Short answer
The layline is the identification and property marking on the outer surface of the hose. It may include manufacturer, series, nominal size, pressure or standard information; the content varies by product family. A photo of the marking is useful, but on its own it does not show the assembly's connections, past use or remaining life.
Technical explanation
Outer surface markings are the starting point for reaching the correct product documentation. If the text is partially erased, missing characters should not be guessed and turned into a definitive product code. If a pressure value is legible, its unit and the product it belongs to must also be read. A serial label added to a hose assembly is a different traceability layer from the hose manufacturer's marking; having both together is possible and useful.
Topic-specific checkpoints
| Item | Description |
|---|---|
| Identification marking | Brand and series; exact record of the legible characters. |
| Technical marking | Full context of the size, unit, standard and pressure statement. |
| Production information | Date or batch code, if present; the manufacturer's coding explanation. |
| Assembly label | Separate link to the assembly serial number and production record. |
How is it assessed in practice?
The recommended recording method is to keep a photo long enough to show several repetitions of the marking together with a text transcription. The illegible part is clearly marked in the text. It is noted whether a field was taken from the marking on the hose, the assembly label or the invoice. For example, the assembly's serial number is not copied into the batch number field of the bulk hose. This reduces the risk of identifying a product by the wrong number when searching for technical documentation later.
Original editorial recommendation; not a clause of a standard.
Frequently asked questions
Can the pressure of a hose with illegible markings be found from its outside diameter?
No. The outside diameter does not reliably determine the product family or pressure class. Do not record an uncertain identity as verified technical data.
Source coverage
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S021
Selecting a hose assembly? Remember STAMPED Swagelok Bangalore · accessed 2026-10-19 Size; Temperature; Application; Material; Pressure; End Connections; Delivery
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S036
Industrial Hose Safety Connections Gates · accessed 2026-10-19 PDF pp. 6–8 construction and selection; pp. 10–19 maintenance; pp. 21–27 special services