Ship Multi-Core Tube Solutions
Huaxiao-Alloy’s Ship Multi-Core Tubes integrate multiple hydraulic, pneumatic, or instrumentation lines into a single, unified assembly. Engineered for shipbuilding, offshore platforms, and industrial plants, these bundled tubes streamline the transport of hydraulic fluids, oils, gases, and control signals while significantly reducing installation complexity and lifecycle costs.
1. Product Overview
A Ship Multi-Core Tube is a prefabricated, bundled tubing system designed to integrate multiple process, control, or instrumentation lines within a single protective sheath. In the shipbuilding and marine industries, these tubes are used to transmit hydraulic pressure, pneumatic signals, lubrication oil, and control fluids safely across long distances — all while maintaining high resistance to corrosion, vibration, and seawater exposure.
Unlike single tubes installed separately, the multi-core tubing system (also known as multi-line tube bundle) simplifies installation, reduces weight and space requirements, and ensures long-term reliability in confined shipboard environments.
Huaxiao-Alloy specializes in stainless steel and copper-nickel multi-core tubes, factory-manufactured under ISO and marine classification standards (ABS, DNV, CCS, LR). With modern production bases in Wuxi, Foshan, and Shanghai Baoshan, Huaxiao-Alloy delivers customized tubing bundles that meet the highest standards of the shipbuilding industry.
2. Construction & Working Principle
The Ship Multi-Core Tube consists of multiple small-diameter tubes — usually 2 to 12 cores — laid parallel or spirally bundled within a common outer sheath. Each core serves as a dedicated flow channel for hydraulic, pneumatic, or signal transmission.
Construction Layers:
Inner Tubes (Cores):
Made of stainless steel 304/316L or copper-nickel (CuNi 70/30, 90/10) for superior corrosion resistance.Filler / Separation Layer:
Thermoplastic or elastomeric material to prevent friction and vibration between cores.Outer Sheath:
Extruded or wrapped PVC / TPU / Stainless Steel armor, providing mechanical and environmental protection.Identification:
Each tube core can be color-coded, numbered, or labeled for easy installation and maintenance.
Working Principle:
Each core functions independently, allowing different fluids or gases to pass simultaneously without cross-contamination. The bundled configuration minimizes installation space, reduces the number of clamps and fittings, and simplifies routing across ship decks and compartments.
3. Technical Specifications
| Item | Specification |
|---|---|
| Number of Cores | 2 to 12 (customizable) |
| Tube Material | Stainless Steel 304 / 316L / CuNi 70/30 / CuNi 90/10 |
| Tube OD | 3 mm – 12 mm |
| Tube Wall Thickness | 0.5 mm – 2.0 mm |
| Operating Pressure | Up to 250 bar (depending on material) |
| Operating Temperature | -196°C to +400°C |
| Outer Sheath Material | PVC, TPU, PE, or SS armor |
| Sheath Thickness | 1.5 mm – 3.0 mm |
| Bundling Type | Parallel / Helical (spiral) |
| Length per Coil | Up to 300 meters continuous |
| Marking | Color code / Laser print / Core numbering |
| Standards | ASTM A269, ASTM B466, DIN 74234, ISO 9001, ABS / DNV / CCS |
| Fire Resistance | IMO Resolution A.653(16) compliant (optional) |
| Testing | Hydrostatic, Pneumatic, Helium Leak, Electrical Continuity (if applicable) |
4. Material Options & Properties
(A) Stainless Steel (304 / 316L)
Excellent mechanical strength and corrosion resistance.
Suitable for hydraulic and pneumatic control lines.
Ideal for engine room, machinery spaces, and high-pressure systems.
(B) Copper-Nickel (CuNi 70/30 and 90/10)
Outstanding seawater corrosion resistance.
Widely used in cooling, bilge, ballast, and seawater piping systems.
Resistant to biofouling and stress corrosion cracking.
Preferred in LNG carriers, naval vessels, and offshore platforms.
Comparison Table:
| Property | SS316L | CuNi 70/30 | CuNi 90/10 |
|---|---|---|---|
| Density (g/cm³) | 8.0 | 8.9 | 8.9 |
| Max. Temp (°C) | 400 | 350 | 325 |
| Tensile Strength (MPa) | 550 | 420 | 350 |
| Corrosion Resistance (Seawater) | Excellent | Excellent | Very Good |
| Cost | Moderate | Higher | High |
Huaxiao-Alloy can manufacture hybrid configurations, combining SS and CuNi cores in one bundle, offering optimal balance between cost and corrosion resistance.
5. Features & Advantages
(1) Space-Saving Design
Multi-core configuration reduces the number of separate runs — saving up to 70% of routing space in ship compartments.
(2) Simplified Installation
Delivered in ready-to-lay bundles; reduces installation time, fittings, and potential leak points.
(3) High Corrosion Resistance
316L stainless steel and copper-nickel materials ensure excellent resistance against saltwater, humidity, and oil vapors.
(4) Mechanical Protection
Outer sheath shields tubes from vibration, impact, and mechanical damage during operation.
(5) Lightweight & Flexible
Helically bundled design allows tight bending radii — perfect for narrow passageways and confined shipboard spaces.
