MIL-T-85048
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 1-foot section shall be selected from each lot of tubing and split lengthwise. One-half shall be immersed in an aqueous solution of 15 percent nitric acid and 3 percent hydrofluoric acid by volume at 100°F to 120°F 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 1-foot 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 110 111 to 500 501 to 800 801 to 1200 Over 1200 |
5 7 10 15 25 |
0 0 0 0 0 |
7
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