cable in a 1+6 or 1+6+12 configuration. The armour is tested for tensile strength (≥50kN) and adhesion (no wire loosening allowed).
Termination Installation: Pre-terminated cables are fitted with underwater-rated connectors (IP68/IP69K) using a crimping machine (crimp force: 50kN–100kN) to ensure a secure connection. The terminated end is submerged in 3.5% NaCl solution for 48 hours, with no current leakage (tested using a megohmmeter).
Color Coding: The outer sheath is colored using masterbatch additives during extrusion. A spectrophotometer verifies the color matches the customer’s specifications (ΔE ≤1.0, per CIELAB color space).
Application in Offshore Wind Farms:
Use Case: Connecting individual wind turbines to subsea transformers (array cables) and subsea transformers to onshore grids (export cables). Offshore wind farms typically operate in water depths of 20m–50m (shallow to medium depth) with exposure to saltwater, strong currents, and potential impact from floating debris.
Cable Configuration: For array cables (connecting turbines), the 50mm² cable is configured with a TPU outer sheath (2.5mm thickness) for flexibility and abrasion resistance, plus a metallic water barrier (ALP) to prevent saltwater ingress. For export cables (longer distances, up to 100km), the cable includes an additional galvanized steel wire armour (GSWA) layer to withstand mechanical stress during installation (e.g., pulling from a lay vessel to the seabed) and protect against anchor damage from passing ships.
Performance Benefits: The high-purity copper conductor minimizes power loss (≤3% per 10km), ensuring efficient transmission of electricity generated by wind turbines (typically 2MW–5MW per turbine). The TPU sheath’s resistance to UV radiation and saltwater corrosion extends the cable’s service life to 20–25 years, aligning with the 25-year operational lifespan of most offshore wind farms.
Application in Tidal Turbines:
Use Case: Powering tidal turbines (installed in coastal areas with strong tidal currents, 10m–30m water depth) and transmitting generated electricity to onshore grids. Tidal environments pose unique challenges, including rapid water flow (up to 5m/s) that can cause mechanical abrasion to the cable, and frequent submersion/emersion (during tidal cycles) that tests the cable’s water tightness.
Cable Configuration: The 50mm² cable is customized with a thicker CSP outer sheath (3.0mm thickness) for enhanced abrasion resistance, plus a copper tape water barrier (superior to ALP for long-term water tightness). To withstand tidal currents, the cable is also fitted with a polyurethane (PU) anti-fouling coating to prevent the attachment of barnacles and algae—these organisms can increase drag on the cable, leading to mechanical stress and potential damage.
Performance Benefits: The Stranded Copper Conductor’s flexibility allows the cable to move with tidal currents without breaking, while the CSP sheath’s high tensile strength (≥18MPa) resists abrasion from sand and sediment carried by the water. The anti-fouling coating reduces maintenance costs by eliminating the need for regular cleaning of the cable surface.
Application in Subsea Wellheads:
Use Case: Powering subsea wellhead control systems (which regulate oil/gas flow) and electric submersible pumps (ESPs) used to extract oil from deep reservoirs. Wellheads are typically located at depths of 200m–500m, with cables exposed to high pressure, oil-based drilling fluids, and potential corrosion from hydrogen sulfide (H₂S) in natural gas.
Cable Configuration: The 50mm² cable is designed with a thick CSP outer sheath (3.5mm thickness) resistant to oil and H₂S, plus a reinforced metallic water barrier (copper tape with a stainless steel backing) to withstand high hydrostatic pressure (5MPa for 500m depth). The XLPE insulation is also formulated with anti-aging additives to resist degradation from heat (up to 90°C) generated by ESPs.
Performance Benefits: The copper conductor’s high current-carrying capacity (125A–135A at 500m depth) provides sufficient power for ESPs (which require 50kW–100kW of power), while the H₂S-resistant CSP sheath prevents chemical damage, extending the cable’s service life to 15–20 years. The stainless steel-reinforced water barrier ensures no water ingress even if the outer sheath is damaged by drilling equipment.
Application in ROVs:
Use Case: Supplying power to ROVs (used for inspecting pipelines, repairing wellheads, and collecting data) and transmitting high-speed data between ROVs and offshore platforms. ROV cables (tether cables) must be highly flexible to allow the ROV to maneuver, while withstanding mechanical stress from being pulled and twisted during operation.
