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Technical guideIdentify the hose for your reel
R7, R8, B1, B2, T2… To replace a hose, note its marking and the reel’s part number. The same internal diameter guarantees neither the same permissible pressure nor the same winding behaviour.
Read the construction code
Already identified your hose assembly? Go directly to: TU1 — single hose · TU2 — twin hose · TU3 / TU4 — three or four lines. Otherwise, start with the code marked on the hose.
On mobile, scroll the table horizontally.
| Code | Construction listed in the catalogue | What to check |
|---|---|---|
| R7 / R8 | Thermoplastic with textile reinforcement | Compare pressure, diameter and bend radius in the table for the relevant configuration. |
| B1 | Thermoplastic with one steel braid | Identify the diameter and hose assembly type. |
| B2 | Rubber with two steel braids | Do not classify it with B1 and B3 thermoplastic hoses. |
| T2 | Thermoplastic with two steel braids | Check pressure and bend radius for the selected diameter. |
| B3 / Z3 / HDH | Thermoplastic with steel/fibre reinforcement according to the TU2 catalogue | Check the complete designation; the codes are not interchangeable. |
| R18 / CPLT5000 | Thermoplastic for low temperatures | Compare the temperature range and pressure in the catalogue row. |
| 1SN / 2SN / 2SC / I21 / I40 / 4SP / 4SH / 462 | Rubber constructions in the TU1 table | Check the reinforcement, operating conditions and any approvals specific to the part number. |
Reference information from the TU1 and TU2 tables in the DEMAC general catalogue, printed pages 75 and 76. Read the specifications in the complete row for the relevant diameter and hose assembly.
Four checks for a replacement
Marking and dimensions
Photograph the hose code. Note internal diameter, external diameter, length and fitting type; do not choose a fitting based on internal diameter alone.
Pressure and fluid
State the fluid and operating pressure. The permissible limit depends on the complete reel, hose and fittings and on the operating conditions.
Bending and guidance
Check the hose’s minimum bend radius against the drum and pulleys. A higher permissible pressure does not mean that the hose suits the same reel.
Temperature and environment
Specify ambient and fluid temperatures, exposure and special requirements. Check these values for the selected construction and diameter.
Single, twin, multiple lines or integrated cable
- TU1: single hose.
- TU2: twin hoses.
- TU3 and TU4: three or four lines.
- Assemblies combining hoses and electrical cable.
Four lines does not specify one particular hose assembly. Depending on the reel family, this may mean two twin-hose assemblies or separate hoses. When replacing the hose assembly, retain the layout specified for the part number.
Same diameter, different specifications
In the table for TU2, 1/4-inch twin hoses, the catalogue states 210 bar for R7 and 350 bar for R8. These values apply to the specific table rows, not to all diameters or configurations.
Before substitution, also check external dimensions, bend radius, windable length and connections. Having the complete assembly validated avoids selecting a hose based solely on its pressure rating.
Compare two hoses using the complete catalogue row
The TU1 to TU4 tables provide more than pressure ratings. They also help verify that the proposed hose suits the existing drum, guidance and hose assembly.
On mobile, scroll the table horizontally.
| Specification to compare | What is the comparison for? | Information to provide |
|---|---|---|
| Nominal diameter and external diameter | The internal bore does not describe the space occupied by the hose on the drum or in the guides. | Both diameters, the construction code and the hose assembly layout. |
| Bend radius | Check that the hose suits the drum, pulleys and routing. | The reel’s part number and views of the hose routing. |
| Linear mass, in kg/m | Identify any difference in hose assembly weight, especially where part of it is suspended. | Length and operating position; have retraction confirmed for the selected complete assembly. |
| Pressure and temperature | Check the permissible conditions for the specific construction and diameter. | Fluid, operating pressure, ambient and fluid temperatures. |
| Connections | Check the interface with the rotary union and the equipment being supplied. | Photographs of the ends and, if known, fitting types and dimensions. |
Access tables by hose assembly: TU1 single hose · TU2 twin hose · TU3 / TU4 three or four lines.
Hoses and cable: also photograph their layout
The catalogue distinguishes assemblies with a central cable, a side cable and a central version with the cable inserted in a tube. Simply stating “two hoses and one cable” is therefore not sufficient to order the correct replacement.
Photograph the assembly from the front and side without dismantling it. State the number of hoses, their construction, cable markings, conductor count and cross-section, if known. Check the layout for the exact part number; it cannot be inferred from the number of lines alone.
View hose and cable assemblies. The catalogue drawings describe the versions: they are not a method for converting an assembly.
Frequently asked questions about hose replacement
Are R7 and R8 interchangeable?
Not based on the code or diameter alone. The example above compares their pressure for TU2 1/4-inch hoses; external diameter, bend radius, fittings and windable length must also be checked for the equipment concerned.
Can a twin hose be replaced by two single hoses?
This substitution must not be assumed equivalent. The hose assembly layout and guidance are part of the reel’s configuration. Provide the part number and photographs before choosing a different arrangement.
Should I order the usable length or the total length?
These are different specifications in reel tables. Provide the part number, required travel and known length, stating what it measures, rather than inferring hose length from the machine’s travel alone.
The marking has worn off: can the hose assembly still be identified?
Start with the reel’s serial number, then provide views of the hose assembly and connections. Add the available information about the machine and the required duty; construction will not be determined from colour alone.
Need to replace a hose or hose assembly?
Send the reel’s part number, a photograph of the hose marking and fittings, and the known length and specifications. For an assembly, specify its layout: single hose, twin hose, multiple lines or integrated cable. We will clarify any additional checks with you.
Compatibility must be confirmed for the selected configuration before ordering.