How to verify the Cleanliness of Stainless Steel Tubing

As we know, the Cleanliness of Stainless Steel Tubing is very important. According to ASTM A632 S3. Cleanliness. We know how to tesing or check the Cleanliness of Stainless Steel Tubing.

• S3.1 When specified, tubing shall be supplied thermocouple clean on the inside surface. Thermocouple clean is defined as being free of all drawing compounds, carbon, dirt, dust, visible surface oxides, scale, and other contaminants.
• S3.1.1 Verify the freedom from inside visible surface oxides and scale by cutting two short lengths of tubing as specimens and longitudinally sectioning both. Pickle one of the specimens in accordance with Specification ASTM A 380 and then wash both. Visually, without magnification, compare the pickled and unpickled specimens to confirm that neither exhibits surface oxides or scale on their inside surfaces.
• S3.1.2 Verify cleanliness and freedom from contaminants, such as drawing compounds, carbon, dirt, and dust, by passing a solvent-saturated swatch of lint-free yarn or cloth, or a felt plug through the tube. Isopropyl alcohol, methanol, ethanol, denatured alcohol, or acetone followed by alcohol are accept-able solvents. Because acetone leaves a residual film, cleaning with acetone alone is not acceptable. While a heavy discolora-tion of the swatch or plug is unacceptable, a light discoloration is acceptable unless particles of grit or metallic flakes are visually detectable without the use of magnification.
• S3.2 After verifying that the inside surface is thermocouple clean, the tubing shall be capped or otherwise protected to ensure cleanliness upon arrival at its destination. The producer and purchaser shall agree on the method of protection.

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