Short answer
In an equivalence assessment, the requirements to be met are fixed first, and then it is shown with which document the candidate product meets them. The same diameter, a similar appearance or the same standard family does not on its own prove that the hose assembly is equivalent.
Source: S017
Technical explanation
Hose, fitting and assembly data are verified as a system. A candidate hose's working pressure appearing suitable does not mean it can be used with the existing fitting at the same crimp dimension. Bend radius, outside diameter, cover properties, temperature and fluid constraints may also differ. In particular, carrying previous assembly data over to a new product code is a separate technical decision; a commercial equivalence definition does not make this decision automatically.
Source: S017
Topic-specific checkpoints
| Item | Description |
|---|---|
| Requirement to preserve | Which of the service, geometry and documents are mandatory? |
| Candidate evidence | Manufacturer documentation for the relevant size and product revision. |
| Assembly impact | Have the fitting, ferrule, tooling and crimp data been re-verified? |
| Change record | Approving authority, scope, date and new product identity. |
Source: S017
How is it assessed in practice?
In an equivalence file, create requirement-and-evidence pairs instead of general adjectives such as 'the same' or 'better'. For example, a smaller outside diameter may help in a narrow pass-through while changing compatibility with the existing clamp or crimp ferrule. Write down separately the effect of the change on the machine layout, the stock part code and the maintenance instructions. An accepted equivalent should be tracked with a new revision; the old product's records should not be retroactively changed to the new product name.
Original editorial recommendation; not a clause of a standard.
Frequently asked questions
Can the old fitting be used with the equivalent hose?
Only if there is valid verification for that combination. The same nominal size or production experience does not replace assembly data for the new combination.
Source: S017
Source coverage
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S017
Parker Safety Guide, Publication 4400-B.1 Parker Hannifin · accessed 2026-10-20 PDF page 3; 3.1 Component Inspection, 3.2 Hose and Fitting Assembly and 3.3 Related AccessoriesPDF page 3; 3.7 Minimum Bend Radius, 3.8 Twist Angle and Orientation and 3.13 Routing | PDF page 2; 2.4 Temperature | PDF page 3; 2.17 Radiant Heat | PDF page 2; 2.5 Fluid Compatibility | PDF page 2; 2.7 Size