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|  MILT8504B
4.3 Quality conformance inspection. Quality conformance inspection shall consist of
sampling plans A through J specified herein. Samples shall be labeled completely with
information identifying the purpose of the sample, name of product, specification
number, lot number, date of sampling and contract number.
4.3.1 Inspection
4.3.1.1 Inspection lot. A lot shall consist of one size and wall thickness from one heat of
steel, and annealed in the same charge (batch anneal) or all tubing of the same size
and heat annealed at the same temperature, time and atmosphere, without interruption,
in a continuous furnace.
4.3.2 Surface condition
4.3.2.1 Conditioning of surface. A 1foot section shall be selected from each lot of
tubing and split lengthwise. Onehalf shall be immersed in an aqueous solution of 15
percent nitric acid and 3 percent hydrofluoric acid by volume at 100F to 120F for 15
minutes. After immersion, the specimen shall be washed and dried. The two halves
shall then be compared as to the appearance of inner and outer surfaces. Difference in
color and appearance, other than minor changes in shade and texture, shall be cause
for rejection.
4.3.2.2 Loose material. Wads of firmly compacted clean white cloth or fibrous material
shall be forced through the bore of each of two sample tubes selected from each lot,
and any soiled areas examined at 10 x magnification for the presence of grit, metallic
flakes, or other detrimental materials. The presence of such particles shall be cause for
rejection.
4.3.2.3 Surface roughness. A 1foot section shall be selected from each lot of tubing
and split lengthwise. The inner and outer surfaces of both halves shall be examined for
surface waviness and lay in accordance with ANSI B 46.1. The failure of any tubing to
meet the requirements of 3.5.1 shall be cause for rejection.
4.3.2.4 Examination of samples. Samples selected in accordance with table V shall be
examined for conformance to dimensions and tolerances (3.7), weld bead (3.8),
straightness (3.9), length (3.10) identification marking (3.11), workmanship
requirements (3.12) and preparation for delivery (section 5).
TABLE V. Sampling plan
Lot size
Sample size
Acceptance No.
1 to 110
5
0
111 to 500
7
0
501 to 800
10
0
801 to 1200
15
0
Over 1200
25
0
7
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