(6) Fire-Resistant Options
Optional flame-retardant outer jacket complies with IMO A.653(16) and IEC 60332 fire standards.
(7) Easy Identification
Color-coded or laser-marked core tubes simplify maintenance and reduce risk of connection errors.
(8) Leak-Free & Low Maintenance
Fewer fittings and joints mean reduced leak potential and easier long-term service.
(9) Custom Engineered
Huaxiao-Alloy designs each multi-core tube to meet specific system requirements — from pressure rating to sheath type.
6. Applications
Huaxiao-Alloy Ship Multi-Core Tubes are used in a wide range of marine and offshore systems, including:
Hydraulic Control Systems: Steering, stabilizer, and hatch operations.
Pneumatic Systems: Air control and automation lines.
Lubrication Systems: Oil feed lines for engines and compressors.
Fuel Systems: Transfer and control lines for marine diesel and heavy oil.
Instrumentation & Monitoring: Pressure and temperature signal transmission.
Firefighting Systems: Control signal tubing for CO₂ and foam extinguishing systems.
Cooling Water Systems: Copper-nickel cores used for seawater intake and discharge control.
Ballast & Bilge Systems: Corrosion-resistant bundles for long-term seawater exposure.
Offshore Platforms: For subsea hydraulic and control tubing applications.
7. Installation & Handling Guidelines
Proper handling of multi-core tubing ensures safe, long-term performance.
Preparation:
Verify system design and layout before uncoiling.
Check tube identification and direction markings.
Routing:
Avoid sharp bends; maintain minimum bending radius of 10× outer diameter.
Use standard clamps and supports at 0.5–1.0 m intervals.
Connection:
Terminate cores using compression or welded fittings.
For CuNi tubes, use silver-brazed or compression-type joints.
Testing:
Conduct hydrostatic or pneumatic leak test after installation.
For critical systems, helium leak detection may be performed.
Maintenance:
Periodic visual inspection for sheath damage or corrosion.
Replace or reseal damaged outer jackets immediately.
8. Quality Control & Certifications
Huaxiao-Alloy maintains rigorous quality assurance in every stage of production:
Material Testing: 100% chemical and mechanical testing per ASTM and DIN standards.
Hydrostatic Test: 1.5× design pressure for each tube.
Helium Leak Test: Ensures absolute tightness for instrumentation lines.
Dimensional & Surface Inspection: Visual and laser-based QA systems.
Marking & Traceability: Each tube and bundle is fully traceable with serial numbers and material certificates.
Certifications & Approvals
ISO 9001 Quality Management System
ABS (American Bureau of Shipping)
DNV (Det Norske Veritas)
CCS (China Classification Society)
LR (Lloyd’s Register)
BV (Bureau Veritas)
Optional compliance with:
IMO Fire Test Code
ASTM A269 / B466 / B111
EN 10204 3.1 Material Certification
9. Why Choose Huaxiao-Alloy
(1) Comprehensive Marine Tubing Manufacturer
Huaxiao-Alloy integrates metal tube manufacturing, insulation, sheathing, and bundling in one system — ensuring full control over quality and delivery.
(2) Wide Material Range
From stainless steel to copper-nickel alloys, our solutions cover the full spectrum of marine corrosion resistance and mechanical performance.
(3) Tailored Marine Solutions
We design custom multi-core configurations to match specific shipboard systems, fluid types, and class approval needs.
(4) Global Export Expertise
With customers in Europe, Southeast Asia, the Middle East, and South America, Huaxiao-Alloy is a trusted supplier for international shipyards and EPC contractors.
(5) Fast Production & Delivery
Standard bundles kept in stock, customized assemblies produced within short lead times.
(6) Technical Support
Professional engineers provide system design consultation, routing recommendations, and material selection guidance.
10. Frequently Asked Questions (FAQs)
Q1: What is a Ship Multi-Core Tube?
A: It’s a factory-bundled group of multiple small tubes enclosed in one protective sheath, used for hydraulic, pneumatic, or control fluid transfer in marine systems.
Q2: Why use multi-core tubes instead of single tubes?
A: Multi-core bundles simplify installation, reduce space, minimize leaks, and provide better mechanical protection compared to multiple single runs.
Q3: What materials are available?
A: Huaxiao-Alloy offers stainless steel (304 / 316L) and copper-nickel (CuNi 70/30 and 90/10) for superior corrosion resistance in seawater environments.
Q4: How many cores can be included?
A: Typically 2–12 cores, but larger bundles are available upon request.
Q5: Are these tubes certified for marine use?
A: Yes. We supply products approved by ABS, DNV, CCS, LR, and BV.
Q6: Can I order mixed material cores (SS + CuNi)?
A: Yes. Hybrid configurations are available for cost and performance optimization.
Q7: What outer sheath materials are used?
A: PVC, TPU, PE, or stainless steel armor, depending on temperature and mechanical requirements.
Q8: How are the tubes identified?
A: Each core can be color-coded, numbered, or laser-engraved for easy installation.
Q9: What’s the maximum operating pressure?
A: Up to 250 bar, depending on tube diameter and wall thickness.
Q10: Does Huaxiao-Alloy provide OEM or custom configurations?
A: Absolutely. We offer full customization based on drawings or technical requirements.
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