Rubber hydraulic hose and ... - Flipbook - Seite 331
Cleaning, inspection, testing and storage
Please for detailed recommendation follow ISO 8331:2016 Rubber and plastics hoses and hose assemblies — Guidelines for selection, storage,
use and maintenance and ISO 1402:2021 Rubber and plastics hoses and hose assemblies — Hydrostatic testing.
The below text is for general guidance, but we recomend to use the above standards in your operations.
Clean
Inspect
Proof test - hydrostatic
Proof test - pneumatic
Maintenance
Hose assemblies in operation
should be inspected frequently
for leakage, kinking, abrasion,
corrosion or any other signs
of wear or damage. Worn or
damaged hose assemblies should
be replaced immediately.
Inspect
Examine hose assembly
internally for cut or bulged tube,
obstructions, and cleanliness.
Proof test – hydrostatic
The hose assembly should be
hydrostatically tested at twice the
recommended working pressure
of the hose.
Proof test – pneumatic
Hose assemblies intended for gas
or air service should be tested
with air or nitrogen at 100 psi with
the assembly immersed in water.
Random bubbles may appear
over the hose and fitting area
when assembly is first pressurized.
This should not be construed as
a defect. However, if the bubbles
persist in forming at a steady rate
at any particular point on the
hose, the assembly should be
rejected.
Clean
At minimum a hose assembly
should be blown out with clean
compressed air.
Assemblies may be rinsed out
with mineral spirits if the tube
stock is compatible with oil,
otherwise hot water at +65°C
(+150°F) max. may be used.
Check for proper gap between
nut and socket or hex and socket.
Nuts should swivel freely. Cap
the ends of the hose with plastic
covers to keep clean.
Test pressure should be held for
not more than one minute and
not less than 30 seconds. When
test pressure is reached, visually
inspect hose assembly for: a) Any
leaks or signs of weakness. b) Any
movement of the hose fitting in
relation to the hose. Any of these
defects are cause for rejection.
Caution: Testing should be
conducted in approved test
stands with adequate guards to
protect the operator.
Storage and handling
Hose should be stored in a dark,
dry atmosphere away from
electrical equipment, and the
temperature should not exceed
+32°C (+90°F). Storage in the
original shipping container is
preferred.
EMEA Danfoss rubber hydraulic hose, fitting, tooling and accessories category catalog
331
Danfoss | Safety information
Maintenance
