(3)
 Make sure that the hydraulic reservoirs and the hydraulic systems are depressurized (Ref. TASK 29-00-00-864-001) and (Ref. TASK 29-14-00-614-001).

 Subtask 20-23-11-917-072
 B. Equipment
 (Ref. Fig. 260/TASK 20-23-11-991-056)

 (1)
 CRYOFIT Installation Tooling. For installation of CRYOFIT couplings, you must use the tools below:

 -
a work box to put the parts fully into liquid nitrogen.

 -
a pair of gloves to touch the cold parts

 -
a marking pen to make the installation marks on the tubes.

 -tongs to remove the parts from the liquid nitrogen
 -
applicable tube chillers to make the tubes cold before the installation of the couplings

 -
applicable snap-on couplings or O-rings to stop the movement of the coupling (installation stop)

 -
applicable marking gages to make the installation marks

 -
applicable test couplings for the check of the tube joints

 -
applicable extended time tools to increase the recovery time of the coupling.

 (2)
 Coupling Assembly - 3PHS111-XX

 (a) Before you start the installation, make sure that you use the correct coupling assembly (Ref. Fig. 261/TASK 20-23-11-991-057)
 Subtask 20-23-11-917-073
 C. Installation Clearance
 (1) Installation package clearance.
 (Ref. Fig. 262/TASK 20-23-11-991-058)

 (a) You must have sufficient clearance to remove the installation package after the installation of the coupling.
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 CRYOFIT Installation Tooling Figure 260/TASK 20-23-11-991-056- 13 (SHEET 1)
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 CRYOFIT Installation Tooling Figure 260/TASK 20-23-11-991-056- 23 (SHEET 2)
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 CRYOFIT Installation Tooling Figure 260/TASK 20-23-11-991-056- 33 (SHEET 3)
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 Coupling Assembly - 3PHS111-XX Figure 261/TASK 20-23-11-991-057
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 Installation Package Clearance Figure 262/TASK 20-23-11-991-058
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 (2) Radial clearance. (Ref. Fig. 263/TASK 20-23-11-991-059)
 (a) The clearance around the CRYOFIT coupling installations must be sufficient for the removal of the installation package.
 NOTE : If you use the extended time tool, the clearance must be
____ greater because the extended time tool has a larger outer diameter. You can use a test coupling and an installation package or an extended time tool to do a check of the clearance.
 (3) Axial clearance. The necessary axial clearance and length of straight tube (without deformation) will change with the coupling size and the installation technique used. The length of tube engaged in each end of the coupling must be equal to half the length of the coupling. To put the coupling in position, you can:
 -
move the tube axially (if possible)

 -
move the tube laterally (deflection).

 (a) Installation of the coupling by axial movement of the tube. (Ref. Fig. 264/TASK 20-23-11-991-060) To do this procedure:
 -axially pull one tube away from the other until you can put the coupling in position
 -put the coupling in position on one tube
 -engage the other tube in the coupling.
 NOTE : For this procedure:
____
 -you must have a minimum length of straight tube (1/2 the coupling length for each tube end)
 -it must be possible to move the tube axially.
 (b) Installation of the coupling by lateral movement (deflection) of the tube (Ref. Fig. 265/TASK 20-23-11-991-061) This is an alternative to the axial movement procedure. To do this procedure:
 -move the tube to one side
 -
put the coupling on the moved tube

 -
put the tube back in position

 -engage the coupling on the other tube until the coupling is in the correct installation position.
 NOTE : For this procedure:
____
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 Radial Clearance Figure 263/TASK 20-23-11-991-059
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