Pipe schedules and pressure ratings can be confusing when you’re ordering materials or reviewing drawings. Here’s a simple overview of what they mean and why they matter for your project.
Schedule (e.g. Sch 40, Sch 80) refers to wall thickness for a given nominal pipe size. Higher schedule numbers generally mean thicker walls and higher pressure capacity. For example, Schedule 80 has a thicker wall than Schedule 40 for the same nominal diameter. Design codes and process requirements usually specify the schedule or minimum wall thickness, so it’s important to order exactly what’s specified. Using a lighter schedule than required can be unsafe; using a heavier one may be unnecessary and more expensive. Your supplier can help you match the schedule to your design pressure and material.
Pressure rating (e.g. PN, class) indicates the maximum pressure the pipe or fitting is designed to handle at a given temperature. Ratings depend on material, dimensions, and the standard under which the product is made. Always ensure that the pipe and fittings you use are rated for your design conditions. Mixing components with different ratings or using products beyond their rating can lead to failure. When in doubt, share your design pressure and temperature with your supplier so they can confirm that the proposed products are suitable.
ASTO PIPES supplies pipes and fittings with clear specifications and documentation. We can help you interpret schedules and pressure ratings for your application and ensure you get the right product for your project. Contact us for technical support and quotes.
ASTO PIPES supplies quality pipes and tubing for industrial, plumbing, and construction. For specifications, quotes, or delivery, contact us at info@astopipes.com.
