Dual Stenciling of Pipe

It's probably in here:↓

Update on the API Work Group Activities on Pipe Markings - ↓

Historically, it has been a common practice to apply dual-grade markings at the lower end of the grade spectrum.

Marking of Pipe to Multiple Grades:

Marking of pipe to multiple grades is permitted only by agreement between the purchaser and the manufacturer within the following guidelines:

- Pipe may have multiple markings within the following grade ranges:

< X42

X46, X52, X56 (including intermediate grades)

For X60 & above, marking of multiple grades is prohibited

- The manufacturer is responsible to assure that the pipe conforms to all requirements of each of the certified grades. This allows pipe to be used as any of the grades individually.

- Pipe shall be marked to only one PSL level.

- Where pipe is marked to multiple grades, a single certification document shall be issued referencing the grade combination as marked on the pipe. The certification document may contain a specific statement that pipe conforms to each grade individually.

- Pipe shall only be re-graded and re-marked under the manufacturer's control. Certificates for re-graded pipe may only be issued by the pipe manufacturer.