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Axial Clearance - Axial Tube Movement Figure 264/TASK 20-23-11-991-060- 12 (SHEET 1)
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Axial Clearance - Axial Tube Movement Figure 264/TASK 20-23-11-991-060- 22 (SHEET 2)
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Axial Clearance - Tube Deflection Figure 265/TASK 20-23-11-991-061
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-axial movement of the tube is not necessary
-you must have a length of straight tube (without deformation) on one end equal to the full length of the coupling.
(4)
Tube bend location.
(a) Tube bends prevent movement of the coupling. The coupling can be against a bend (or a bump) if you have sufficient clearance to install the coupling correctly.
(5)
Increase in assembly dimension (growth).
(a)
When a CRYOFIT coupling decreases (shrinks) in diameter, its length increases and moves the two tubes apart. You must think about this when you make the decisions about the coupling installation procedure (tube lengths, bend locations, bumps).
(b)
Calculated increase in length (growth) after assembly. ----------------------------------------------------------| Tube | Tube DIA | Aluminum, stainless steel, | | Size | | titanium | | | in. | mm | in. | mm | |------|----------|---------|-------------|--------------| | -04 | 1/4 | 6.35 | .016 | 0.40 | |------|----------|---------|-------------|--------------| | -06 | 3/8 | 9.525 | .020 | 0.50 | |------|----------|---------|-------------|--------------| | -08 | 1/2 | 12.70 | .026 | 0.66 | |------|----------|---------|-------------|--------------| | -10 | 5/8 | 15.875 | .034 | 0.86 | |------|----------|---------|-------------|--------------| | -12 | 3/4 | 19.050 | .037 | 0.94 | |------|----------|---------|-------------|--------------| | -16 | 1 | 25.4 | .040 | 1.02 | |------|----------|---------|-------------|--------------| | -20 | 1-1/4 | 31.750 | .045 | 1.14 | |------|----------|---------|-------------|--------------| | -24 | 1-1/2 | 38.10 | .059 | 1.50 | ----------------------------------------------------------
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4. Procedure
_________
Subtask 20-23-11-917-074
A. Preparation
(1)
Put marks on the tube where you will cut the tube to remove the damaged part. When you put the marks on the tube, think about:
-access for the tube cutter and the CRYOFIT couplings
-where to release the tube. For installation of the coupling, a minimum of one tube end must be free to move
-possible future problems and a new routing of the tube (where permitted) to prevent chafing or contact with parts that move
-drainage of hydraulic fluid
-sufficient straight length of tube after removal of the damaged part
-minimum splice length
(Ref. Fig. 266/TASK 20-23-11-991-062)
-assembly growth
-removal and replacement of paint or other protections on the tube adjacent to the repair.
(2)
If possible, drain the line near the location of the repair.
(3)
Cut the tube and remove the damaged part. A chipless roller-type cutter is recommended.
(4)
Make sure that the tube ends are free of burrs (inner side and outer side). Deburr if necessary. Use an applicable deburring tool to prevent damage or contamination of the fluid system.
(5)
If applicable, remove paint or other protection, with Grade 400 emery cloth, on one coupling length of the cut tube ends. Make sure that you do not scratch the tube when you remove the protection.
(6)
Cut, deburr and remove paint from all tubes you will use to replace the damaged part of tube.
(7)
Make sure that all the tube ends are in the correct condition and agree with the tube dimension specifications (Ref. TASK 20-23-11-200-001).
(8)
Clean all the tube ends with CLEANING AGENTS (Material No. 11-003).
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Minimum Splice Length Figure 266/TASK 20-23-11-991-062
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Subtask 20-23-11-917-075
B. Coupling Installation (Ref. Fig. 267/TASK 20-23-11-991-063)
NOTE : To install all CRYOFIT couplings, you do these steps:
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