Teledyne Princeton Instruments PI-MTE, System Manual

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100 PI-MTE System Manual Issue 6
3. Hold the fitting body steady with a backup wrench and tighten this nut 1¼ turns.
Watch the scribe mark, making one complete revolution and continue to the 9
o’clock position.
Figure C-10: Tighten Retaining Nut
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 the nut is tightened 1¼ turns to the 9 o’clock position,
you can easily see that the fitting has been properly tightened.
NOTES:
1. Use of the Gap Inspection Gauge (1¼ turns from
finger-tight) ensures sufficient pull-up.
2. For 1/16”, 1/8”, 3/16”, 2 mm, 3 mm, and 4 mm size tube
fittings, only ¾ turn from finger tight is necessary.
3. A Swagelok Hydraulic Swaging unit must be used for
assembly of Swagelok Tube Fittings onto 1¼”, 1½”, 2”,
28 mm, 32 mm, and 38 mm outside diameter steel and
stainless steel tubing.
C.2.2 High Pressure Applications or High-Safety-Factor Systems
Due to variations in tubing diameters, a common starting point is desirable. Using a
wrench, tighten the nut to the snug position which is determined by tightening the nut
until the tubing will not rotate freely (by hand) in the fitting.
NOTE:
If tube rotation is not possible, tighten the nut
approximately 1/8 turn from the finger-tight position.
At this point, scribe the nut at the 6 o’clock position and tighten the nut 1¼ turns. The
fitting will now hold pressures well above the rated working pressure of the tubing.
C.2.3 Tightening Procedure
Connections can be disconnected and reconnected many times. The same reliable
leak-proof seal can be obtained every time the connection is remade.
Perform the following procedure to reconnect Swagelok fittings:
1.
Figure C-11 illustrates the fitting in the disconnected position.
Figure C-11: Disconnected Fitting
4
4
11-
009
7_
006
6
4
4
11-
009
7_
00
6
7