Page 407 - Brass, Composite and Thermoplastic Fittings and Valves

Catalog 3501E

Tube Line Fabrication Guide

for Leak Free Systems General Technical

Every hydraulic, pneumatic and lubrication system The most logical path should have the
requires some form of tube line fabrication and fitting following characteristics:
installation for completion. Proper fabrication and
installation are essential for the overall efficiency, leak free ■ Avoid excessive strain on joint — A strained joint
performance, and general appearance of any system. will eventually leak. (See Figures A14 through A21.)
■ Allow for expansion and contraction — Use
Start by planning ahead. After sizing the tube lines a “U” bend or a hose in long lines to allow for
and selecting the appropriate style of fitting, consider expansion and contraction. (See Figure A22.)
the following in the design of your system:
■ Allow for motion under load — Even some apparently
1. Accessibility of joints rigid systems do move under load. (See Figure A23.)
2. Proper routing of lines ■ Get around obstructions without using
3. Adequate tube line supports excessive amount of 90° bends — Pressure
4. Available fabricating tools drop due to one 90° bend is greater than that due
to two 45° bends. (See Figures A24 and A25.)
Routing of Lines ■ Keep tube lines away from components that require
Routing of lines is probably the most difficult yet most regular maintenance. (See Figures A26 and A27.)
significant of these system design considerations. ■ Have a neat appearance and allow for
Proper routing involves getting a connecting line from easy troubleshooting, maintenance and
one point to another through the most logical path. repair. (See Figures A28 and A29.)

Always try to leave fitting joints as accessible as
possible. Hard to reach joints are hard to assemble
and tighten properly. Inaccessible joints are also
more difficult and time consuming to service.

Fig. A14 — Correct Routing Fig. A15 — Incorrect Routing Fig. A18 — Correct Routing Fig. A19 — Incorrect Routing

Fig. A16 — Correct Routing Fig. A17 — Incorrect Routing
Fig. A20 — Correct Routing Fig. A21 — Incorrect Routing

(continued next page)

Parker Hannifin Corporation | Fluid System Connectors | Otsego, MI N7