Sea Frost DC 5000 - Manual (Page 14)

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Step 2. Prior to inserting 1/2" tubing into the Swagelok tube fitting, make a pencil mark
1" from end of tube. Prior to inserting 3/8" tubing, make a pencil mark 3/4" from the end
of the tube. With 1/4" tubing make a mark 5/8" from the end.
Step 3. Insert clean, smooth tubing with the pencil mark into the Swagelok tube fitting.
You can be sure the tube is resting firmly on the shoulder of the fitting when the pencil
mark is flush with the nut. This mark will also indicate that the tube has not moved
before tightening. (As the fitting is tightened the space from the pencil mark to the
shoulder will increase.)
Step 4. Tighten the Swagelok nut to a wrench snug* position. Scribe the nut with a
pencil at the 6:00 o'clock position (see drawing #1, step # 2).
* Wrench snug is the first point in the assembly tightening when the tube cannot be
pulled from the fitting, (i.e. when the ferrules tighten enough to contact the tubing).
Step 5. Now, while holding the fitting body with a back-up wrench, tighten the nut one-
and-one-quarter turns (1+1/4). To do so, watch the scribe mark, make one complete
revolution, and continue to the 9:00 o'clock position. (See drawing #1, step #3).
DRAWING 1
STEP 1
Simply insert the tubing into the SWAGELOK tube fitting.
Make sure that the tubing rest firmly on the shoulder
of the fitting and that the nut is wrench snug.