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A) All applications should be checked to ensure that the proper hose assembly lengths are being installed:
* Hose assemblies should not be installed in a "stretched" (taut) fashion. Some expansion and contraction of the hose assembly can occur due to temperature variation, system pressures, and system cycling (see Figure #1).
* All hose assemblies should be routed properly to avoid contact with other surfaces that could possibly cause "chafing" (abrasion of the wire braided reinforcement).
* The use of elbows and adapters should be considered to relieve hose "strain" (see Figure #2).
Do not use any plastic fittings or adapters.
*Hose assemblies should not be "bent" past the minimum bend radius requirements listed in the chart below. Hose assemblies showing evidence of "kinking" (being bent beyond the recommended bend radius) should not be installed (see Figure #3).
|
Hose Size |
Working
Pressure |
Min. Burst
(@ 72°F) |
Temperature
Range |
Minimum
Bend Radius |
|
1/2" |
400 PSI |
1600 PSI |
-40° to 200°F |
2.5" |
|
3/4" |
300 PSI |
1200 PSI |
-40° to 200°F |
4" |
|
1" |
500 PSI |
2000 PSI |
-40° to 200°F |
5.5" |
|
1-1/4" |
400 PSI |
1600 PSI |
-40° to 200°F |
10" |
B) All hose assemblies should be installed in the following fashion so that no "twisting" occurs:
* Solid male pipe thread (NPT) ends should be installed first unless they are being connected to a "swivel" female (NPT).
The entire hose assembly must rotate during the tightening of this connection in order to avoid hose tube damage.
* The flared adapter on the "union" (female swivel) end should be removed with the male pipe (NPT) end of the adapter connected to the appropriate port first.
CAUTION: Thread sealant or thread tape should not be used on "flared: connections. Additional thread sealant or thread tape should not be applied to male pipe thread (NPT) ends where factory installed thread sealant is already present.
* The last step is to reconnect the flared swivel female coupling to the flared end of the adapter in a manner that ensures that the hose assembly is not twisted (see Figure #4).
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