Carbon Steel ERW Boiler Tube & Air Heater Tube Specification

Carbon steel ERW (Electric Resistance Welded) boiler tubes and air heater tubes are specialized pipes used in various industrial applications, particularly in the construction of boilers and air preheaters in power plants. These tubes are designed to withstand high temperatures and pressures. Here are some of the specifications that are commonly referenced for these types of tubes:

### boiler tubes

**ASTM A178**

- **Description**: This standard covers electric-resistance-welded tubes for use as boiler tubes, superheater tubes, and heat-exchanger tubes.

- **Grades**: Three grades are available: A, B, and C, each with different chemical and mechanical property requirements.

- ** Sizes**: Generally available in sizes up to 5 inches in outside diameter.

**ASTM A192**

- **Description**: This standard specifies seamless carbon steel boiler tubes for high-pressure service.

- **Grades**: It typically comes in one grade, with specific requirements for composition and tensile properties.

**ASTM A210**

- **Description**: This standard covers seamless medium-carbon steel boiler tubes for use in the production of high-pressure and high-temperature steam boilers.

- **Grades**: Two grades are covered, A and C, with Grade A having higher tensile strength.

### Air Heater Tubes

**ASTM A214**

- **Description**: This standard covers minimum-wall-thickness, electric-resistance-welded, carbon steel tubes for use in high-temperature service in superheaters, reheaters, and other service in which flue gases are present.

- **Grades**: Three grades are specified: Grade A, Grade C, and Grade D, with Grade C being the most commonly used for air heater applications.

**ASTM A556**

- **Description**: This standard specifies carbon steel tubes for use in air heaters and similar applications.

- **Grades**: There is only one grade specified under this standard.

### General Specifications for Both

- **Outside Diameter (OD)**: The tubes are available in various outside diameters, depending on the specific standard and grade.

- **Wall Thickness**: The wall thickness can vary and is often specified in terms of schedule numbers, such as Schedule 40, Schedule 80, etc.

- **Length**: Tubes are typically supplied in standard lengths (e.g., 20 feet), but custom lengths can also be ordered.

- **End Finish**: The ends of the tubes may be plain or beveled for welding, depending on the application.

- **Surface Finish**: The tubes may have a smooth finish or may require additional treatments such as pickling and passivation for use in corrosion-resistant environments.

- **Testing**: The standards often require hydrostatic testing, non-destructive testing (NDT), and other quality checks to ensure the tubes meet the necessary mechanical and pressure requirements.

When selecting carbon steel ERW boiler tubes or air heater tubes, it is crucial to consider the operating conditions, including the temperature and pressure the tubes will be subjected to, as well as the specific requirements of the application. Always consult the applicable standards for the most up-to-date and detailed specifications.