Cable Configuration: The 50mm² cable is customized with a ultra-flexible TPU outer sheath (2.0mm thickness, Shore hardness 85A) and a stranded copper conductor with 37 strands (1.38mm diameter) for maximum flexibility (minimum bending radius: 8× cable outer diameter). To support data transmission, the cable is also integrated with two 24 AWG twisted pair copper wires (for Ethernet or RS485 communication) and a foamed polyethylene (FPE) insulation layer to reduce signal interference.
Performance Benefits: The cable’s flexibility allows the ROV to navigate tight spaces (e.g., around pipeline bends) without cable damage, while the TPU sheath’s abrasion resistance protects against scratches from rocks or metal structures. The integrated data wires eliminate the need for separate data cables, reducing the overall weight and complexity of the ROV tether system.
Application in Submersible Pumps:
Use Case: Powering submersible pumps in flood control systems (to drain water from low-lying coastal areas) and port drainage systems (to remove saltwater from cargo storage areas). Pumps typically operate in 5m–10m water depth, with cables exposed to saltwater, sediment, and occasional submersion in standing water.
Cable Configuration: The 50mm² cable uses a TPU outer sheath (2.5mm thickness) with UV stabilizers to resist sunlight degradation, plus an ALP water barrier for basic water protection. To simplify installation, the cable is pre-terminated with IP68-rated waterproof connectors (brass with nickel plating) that can be directly plugged into the pump’s power inlet, eliminating the need for on-site termination (which increases the risk of water ingress).
Performance Benefits: The copper conductor’s current-carrying capacity (140A–150A at 10m depth) supports medium-sized submersible pumps (5kW–15kW), while the UV-stabilized TPU sheath ensures the cable remains durable even when exposed to direct sunlight for 10+ years. The pre-terminated connectors reduce installation time by 50% compared to field-terminated cables, lowering labor costs.
Application in Underwater Lighting:
Use Case: Powering underwater LED lighting in marine parks, port walkways, and coastal tourist attractions. Lighting systems operate in 1m–5m shallow water, with cables visible to the public and exposed to saltwater, sunlight, and potential impact from swimmers or small boats.
Cable Configuration: The 50mm² cable is customized with a colored TPU outer sheath (e.g., black or blue) to blend with the underwater environment, plus an ALP water barrier. The cable is also designed with a smaller outer diameter (12mm–14mm) to minimize visual impact, while maintaining the 50mm² conductor cross-section for power transmission.
Performance Benefits: The copper conductor’s low resistance ensures stable power supply to LED lights (preventing flickering), while the colored TPU sheath enhances the aesthetic appeal of the lighting system. The cable’s small diameter makes it easy to hide along underwater structures (e.g., rock formations, concrete walls), reducing the risk of damage from human activity.
Application in Underwater Aerators:
Use Case: Powering submersible aerators in fish tanks (freshwater or saltwater) and open-water fish pens (coastal areas, 5m–15m depth). Aerators require continuous power to maintain oxygen levels (critical for fish survival), with cables exposed to water, fish waste, and algae.
Cable Configuration: The 50mm² cable uses a food-grade TPU outer sheath (compliant with FDA 21 CFR Part 177.2600) that is non-toxic and resistant to algae growth. The cable also includes an ALP water barrier and a stranded copper conductor (19 strands) for flexibility, allowing it to be routed around the edges of fish tanks or pens without kinking.
Performance Benefits: The food-grade TPU sheath ensures no toxic substances leach into the water, protecting fish health and complying with aquaculture regulations. The cable’s resistance to algae growth reduces the need for frequent cleaning, lowering maintenance costs. The stranded conductor’s flexibility makes installation easy in confined spaces (e.g., small fish tanks).
Application in Water Temperature Sensors:
Use Case: Transmitting power to and data from underwater temperature sensors in fish farms (to monitor water temperature and adjust feeding schedules). Sensors are typically deployed at depths of 2m–10m, with cables exposed to saltwater and potential damage from fish or farming equipment.
Cable Configuration: The 50mm² cable is integrated with a single 22 AWG copper wire for data transmission (to send temperature readings to a central controller) and a TPU outer sheath (2.5mm thickness) for durability. The cable is also fitted with a small-diameter design (10mm–12mm) to minimize disturbance to fish.
