Metal hose is a flexible pipe component widely used in industry, construction, energy and other fields. It has the characteristics of pressure resistance, corrosion resistance and fatigue resistance.

Basic structure and composition
Bellows: core components, usually made of stainless steel (such as 304, 316L), with flexibility achieved through spiral or annular corrugated structures.

Braided mesh: a metal wire braid (such as stainless steel wire) covering the outer layer of the bellows to enhance pressure bearing capacity and resistance to mechanical damage.

Connectors: connectors at both ends, in various forms (threads, flanges, quick connectors, etc.), the material must match the bellows.

Technical parameter of metal hose flexible
Nominal diameter DN	Inner diameter	Outer diameter		Minimum bending radius		Working pressure
Nominal diameter DN	Inner diameter	Bellows	Braid mesh	Static	Dynamic	Single braid mesh	Double braid mesh
8	8.8	13.2	14.4	50	110	15	20
10	11.7	16.5	17.7	65	145	185	20
15	13.5	19.5	21.1	80	180	18	20
20	20.0	27	28.6	120	270	10	15
25	27.0	34.5	36.1	160	360	6.3	10
32	32.0	40	41.6	175	400	4.0	6.3
40	39.6	52	53.6	225	510	4.0	6.3
50	49.7	62	63.6	280	640	3.0	5.0
65	61.2	80.2	81.8	410	915	3.0	5.0
80	79.0	96.3	97.9	486	1030	3.0	5.0
100	101.2	119.6	121.2	610	1340	2.5	4.0
125	124.1	145.3	146.9	700	1540	2.5	4.0
150	149.4	180.8	182.4	810	1780	2.5	4.0
200	176.0	240	243.2	1000	2000	2.5	4.0
250	248.0	290	294	1250	2500	2.5	4.0
300	298.0	350	354	1500	3000	1.6	2.5
350	347.0	400	404.8	1750	3500	1.6	2.5
400	397.6	460	464.8	2000	4000	1.6	2.5

Main classification
By use:

General purpose: used for liquid and gas transportation.

High temperature/low temperature resistant: suitable for extreme temperature environments.

Corrosion resistant: used in corrosive environments such as chemical and marine.

By structure:

Single-layer/multi-layer bellows: multi-layer structure can withstand higher pressure.

With armor (braided mesh) or without armor: armor enhances compressive and tensile strength.

Application areas
Industrial pipelines: compensation for thermal expansion, shock absorption, connection equipment (such as pumps, valves).

Petrochemical/Chemical: transportation of acids, alkalis, oil and gas, etc.

Building HVAC: flexible connections in air conditioning and fire protection systems.

Aerospace/Automobile: fuel and hydraulic system pipelines.

Installation specifications:

Avoid twisting or excessive bending, the bending radius ≥ the design value.

Reserve length to compensate for thermal expansion and contraction.

Prevent the bellows from twisting when the joint is tightened.

Maintenance inspection:

Regularly check for leaks, mesh damage or bellows deformation.

Pay attention to surface cleaning in corrosive environments.

Metal Hose Inventory

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