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Hydraulic Hoses & Fittings — Frequently Asked Questions
What working pressure rating is required for hydraulic elevator hoses?
Hydraulic elevator circuits typically operate at 100–250 bar depending on the cylinder design and load. Standards require hoses to be rated to a minimum 4:1 safety factor over maximum working pressure. For a 200-bar system, hoses rated at 800 bar burst pressure are therefore the minimum. Always verify the rated working pressure (RWP) on the hose assembly test certificate against your system's actual maximum operating pressure including any pressure spikes.
How often should hydraulic hoses be replaced on elevator systems?
TS EN 13015 requires maintenance plans to include scheduled replacement of wear items. Most hose manufacturers recommend a maximum service life of 6 years for hydraulic elevator hoses regardless of visual condition, because internal degradation and micro-cracking are not visible externally. High-temperature environments or hoses subject to frequent flexing may require more frequent replacement. Document replacement dates in the elevator logbook to demonstrate TS EN 13015 compliance.
What is the ISO 4406 standard and why does it matter for hydraulic elevator fittings?
ISO 4406 defines a cleanliness code for hydraulic fluids based on particle count per millilitre. Contaminated hydraulic fluid — often introduced via poorly cleaned fittings during assembly or maintenance — is a leading cause of valve wear and seal failure in hydraulic elevator power units. Specifying ISO 4406 class 17/15/12 or better for new hose assemblies and using sealed, capped fittings in storage significantly extends power-unit life.
Are there environmental containment requirements for hydraulic elevator hose circuits?
Yes. EN 81-20 §5.5 (for machine rooms) and fire safety codes require measures to prevent hydraulic oil from reaching fire sources or drainage systems. This typically means double-jacketed hoses in sensitive areas, drip trays under the power unit, and automatic pump-shutdown triggered by a low-level fluid sensor. Environmentally acceptable fire-resistant fluids (HETG, HEPG) may also be specified for certain building types.