**1. What is the wall thickness of Schedule 40 steel pipe?**
The wall thickness for Schedule 40 pipe is not a single value; it varies significantly with the nominal pipe size (NPS). For example, Schedule 40 for a 1-inch NPS pipe has a wall thickness of 3.38 mm (0.133 inches), while for a 12-inch NPS pipe, it is 9.53 mm (0.375 inches).
**2. What is the actual outside diameter of an 8 inch 200 mm steel pipe?**
The actual outside diameter (OD) of an 8-inch nominal pipe is 219.1 mm. This is because the 8-inch NPS designation corresponds directly to the metric DN 200 (Diamètre Nominal) size, and both have a standardized outside diameter of 219.1 millimeters.
**3. What is the wall thickness of 12 steel pipe?**
Assuming "12 steel pipe" refers to a 12-inch Nominal Pipe Size (NPS) with the common Schedule 40, the wall thickness is 9.53 mm (0.375 inches). For other schedules, the thickness would be different (e.g., Schedule 80 is 17.48 mm).
**4. What is the thickness of 250 mm pipe?**
A 250 mm pipe refers to the metric DN 250 size, which corresponds to a 10-inch NPS pipe. For the standard Schedule 40, the wall thickness is 9.27 mm (0.365 inches). The thickness would be greater for schedules like 80 or 160.
**5. What is the standard thickness of outer walls in MM?**
The term "outer walls" is not standard. If you are referring to the wall thickness of standard steel pipes, there is no single value. The most common standard is Schedule 40, whose wall thickness in millimeters ranges from approximately 2.77 mm for a ½-inch pipe to over 12.7 mm for larger pipes (e.g., 18-inch NPS Schedule 40 is 12.7 mm thick).
