Internal Ducting: Temperature Range -40°C to +120°C

Q: What is the primary function of internal ducting in articulated arms?

To safely route air, hydraulic fluid, or coolant through moving joints without external exposure, preventing hose entanglement and protecting media lines from damage during operation.

Q: How does internal ducting differ from external hoses?

Internal ducting is integrated within the arm structure, offering protection from environmental factors and mechanical interference, while external hoses are exposed and prone to snagging or wear.

Q: What materials are best for high-flexibility applications?

Polyurethane or thermoplastic elastomers with stainless steel braiding provide excellent flexibility, pressure resistance, and durability for dynamic motion.

Component Specifications

Definition

Internal ducting is a specialized flexible conduit system integrated within articulated arm sections of industrial machinery, designed to transport air, hydraulic fluid, coolant, or other media through moving joints without external exposure. It enables continuous media flow during arm articulation, preventing hose entanglement and protecting media lines from environmental damage. Key features include multi-axis flexibility, pressure resistance, abrasion protection, and compatibility with robotic motion cycles.

Working Principle

Operates by using flexible, reinforced tubing or corrugated conduits that bend and twist within the arm's hollow sections as joints articulate. The ducting maintains a sealed pathway for media transfer, often incorporating swivel joints or rotary unions at pivot points to allow continuous flow during rotation. It minimizes stress on connections through controlled bend radii and strain relief, ensuring media integrity across the arm's range of motion.

Materials

Typically constructed from polyurethane, thermoplastic elastomers (TPE), or reinforced rubber for flexibility, with internal layers of nylon, polyethylene, or PTFE for media compatibility. Reinforcement may include stainless steel braiding, aramid fibers, or textile spirals for pressure resistance. Fittings are often stainless steel (AISI 304/316) or aluminum with NBR or FKM seals.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flex Life	>1 million cycles
Bend Radius	4x diameter minimum
Inner Diameter	6-25 mm
Pressure Rating	Up to 25 bar
Temperature Range	-40°C to +120°C
Media Compatibility	Air, water, hydraulic oil, coolants

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 18752, DIN 20018, ISO 11425

Parent Products

This component is used in the following industrial products

Articulated Arm Sections

Segmented components that form the flexible arm structure of extraction hoods/arms, enabling adjustable positioning for fume capture.

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Engineering Analysis

Risks & Mitigation

Leakage at joints
Abrasion from internal surfaces
Fatigue failure from cyclic bending
Media incompatibility causing degradation
Over-pressurization leading to burst

FMEA Triads

Trigger: Improper bend radius during installation
Failure: Premature cracking or kinking of ducting
Mitigation: Follow manufacturer bend radius guidelines; use bend restrictors if needed

Trigger: Incompatible media causing chemical degradation
Failure: Internal layer deterioration leading to leaks
Mitigation: Verify media compatibility with material specs; use lined ducting if required

Trigger: Excessive cyclic stress at pivot points
Failure: Fatigue failure of reinforcement layers
Mitigation: Incorporate swivel joints; ensure proper strain relief; monitor flex life cycles

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5 mm on inner diameter; leak rate <0.1% of flow rate at rated pressure

Test Method

Pressure cycling test per ISO 18752; flex life test per DIN 20018; burst pressure test

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Internal Ducting

Manufacturer profiles associated with Internal Ducting.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of internal ducting in articulated arms?