2.3.1.1 Assembling new fittings
For metallic (SST or MP35N) fitting and tubing assemblies with ferrules not previously assembled
or set to tubing, you must mark the compression screw and connection port and ensure that the
two marks line up when you tighten them.
Warning: To avoid eye injury, use eye protection when performing this procedure.
Notice: To prevent contaminating system components, wear clean, chemical-resistant,
powder-free gloves when performing this procedure.
Required tools and materials
• Chemical-resistant, powder-free gloves
• Protective eyewear
• 1/2-inch open-end wrench
• 1/4-inch open-end wrench – for tightening or loosening stainless steel (gold-plated) fittings
with two-piece ferrules
• Column gripping tool – for holding the column while tightening or loosening the dual-threaded
fitting
• Permanent marker
To assemble the new fittings:
1. Insert the end of a tube into the hexagonal end of the compression screw.
2. Insert the tube into the larger end of the ferrule.
3. Insert the tube into the connection port.
4. Rotate the compression screw, clockwise, into the connection port until the screw is finger-
tight.
5. Using a permanent marker, mark the compression screw at the 12-o’clock position.
6. Mark the connection port at the 9-o’clock position.
7. Ensure that the tubing makes contact with the bottom of the connection port, and then use
the 1/4-inch open-end wrench to rotate the compression screw clockwise 3/4-turn until the
two marks line up.
December 4, 2019, 715005052 Version 02 (previously released as Rev.B)
Page 40
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