How to Choose SS Pipe Size – Tips Based on Use Case

Selecting the correct stainless steel (SS) pipe size is important to ensure safety, performance, and durability in any application. Whether for plumbing, industrial use, food processing, or high-pressure pipelines, choosing the right size depends on several factors such as pressure, schedule thickness, and material grade (like 304 or 316).

1. Understand the Basics of SS Pipe Sizing

SS pipe sizes are usually defined using two parameters:

• Nominal Bore (NB): This refers to the internal diameter (ID) of the pipe.
• Schedule: This indicates the wall thickness. Common schedules include 5S, 10S, 40S, 80S.

For example, a 1-inch NB pipe with Schedule 10S has a different thickness than one with Schedule 40S.

2. Choosing Based on Pressure Requirements

If your pipeline must handle high pressure, you should opt for a pipe with a thicker wall (higher schedule). For instance:

• Low-pressure systems: Schedule 5S or 10S
• Medium-pressure systems: Schedule 40S
• High-pressure systems: Schedule 80S or above

3. Material Grade – 304 vs 316

Both 304 and 316 stainless steel are corrosion-resistant but serve different needs:

• SS 304: General use, cost-effective, suitable for indoor and mild corrosion environments.
• SS 316: Superior corrosion resistance due to added molybdenum; ideal for marine, food-grade, and chemical industries.

4. Application-Based Size Selection

5. Tips for Bulk Orders or Commercial Projects

• Check availability of schedule-wise sizes before placing orders
• Always request a mill test certificate (MTC) from suppliers
• Match pipe schedule with flange and fittings specs
• Ask for per meter and per KG pricing to compare total cost

Need More Help?

If you are unsure, consult your mechanical or piping engineer or contact a supplier for assistance. Matching the correct pipe to your need saves long-term costs and avoids maintenance issues.

Related Pages

• SS 304 Pipe
• SS Pipe Schedule
• SS Pipe Wholesale