Line Pipe Dimensions and Schedule in Millimeters Chart (API 5L)

Line Pipe Dimensions and Schedule

The line pipe dimensions and schedule is in line with a set of specifications to differentiate line pipe that can be placed under low or extreme pressures and operations. The normal bore (NB) is the American way of describing the dimension of the line pipe.

NB and the nominal pipe size (NPS) are also used interchangeably to define the size of the pipe. For example, a pipe with NPS of 7 can be identified as a 7-inch pipe. There are certain details that must be considered, like the fact that the NPS of a pipe ranging from 1/8” to 12” is neither the inner diameter (ID) nor the outer diameter (OD). For line pipe with 14” and higher NPS, this  is the same as the line pipe’s outer diameter (OD).

Line pipe schedule is one more non-dimensional number that can identify the line pipe. The  schedule of the line pipe informs oil industry operators about the wall thickness of the pipe. Such is categorized as standard weight (STD), extra-heavy (XH) or extra-strong (XS), and double extra-heavy (XXH) or double extra-strong (XXS).

Different organizations, including the American Petroleum Institute (API), have made various  revisions and additions to the line pipe schedule through the years to cope  with the growing oil and gas industry.

Line Pipe Dimensions and Schedule of API 5L

The line pipe dimensions and schedule of API 5L is provided by the API to certify the quality of the pipe for the transport of oil and natural gas. Regulation of the usage of Standard Grade A, Grade B, and Grade X pipe is included in the API standards. Both seamless and electric resistance weld (ERW) pipe are available in the API 5L specifications.

Line Pipe Dimensions and Schedule Relevance

Line pipe dimension is characterized through the outer diameter (OD,) wall thickness (WT), and length of the pipe. These measures help in the calculation of the pipe weight, pipe cost per meter or per foot, and the total pressure that the pipe can endure.

Likewise, line pipe schedule is a significant specification for oil and gas industry operators because it allows them to determine whether the pipe can be installed inside their casting and screen or not.

Line Pipe Dimensions and Schedule in Millimeters Chart (API 5L)

 

The line pipe dimensions and schedule of the API 5L pipe provides the following information: nominal bore (NB), diameter nominal (DN), outer diameter (OD) in millimeter, and pipe schedule. NB is approximately related to the inner diameter (ID) of the line pipe, while OD remains constant for each NB. Each pipe size is presented with various schedules or wall thickness.  The heavier the line pipe’s schedule is, the smaller the bore appears.

Line Pipe Dimensions and Schedule in Millimeters Chart Abbreviations:

• N.B. – Nominal Bore
• D.N. – Diameter Nominal
• O.D. – Outer Diameter
• SCH – Pipe Schedule

Leveraging Metric Line Pipe Specifications for Global Oilfield Projects

When planning and implementing pipeline infrastructure for international oil and gas operations, the Line Pipe Dimensions and Schedule in Millimeters Chart (API 5L) provides essential reference data for ensuring dimensional accuracy, regulatory compliance, and seamless integration with metric-based systems. This comprehensive metric conversion chart enables engineers and procurement specialists working on global projects to select the appropriate pipe specifications without the complexity of unit conversion, streamlining the design process and reducing the risk of specification errors. At FlowTech Energy, we maintain an extensive inventory of API 5L compliant line pipe with both imperial and metric specifications, allowing us to support oilfield projects worldwide with precise dimensional requirements.

Our experienced technical team understands the critical importance of dimensional accuracy in pipeline systems, particularly for international projects where metric specifications are standard. We can help you navigate the complexities of line pipe selection across different measurement systems, ensuring perfect compatibility with existing infrastructure and auxiliary components. Contact us today at 1-877-645-6693 to discuss how our inventory of quality metric-specified line pipe can provide the exact dimensional requirements for your global pipeline project. Whether you’re working on domestic installations requiring metric compatibility or international projects adhering to metric standards, our comprehensive selection of API 5L line pipe ensures you’ll find the precise specifications needed to optimize both installation efficiency and long-term operational performance throughout your pipeline system’s lifecycle.

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