Page 5 - CorrugatedCatalog110913Rev8LR

When selecting a hose, you must consider three variables: pressure-carrying capability, fexibility,
and chemical compatibility.
1. Pressure-Carrying Capability
The hose must be strong enough to handle the pressures to which it will be
exposed. To determine hose pressure capability, consult the catalog for the
“Maximum Working Pressure” stated for the hose. The Maximum Working
Pressure must be reduced for each of the following circumstances:
• Temperature - As temperature increases, hose working pressure
decreases. After you have determined the proper alloy (see “Chemical
Compatibility” below) go to the “Derating Factor” table on page
33 in Technical Information and match the alloy of the hose and braid
with the highest temperature to which they will be exposed (either
internally or externally) to obtain the proper derating factors. Then
multiply the hose’s Maximum Working Pressure by the most-limiting
temperature derating factor.
• Dynamic Pressure - Pulsating, surge, or shock pressures, like those
encountered with quick opening or closing valves, can infict severe
damage on a hose. If your application entails pulsating pressures, the
working pressure should be derated by half. If your application entails
shock pressures, derate the stated working pressure to 1/6 of its
value.
2. Flexibility
Confrm that the hose’s minimum bend radius is less than the bend radius required
for the application. Increasing the installed radius of the hose will reduce fatigue
on the corrugations, increasing assembly life. Care should also be taken for
applications with vibration. Contact Hose Master’s Inside Sales Department if
excessive vibration is present. Refer to the Vibration chart on page 35 for
additional information.
3. Chemical Compatibility
You must choose a material for the hose and braid that is compatible with the
media being conveyed through the hose, as well as the environment in which the
hose is to be installed. When determining chemical compatibility, it is important to
know the temperature and concentration of the chemical(s). Although there are
many resources to confrm chemical compatibility, two of the industry standards
that you may use are the National Association of Corrosion Engineers (NACE) and
the Compass Corrosion Guides. You may also contact Hose Master’s Inside
Sales Department, which can check these sources for you.
Example:
1” Annufex hose - T321 stainless steel hose and T304 stainless steel
braid @ 500° F with shock pressures.
Catalog Maximum Working Pressure = 718 psi
Temperature Derating Factor at 500° F. = 0.88; and the
Pressure Derating Factor = 1/6
Maximum Application Working Pressure =
718 psi x 0.88 x 1/6 = 105.31 psi
SELECTING A HOSE
800 - 221 - 2319 • www. hosemas t e r. com
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