ISO 10771-1:2015

Overview

ISO 10771-1:2015 - Hydraulic fluid power - Fatigue pressure testing of metal pressure-containing envelopes - Part 1: Test method - specifies a general, repeatable fatigue pressure test method for metal components in hydraulic fluid power systems. It defines how to apply sustained, steady cyclic internal pressure loads to the parts of a component that actually contain pressurized fluid (the pressure-containing envelope). The standard is limited to metallic envelopes operating in temperature ranges that exclude creep and low-temperature embrittlement, and to components not weakened by corrosion or chemical action. Piping is excluded.

Key technical topics and requirements

• Scope & exclusions: Applies to metal pressure-containing envelopes only; excludes piping per ISO 4413. Non-metallic gaskets/seals may be present but are not considered part of the envelope under test.
• Test waveform and cycling: A cyclic pressure waveform is required; the shape is not prescriptive but must achieve specified upper and lower pressure levels and timing clauses (see clause 7.1). Test frequency guidance: f ≤ 3 Hz (time period T ≥ 100 ms) unless validated experience supports higher frequencies.
• Test pressure: Determined by the user; rating methods are referenced in ISO/TR 10771‑2.
• Test preparation:
  • Remove entrapped air prior to testing.
  • Maintain hydraulic fluid temperature between 15 °C and 80 °C; component minimum 15 °C.
  • Use a non-corrosive hydraulic fluid with kinematic viscosity ≤ 60 mm²/s at test temperature.
  • Pressure transducers should be mounted directly in or as near as possible to the component to record internal conditions.
• Instrumentation accuracy:
  • Pressure: ±1.0% of the upper cyclic test pressure
  • Strain: ±1% of value at upper cyclic pressure
  • Time resolution and temperature tolerances are specified
  • Frequency response requirements for measurement systems (0–2 kHz amplitude ratio)
• Failure criteria: External or internal leakage caused by fatigue, or material separation/cracks.
• Annexes: Normative annexes A–D provide specific requirements for pumps & motors, cylinders, gas‑loaded accumulators and valves.

Practical applications & users

• Who uses it: hydraulic component manufacturers, test laboratories, product designers, reliability engineers and conformity assessors.
• Why use it:
  • Verify fatigue resistance of pressure-retaining parts
  • Provide comparable test data for component selection in system design
  • Support safety and reliability assessments of hydraulic components
• Typical use cases:
  • Design validation of hydraulic cylinders, pumps, valves and accumulators
  • Quality assurance testing and product development
  • Supplier verification testing and certification preparation

Related standards

• ISO 4413 - general rules and safety for hydraulic systems (piping exclusion)
• ISO/TR 10771‑2 - rating methods (informative technical report)
• ISO 9110‑1 / ISO 9110‑2 - measurement techniques for pressure testing
• ISO 5598 - fluid power vocabulary
• ISO 6803, ISO 6605 - fatigue testing methods for piping devices

Keywords: ISO 10771-1:2015, fatigue pressure testing, hydraulic fluid power, metal pressure-containing envelopes, cyclic pressure test, test procedure, failure criteria, pumps, cylinders, valves, accumulators.