ASME SA312 TP304L Stainless Steel Seamless Pipe Abs Certificated

At the request of the purchaser, an analysis of one billet or one length of flat-rolled stock from each heat, or two pipes from each lot shall be made by the manufacturer. A lot of pipe shall consist of the following number of lengths of the same size and wall thickness from any one heat of steel:

The grade 304L is an austenitic stainless steel that can be used in mild chemicals with less acidity and less oxidation and reduction capacity. Food and beverages industries often deal with mild acids like carbonic acids, citric acid and tartaric acids. These are found in food items and are mild acids that do not corrode the 304L material. The material has 18% chromium and 8% nickel along with other additions but with less carbon than the ordinary 304 material.

So the concentration of the chemical determines which type of steel could be used. The 304L has mild oxidation resistance, reduction resistance due to the addition of nickel and mild corrosion resistance due to the addition of chromium. So the application requirements determine which kind of chemical at which concentration could be allowed on 304L material.

Hydrostatic or Nondestructive Electric Test

Each pipe shall be subjected to the nondestructive electric test or the hydrostatic test. The type of test to be used shall be at the option of the manufacturer, unless otherwise specified in the purchase order.

For pipe whose dimensions equal or exceed NPS 10, the purchaser, with the agreement of the manufacturer, may waive the hydrostatic test requirement when in lieu of such test the purchaser performs a system test. Each length of pipe furnished without the completed manufacturer’s hydrostatic test shall include with the mandatory markings the letters “NH.”

Nondestructive Electric Test:

Nondestructive electric tests shall be in accordance with Specification A 999/A 999M.