Test Codes - Hose Assembly Installation Guide - RYCO Hydraulics

Hose Assembly – Installation Guide

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.

Straight Hose Installations

When hose installation is straight, allow enough slack in hose line to provide for length changes that will occur when pressure is applied.

Flexing Applications

Adequate hose length is necessary to distribute movement on flexing applications, and to avoid abrasion.

Twists and Bends part 1

When radius is below the required minimum, use an angle adaptor to avoid sharp bends.

Twists and Bends part 2

Avoid twisting of hose lines bent in two planes by clamping hose at change of plane.

Twists and Bends part 3

Use proper angle adaptors to avoid sharp twists or bends in the hose.

Twists and Bends part 4

Prevent twisting and distortion by bending hose in same plane as the motion of the boss to which hose is connected.

Reduce number of pipe fittings

Reduce number of pipe thread joints by using proper hydraulic adaptors instead of pipe fittings.

Use 45° and/or 90° adaptors

Route hose directly by using 45° and/or 90° adaptors and fittings. Avoid excessive hose length to improve appearance.

Allowing length change

To allow for length changes when hose is pressurised, do not clamp at bends. Curves will absorb changes. Do not clamp high and low pressure lines together.

Avoid twisting hose

When installing hose, make sure it is not twisted. Pressure applied to a twisted hose can result in hose failure or loosening of connections.

High Temperature

High ambient temperatures shorten hose, therefore ensure hose is kept away from hot parts. If this is not possible, insulate hose.

Relieve strain

Elbows and adaptors should be used to relieve strain on the assembly, and to provide neater installations which will be more accessible for inspection and maintenance.

Avoid collapse and restrictions

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 Abrassion

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.

HOSE SIZE "B" CONSTANT FOR STRAIGHT PORTION
INCLUDING COUPLING
DN inch Dash
6 1/4 -04 250 mm (10″)
10 3/8 -06 250  mm (10″)
12 1/2 -08 300  mm (12″)
19 3/4 -12 350  mm (14″)
25 1 -16 400  mm (16″)
31 1.1/4 -20 450  mm (28″)
38 1.1/2 -24 500  mm (20″)
51 2 -32 500  mm (20″)

If the connection is to be undone and then reassembled:

First tighten the S134 Nut onto the JIC male thread by hand. When the S134 Nut cannot be further hand tightened, tighten it with a spanner one more hex flat (1/6 of a turn).
RYCO S134 J-Loks may be reassembled in this manner approximately ten times.

Typical dimensions for One and Two wire braid hose