Technical Data for Flexible Metal Hose

The selection of flexible metal hose for a particular application is influenced by six primary considerations:• 

Temperature
•  Pressure
•  Media
•  Size
•  End Fittings
•  MotionTo make the best choice for a specific application, consider all the relevant operating factors against the properties of the various types of flexible metal hoses.

Temperature

The physical properties of any material vary with temperature. Working pressure, the type of media being conveyed and the nature of the application are what affect the limits for operating temperature. Flexible metal hose can be used for a wide range of temperatures given that the material is selected carefully. The temperature limit depends upon the hose type, metal alloy, end fittings and the method
of fitting attachment choices.

Temperature Correction Table

Temp
(°F)
304,
316L Stainless
321
Stainless
Bronze
Monel
Hastelloy
Inconel
Room 1.00 1.00 1.00 1.00 1.00 1.00
150 .95 .97 .92 .93 .97 .99
200 .91 .94 .89 .90 .94 .98
250 .88 .92 .86 .87 .92 .97
300 .85 .88 .83 .83 .91 .97
350 .81 .86 .81 .82 .89 .96
400 .78 .83 .78 .79 .87 .95
450 .77 .81 .75 .77 .86 .94
500 .77 .78 - .73 .85 .94
600 .76 .74 - .72 .84 .92
700 .74 .70 - .71 .82 .90
800 .73 .66 - .70 .81 .89
900 .68 .62 - - .79 .87
1000 .60 .90 - - .78 .86
1100 .58 .58 - - .75 .84
1200 .53 .55 - - .73 .82
1300 .44 .50 - - .69 .79
1400 .35 .44 - - .65 .77
1500 .26 .40 - - - .74

Pressure

The nominal pressure ratings of flexible metal hose vary according to type, material and size. Pressure is affected by many other factors such as temperature, pulsating conditions and bending stresses, under actual working conditions.

Media

The type of media being conveyed through the hose is important to consider during the selection process. Metal hose can be corroded by the material flowing through it and the outside environment. A metal hose can be selected that is resistant to the proposed media for almost all applications. Since metal hose has a thin wall, it will not have the same total life as a heavier walled tube
or pipe.

Size

The size of flexible metal hose is specified by the nominal diameter. When choosing a metal hose for a particular application, the existing piping will normally dictate the size needed. Flow rate, velocity and pressure drop considerations may also influence the selection of the hose size.

End Fittings

There is an extensive range of end fittings available for flexible metal hose. These end fittings include male and female pipe threads, unions, flanges, flared tube fittings or other specially designed connectors. End fittings are attached by welding, silver brazing, soldering or other by other mechanical means, depending on the type of hose.

Motion

Flexible metal hose is used in four types of applications:

•  To correct misalignment
•  To provide flexibility in manual handling operations
•  To compensate for regular or constant movement
•  To absorb vibrationIn all types, careful hose selection, design of the assembly and installation are important for optimal service life. Mechanical design and the flexibility of its material determine the flexibility of a hose.

Flextrol Corporation
192 Browns Hill Road Locust, NC 28097
Toll Free: 800-424-0212 | Tel: 704-888-1120 | Fax: 704-888-1123