Performance Benefits: The integrated data wire eliminates the need for a separate data cable, simplifying the sensor system. The TPU sheath’s resistance to saltwater and mechanical damage ensures reliable operation for 5–10 years, while the small diameter prevents fish from becoming entangled in the cable.
Drum Material:
Wooden Drums: Made from high-density pine or birch plywood (thickness 20mm–25mm) treated with anti-mold and water-repellent chemicals (e.g., chromated copper arsenate, CCA) to prevent rot during storage in humid environments. Wooden drums are suitable for non-Armoured Cables or cables with light armour (e.g., ALP barrier only).
Steel Drums: Constructed from galvanized steel (thickness 1.5mm–2.0mm) with reinforced flanges (diameter 600mm–1200mm, depending on cable length). Steel drums are used for Armoured Cables (e.g., GSWA) or Heavy-Duty Cables (weight >500kg per drum), as they provide superior structural support to withstand the cable’s weight.
Cable Protection on Drums:
Before winding, the cable is wrapped in a layer of moisture-proof polyethylene (PE) film (thickness 0.1mm) to prevent moisture from reaching the cable surface during storage.
A layer of abrasion-resistant kraft paper (weight 120g/m²) is wrapped over the PE film to protect the outer sheath from scratches during winding and transportation.
For armoured cables, additional foam padding (thickness 5mm) is placed between the cable layers to prevent friction between the armour and sheath.
Drum Labeling and Documentation:
Each drum is labeled with a weather-resistant sticker containing critical information: product model (50mm² underwater copper cable), Conductor Material (high-purity copper), sheath material (TPU/CSP), water depth rating (shallow/medium/deep), length (e.g., 1000m), batch number, production date, and manufacturer contact information.
A plastic envelope attached to the drum contains documentation, including a Certificate of Conformity (CoC) (verifying compliance with IEC 60502-2), a Material Safety Data Sheet (MSDS) (for handling and disposal), and a test report (summarizing electrical and mechanical test results).
Box Material: Double-walled corrugated cardboard (thickness 8mm) with a bursting strength of ≥2000kPa—sufficient to withstand stacking and minor impacts during shipping.
Interior Protection: The cable is coiled into a compact circle (diameter 300mm–500mm) and wrapped in bubble wrap (thickness 5mm) to prevent kinking and abrasion. A silica gel packet (10g) is added to the box to absorb residual moisture, ensuring the cable remains dry.
Labeling: The box is labeled with the same product information as bulk drums, plus a “Fragile” sticker to alert logistics providers to handle the package with care. Sample boxes also include a brief product brochure highlighting the cable’s key features and applications.
Indoor Storage: Cables should be stored in a dry, well-ventilated warehouse with a temperature range of -5°C to 40°C and relative humidity ≤70%. Avoid storing near heat sources (e.g., heaters, boilers) or chemicals (e.g., oil, solvents) that could damage the outer sheath.
Drum Storage: Wooden drums should be placed on level ground, with wooden blocks (height 100mm) under the drum ends to prevent rolling. Do not stack wooden drums higher than 2 layers; steel drums can be stacked up to 3 layers (with a weight limit of 1000kg per layer).
Unused Cable: If a drum is partially used, the remaining cable should be rewound tightly onto the drum and covered with the original PE film and kraft paper. The drum should be sealed with tape to prevent moisture and dust ingress. Unused cables should be inspected for sheath damage (e.g., cracks, scratches) before installation.
Shelf Life: When stored correctly, the cable has a shelf life of 3 years from the production date. After 3 years, the cable should undergo electrical testing (insulation resistance, withstand voltage) before use to ensure performance.
Container Shipping: Cables are shipped in 20ft or 40ft standard shipping containers (ISO 6346). Wooden drums are secured to the container floor using steel bolts (M16) and wooden wedges to prevent rolling during rough seas. Steel drums are stacked (up to 3 layers) and secured with steel straps (width 50mm) to the container’s load-bearing points.
Moisture Protection: The container is lined with a moisture-absorbing blanket (100g/m²) to reduce condensation during transit (a common issue in sea shipping). A humidity sensor is placed inside the container to monitor moisture levels, with data accessible to the customer via a mobile app.
Commercial Invoice: Details the product description, quantity, unit price, total value, and payment terms (e.g., FOB, CIF).
Packing List: Itemizes each drum/box, including dimensions, weight, and product specifications (e.g., cable length, water depth rating).
