Rubber Hose Pressure Test: Methods, Standards & Procedures
Proof, burst, impulse and hydrostatic testing for rubber hose — why it matters, the governing standards, pressure ratios, the step-by-step procedure and pass/fail criteria.
A rubber hose that fails under pressure can burst violently, injure operators and shut down a production line. Pressure testing is the only reliable way to verify that a hose assembly performs safely at its rated working pressure before service.
Pressure testing serves three purposes:
- Quality verification — confirms the hose meets its stated working pressure
- Safety assurance — establishes a verified margin between working pressure and failure point
- Standards compliance — demonstrates conformance to ISO, SAE or customer-specified requirements
The four test methods
Four primary methods are used in industrial rubber hose evaluation — proof, burst, impulse and hydrostatic — each applied at a different stage of product qualification or quality control (WP = working pressure).
Applicable international standards
The most commonly referenced standards in hose procurement and manufacturing are ISO 1402, SAE J343 and ISO 7751.
Buyer note: ISO 1402 is the most widely accepted globally. For North American OEM buyers, SAE J343 compliance is typically required alongside ISO certification.
Pressure ratios explained
The relationship between working, proof and burst pressure (defined by ISO 7751) forms the basis of all hose safety margins.
Example: a hose with a 100 bar working pressure must pass a proof test at 200 bar without leaking or deforming, and must not burst below 400 bar in a destructive test. Any hose bursting below 400 bar has failed.
Step-by-step procedure
The procedure applies to both proof- and burst-pressure hydrostatic testing, per ISO 1402 and SAE J343. All tests must use liquid (water or hydraulic oil) — never compressed air or gas — inside a suitable protective enclosure, with all air expelled before pressurizing.
Pass / fail criteria
Pass: no leakage during the proof hold; no bulging, blistering or deformation; no coupling ejection; burst pressure ≥ specified minimum (≥4× WP); failure occurs in the hose body, not the fitting crimp.
Fail: any leakage during proof hold; visible bulging, cracking or cover damage; coupling ejection or fitting separation; burst pressure below the specified minimum.