ASTM A252 Pipe Dimensions And Specifications

ASTM A252 specifies the requirements for welded and seamless steel pipes used for piling purposes. The standard outlines various dimensions, specifications, and applicable tolerances to ensure the pipes' structural integrity and suitability for different applications. Below are the key dimensions and specifications related to ASTM A252 pipes:

Pipe Dimensions

ASTM A252 pipes are available in a range of sizes. The standard provides guidelines for the following dimensions:

1. Nominal Pipe Sizes (NPS):

• The nominal pipe sizes typically range from 6 inches (NPS 6) to 60 inches (NPS 60). However, the most common sizes used in practice are between 10 inches and 36 inches.

2. Wall Thickness:

• The wall thickness of ASTM A252 pipes varies depending on the nominal size and the specific requirements of the project. The standard does not specify fixed wall thicknesses but allows for custom thicknesses based on engineering needs.

• Generally, wall thicknesses can range from 0.250 inches to 0.500 inches or more, depending on the application and the loading conditions.

3. Outside Diameter (OD):

• The outside diameter of the pipes corresponds to the nominal pipe size. For example, an NPS 6 pipe typically has an OD of 6.625 inches, while an NPS 60 pipe has an OD of 60.000 inches.

4. Length:

• ASTM A252 pipes can be produced in various lengths, commonly ranging from 20 feet to 40 feet. However, custom lengths can be manufactured based on specific project requirements.

Specifications

ASTM A252 provides detailed specifications regarding the material properties, manufacturing processes, and testing requirements for the pipes:

1. Material Grades:

• Grade 1: Minimum yield strength of 35,000 psi (241 MPa)

• Grade 2: Minimum yield strength of 42,000 psi (290 MPa)

• Grade 3: Minimum yield strength of 50,000 psi (345 MPa)

• As per ASTM A252, the pipes are classified into three grades based on their yield strength:

2. Chemical Composition:

• The steel used in ASTM A252 pipes must meet specific chemical composition standards, including limits on carbon, manganese, phosphorus, sulfur, and silicon. For example, the carbon content in the steel typically should not exceed 0.25%.

3. Mechanical Properties:

• The standard specifies minimum tensile strength, elongation, and Charpy impact toughness for the different grades of pipes, ensuring that they can withstand the required loads and environmental conditions.

4. Weldability:

• The pipes must have good weldability, and the welding processes used in the manufacturing should adhere to applicable standards to ensure the quality of the weld joints.

5. Testing Requirements:

• Non-destructive testing (NDT) to check for internal and external flaws.

• Mechanical testing to verify tensile strength, yield strength, and elongation.

• Dimensional checks to ensure compliance with the specified tolerances and dimensions.

• Pipes must undergo various tests, including:

Tolerances

ASTM A252 outlines acceptable tolerances for the dimensions of the pipes, which are crucial for ensuring proper fit and performance in construction applications. Tolerances typically cover:

• Outside Diameter: A tolerance is generally ±1/8 inch for pipes up to 12 inches in diameter and ±1/4 inch for larger sizes.

• Wall Thickness: Tolerances for wall thickness are usually ±10% of the nominal thickness.

• Length: A tolerance of ±2 inches is commonly accepted for the length of the pipes.