Certificate of Origin (CO): Issued by a local chamber of commerce to verify the cable’s manufacturing origin, which may qualify the customer for import duty reductions under trade agreements (e.g., EU-China Comprehensive Agreement on Investment).
Compliance Certificates: Includes CE marking (for EU destinations), UL certification (for North America), or SABS certification (for South Africa), depending on the target market’s regulatory requirements.
Transit Time and Tracking: Sea transportation typically takes 15–45 days, depending on the route (e.g., China to Europe: 25–35 days; China to North America: 15–25 days). The customer receives a container tracking number (from the shipping line) to monitor the shipment’s progress in real time via the shipping line’s website or mobile app. The manufacturer’s logistics team also provides weekly updates, including port arrival/departure times and any potential delays (e.g., port congestion).
Truck Transportation: Heavy-duty trucks with flatbed or enclosed trailers are used. Enclosed trailers are recommended for long-distance transport (≥500km) to protect the cable from weather (rain, snow) and road debris. Flatbed trailers are suitable for short distances (≤300km) or for oversized steel drums that cannot fit in enclosed trailers. The drums are secured to the trailer using steel straps (tension ≥5kN) and wooden blocks to prevent shifting during transit.
Railway Transportation: For large bulk orders (≥50 drums), railway transportation is more cost-effective than trucks. The cables are shipped in railway containers (ISO 6346) with the same moisture protection measures as sea containers (moisture-absorbing blankets, humidity sensors). Railway transit time is typically 2–7 days for domestic orders and 5–14 days for cross-border orders (e.g., Germany to Poland).
Last-Mile Delivery: For delivery to construction sites or remote coastal areas, the manufacturer coordinates with local logistics providers to ensure the cable reaches the final destination. This may involve using smaller trucks with off-road capabilities or partnering with port authorities to arrange barge transportation for island destinations.
Cargo Planes: Cables are shipped in air cargo containers (ULD containers) with weight limits of 100kg–1000kg. Small-length cables (10m–50m) are packaged in cardboard boxes, while longer lengths (100m–500m) are wound onto lightweight aluminum drums (to reduce shipping weight).
Speed and Cost: Air transportation takes 2–7 days worldwide (e.g., China to the US: 3–5 days), making it ideal for time-sensitive projects. However, it is 3–5 times more expensive than sea freight, so it is recommended only for urgent needs.
Regulatory Compliance: The manufacturer ensures compliance with air cargo regulations, including labeling hazardous materials (if applicable) and providing a Shipper’s Declaration for Dangerous Goods (SDDG) if the cable’s materials (e.g., PVC Insulation) are classified as hazardous.
Physical Damage: Damage from accidents (truck collisions, ship grounding), natural disasters (hurricanes, floods), or improper handling (dropping drums during loading/unloading).
Loss or Theft: Coverage for complete loss of the shipment (e.g., stolen containers) or partial loss (e.g., missing drums).
Claim Process: If damage occurs, the customer must notify the manufacturer and insurance provider within 48 hours of receiving the shipment. The customer provides photos/videos of the damage, a copy of the delivery receipt, and a detailed damage report. The insurance provider assesses the claim within 5–10 working days and arranges for compensation (repair, replacement, or refund) based on the extent of the damage. The insurance premium is typically 0.3%–0.5% of the order value, which can be added to the total order cost or paid separately.
Order Confirmation: The sales team sends a formal order confirmation within 24 hours, outlining the product specifications (conductor size, sheath material, water depth rating), quantity, delivery date, and payment terms. The customer reviews and signs the confirmation to confirm agreement.
Production Scheduling: For standard configurations (e.g., 50mm² TPU-sheathed cable for shallow water), production begins within 3–5 working days. For customized configurations (e.g., deep-sea cables with stainless steel armour or integrated data wires), production takes 10–15 working days, as additional time is needed to adjust manufacturing equipment (e.g., extrusion dies for thicker sheaths) and test the customized design.
Quality Inspection and Packaging: After production, the cable undergoes a 1–2 day quality inspection (electrical, mechanical, and environmental tests). Once approved, the cable is packaged into drums/boxes and prepared for shipping. The manufacturer notifies the customer when the shipment is ready, providing details such as the number of drums, total weight, and shipping documents.
Pre-Delivery Notification: The logistics team sends a pre-delivery notification 3–5 days before the shipment arrives, including the estimated delivery date, time window (e.g., 9 AM–3 PM), and the name of the delivery driver/contact person.
