Pipe is specified by a nominal size, not its real bore. NPS (Nominal Pipe Size, inch-based) and DN (Diameter Nominal, the ISO/metric designation) are two names for the same nominal size — they are a label, and the actual outside diameter is fixed for a given size while the wall thickness changes with schedule. Only NPS 14 and above have an OD equal to the nominal inch value; below that the OD is larger than the name (e.g. NPS 2 has a 60.3 mm OD, not 50.8 mm).
Every outside diameter and wall thickness is taken directly from the governing dimensional standard, not interpolated or assumed.
Our expertise spans multiple industries with sector-specific water treatment solutions.
Explore closely-related tools, references and guides
Send your influent analysis and our engineers assess your process and recommend a tailored treatment solution — free, confidential and no obligation.
Select the regulatory standard for your country — it sets which parameters we need for a compliance-aware process assessment.
Required parameters for the chosen standard are flagged on the sample form. You can still submit a partial set and we will advise what else to test.
Your sample is stored against your company so we can track the project. Provide a company name or email as a minimum.