NB Pipe Size Chart – Nominal Bore Pipe Dimensions & Schedule Chart

The NB Pipe Size Chart by CeraPure Steel provides complete details of nominal bore pipe dimensions, outside diameter, wall thickness, schedules, and pipe weights used in industrial piping systems. NB (Nominal Bore) is a standard designation used for pipe sizing in industries such as oil & gas, pharmaceutical, dairy, chemical processing, power plants, and construction.

NB pipe sizes are commonly available in schedules like SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160, and XXS depending on pressure and application requirements.

What is NB in Pipe Size?

NB stands for Nominal Bore, which indicates the approximate internal diameter of a pipe. It is commonly expressed in inches and millimeters for international piping standards.

For example:

• 15 NB = 1/2 inch pipe
• 25 NB = 1 inch pipe
• 50 NB = 2 inch pipe

NB sizes are widely used in stainless steel pipes, carbon steel pipes, seamless pipes, welded pipes, and industrial tube systems.

Nominal Bore Pipe Formula

Pipe wall thickness and schedule are related to pressure handling capability.

Higher Schedule⇒Higher Wall Thickness\text{Higher Schedule} \Rightarrow \text{Higher Wall Thickness}Higher Schedule⇒Higher Wall Thickness

Thicker pipe walls provide better strength and pressure resistance for industrial applications.

NB Pipe Size Chart in MM & Inches

NB Pipe Schedule Chart

Nominal Bore Pipe Dimensions

NB Pipe Weight Formula

The weight of a pipe can be calculated using the following standard formula:

Weight (kg/m)=0.02466×(OD−WT)×WT\text{Weight (kg/m)} = 0.02466 \times (OD – WT) \times WTWeight (kg/m)=0.02466×(OD−WT)×WT

Where:

• OD = Outside Diameter
• WT = Wall Thickness

This formula is widely used in stainless steel and mild steel pipe calculations.

NB Pipe Weight Chart

DN to NPS Conversion Chart

Types of NB Pipes

Stainless Steel NB Pipes

Used in pharmaceutical, food processing, and corrosive environments.

Carbon Steel NB Pipes

Suitable for structural and industrial applications.

Seamless NB Pipes

Manufactured without welding joints for high-pressure systems.

Welded NB Pipes

Cost-effective pipes used in general industrial applications.

ERW Pipes

Electric Resistance Welded pipes widely used in water and utility systems.

Applications of NB Pipes

Oil & Gas Industry

Used for fluid transportation and pressure systems.

Pharmaceutical Industry

Suitable for hygienic stainless steel piping systems.

Dairy & Food Processing

Used in sanitary process lines and fluid transfer systems.

Power Plants

Applied in steam and high-temperature piping.

Chemical Industry

Resistant to corrosion and chemical exposure.

Construction Industry

Used in fabrication and infrastructure projects.

Advantages of Using Standard NB Pipe Sizes

• Easy pipe identification
• International standard compatibility
• Accurate pressure calculations
• Better fitting compatibility
• Simplified engineering design
• Improved maintenance and replacement
• Cost-effective inventory management

Stainless Steel Pipe Standards

Industries Using NB Pipe Charts

• Petrochemical Plants
• Dairy Processing Units
• Pharmaceutical Plants
• Food & Beverage Industry
• Chemical Plants
• Fertilizer Plants
• Water Treatment Plants
• Shipbuilding Industry
• Power Generation Plants

Countries We Supply NB Pipes

CeraPure Steel supplies pipes and piping solutions globally including:

• India
• UAE
• Saudi Arabia
• Oman
• Qatar
• Kuwait
• Singapore
• United States
• United Kingdom
• Germany
• Australia
• South Africa

Conclusion

The NB Pipe Size Chart by CeraPure Steel helps engineers, fabricators, contractors, and industrial buyers select accurate nominal bore pipe dimensions for industrial applications. Understanding NB sizes, schedules, wall thicknesses, and pipe weights is essential for designing reliable piping systems with proper pressure handling and long-term performance.

CeraPure Steel offers high-quality stainless steel pipes, seamless pipes, welded pipes, sanitary tubing, and industrial piping products for global industries.