Quite often, customers have questions when the subject of hose flexibility is brought up. Many different terms are used to describe this attribute of the Saint-Gobain Performance Plastics Sanitary Couplers line. See below for some of the formal definitions currently used in the hose industry.
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Bend Radius (fluoropolymer hose and all rubber hose) The radius of a bent section of hose measured to the innermost surface of the curved portion (R1).
Bend Radius (metal hose) The radius of a bent section of hose measured to the hose centerline (R2).
Minimum Bend Radius The smallest radius at which a hose can be used.
Bend Radius (all, except metal hose) = R1 measured to inside radius
Bend Radius for metal hose = R2 measured to centerline radius
For Metal Hose
Dynamic Bend Radius The radius at which constant or continuous flexing occurs.
Static Bend Radius The smallest fixed radius to which a hose can be subjected.
Force to Bend The amount of stress required to induce bending around a specified radius. Hence, a measure of stiffness.
Maximum Rated Working Pressure The maximum pressure that the hose can be subjected to on a continuous basis.
Maximum Rated Test Pressure The maximum rated pressure is multiplied by 150% to determine the maximum rated test pressure.
Nominal Rated Burst Pressure The average pressure at which the core or braid will rupture at ambient temperature.
Pulsating or Shock Pressure The performance of metal hose can be greatly reduced under this type of working pressure. Pressures are normally reduced by 50% in pulsating or shock pressure applications.
Pressure/Temperature Correction Metal hose pressure capabilities decrease as the temperature increases. Consult the Temperature/Pressure Reference guide (p. 42) to determine pressure ratings at elevated temperatures.
Pressure Drop Pressure drop occurs in long hose runs. The amount of pressure loss in a metal hose is approximately three times that of steel pipe.