China Professional Metal Hose Manufacturer

The Metal Hose serves as a fundamental component in countless industrial, commercial, and residential fluid transfer systems. Engineered to absorb vibration, compensate for thermal expansion, and correct misalignment, these flexible conduits ensure safe, reliable operation under demanding conditions. JIDONGDA has advanced the design and manufacturing of metal hose assemblies through rigorous material selection, precision corrugation processes, and thorough end fitting integration.

Key Product Parameters and Configurations

• Nominal Diameter (DN): Ranges from DN6 (1/4 inch) to DN300 (12 inches) and beyond for large-scale industrial piping.
• Working Pressure (PW): Typically from full vacuum to 350 bar depending on diameter, number of braid layers, and corrugation thickness.
• Burst Pressure (PB): Engineered with a safety factor of 4:1 relative to working pressure for standard assemblies.
• Temperature Range: Standard stainless steel assemblies operate from -200°C to +600°C; high-temperature alloys extend this to 800°C or more.
• Bend Radius: Static and dynamic minimum bend radii are specified per diameter to prevent overstress.
• Flexibility & Stroke Length: Defined by axial compression, extension, lateral offset capacity, and angular movement.
• End Fittings: Flanged, threaded, weld ends, sanitary, camlock, or custom designs.

Frequently Asked Questions

What is the difference between annular and helical corrugated metal hose, and which does JIDONGDA recommend?

Annular corrugated hose consists of a series of uniform, parallel rings, offering superior flexibility, a tighter bend radius, and higher pressure capacity due to more effective braid reinforcement. Helical corrugated hose has a continuous spiral profile, generally providing lower flexibility and pressure ratings but sometimes lower cost for non-critical static applications. JIDONGDA primarily manufactures annular corrugated hose because it delivers better overall performance, longer fatigue life, and compatibility with full-vacuum conditions. For applications that do not demand high flexibility, helical versions can be supplied on request after a careful engineering review.

How do I determine the correct length of a metal hose assembly for vibration absorption?

For vibration absorption, the assembly must be long enough that the imposed motion does not force the hose to bend below its dynamic minimum bend radius. The live length—the portion of the hose free from end fitting constraints—should be at least 10 times the nominal diameter for simple lateral vibration, and longer when both vibration amplitude and frequency are high. JIDONGDA's application engineers can perform a motion analysis using your displacement data to recommend the precise free length required, preventing premature fatigue failure.

Can a metal hose be used under full vacuum without collapsing?

Yes, JIDONGDA annular corrugated hoses with full braid coverage are rated for full vacuum service. The corrugation profile is specifically designed so that the external braid prevents squirming or buckling when internal pressure falls below atmospheric pressure. For critical high-vacuum applications in elevated temperature, the system should be reviewed to confirm that the material maintains sufficient strength. In such cases, a liner may be incorporated to ensure structural stability.

What causes braid wear and how can it be prevented?

Braid wear predominantly results from abrasion against adjacent structures, rubbing from excessive motion, or fretting between the braid and the corrugated core. Inter-braid contact during cyclic movement can also generate localized wear. Preventive measures include installing the hose with adequate clearance, using protective outer covers such as interlock armor or silicone jackets, and avoiding installation layouts that cause braid-to-braid or braid-to-structure contact. JIDONGDA can factory-fit protective sleeves that significantly extend assembly life in abrasive environments.

How are JIDONGDA assemblies tested before shipment?

Every assembly undergoes a hydrostatic pressure test at 1.5 times the rated working pressure, with a hold time according to international standards. For gas service, a pneumatic test under controlled conditions is performed. Additional non-destructive testing, such as dye penetrant inspection on welds, positive material identification (PMI), and helium leak detection, is available upon request. Burst testing on sample assemblies from each production batch is regularly conducted to validate design margins. Certificates of conformance and test reports are standard documentation.