TM55-2840-251-23
8-2
OIL LINES AND FITTINGS (Continued)
8-2-3 INSPECTION
1.
Inspect for:
a.
Scratches. Circumferential scratches are
acceptable, providing they do not exceed 45 degree
segment on circumference. Any number of scratches
are permissible. Longitudinal scratches must not
exceed 0.500 inch in length; any number of scratches
within these limits are permissible. Blend out either type
of scratch formation, providing depth of blend does not
exceed 0.005 inch.
b.
Nicks and Chafing. Acceptable, providing
75% of wall thickness remains after blending. Each
blended area must not exceed one-half square inch.
c.
Dents. Round bottom dents are permissible,
provided the depth is not greater than 10% of the
normal outside diameter of the tube. No more than
three dents to the maximum depth per 12 inch length of
tube is permissible, and such dents shall be separated
by at least 0.250 inch. No dents are to be within 0.250
inch of ferrules or fittings.
NOTE
Dents are unacceptable within one inch of
ferrule scarf-welds, or in the area of a
bend.
d.
Pits. Minor isolated pitting is allowed, if
pitting is not greater than 0.003-inch in depth. Clusters
of pits should be blended out to a maximum depth of
0.005-inch.
e.
Corrosion. Rust and stains are acceptable,
providing they can be removed by light polishing with
Crocus Cloth (E.41).
8-2-4 REPAIR
1.
Scratches, nicks, chafing, and pits which are within
the requirements of Task 8-2-3. After blending, touch-
up the reworked area as follows:
a.
Wash affected area with a solution of mild
soap and fresh water. Wipe dry with a clean, soft lint-
free cloth.
b.
Apply Alodine (E.40) solution liberally with a
swab. Allow solution to remain on surface for not less
than three minutes, but not more than five minutes.
c.
Rinse treated area with clean, fresh water
and wipe dry with a clean, lint-free cloth.
NOTE
After alodine treatment, affected area will
appear to have a rust stain.
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