Overview
ISO 1402:2021 specifies standardized methods for hydrostatic testing of rubber and plastics hoses and hose assemblies, including procedures to determine dimensional stability under pressure. The fifth edition (2021) updates pressure tolerances and failure-mode descriptions and is the reference for proof, burst and leakage testing using a liquid test medium. The standard applies general test conditions (standard temperature per ISO 23529) and safety measures for pressurized-liquid testing.
Key Topics and Requirements
- Scope: Hydrostatic test methods for rubber and plastics hoses and hose assemblies; dimensional stability measurements.
- Apparatus: Pressure source able to reach test pressures, calibrated pressure gauge or pressure transducer (select full-scale range so test pressure is 15–85% of scale), and dimensional tools (calipers, tape measures, circumferential/π tape).
- Test pieces: Minimum free lengths for hose test pieces (600 mm if deformation measured, 300 mm if not); use manufactured assembly length for hose assemblies; at least two test pieces.
- Application of pressure: Fill with liquid, expel all air, apply pressure at a uniform rate. Time to reach final pressure depends on nominal inside diameter:
- ≤ 50 mm: 30–60 s
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50 mm and ≤250 mm: 60–240 s
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250 mm or longer test lengths: agreed between manufacturer and user
- Proof pressure hold test: Apply specified proof pressure (related to maximum working pressure per ISO 7751), hold 30–60 s while inspecting for leakage, cracking or abrupt distortion. Pressure tolerance is +10%.
- Dimensional stability and deformation: Procedures for measuring change in length, change in external diameter/circumference (use π tape or calipers), twisting and warping under specified test pressure. Reference marks and measurement accuracy requirements are specified.
- Burst and leakage tests: Defined procedures and failure criteria for burst pressure and leakage checks.
- Safety: Tests must be conducted in suitable enclosures; avoid gases as test medium; ensure all air is expelled to prevent hazardous failures.
Applications and Who Uses It
ISO 1402:2021 is used by:
- Hose and hose-assembly manufacturers for type and routine testing and product specification compliance.
- Quality assurance and test laboratories performing proof, burst and leakage testing.
- Design engineers verifying dimensional stability and performance under pressure.
- Procurement, regulatory and inspection bodies specifying acceptance testing and supplier qualification.
Practical benefits include consistent, repeatable hydrostatic test methods, clearer acceptance criteria, and reduced safety risk when testing hoses and assemblies.
Related Standards
- ISO 7751 - Ratios of proof and burst pressure to maximum working pressure
- ISO 8330 - Vocabulary for rubber and plastics hoses and hose assemblies
- ISO 23529 - Conditioning and preparation of test pieces
Keywords: ISO 1402:2021, hydrostatic testing, rubber hoses, plastics hoses, hose assemblies, proof pressure, burst pressure, dimensional stability, leakage test.
