API 5L L390 Pipe and tubes are supplied in a range of sizes, typically from 0.405 up to 80. Depending on project specifications, these pipes may be produced in rolled, tempered, normalized and tempered, normalized sub-critically quenched, age hardened, or stress-relieved conditions. API 5L L390 pipes are primarily intended for pipeline service where fluids such as gas, water, and oil are transported. For this reason they are commonly specified in natural gas transmission, petroleum processing, and long-distance pipeline systems. The available size range generally depends on the manufacturing capabilities of the pipe producer. Before delivery, the pipe surface is visually inspected, and manufacturers are required to meet specified inspection, material, mechanical, and chemical testing requirements.

Product identification is also an essential requirement under the specification. The API 5L L390 Pipe is typically identified by stamping or stenciling. Pipes are marked with the manufacturer’s name or the Spec 5L mark, indicating compliance with the applicable threading and product specification. In addition, the outside diameter of the pipe is usually indicated along with the letters “LP,” which denote the thread type. Pipes that do not carry the API monogram may still be marked according to the specified thread identification requirements. Manufacturers are expected to produce pipes within the dimensional tolerances defined in the standard.

Production and supply of API 5L L390 Pipe are carried out in accordance with the applicable API specifications. Care is taken during handling and packing to prevent damage during transportation. Pipes are commonly packed in wooden cases or other suitable packaging arrangements to ensure the material remains protected throughout storage, handling, and final delivery.