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Subtask 20-23-38-320-058
C. Tube Repair Procedure
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.
R NOTE : The H-fitting is approved for the permanent repair of middle line
____ R tubes when:
-the applicable swaging equipment or other special tools are not
available, R - there must be an immediate repair (this repair procedure is R faster than other repair procedures).
There are four different types of repair procedures
(Ref. Fig. 202/TASK 20-23-38-991-037)
Use the applicable fitting (refer to the H-fitting Dimension and
Part Number Table).
(Ref. Fig. 228/TASK 20-23-38-991-038)
Each fitting is supplied in a plastic bag which also contains a
positioning template and tape.
(1) Installation procedure for SIERRACIN/HARRISON H-fittings. (Ref. Fig. 229/TASK 20-23-38-991-039)
NOTE : You can repair defects or chafing areas that are less than or
____ equal to 9.52 mm (0.37 in.). across. You must splice defects that are larger. The minimum dimension that you can splice is
114.3 mm (4.50 in.).
(a)
Carefully clean the ends of the tube with CLEANING AGENTS (Material No. 11-003). Make sure that the tube I.D. and O.D. are clean.
(b)
Use the template to find the position of the tape (2) on the tube at from 14.22 +0.5 -0 mm (0.56 +0.02 -0.00 in.) the end of the tube.
(c)
Find the tube insertion mark at 36.6 +0 -0mm (1.44 +0.00 0.00 in.) from the other end of the tube.
(d)
Put the nut (1), the union (2), the coupling (3) and the slide
(4) in the correct sequence in position on the tube.
(e)
Move on only one layer of tape (5). Cut off the unwanted tape.
(f)
Put the union (2) in position against the tape (5).
(g)
Engage the slide (4) on the tube. The rounded end of the slide must be against the union (2).
(h)
Engage the nut (1) on the slide (4) side.
(i)
Engage the coupling (3) on the union (2) side.
(j)
Engage the nut (1) in the coupling (3) and tighten it with the union (2) against the tape (5).
(k)
Hold the coupling end (3). NOTE : Do not turn the coupling (3).
____
(l)
Tighten the nut (1) until you feel resistance. This occurs when the slide (4) and the coupling (3) close tightly against the union (2).
(m)
Make sure that you can see the insertion mark on the tube.
(n)
Remove the nut (1). Make sure that the slide (4) and the coupling
(3) are between 3.8 mm (0.15 in.) and 0 mm (0.00 in.) from the shoulder of the union. If not, tighten the nut (1) until the slide (4) and the coupling (3) are in the correct position.
(o)
The union (2) must touch the tape (5).
(p)
The edge of the coupling (3) must be across the mark on the tube.
(q)
Tighten the assembly to complete the swaging procedure.
Part Numbers and Dimensions of a Fitting
Figure 228/TASK 20-23-38-991-038
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Fitting Installation
Figure 229/TASK 20-23-38-991-039
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Subtask 20-23-38-790-054
D. Do the Leak Check of the Repaired Tube.
(1) Do the leak test of the potable water lines.
(a) Remove the warning notice(s).
R (b) Fill the potable water system with water (Ref. TASK 12-15-38-613-R 001)
(c)
Pressurize the potable water system (Ref. TASK 38-10-00-614-001)
(d)
Examine the repaired tubing for leaks.
(2) If there is leakage, slowely and continuously increase the torque value to the maximum authorized (maximum test value) until you stop the leak. (Ref. Fig. 217/TASK 20-23-38-991-026)
NOTE : Leaks are not permitted.
____
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