If the governing standard for hose assembly is unknown, further application detail must be identified. An effective way to identify application factors that need reviewing prior to defining the proper specifications of a hose assembly is to remember the simple acronym STAMPED
The guide uses the STAMPED process. STAMPED is an acronym and stands for the 7 major information areas required to provide a quality hose assembly for your customer, as follows:
Size – I.D., O.D. and overall length of the assembly.
To determine the replacement hose I.D., read the layline printing on the side of the original hose. If the original hose layline is painted over or worn off, the original hose must be cut and inside diameter measured for size.
The inside diameter of the hose must be adequate to keep pressure loss to a minimum and avoid damage to the hose due to heat generation or excessive turbulence. The hose should be sized according to the nomographic chart in appendix C
Temperature of the fluid conveyed and environmental conditions
When selecting a replacement assembly, two areas of temperature must be considered. These are fluid temperature and ambient temperature. The hose selected must be capable of withstanding the minimum and maximum temperature seen by the system. Care must be taken when routing near hot manifolds and in extreme cases a heat shield may be advisable.
Application – The conditions under which the hose assembly will be used
Determine where or how the replacement hose or assembly is to be used. Most often, only a duplicate of the original hose will have to be made. To fulfill the requirements of the application, additional questions may need to be answered, such as:
– Where will the hose be used?
– Excessive abrasion?
– Electrical conductivity requirements?
– Minimum bend radius?
– Unusual mechanical loads?
– Routing requirements?
– Suction required?
– Equipment type?
– Hose construction?
Material – Fluid being conveyed, type and concentration
Some aaplications require specialized oils or chemicals to be conveyed through the system. Hose selection must assure compatibility of the hose tube. For detailed fluid compatibility data, consult your house and coupling manufacturer.
Pressure – Pressure to which the assembly will be exposed
The most important step in the hose selection process is knowing system pressure, including pressure spikes. Hose assembly working pressures must be equal to or greater than the published working pressure will shorten hose life and must be taken into consideration.
Ends– Termination end style, type, orientation, attachment methods, etc.
Identify end connections using information in Appendix E
Delivery – Testing, quality, cleanliness, packaging, and delivery requirements.
Define any special requirements needed.