Metal Expansion Joint
 
 
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Definitions
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Maximum Working Pressure:
Maximum operating pressure to which the hose may operate through the stated bending range at this pressure.

Test Pressure:
To be specified in accordance with the application. Not to exceed 1 1/2 times maximum working pressure.

Burst Pressure:
The pressure at which the hose can be expected to fail, based on the corrugated hose and or the
braid at 70° F.

Pulsating Or Shock Pressures:
When pulsating pressures exist use 1/2 of rated pressure. When shock pressures exist use 1/6 of rated pressure.

Flow Velocity:
Excessive flow velocities can cause fatigue failure in metal hose. The flow should not exceed 100ft./sec
gas 50ft/sec liquid in braided hose. A liner must be used for higher flow rates. If a hose is installed in
a bent condition the flow must be reduced by 25% for a 45° bend, 50% for a 90° bend and so forth.

Pressure Drop:
The Pressure drop through a straight metal hose is, as a rule of thumb, about three times as much as for black pipe. Consult factory for more accurate calculations, and when hoses are installed in bent conditions.

Dynamic Bend Radius:
The bend radius used in calculations involving applications where the hose is moving. This bend radius has a direct relation to cycle life. Bending the hose in a smaller radius than rated will adversely affect the life of the hose.

Static Bend Radius:
The bend radius to which a hose may be bent when no further motion is to be imposed.

Live Length:
The length of hose which will bend or the hose between the braid collars. 

Temperature

For operating temperatures exceeding 70° F the pressures must be decreased in accordance with the
following table. For long time exposure over 1000° F consult the factory.

Conversion Factors
Apply to pressure rating for elevated temperature.

TEMPERATURE F°
STAINLESS STEEL
70
1.00
150
.97
200
.94
250
.92
300
.88
350
.86
400
.83
450
.81
500
.78
600
.74
700
.70
800
.66
900
.62
1000
.60
1100
.58
1200
.55
1300
.50
1400
.44
1500
.40



 

Motion
Axial Motion:
Motion that occurs when a hose is compressed along its longitudinal axis. Axial motion is only applicable in very short lengths of annular hose only. Helical hose and braided hose should not be subjected to axial motion.
Offset Motion:
Motion that occurs when one end of the hose is deflected in a plane perpendicular to its longitudinal axis with the ends remaining parallel. In offset motion applications the offset should never exceed 25% of the center line bend radius. 
 
L = Hose Live Length (inches)
T = Total Travel (inches)
R =  Bend Radius (inches)
K = Loop Length (inches)
Angular Motion:
Motion that occurs when one end of a hose is moved in a simple bend when the ends do not remain parallel.
 
L = Live Length (inches)
R =  Bend Radius (inches)
 = Angle of Bend (degrees)
 = 3.1416 (inches
Random Motion:
Motion that occurs in random planes such as a loading or unloading hose, or a fire hose.

The hose length is dependent on the confines of areas and distance to be covered.
Radial Motion:
Motion that occurs when a hose is bent in a circular arc.
                     

 

 

   




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