Page 446 - 4300 Catalog Cover.pdf

4300 Catalog Assembly / Installation
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
T36
Routing and Clamping
Most hydraulic, pneumatic and lubrication
system requires some form of tube line
fabrication and fitting installation for comple-
tion. Proper fabrication and installation are
essential for the overall efficiency, leak free
performance, and general appearance of
any system.
The following factors should be considered
early in the design process, after sizing the
tube lines and selecting the appropriate
style of fitting:
1. Proper routing of tube lines
2. Adequate tube line support (clamping)
Routing of Lines
Routingof lines isoneof themost difficult, yet
most significant of these systemdesign con-
siderations. Proper routing involves getting
a connecting line from one point to another
through themost logical path,whileconsider-
ing other factors as discussed below.
The most logical path is not always the
direct path and should have the following
characteristics:
• Avoid excessive strain on joint — A
strained jointwill eventually leak.Astraight
line tube assembly (with no bends) or a
joint that is forced into position are com-
mon examples of strain applied to tube
assemblies.
• Allow for expansion and contraction
— Use a “U” bend or a hose in long lines
toallow for expansionandcontractiondue
to pressure or temperature fluctuations.
• Allow for motion under load — Even
some apparently rigid systems do move
under load. Use an offset (“S”) bend.
• Get around obstructions without us-
ing excessive amount of 90° bends
— Pressure drop due to one 90° bend is
greater than that due to two 45° bends.
• Keeptube linesaway fromcomponents
that require regular maintenance.
• Leave fitting joints as accessible as
possible — Inaccessible joints are more
difficult to assemble and tighten properly,
and more time consuming to service.
• Have a neat appearance and allow for
easy trouble-shooting, maintenance
and repair.
The following illustrations provide several
examples of typical routing situations. The
graphics show the preferred and non-pre-
ferred path along with an explanation.
Non-preferred Routing Preferred Routing
Avoid straight tube lines.
There is no margin for error on a
straight line, resulting in excess
joint strain.
Explanation
Allow for expansion and contrac-
tion of lines by utilizing “U” bend.
Offset (“S”) bend allows for mo-
tion under load.
Avoid excessive pressure drop
by getting around obstructions
without using 90° bends. One
90° bend causes more pressure
drop than two 45° bends.
Avoid creating an obstruction by
routing lines around areas that
require service. Leave adequate
clearance for wrenches.
Route lines to allow for proper
clamping. When done properly,
several lines can typically be
clamped together.
Route lines to allow for trouble-
shooting. Lines that cross and
are not in logical order tend to
be difficult to work with during
maintenance.
Routing and Clamping