(2)
Use this approved procedure to repair tubes made of 21-6-9 corrosion-resistant steel.
NOTE : This repair procedure uses a tube-expansion swaging method
____
with an elastomeric expander.
(3)
The use of sleeve and union lets you make a connection that you can disassemble between two tubes or between a tube and a system component. (Ref. Fig. 201/TASK 20-23-38-991-015)
(4)
To repair a tube with sleeve and union, you must: (Ref. Fig. 204/TASK 20-23-38-991-016)
-cut the tube with a chipless cutter and remove the damaged section,
-square and deburr the ends of the tubes,
-clean the tubes,
-install the sleeve nut, the sleeve and the union on the tubes,
-swage the tubes into the sleeve and the union,
-connect the ends of the tubes with the sleeve, the nut and the union.
(5)
You must use the applicable swaging tools to swage the tube.
4. Procedure
_________
Subtask 20-23-38-320-053
A. Procedure
WARNING : MAKE SURE THAT THE EQUIPMENT YOU USE FOR THIS PROCEDURE IS
_______ CLEAN AND APPROVED FOR THE POTABLE WATER SYSTEM. IF NOT IT CAN CAUSE CONTAMINATION OF THE POTABLE WATER SYSTEM.
(1) Cut the Tube
(a)
Remove the damaged parts of the tube and the defective ends with the applicable PERMASWAGE chipless cutting-tool: (Ref. Fig. 203/TASK 20-23-38-991-004) D12531-001, tubes of 1/2", 3/4" and 3/8".
(b)
Put the tubing cutter into the correct position on the tube.
(c)
Tighten the drive screw until the cutter wheel lightly touches the tube. Then give the drive screw a 1/8 to 1/4 turn.
(d)
Turn the ratchet handle through the arc of clearance until it turns loosely.
(e)
Do the steps (b) thru (d) again to cut through the tube.
(f)
Cut the tube slowly and smoothly to make sure that the end of the tube does not change its shape.
1_ observe the dimension A between the two tubes
(Ref. Fig. 204/TASK 20-23-38-991-016)
2_ make sure that the length of the straight section of the tube
is the minimum necessary for the swaging operation.
(Ref. Fig. 205/TASK 20-23-38-991-017)
NOTE : If the damaged section is too large or too near the____
bend, you can replace the damaged section with a new
tube. In this case, you must use two HARRISON fittings.
Repair of a Tube with Fittings
Figure 204/TASK 20-23-38-991-016
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Length of the Straight Tube Required for Swaging
Figure 205/TASK 20-23-38-991-017
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NOTE : Lubricate regularly the ratchet, the rollers and the
____ cutter wheel with OILS (Material No. 03-001) for easy operation.
(g) Carefully square, deburr and champfer the ends of the tubes internally and externally. Use a deburring tool. (Ref. Fig. 206/TASK 20-23-38-991-051, 207/TASK 20-23-38-991-005, 208/TASK 20-23-38-991-018)
(2) 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.
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