Beginner Hose Guide
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
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.