-
bulkhead fitting jam-nuts are torqued to the correct value
-reconnectable fittings are hand tight.
(2) Do a check of all the joints with a test coupling.
(a) With the applicable test coupling, do a check for burrs, tube alignment, tube gap and tube roundness.
NOTE : The coupling has a 0.03 in. (0.7619 mm) hole (window) in
____ its center, which is the maximum permitted tube gap.
NOTE : The test coupling must move freely on the joint when the
____ tubes are aligned. Do not try to force the tubes to align with the coupling because this will cause stress in the tubing system.
(3)
Mark the tubes.
(a) Put the applicable marking gauge on each tube end. With the marking pen, color the rectangular box. These 0.03 in. (0.7619 mm) marks will be the installation marks.
(4)
Install the installation stop.
(a) On the tube you do not move, put one end of the applicable snap-on coupling in the middle of the installation mark. The snap-on coupling will be the installation stop.
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Coupling Installation Figure 267/TASK 20-23-11-991-063- 12 (SHEET 1)
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Coupling Installation Figure 267/TASK 20-23-11-991-063- 22 (SHEET 2)
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NOTE : As an alternative, you can use an applicable O-ring as an
____ installation stop. Use the test coupling to put the O-ring in the correct position on the installation mark (perpendicular to the tube axis).
NOTE : You can also use the snap-on coupling to hold the tubes
____
aligned while you do the tube set-up.
(5)
Decrease the temperature (chill) the installation tools.
(a)
Place the end of the tongs, the applicable tube chiller, and the applicable extended time tool in the workbox.
(b)
Keep the tools in the liquid nitrogen until the boiling stops.
(6)
Simulate and measure the time necessary for the installation.
(a)
With the test coupling, simulate the installation until you can do it easily. Make sure you know the obstructions that can prevent easy installation.
(b)
When you can do the installation easily, simulate the installation again, and measure the time necessary for the installation with a stop-watch.
(c)
Compare the time necessary to simulate the installation with the installation times given in the table. If the time necessary to simulate the installation is more than the recovery time, use the extended time tool.
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Recovery time after tube chilling ---------------------------------------------------------------------| Tube | Tube DIA | Aluminum | Stainless steel | Titanium | | Size | in. | mm | seconds | seconds | seconds | |------|----------|---------|----------|-----------------|----------| | -04 | 1/4 | 6.35 | 30 | 45 | 35 | |------|----------|---------|----------|-----------------|----------| | -06 | 3/8 | 9.525 | 25 | 60 | 43 | |------|----------|---------|----------|-----------------|----------| | -08 | 1/2 | 12.70 | 22 | 75 | 50 | |------|----------|---------|----------|-----------------|----------| | -10 | 5/8 | 15.875 | 21 | 70 | 43 | |------|----------|---------|----------|-----------------|----------| | -12 | 3/4 | 19.050 | 20 | 62 | 35 | |------|----------|---------|----------|-----------------|----------| | -16 | 1 | 24.400 | 20 | 50 | 25 | |------|----------|---------|----------|-----------------|----------| | -20 | 1-1/4 | 31.750 | 20 | 50 | 25 | |------|----------|---------|----------|-----------------|----------| | -24 | 1-1/2 | 38.100 | 20 | 50 | 25 | ---------------------------------------------------------------------
NOTE : The recovery times in this table are for the couplings in
____ the plastic installation package. You can increase these times if you use the extended time tool. For repairs that add a length of new tube (splice), you can decrease the temperature (chill) the new tube before you start the installation. This will give you more time for the installation of the first coupling.
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