How do I choose a pipe schedule?
Measure the outside diameter and the wall thickness of the pipe. Refer to the pipe schedule chart and find the outside diameter. Find the wall thickness in the corresponding column. This will reveal the nominal pipe size and the schedule.
What is the standard schedule of pipe?
The two most common schedule sizes seen in buildings are Schedule 40 and Schedule 80. However, some process piping, utility facilities, and civil piping may require higher schedule numbers depending on the pressures used.
What is NB in pipe dimension?
nominal bore
NB (nominal bore) is also frequently used interchangeably with NPS. OD is the outside diameter of the pipe and is fixed for a given size. The NPS is very loosely related to the inside diameter in inches, but only for NPS 1/8 to NPS 12. For NPS 14 and larger, the NPS is equal to the outside diameter (OD) in inches.
How is pipe NB calculated?
Nominal refers to the approximate measurement of the bore. Pipe was originally measured in inches. 100NB pipe works out to be exactly 4.5 inches (4.5(inches) x 25.4(mm/inch) = 114.3mm). That is why the outside diameter can’t be simple number like 100mm.
How big are standard pipe schedules and sizes?
Standard Pipe Schedules Pipe Sizes Chart Table Data Nom. O.D. Inches PIPE SCHEDULES WALL THICKNESS ( Inches) PIPE SCHEDULES WALL THICKNESS ( Inches) PIPE SCHEDULES WALL THICKNESS ( Inches) 5s 5 10s 10 140 1/8 .405 .035 1/4 .540 .049 3/8 .675 .049
What’s the difference between pipe NB and NPS?
Outside diameter 16 inches and below rounded to nearest 0.1 mm What is Pipe NB (Nominal Bore)? NPS is frequently referred as an NB (Nominal Bore). As such, there is no difference between NB and NPS. NB is also an American way to refer pipe dimensions. I have also seen that when pipe dimensions are shown in mm (DN) people refer pipe sizes in NB.
What is the nominal size of a pipe?
Nominal pipe size NPS is a dimensionless designator of pipe size. It indicates standard pipe size when followed by the specific size designation number without an inch symbol. For example, NPS 6 indicates a pipe whose outside diameter is 168.3 mm.
How is wall thickness expressed in a pipe Schedule?
Wall thickness is expressed in “schedules“, referred to as pipe schedules. The pipe schedule is abbreviated as SCH. For a given size and schedule the thickness of the pipe is fixed and defined in the applicable ASME standard.
