Hydraulic hose storage conditions
Over long periods, particularly when exposed to certain factors described herebelow, hoses can be modified in such a way as to no longer have their initial physical properties.
The right storage conditions can give maximum protection and reduce deterioration of the polymers.
Bulk hose :
Indicated life spans are valid only if hose is stored in the conditions described in the following paragraphs.
Elastomer hose :
- Up to 3 years old : can be used without restrictions
- Between 3 and 6 years : visual inspection, test samples at 2 times working pressure
- 6 to 8 years : full visual inspection, carry out destructive and impulse tests on samples
- Over 8 years : do not use
Thermoplastic hose :
- For polyurethane cover hoses (sae100r7 and R8, tecalemit hoses ttaf and ttkf) please refer to elastomer hose recommendations above.
- Tecalemit Flexibles® hoses tta and ttk, life span is twice as long in normal use. it can be longer in certain cases : please contact our technical department (bs iso 2230:2002)
Hose assemblies installed on equipment :
Hoses containing the usual liquid and installed on equipment unused for over 3 years should be tested at twice the working pressure and should be replaced if over 5 years.
In every case, a careful visual inspection should be made, particularly where hose bends and at connections between hose and swage ferrule.
All Tecalemit Flexibles® hoses carry a number used to identifiy date of manufacture and the date at which hose was placed in stock.
The ideal storage temperature is 15°C and the acceptable range is between 0°C and 35°C.
Hoses should therefore not be placed near a source of heat.
In any case, stored hoses should not be subjected to temperatures in excess of 50°C or lower than - 30°C.
Moreover, any important fluctuations of temperature during storage could lead to premature aging of the hose.
Any cracking of the outer cover due to ozone effects increase with temperature.
It is recommended to avoid humidity in excess of 65%.
Direct light is a major source of aging. items should not be subjected to sunlight or strong artificial light.
Should the storage area have windows, these should be covered with protective red, orange or white film, or use opaque packing on the items.
Ozone is a factor of aging that must be taken into account.
Storage areas should not contain any ozone generators such as mercury lamps or electrical equipment producing sparks such as AC electrical motors.
Moreover, circulation of air around and inside the hoses should be limited, for instance by leaving the original packing on the hose and plugging the hose ends.
Storage areas should be separated from workshops where the items could be subjected to projections of oil, solvants, detergents.
Storage bend radius
Ozone is major factor of aging which, in particular, causes cracking in the ruber outer cover.
When the hose is bent, the strain on the outer cover has a tendency to increase the cracks.
Consequently, the smaller the bend radius, more likely the risk of cracks appearing.
Ideally, hoses should be stored by laying them straight on a flat support with ends plugged.
Should hoses have to be stored in rolls, these should not be piled one on top of the other, and in no case should there be any permanent flattening of the sructure due to piling.
Hoses should not be hung on hooks and generally should not be subjected to any flexion or traction.