S.T.A.M.P.E.D

STAMPED is an acronym corresponding to the 7 major areas of information required to provide a correct hose assembly:

Note: Each area of information may require further clarification or additional details
The information provided below is a condensed  version of the Hose Safety Handbook published by NAHAD

S stands for SIZE; I.D, length and any O.D constraints

• overall length should be specified to include fittings
• tolerances need to be specified if special requirements exist

Note: Under-sizing hose assemblies results in higher flow rates of the medium. The ensuing turbulence causes loss of pressure, noise and increased temperatures. This can be detrimental to the entire system.

T stands for TEMPERATURE of the material conveyed and environmental conditions

• Temperature affects service life
• Temperature resistance depends on medium
• Continuous (average) and minimum / maximum temperatures have to be specified
• Note if flame resistance or flammability will be an issue
• Protect assemblies with heat shields near hot surfaces
• Specify potential fluctuation in temperatures
• Do not use hose assemblies for any medium over specified temperature range
• Maximum assembly working pressures will decrease as temperatures increase

Note: Continuous operation at high temperatures can affect the service life of the hose and reliable seating of the fittings. Hose assemblies will have a longer service life if not continually used at the limits of their working pressure, bend radius and temperature range.

A stands for APPLICATION, outlines service conditions

• Configuration, routing or installation (add sketch if applicable)
• Quantify anticipated movement
• Intermittent or continuous service
• Indoor or outdoor use (chemicals in environment)
• Excessive abrasion
• Electrical conductivity requirements
• Flexing: Intermittent, continuous or static

M stands for the MATERIAL or MEDIA being conveyed, type and concentration

• Chemical name and concentration (MSDS information)
• Any special specifications or agency requirements (e.g. USCG, FDA)
• Exposure time: Is media flowing or sitting in the hose for long periods
• Will the hose be submerged or exposed to chemicals externally

P stands for PRESSURE to which the assembly is exposed (positive and negative)

• Assembly working pressure must be equal to or greater than system pressure
• Pressure spikes greater than hose maximum working pressure will shorten hose life
• Temperature and vacuum implications
• Do not use beyond manufacturer’s stated working pressure

E stands for ENDS; style, type, orientation and attachment methods

• Uncoupled or coupled hose; hose with built-in fittings
• Specify end type
• Materials and dimensions (carbon steel, brass, stainless steel)
• Conductivity requirements

D stands for Delivery

• Specify customer requirements
• Testing / tagging requirements (certification: USCG, CRN, CGA)
• Packing and shipment requirements

Custom Assemblies:

There are specific applications that require additional design, fabrication, installation and maintenance considerations over and above the requirements set forth here. Contact your supplier to discuss your specific requirements.

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