Site Preparation Guidance: The manufacturer provides guidance on site preparation to ensure smooth delivery, such as:
Ensuring the delivery area has sufficient space for the truck (minimum 10m × 5m for a flatbed trailer).
Preparing a level surface for unloading drums (to prevent tipping).
Arranging for lifting equipment (e.g., a forklift or crane) if the drums weigh >500kg (steel drums for armoured cables typically weigh 800kg–1200kg).
Delivery Delay Management: If a delay occurs (e.g., due to logistics issues or production delays), the manufacturer notifies the customer immediately and provides a revised delivery date. The manufacturer also offers compensation for delays caused by its own negligence (e.g., late production), such as a 1% discount on the total order value for each day of delay (up to 10% maximum).
Quantity Verification: The customer checks that the number of drums/boxes matches the packing list. Any discrepancies (e.g., missing drums) must be noted on the delivery receipt and reported to the manufacturer within 24 hours.
Package Integrity Check: The customer inspects the drums/boxes for signs of damage (e.g., broken drum flanges, torn cardboard, water stains). If damage is found, the customer takes photos/videos as evidence and notifies the manufacturer and logistics provider within 48 hours (for insurance claims).
Product Specification Check: For a random sample of drums, the customer verifies the cable’s specifications (e.g., conductor size, sheath material) by checking the drum labels and comparing them to the order confirmation. If the specifications do not match, the customer can reject the shipment and request a replacement.
Acceptance Confirmation: If no issues are found, the customer signs the delivery receipt to confirm acceptance. The manufacturer sends a copy of the signed receipt to the customer for their records.
Standard Samples: 1m–5m lengths of the cable, suitable for laboratory testing (e.g., electrical performance, material composition) or visual inspection. Standard samples are available for all sheath materials (TPU/CSP), water depth ratings, and conductor stranding configurations.
Customized Samples: For customers with unique requirements (e.g., specific anti-fouling coatings, integrated data wires), customized samples can be produced. These samples typically take 7–10 working days to manufacture and are available in 5m–10m lengths.
Installation Trial Samples: 10m–20m lengths of the cable, designed for on-site installation trials. These samples allow customers to test the cable’s flexibility, ease of termination, and compatibility with existing equipment (e.g., submersible pumps, ROVs).
Submit Sample Request Form: The customer completes a sample request form, providing details such as:
Product specifications (conductor size, sheath material, water depth rating, customization requirements).
Sample length and quantity.
Intended use (laboratory testing, installation trial, or client presentation).
Shipping address, contact person, and phone number.
Sample Quotation: For standard samples, the manufacturer provides the sample free of charge (the customer only covers shipping costs). For customized samples, the manufacturer provides a quotation (typically \(50–\)200, depending on the complexity of the customization) within 2 working days.
Payment and Shipping: For fee-based customized samples, the customer makes payment via bank transfer or online payment platforms (e.g., PayPal). Once payment is received, the manufacturer ships the sample via the customer’s preferred logistics method (e.g., DHL, FedEx) within 3–5 working days. A tracking number is provided to the customer for real-time shipment monitoring.
Certificate of Analysis (COA): Summarizes the results of tests conducted on the sample, including insulation resistance (≥1000MΩ·km), tensile strength of the sheath (≥18MPa), and hydrostatic pressure resistance (per the water depth rating).
Material Safety Data Sheet (MSDS): Provides information on the cable’s materials, including hazards, handling precautions, and disposal guidelines. This is particularly important for customers in industries with strict safety regulations (e.g., oil and gas, aquaculture).
Testing Guide: Includes instructions for conducting basic tests on the sample (e.g., measuring conductor resistance with a multimeter, checking sheath flexibility by bending the cable). For customers requiring third-party testing, the manufacturer can coordinate with accredited laboratories (e.g., SGS, TÜV) to conduct advanced tests (e.g., H₂S corrosion resistance, UV degradation) and provide test reports.
Pre-Installation Support: Before installation, the technical team provides guidance on:
Cable routing (e.g., avoiding sharp bends that could damage the sheath, maintaining the minimum bending radius of 8×–12× the cable’s outer diameter).
Termination methods (e.g., using waterproof connectors, applying heat-shrinkable sleeves to seal terminations).
Compatibility with other equipment (e.g., ensuring the cable’s current-carrying capacity matches the power requirements of submersible pumps).
