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Hydraulic hose for railway applications DN20 1SN 105 bar

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Hydraulic hose for railway applications DN20 1SN 105 bar (EN 45545-2)

Specialized hydraulic hose for railway applications DN20 1SN with a working pressure of 105 bar is a flexible pressure line with a single steel braid, designed for the rigorous requirements of rail transport and rolling stock. The hose meets the European fire protection standard EN 45545-2, making it suitable for use in locomotives, passenger cars, multiple units, as well as trams and track machinery. The outer cover made of flame-retardant, self-extinguishing synthetic rubber is characterized by very low emission of smoke and toxic gases in case of fire. The hose is intended for leak-free transport of mineral oils, synthetic oils, hydraulic fluids, water-glycol solutions, water, and compressed air in drive, control, and auxiliary systems.

Application, construction and advantages of the railway hose DN20 1SN

In rail vehicle installations, flexible pressure connections are subjected to vibrations, temperature changes, and atmospheric factors. The railway hose DN20 1SN 105 bar combines mechanical strength with the fire requirements of the rail industry.

EN 45545-2 fire certification: The outer synthetic rubber meets requirements for flammability and low exhaust gas toxicity (levels HL1, HL2, HL3).
Compliance with hydraulic standards: Manufactured according to EN 853 1SN and SAE 100 R1AT standards, allowing use with standard crimped fittings.
Single-braid steel construction: Reinforcement with a single high-strength steel braid provides flexibility and a small bending radius at a working pressure of 105 bar.
Wide operating temperature range: From -40°C to +100°C (momentarily up to +125°C), enabling stable operation in winter conditions and with hot oil.
Environmental resistance: The rubber cover shows resistance to abrasion, ozone, UV radiation, petroleum fluids, and atmospheric factors.

What to combine the DN20 1SN railway hose with and how to avoid assembly errors?

The hydraulic hose for railway applications DN20 1SN (inner diameter 3/4" – approx. 19.0 mm) works with standard power hydraulics fittings:

Crimped hose fittings: Standard metric fittings (DKOL/DKOS, CEL/CES), inch BSP (DKR, AGR), JIC, and ORFS sealed with T20 or T21 DN20 (3/4") crimp ferrules.
Working media: Petroleum-based hydraulic oils, synthetic esters, cooling liquids (glycol), water, and compressed air.

When selecting and installing railway lines, the required working pressure of the system must be carefully verified. For DN20 (3/4") diameter, the 1SN version offers a working pressure of 105 bar with a 4:1 safety factor (burst pressure is min. 420 bar). If the system requires higher pressure (e.g., up to 215 bar), a double-braid 2SN version should be used. The correct ferrule crimping on the machine depends on the crimping table provided by the fittings and hose manufacturer.

Technical specification

Technical parameter	Value / Description
Product name	Hydraulic hose for railway applications DN20 1SN 105 bar
Nominal diameter (DN)	DN20 (3/4" inch / approx. 19.0 mm)
Construction type / Braid	1SN (1 high-strength steel wire braid)
Maximum working pressure	105 bar
Burst pressure	420 bar (4:1 safety factor)
Railway fire standard	EN 45545-2 (levels HL1 / HL2 / HL3)
Hydraulic standards	EN 853 1SN, SAE 100 R1AT, ISO 1436
Operating temperature range	from -40°C to +100°C (momentarily up to +125°C)
Inner / outer layer	Oil-resistant synthetic rubber / flame-retardant ozone-resistant rubber

Frequently Asked Questions (FAQ)

What does the EN 45545-2 standard mean for a hydraulic hose?

The EN 45545-2 standard specifies the fire property requirements for materials used in rail vehicles. A hose meeting this standard has a flame-retardant outer cover that limits fire spread and emits a small amount of smoke and toxic gases.

Do standard fittings and ferrules fit the DN20 1SN railway hose?

Yes, the geometric dimensions of the 1SN hose compliant with EN 45545-2 correspond to the standard EN 853\. Common hydraulic fittings and T20 or T21 DN20 crimp ferrules are used for assembly.