ANSI B36.10M Seamless Steel Pipe

ANSI B36.10M is a standardized steel pipe dimension system widely used in industry, covering a wide range of sizes and wall thicknesses to meet the needs of diverse applications. This article provides a detailed overview of seamless pipe dimensions under the ANSI B36.10M standard to help readers better understand and select appropriate steel pipe products.

ANSI B36.10M Standard

ANSI B36.10M is a dimensional standard for steel pipe and fittings established by the American Society of Mechanical Engineers (ASME). It specifies parameters such as the outer diameter, wall thickness, and corresponding dimensional tolerances for seamless steel pipe. This standard is widely used in industries such as petroleum, natural gas, chemicals, power generation, and machinery manufacturing, and serves as a crucial basis for ensuring the quality and interchangeability of steel pipe products.

ANSI B36.10M Seamless Steel Pipe Outer Diameter

1. Units and Notation

The outside diameter of seamless steel pipe in the ANSI B36.10M standard is typically expressed in inches and expressed as either Nominal Pipe Size (NPS) or Nominal Diameter (DN).

NPS is a numerical value corresponding to the actual outside diameter of the steel pipe, while DN is a pipe diameter designation defined by the International Organization for Standardization (ISO). In the ANSI B36.10M standard, there is a certain correspondence between NPS and DN, but they are not completely equivalent.

2. Size Range

The outside diameter of seamless steel pipe in the ANSI B36.10M standard covers a wide range, from 1/8 inch (3.175 mm) to 24 inches (609.6 mm).

Each NPS or DN value corresponds to a specific outside diameter:

NPS 1/2 (DN 15) → OD 21.34 mm

NPS 2 (DN 50) → OD 60.3 mm

3. Dimensional Tolerances

The outside diameter dimensions of seamless steel pipes specified in the ANSI B36.10M standard have certain tolerances to ensure interchangeability between pipes produced by different manufacturers.

These tolerances typically vary based on the wall thickness and size of the pipe and are generally controlled within a range of ±0.5% to ±1%.

Wall Thickness of Seamless Steel Pipes in ANSI B36.10M

1. Units and Notation

The wall thickness dimensions of seamless steel pipes in the ANSI B36.10M standard are also expressed in inches and are indicated by different wall thickness grades. These wall thickness grades include Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD (i.e., Sch40), Sch60, Sch80s, XS (i.e., Sch80), Sch100, Sch120, and Sch140.

2. Wall Thickness Range

Each wall thickness grade corresponds to a specific wall thickness range, which is typically determined based on the outer diameter of the steel pipe. As the NPS or DN value increases, the corresponding wall thickness for the same wall thickness grade also increases. For example:

NPS 1/2 (DN 15):

Sch20 → 2.77 mm

Sch40 → 3.73 mm

NPS 2 (DN 50):

Sch20 → 2.87 mm

Sch40 → 3.91 mm

3. Dimensional Tolerances

In the ANSI B36.10M standard, the wall thickness of seamless steel pipe also has a certain tolerance range.

Other Dimensional Parameters of Seamless Steel Pipe in ANSI B36.10M

In addition to outer diameter and wall thickness, the ANSI B36.10M standard also specifies other dimensional parameters of seamless steel pipe, such as length, curvature, and ovality.

1. ANSI B36.10M Seamless Steel Pipe Length

Seamless steel pipes specified in the ANSI B36.10M standard typically come in fixed lengths, such as 20 feet (6.1 meters) or 40 feet (12.2 meters).

Custom lengths are also available based on specific customer requirements.

2. ANSI B36.10M Seamless Steel Pipe Curvature

The ANSI B36.10M standard specifies the permissible curvature range for seamless steel pipes, which must not exceed 1.5 mm per meter to avoid compromising installation and sealing.

3. ANSI B36.10M Seamless Steel Pipe Ovality

The ANSI B36.10M standard also specifies the permissible ovality range for seamless steel pipes, limiting the difference between the maximum and minimum cross-sectional diameters to ensure the cross-sectional shape of the pipe meets design requirements.

ANSI Seamless Pipe Dimensions Chart (ANSI B36.10, B36.19M)

Applications of ANSI B36.10M Seamless Steel Pipe

1. Oil and Gas Industry

Corrosion-resistant seamless steel pipe can be used in oil and gas pipelines, which must withstand high pressure and corrosive environments.

2. Chemical Industry

High-grade alloy steel seamless pipe is often used for transporting various corrosive media such as acids, alkalis, and salts.

3. Power Industry

Used in the power industry for manufacturing equipment such as boilers and heat exchangers, and for transporting high-temperature and high-pressure steam.

4. Machinery Manufacturing Industry

Used in the machinery manufacturing industry for manufacturing various mechanical parts and structural components, such as bearings, cylinders, and hydraulic cylinders.

5. Other Industries

Widely used in the construction, shipbuilding, aerospace, and other fields, it is used to manufacture various structural components and parts.

FAQ

1. ANSI B36.10M vs. ANSI B36.19M?

B36.10M → Used for carbon steel pipe and alloy steel pipes, with a wide range of wall thickness grades (Sch10 to Sch160). B36.19M → Specially applies to stainless steel pipe with lighter wall thickness grades (commonly seen in Sch5s, Sch10s, Sch40s, and Sch80s).

When selecting, consider the material and operating conditions.

2. ANSI B36.10M vs. ASTM Seamless Steel Pipe?

ANSI/ASME B36.10M → Standardizes steel pipe dimensions (OD, wall thickness, NPS).

ASTM (such as ASTM A106, A53, and A333) → Standardizes the material, chemical composition, and mechanical properties of steel pipe.

In actual procurement, the ANSI B36.10M dimensional standard and ASTM material standards are often combined.

Summary

ANSI B36.10M is an internationally recognized American standard for steel pipe. Seamless steel pipe under the ANSI B36.10M standard covers a wide range of sizes and offers excellent mechanical properties and interchangeability. When purchasing, you need to comprehensively consider factors such as specific application scenarios, material selection, manufacturer reputation, price factors, delivery time and service to ensure that you choose the right steel pipe product.