4300
Catalog
Assembly / Installation
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
S12
Tube End Assembly
The assembly of the tube end consists of the following two
steps:
1.
Tube end preparation (cutting, deburring and cleaning)
2.
Assembly and installation
Tube End Preparation
Tube end preparation is a very critical step to assure the integrity
of a tube assembly. Failure to properly perform this function can
result in leakage.The three steps in proper tube end preparation
are: cutting, deburring and cleaning.
Cutting
Cut tube reasonably square (within+/- 1°) usingacircular toothed
cut-off saw (see Fig. S11), or a hacksaw with a fine tooth blade
guided by a Tru-Cut Saw Guide (shown in Fig. S12) or other
mitre-type saw guide.
Fig. S11 – Cut-off Saw on Parker’s TP432 or TP1025
Tube Preparation Center
Fig. S12– Parker’s Tru-Kut Sawing Vise used with
hacksaw
A tube cutter may be used with soft tube such as copper and
aluminum. It is not recommended for steel and stainless steel
tube because it creates a large burr on the I.D., which is difficult
to remove and creates flow restriction. Furthermore, if the tube
needs to be flared or flanged, the build up on the ID can com-
promise the sealing surface. For a steel or stainless steel tube
application, Fig. S13 illustrates a proper cut and an improper cut
(
the improper cut was performed by a tube cutter).
Improper Cut
Proper Cut
Fig. S13 – Samples of improper and proper cuts on
steel tube
Asquarecut isessential toassurea leak-freeconnection.The fol-
lowing illustrations depict what will result from an uneven cut.
Deburring
Fig. S14– Results of Uneven Tube Cuts
Inadequate
contact area
Possible nut
interference
Flare Connection
Uneven bite may result from
out-of-square tube cut
Flareless Bite
Type Connection
Possible nut
interference
Inadequate
contact area
Mechanical
Formed ORFS
Connection
Too large of a gap
impedes braze flow
Brazed ORFS
Connection
Tube End Assembly