GE Analytical Instruments ©2006 11-4 DLM 14291 Rev. A
The connections to the purge vessel are made using Swagelok
®
brand connectors.
The connection consist of four parts (see Figure 11-2):
• A 1/4” stainless steel nut
• A 1/4” Teflon back ferrule (HTF 24034)
• 1/4” Teflon front ferrule (HTF 24033)
• 1/4” to 1/8” reducing union (HTF 44200)
Three different 1/8" Teflon lines are used with the purge vessel:
• Purge Line (ASM 00430) – a 6 ft length of 1/8” Teflon tubing with a 1/8" to 1/4"
SS reducing union on one end and an 1/8" nut and ferrules on the other end.
• Bubbler Line (ASM 00440) – a 1 ft length Teflon tubing with 1/8" to 1/4" SS
reducing unions on both ends.
• Filter Line (ASM 00450) – a 3 ft length of Teflon tubing with an in-line filter, a
1/4" nut and Teflon ferrules on one end and an 1/8" nut and ferrules on the
other end.
Install the Purge Line by loosening the 1/4" nut and carefully sliding the 1/4" nut
and reducing union containing the Teflon ferrules over the 1/4" OD glass on the gas
inlet of the purge vessel (see Figure 11-2). In some cases, the OD of the glass is
slightly larger than 1/4" and it may necessary to disassemble the 1/4" nut and
ferrules and slip the nut and ferrules over the glass on the purge vessel.
Procedure for Tightening Swagelok Fittings
• Grasp the reducing union with one hand.
• Carefully screw the 1/4” nut onto the reducing union with the other hand until
finger tight
• When the fitting is loose, the reducing union can be easily rotated using two
fingers. When the fitting is tight, the union cannot be easily rotated with two
fingers. Since the Teflon ferrules will slide on the glass, the union can be
rotated when the fitting is tight, but some force will be required to turn the
union.
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