Installation tools and equipment (e.g., recommending cable pullers for long-length installations, providing specifications for lifting equipment for heavy drums).
On-Site Technical Support: For large-scale projects (e.g., offshore wind farms, oil rigs), the manufacturer can dispatch engineers to the customer’s site to provide hands-on support:
Inspecting the installation site to ensure it meets safety and technical requirements.
Providing training to the customer’s installation team on proper cable handling and termination.
Conducting on-site tests (e.g., insulation resistance tests, continuity tests) after installation to verify the cable’s performance.
Troubleshooting any technical issues during installation (e.g., resolving termination leaks, adjusting cable routing to reduce mechanical stress).
Remote Technical Support: For smaller projects or urgent issues, the technical team offers remote support via phone, email, or video call (e.g., Zoom, Microsoft Teams). The team can provide real-time guidance on troubleshooting (e.g., identifying the cause of a short circuit, recommending repairs for minor sheath damage) and can review photos/videos of the installation to provide feedback.
1-Year Warranty: For standard shallow-water cables (≤10m depth) with TPU or CSP sheaths and no armour.
2-Year Warranty: For medium-depth cables (10m–500m depth) with reinforced water barriers (copper tape) and optional GSWA.
3-Year Warranty: For deep-sea cables (≥500m depth) with stainless steel-reinforced barriers and heavy-duty GSWA.
Insulation breakdown due to poor XLPE quality.
Sheath cracking or peeling due to defective TPU/CSP material.
Conductor corrosion due to inadequate water barrier protection.
Improper installation (e.g., exceeding the minimum bending radius, using non-waterproof terminations).
Misuse (e.g., using a shallow-water cable in deep-sea conditions, exposing the cable to chemicals not specified in the MSDS).
External factors (e.g., anchor damage, marine life attacks, natural disasters).
Notify the Manufacturer: The customer notifies the manufacturer’s after-sales team within 7 days of discovering the defect, providing details such as the order number, batch number, date of delivery, and a description of the defect.
Provide Evidence: The customer submits photos/videos of the defect, a copy of the delivery receipt, and any test reports (e.g., insulation resistance test results) to support the claim.
Defect Assessment: The manufacturer’s technical team assesses the defect to determine if it is covered by the warranty. This may involve requesting a sample of the defective cable for laboratory testing (the manufacturer covers the cost of sample shipping).
Claim Resolution: If the defect is covered by the warranty, the manufacturer offers one of the following resolutions:
Replacement: The manufacturer sends a new cable of the same specifications to replace the defective one, with the manufacturer covering all shipping and handling costs.
Repair: For minor defects (e.g., small sheath damage), the manufacturer sends a repair kit (including waterproof sealant, heat-shrinkable sleeves) and provides guidance on how to repair the cable.
Refund: If replacement or repair is not feasible (e.g., the defect affects the entire shipment), the manufacturer offers a full or partial refund based on the extent of the defect.
Maintenance Guidelines: A comprehensive maintenance manual, outlining:
Regular inspection schedules (e.g., visual checks every 6 months for shallow-water cables, annual electrical tests for deep-sea cables).
Cleaning procedures (e.g., using a soft brush to remove algae from the sheath, avoiding harsh chemicals that damage TPU/CSP).
Troubleshooting tips (e.g., how to identify moisture ingress using a megohmmeter, steps to repair minor sheath scratches).
Periodic Maintenance Services: For large-scale customers (e.g., offshore wind farm operators), the manufacturer offers annual maintenance visits, where engineers:
Conduct electrical tests (insulation resistance, withstand voltage) to detect early signs of degradation.
Inspect the cable’s sheath and armour for damage (e.g., corrosion, abrasion) and recommend repairs if needed.
Update the customer on best practices for cable maintenance (e.g., new anti-fouling treatments for coastal applications).
Lifecycle Management: The manufacturer provides guidance on end-of-life disposal of the cable, ensuring compliance with environmental regulations (e.g., recycling Copper Conductors, properly disposing of PVC insulation in accordance with EU WEEE directives).
Hongtai Cable Technology Co., Ltd
E-mail: export@qlcables.com
sales@qlcables.com
Tel / WhatsApp: + 86-18032066271
Ajouter: Zone de développement industriel de Xiaokou, comté de Ningjin, City de Xingtai ， Province de Hebei, Chine
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