12 INCH ACTUAL SIZE ISO

12 INCH ACTUAL SIZE ISO

ISO 6708 defines the nominal size - DN - as an alphanumeric designation of size for reference purposes. ISO 6708 - Pipework components - Definition and selection of DN (nominal size) The use of NPS does not conform to American Standard pipe designations where the term NPS means 'National Pipe Thread Straight'. The metric designations conform to International Standards Organization (ISO) usage and apply to all plumbing, natural gas, heating oil, and miscellaneous piping used in buildings. The metric equivalent is called DN or 'diametre nominel'.

In plumbing pipe size is referred to as nominal pipe size - NPS, or 'Nominal Pipe Size'. For instance, a 2-inch galvanized steel pipe has an inside diameter of about 2 1/8 inches and an outside diameter of about 2 5/8 inches. Pipes are identified by 'nominal' or 'trade' names that are loosely related to the actual dimensions. The manufacturing tolerances are much tighter than in pipes.Pipes are made of a wide variety of materials - like galvanized steel, black steel, copper, cast iron, concrete, and various plastics such as ABS, PVC, CPVC, polyethylene, polybutylene and more. Tubing is measured by the exact outside diameter and the wall thickness (WT).

On the other hand, tubes are structural members and are measured with an exact outside diameter. As stated above, they are measured with nominal outside diameters using NPS and Schedule to define the pipe size. Pipes are used to transport gases or fluids. However, some process piping, utility facilities, and civil piping may require higher schedule numbers depending on the pressures used. The two most common schedule sizes seen in buildings are Schedule 40 and Schedule 80. Stainless Steel pipe schedules append an 'S' to the end of the schedule number, for instance Schedule 40S. It was originally intended for these to be phased out, but they occasionally appear. These were original terms used prior to the schedule system that was implemented in 1927. In addition to the schedule numbers, you will often see Standard (STD), Extra Strong (XS), and Double Extra Strong (XXS). The schedule number is roughly calculated as: Schedule = 1000 x (P/S) where P is the internal service pressure of the pipe (psig) and S is the ultimate tensile strength of the pipe material (psi). Wall thickness is important because it determines the amount of internal pressure that the pipe can withstand. A pipe's schedule is the thickness of the pipe wall, which directly affects the interior dimension and weight of the pipe. While the Nominal Pipe Size identifies the outside diameter of the pipe, more information is needed to identify specific pipes. The DN dimensions must conform to ISO Standard 6708. Outside of North America, pipes are identified by Diametre Nominel (DN), which is a dimensionless value that roughly equates to the outside diameter of the pipe in mm. When specific pipes are specified, the NPS, Schedule, and material are required. Nominal Pipe Sizes apply to all materials of pipe. However, from NPS 14 and above, the NPS value matches the outside diameter of the pipe.

Technically, the NPS is non-dimensional and only roughly refers to the diameter of the pipe. Nominal Pipe Size (abbreviated NPS) is a North American standard for identifying pipe sizes.

Polyvinyl Chloride (PVC) Pipe Sizes - Schedule 80.

Polyvinyl Chloride (PVC) Pipe Sizes - Schedule 40.

Stainless Steel Pipe Sizes - Schedule 80S.

Stainless Steel Pipe Sizes - Schedule 40S.

Understanding Pipe Schedule Terminology.

12 inch actual size