The overall length of the hose assembly is measured to the sealing surface of straight fitting or to the centerline of elbow fitting . As the following.
| Length of hose assembly | tolerance | ||
| Hose DN≤25 | 25<Hose DN≤50 | Hose DN>50 | |
| assembly length<630 | +7mm -3mm |
+12mm -4mm |
+25mm -6mm |
| 630< assembly length≤1250 | +12mm -4mm |
+20mm -6mm |
|
| 1250< assembly length≤2500 | +20mm -6mm |
+25mm -6mm |
|
| 2500< assembly length≤8000 | +1.5% -0.5% |
||
| assembly length>8000 | +3% -1% |
||
Whenever 2 elbow fittings are used,the displacement angle needs to be specified.Point the end of coupling 1 to a vertical position as shown in the diagram,measure the angle in a clockwise airection from the center line of couoling 1 to the coupling 2, the measured angle is called the displacement angle.eg.if the angle is 225 degree, the displacement angle is written as v255.
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