Page 496 - 2019 PRODUCT TECHNICAL MANUAL - HYDRAULICS V4-8

TECHNICAL
HOSE ASSEMBLY - INSTALLATION GUIDE
INSTALLATION GUIDE - HOSE ASSEMBLY (CONT)
Proper hose installation is essential for satisfactory performance. If hose length is excessive, the appearance of the installation will be unsatisfactory and unnecessary cost of equipment will be involved. If hose assemblies are too short to permit adequate flexing and changes in length due to expansion or contraction, hose service life will be reduced.
The following diagrams show proper hose installations which provide maximum performance and cost savings. Consider these examples in determining length of a specific assembly.
AVOID COLLAPSE AND RESTRICTION
• To avoid hose collapse and flow restriction, keep hose bend radii as large as possible.
• Refer to hose specification tables for minimum bend radii.
AVOID ABRASION
• Run hose in the installation so that it avoids rubbing and abrasion.
• Often, clamps are required to support long hose runs or to keep hose away
from moving parts.
• Use clamps of the correct size. A clamp too large allows hose to
move inside the clamp and causes abrasion.
NOTE
• When determining the length of hose assemblies, provide sufficient length to prevent bending strain from localising at the back of the coupling. In the ‘TYPICAL DIMENSIONS FOR ONE & TWO WIRE BRAID HOSE’ diagram below, measurement “B” allows for a strain section of hose beyond the coupling to prevent concentration of bending strain. “T” designates the amount of travel. “A” indicates the smallest diameter to which hose should be bent.
• OVERALL LENGTH = B+1.57A+T
TYPICAL DIMENSIONS FOR ONE & TWO WIRE BRAID HOSE
HOSE SIZE
"B" CONSTANT FOR STRAIGHT PORTION INCLUDING COUPLING
DN
10 19 31 51
inch Dash
6
1/4
-04
250 mm (10”)
3/8
3/4 1.1/4 2
-06 -12 -20 -32
250 mm (10”) 350 mm (14”) 450 mm (28”) 500 mm (20”)
12
1/2
-08
300 mm (12 )
25
1
-16
400 mm (16”)
38
1.1/2
-24
500 mm (20”)
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