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When it comes to finding the right hose, coupling, and assemblies for your application, there are 7 important questions and considerations that are essential to an effective hose system design or selection process - outlined by the acronym STAMPED. Even if you have your previous hose available for evaluation, you should think STAMPED every time you design or purchase a new hose system to ensure you’re getting the optimal solution for your specific application. As an easy-to-remember acronym, STAMPED helps ensure you get the right hose assembly for the job.
Size – What inside and outside hose diameter and length do you need to minimize pressure and avoid damage?
Internal diameter requirements will affect fluid velocity and outside diameter may also sometimes be a concern for routing purposes. When in doubt, match existing specifications.
Note that hose length changes range between +2% to +4% when hydraulic systems are pressurized during operation. Gates will custom cut and size hose systems to your exact specifications.
Temperature – What are the minimum/maximum temperatures the hose must withstand?
The maximum recommended hose temperature should never be exceeded, either in the fluid conveyed (material temperature, friction) or on the exterior (sunlight, working conditions) of the hose. Similarly, special hoses are available, which will maintain flexibility at very low temperatures. You can also order custom rubber compounds, insulation sleeves, or special hose constructions to ensure safe, productive operations – but remember to always follow the manufacturer guidelines.
Application – Where and how will the hose be used?
Environmental conditions such as ultraviolet light, salt water, air pollutants, temperature, ozone, chemicals, electricity, abrasion and paint application will all negatively impact the hose assembly life.
Hose material, pressure and temperature ratings, hose I.D. and O.D., and other essential hose construction variables should align with your application characteristics.
Material to be conveyed – What type of fluid is being conveyed?
Permeation, or effusion, is the movement of a substance through the hose tube walls, which may degrade the hose tube and cause cover blistering or other undesired effects. This must be considered, especially when conveying compressed gasses.
Be sure to select a hose which is compatible and approved by the manufacturer for the fluid conveyed. Concentration, pressure, temperature and other factors may impact the compatibility of the hose and fluid.
Pressure – What is the system pressure, including pressure spikes?
If a hose assembly will be exposed to suction, be sure it is rated to hold the maximum suction and pressure in that portion of the system. Pressure spikes greater than the hose working pressure will damage your hose system and cause premature system failure.
Ends or couplings – What type of threads does the system use?
Always use manufacturer-approved couplings for hose assemblies. Be sure to select the appropriate termination for a system working pressure and other requirements such as vibration resistance, mating thread, I.D./O.D, and pressure ratings to ensure a leak-free fit.
Delivery (volume and velocity) – How much fluid must go through the hose?
Identify the volume and velocity of fluid moving through the system. A fluid velocity that exceeds hose system specifications, especially for abrasive or harsh chemical fluids, can result in premature failure.
It is crucial not only that the assembly is made with components designed for each other and validated through a rigorous test regimen, but also that the assembly procedures and crimping are done correctly. We never recommend mixing and matching hydraulic components. If you need assistance selecting the right hydraulic hose system for your specific application, or need a custom solution, our product application engineers and experts are always happy to help.
