Lenhardt & Wagner LW 150 ES, Operating Instructions Manual

Page: 183 / 187

SERVICE LIFE
Information on the service life of
L&W high pressure hoses
Version: 2020-06-01
Page - 7
Service life of L&W high pressure hoses
When determining the service life or the replacement interval of the individual hose lines, the
concrete specifications and recommendations of the hose line or machine manufacturer
must be observed. Furthermore, empirical values resulting from previous tests done under the
prevailing operating conditions on site are also relevant.
Guideline values for recommended replacement intervals of hose lines which have proven
themselves in practice are summarized below.
Hose line requirements Recommended replacement intervals
Standard requirements 6 years
(Service life including a maximum of 2 years storage
time)
Increased requirements, e.g. due to
- increased operating time,
e.g. multi-shift operation, or short machine
or pressure pulse cycle times
- strong external and internal influences (due
to the medium), which greatly reduce the
service life of the hose line 2 years (service life)
The guideline given above for a replacement interval of six years for hose lines meeting normal
requirements includes a maximum storage period of two years. The guideline value of two years
for hose lines meeting increased requirements represents the maximum permissible service life.
A prolongation of the guideline values given above for replacement intervals is possible if

appropriate test values and empirical values are available from the operator of the
machine which permit safe continued use beyond the recommended maximum service
period,


a hazard or risk assessment, documented in writing, has been carried out by the operator, which
also takes into account protective measures in the event of failure of hose lines, and


tests for safe working conditions are carried out by qualified persons at appropriately
set, if necessary reduced, intervals.

It must be ensured that the prolongation of the replacement intervals does not result in a
dangerous situation that could injure employees or other persons.
If hose lines fail during operation or if damage or defects are frequently detected during the
recurring tests, then, in addition to investigating the causes, the test and replacement intervals must
be shortened.