1. **Is 20mm pipe 3/4 inch?**
No, 20mm pipe is not exactly 3/4 inch. 20mm is approximately 0.787 inches, while 3/4 inch is 0.75 inches (or 19.05mm). Although they are close in size, they are not interchangeable in precise applications. In some metric systems, 20mm pipe may be used as a rough equivalent, but it does not match the standard imperial 3/4 inch size.
2. **What is the strongest pipe schedule?**
The strength of a pipe schedule depends on the material and application, but generally, Schedule 160 or XXS (Double Extra Strong) are considered the strongest standard schedules for steel pipes. These schedules have the thickest walls and highest pressure ratings, making them suitable for high-stress environments. However, for specific materials like PVC, Schedule 80 may be stronger than Schedule 40.
3. **Which pipe has the longest lifespan?**
The lifespan of a pipe depends on factors like material, installation, and environmental conditions. Pipes made from materials such as stainless steel, copper, or HDPE (High-Density Polyethylene) often have the longest lifespans, typically exceeding 50 years when properly maintained. For example, HDPE is highly resistant to corrosion and chemicals, while stainless steel offers durability in harsh conditions. The actual lifespan can vary based on usage and maintenance.
4. **What is NB in pipe?**
NB in pipe stands for "Nominal Bore," which refers to the approximate internal diameter of the pipe. It is a standard sizing term used primarily in metric systems to identify pipe sizes. For instance, a pipe labeled NB 100 has a nominal internal diameter of 100mm. NB is similar to NPS (Nominal Pipe Size) in imperial units, but NPS is based on inches.
5. **Which pipe is stronger, SDR 35 or Schedule 40?**
Schedule 40 pipe is generally stronger than SDR 35 pipe for the same material (e.g., PVC). Schedule 40 has a thicker wall and a higher pressure rating, making it suitable for higher-stress applications. SDR 35, which stands for Standard Dimension Ratio, has a thinner wall relative to its diameter and is typically used for low-pressure drainage or sewer systems. Therefore, Schedule 40 is stronger in terms of structural integrity and pressure handling.
