Repair of a Union
 Figure 232/TASK 20-23-38-991-042
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 Repair of a Tube End
 Figure 233/TASK 20-23-38-991-043
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 Repair of an Elbow
 Figure 234/TASK 20-23-38-991-044
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 (3) Clean the Tube

 WARNING : USE SOLVENTS/CLEANING AGENTS, SEALANTS AND OTHER SPECIAL
_______ MATERIALS ONLY WITH A GOOD SUPPLY OF AIR. OBEY THE MANUFACTURERS INSTRUCTIONS. PUT ON PROTECTIVE CLOTHING. DO NOT GET THEM IN YOUR MOUTH. DO NOT SMOKE. DO NOT BREATHE THE GAS. THESE MATERIALS ARE POISONOUS, FLAMMABLE AND SKIN IRRITANT. GET MEDICAL HELP IF YOUR SKIN OR EYES BECOME IRRITATED.
 WARNING : USE A PROTECTIVE EYE SHIELD/GOGGLES WHEN YOU USE COMPRESSED
_______ AIR. DEBRIS AND/OR HIGH PRESSURE AIR CAN DAMAGE YOUR EYES.
 WARNING : USE THE CORRECT PERSONAL PROTECTION.
_______ COMPRESSED AIR WILL CAUSE LOOSE PARTICLES THAT CAN GET IN YOUR EYES. THE AIRSTREAM CAN CAUSE CUTS, DO NOT POINT IT AT YOUR SKIN.
 (a)
 Clean the end of the tube with CLEANING AGENTS (Material No. 11-003).

 (b)
 Blow air through the tube to remove all swarf and other foreign material.

 (4) Install the fitting.
 (a) Put the nut and the sleeve on the tube.
 NOTE : Make sure that the cutting edge of the sleeve points to
____
 the end of the tube.

 (b) Lubricate with COMMON GREASE (Material No. 04-003):
 NOTE : No grease permitted in the tube.
____
 -
the threads and the contact face of the nut,

 -
the threads of the union.

 (c) Put the end of the tube into the fitting.
 (5) Do the Swaging (Ref. Fig. 235/TASK 20-23-38-991-045)
 (a) Hold the tube against the shoulder of the union and tighten the nut fully with your hand.

 Initial Torque Values/Torque Values for the Nuts MS21921
 Figure 235/TASK 20-23-38-991-045

 (b) From this position, tighten the nut to swage the sleeve (obey the number of turns for the nut).
 (6) Do a check of the tube joint.
 (a)
 Loosen the nut and examine the swaging of the sleeve:

 -there must be a small bulge between the cutting edge and the contact shoulder of the nut,
 -
the surface of the sleeve must be smooth (there must be no cracks or surface defects),

 -
the end of the sleeve must not be flat (the nut must move freely along the sleeve).

 (b)
 Install the lines. Use the specified torque values (refer to the table). (Ref. Fig. 235/TASK 20-23-38-991-045)

 NOTE : You must use these torque values each time that you
____
 assemble the tubes.

 (7) Clean the Tube
 WARNING : USE SOLVENTS/CLEANING AGENTS, SEALANTS AND OTHER SPECIAL
_______ MATERIALS ONLY WITH A GOOD SUPPLY OF AIR. OBEY THE MANUFACTURERS INSTRUCTIONS. PUT ON PROTECTIVE CLOTHING. DO NOT GET THEM IN YOUR MOUTH. DO NOT SMOKE. DO NOT BREATHE THE GAS. THESE MATERIALS ARE POISONOUS, FLAMMABLE AND SKIN IRRITANT. GET MEDICAL HELP IF YOUR SKIN OR EYES BECOME IRRITATED.
 (8) Clean the end of the tube with CLEANING AGENTS (Material No. 11-003).
 5. Close-up
________
 Subtask 20-23-38-780-053
 A. Do the Pressure Test of the Tube
 (1)
 Connect the HARRISON sleeve and union of the tube and TORQUE it to the normal value. (Ref. Fig. 218/TASK 20-23-38-991-027)

 (2)
 Pressurize the tube to an operational pressure.

 (3)
 If there is leakage, slowly and continuously increase the torque value to maximum authorized (maximum test value) until you stop the leak.

 (4)
 Make sure that there is no leakage.
 NOTE : Leakage is not permitted.

____ Subtask 20-23-38-410-055
 B. Install the Repaired/New Tube (Ref. TASK 20-23-38-400-003)

 TASK 20-23-38-400-003

R Installation of the Tubes Assembly of the Potable Water and Air Supply System
 NOTE : The procedure is the same for both the potable water and the air supply
　
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