What does schedule 40 seamless pipe mean?

Schedule 40 seamless pipe, this keyword involves two important concepts in the steel industry: seamless pipe and schedule 40. Seamless pipe is a special kind of steel pipe, and  schedule 40 is one of the specifications of seamless pipe.

Seamless pipe

Seamless pipe/tubing is a steel pipe made by billet heating, perforation, rolling and cooling. Compared with welded steel pipes, seamless pipes have obvious advantages in appearance and performance. First of all, it has a smooth appearance and no welded joints, so it has better aesthetics. Secondly, seamless pipes excel in strength and pressure resistance and can withstand higher pressures and temperatures. This makes seamless pipes widely used in some special fields, such as petroleum, chemical, natural gas and other industries.

What is the meaning of Schedule 40 pipe?

Based on the NPS and schedule of a pipe, the pipe outside diameter (OD) and wall thickness can be obtained from reference tables such as those below, which are based on ASME standards B36.10M and B36.19M. For example, NPS 14 Sch 40 has an OD of 14 inches (360 mm) and a wall thickness of 0.437 inches (11.1 mm).Sch 40 can be used for both seamless steel pipes and ERW (Electric Resistance Welded) pipes.NPS OD Schedule # Wall Thickness ID. 1.000” 1.315” SCH 40 0.133” 1.049” (approx.) 1.000” 1.315” SCH 80 0.179” 0.957” (approx.) All pipes are specified using the NPS and schedule numbers. It is the schedule number that determines the approximate inside diameter.

Schedule 40 pipe specification mark

Schedule 40 pipe refers to a specification mark for seamless pipes, which represents the thickness of the pipe wall. Specifically, Schedule40 refers to seamless pipes with a wall thickness of 40S, where the "S" represents the standard wall thickness series. Schedule 40 is one of the common piping codes because it is moderately thick and is usually used in situations where it can withstand higher pressures and temperatures. Seamless steel pipes of this specification are widely used in petroleum, chemical industry, shipbuilding, heating and other industries.

Based on the NPS and schedule of a pipe, the pipe outside diameter (OD) and wall thickness can be obtained from reference tables such as those below, which are based on ASME standards B36.10M and B36.19M. For example, NPS 14 Sch 40 has an OD of 14 inches (360 mm) and a wall thickness of 0.437 inches (11.1 mm).

Sch 40 can be used for both Seamless steel pipes and ERW (Electric Resistance Welded) pipes.

SCH40, tube number, whether it is domestic or foreign, Sch.XX is used to indicate the wall thickness of the pipe.

Pipe wall thickness grade Sch40, carbon steel, low alloy steel of a thickness class code, corresponding to a certain pipe thickness.

Sch40: indicates tensile strength, 40 kg pressure. It can be detected through standard thickness of 4.0mm. Tubes of different diameter, different pressures, different wall thickness.

Characteristics of schedule 40 seamless pipe

Schedule 40 seamless pipe has the following characteristics:

a. High strength: Sch40 pipe wall thickness is relatively large and can withstand high pressure and mechanical load.

b. Strong corrosion resistance: Seamless steel pipes are usually made of high-quality steel and can operate stably for a long time in harsh environments.

c. High dimensional accuracy: The production process of seamless steel pipe Sch40 is relatively precise and has high dimensional accuracy, making it suitable for occasions with strict dimensional requirements.

d. Wide application: Seamless steel pipe Sch40 is widely used in petroleum, chemical industry, heating, shipbuilding and other fields, and is used to transport various media such as liquids, gases and solids.

Advantages of Schedule 40 Seamless Pipes

The combination of schedule 40 specifications and the seamless manufacturing process results in pipes that are reliable, durable, and efficient. Some of the key advantages include:

Pressure Handling: Thick walls allow these pipes to handle higher pressures compared to thinner-walled alternatives.

Versatility: Suitable for a wide range of industrial applications, from high-temperature services to structural support.

Durability: Resistant to corrosion, wear, and mechanical stress, ensuring a long service life.

Precision: The seamless manufacturing process guarantees high accuracy in dimensions and performance.

Pipes schedule 40 chart gives dimensions of steel pipes schedule 40. The chart includes sizes in inches and in millimeters.

Conclusion