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13
STEP 3
Now, while holding the fitting body steady
with a backup wrench, tighten the nut 1 1/4
turns. Watch the scribe mark, make one
complete revolution and continue to the 9
o'clock position. By scribing the nut at the 6
o'clock position as it appears to you, there
will be no doubt as to the starting position.
When tightened 1 1/4 turns to the 9 o'clock
position you can easily see that the fitting
has been properly installed.
* SWAGELOK FITTINGS ARE TO BE TIGHTENED TO A TORQUE SPEC, NOT
INFINITE TIGHTNESS. BE SURE YOUR STARTING POINT IS WRENCH SNUG.
(SEE STEP 4 on page 12.) A DISTORTED TUBE MIGHT GIVE A FALSE STARTING
POINT.
* Swagelok fittings have a built-in spring interaction between the ferrules. This
compensates for temperature changes and allows the fittings to be reconnected many
times. As the fitting is tightened, a burnishing occurs between the body of the fitting and
the ferrules and between the ferrules and the tube. This action provides the tightest
connection available.
* When making all connections, USE TWO WRENCHES. Don't allow the fittings to turn
or twist when tightening.
RECONNECTING PRE-SWAGED FITTINGS
Connections can be disconnected and retightened many times.
When reconnecting, insert the tubing with pre-swaged ferrules into the fitting until the
front ferrule seats in the fitting. Tighten the nut by hand to prevent cross threading.
Tighten the nut one-quarter of a turn with a wrench (or to original one-and-one-quarter
tight position). Then snug slightly with the wrench. No more than an additional 1/8 turn.