Technical information
Hose has a limited life and the users must alert to sign of impending failure, parti-
cularly when the conditions of service include high working pressures and/or the
conveyance or containment of hazardous materials.
General Care and Maintenance of Hose:
Hose should not be subjected to any form of abuse in service. It should be handled
with reasonable care. Hose should not be dragged over sharp or abrasive surfaces
unless specifically designed for such service. Care should be taken to protect hose
from severe end loads for wich the hose or hose assembly were not designed.
Hose should be used at or below its rated working pressure, any changes in pres-
sure should be made gradually so as to not subject the hose to excessive surge
pressures. Hose should not be kinked or be run over by equipment. In handling
large size hose, dollies should be used whenever possible; slings or handling rigs,
properly placed, should be used to support heavy hose for such installations as
oil suction and discharge service.
Rubber hose products in storage can be affected adversely by temperature, humi-
dity, ozone, sunlight, oils, solvents, corrosive liquids and fumes, insects, rodents
and radioactive materials.
The appropriate method for storing hose depends to a great extent on its size
(diameter and length), the quantity to be stored, and the way in wich it is pa-
ckaged. Hose should not be piled or stacked to such an extent that any distortion
is obtained due to weight of the top coils or lengths. Since hose products vary
considerably in size, weight, and length, it is not practical to establish definite
recommendations on this point.
The ideal temperature for the storage of rubber products ranges from 10-
21°C (50-70°F) with a maximum limit of 38°C (100°F). If stored below 0°C
(32°F) some rubber products become stiff and would require warming before
being placed in service. Rubber products should not be stored near sources
of heat, such as radiator, base heaters, etc., nor should they be stored under
conditions of high or low humidity. To avoid the adverse effects of high ozone
concentration, rubber hose product should not be stored near electrical equip-
ment that may generate ozone or be stored for any lengthy period in geogra-
phical area of known high ozone concentration. Exposure to direct or reflected
sunlight – even through windows – should not be stored under flourescent or
mercury lamps which generate light waves harmful to rubber.
General test and inspection procedures for hose
At regular specified intervals an inspection and test should take place to determine
whether the hose is suitable for continuing in service. Generally visual inspection of
the hose and couplings or fittings should be made for loose covers, kinks, bulges
or soft spots which might indicate broken or displaced reinforcement; evidences
of coupling failure. The hose may be subjected to a hydrostatic test pressure if this
available and the test pressure of the hose which has been in service should be at
1.5x of the working pressure of the hose unless otherwise specified.
To avoid the contamination of product, after test the hose may be flushed with
denatured alcohol to remove traces of moisture; hose should be subjected to
hydrostatic test while straight, not in kinked or curved position.
Technical information
Care, maintenance, storage
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