All pipes mentioned in this article are sold by PANDAPIPE.
What Is Black Pipe
Black pipe is usually an uncoated carbon steel pipe with a dark oxide scale formed during manufacturing. It is commonly used for gas lines, fire protection, industrial service, and structural applications. Because it is not zinc-coated, black pipe is more vulnerable to corrosion in wet environments than galvanized pipe.
It is usually made of carbon steel with a carbon content of 0.0218% to 2.11%.
What Is Black Pipe Made Of
Material Composition
Black pipe is typically made from uncoated carbon steel.
The surface appears dark due to a thin iron oxide scale formed during manufacturing, not because of any coating.
Most black pipes are produced from low to medium carbon steel grades, depending on the standard and application.
Manufacturing Types: Seamless vs Welded
Black pipe can be manufactured in two main forms:
Seamless Black Pipe
- Produced without a weld seam
- Higher pressure resistance
- Used in oil & gas, high-temperature or critical systems
Welded Black Pipe (ERW)
- Formed by rolling and welding steel strip
- More cost-effective
- Widely used in construction, fire systems, and general piping
Common Black Pipe Standards
The standards related to black pipe cover the standardization organizations or industry associations in various countries and regions. Below is a list of some common Black Pipe related standards for your reference.
Common ASTM Standards
- ASTM A252: Standard requirement for steel seamless and welded steel pipe piles.
- ASTM A500: Standard for cold-formed welded and seamless carbon steel construction pipes containing round, square, rectangular, and “special” shapes.
Common EN Standards
- EN 10219: Specifies the requirements for cold-formed welded structural pipes made of unheat-treated non-alloy steel and fine-grained steel.
- EN 10255: Standard for safety and quality of welded or threaded non-alloy steel tubes.
Common AS/ANS Standards
- AS/NZS 1074: Australian and New Zealand standard requirements for cast iron piping systems.
- AS/NZS 1163: Australia/New Zealand Standard for Cold formed hollow steel structures.
Common JIS Standards
- JIS G3444: Standard for carbon steel tubes for general construction and low pressure applications.
- JIS G3452: Standard used by the Japanese industry to regulate the manufacturing requirements of carbon steel welded pipes and seamless pipes.
The exact grade and standard should be selected based on pressure, temperature, and application requirements.
Black Pipe Dimensions
Black pipe sizes are defined by Nominal Pipe Size (NPS), which does not directly match the actual outside diameter (OD).
For example:
- NPS 2 pipe has an OD of 2.375 inches
Each pipe size includes:
- Outside Diameter (OD)
- Wall Thickness
- Inner Diameter (ID)
The size of black pipe depends on the nominal diameter and wall thickness. Among them, SCH 40, with a nominal diameter of 1/4 inch to 12 inches, is the most common.
| NPS | OD (inch) | Sch 40 Wall | Sch 80 Wall |
|---|---|---|---|
| 1/2 | 0.840 | 0.109 | 0.147 |
| 1 | 1.315 | 0.133 | 0.179 |
| 2 | 2.375 | 0.154 | 0.218 |
For full size ranges, contact us for detailed specifications.
Size table of black pipe (taking ASTM A53 Gr. B as an example)
How to Choose the Right Size and Schedule
When selecting black pipe size and schedule, consider:
- Pressure requirements
- Flow rate
- Application (gas, water, structure)
- Installation method
For example:
Schedule 40 is commonly used in gas lines and general construction, while Schedule 80 is preferred for higher pressure applications.
Black Pipe Pressure Chart
Because a pipe’s pressure capacity depends on many external factors, there’s no standardized pressure capacity table for black pipe. The pressure capacity table below estimates the theoretical maximum working pressure for Sch 40 and Sch 80 NPS pipes at room temperature (38°C/100°F). If you’re unsure about pipe selection for your project, please contact a PANDAPIPE expert for detailed information.
Black Pipe Use and Characteristics
Because of its unique characteristics, Black steel pipe has been widely used in various fields, and it has shown excellent application prospects in these fields.
Uses of Black Steel Pipe
Black pipe is commonly used in gas lines, fire protection systems, and industrial piping. To complete these systems, compatible components such as elbows, tees, and couplings are required.
You can learn more in our guide to black steel pipe fittings.
- Construction project: Black Pipe can transport drinking water and industrial water in the water supply system to ensure the normal operation of the pipeline system inside the building. In the drainage system, the effective help of sewage and waste water removal, plays a vital role in the health and cleaning of the building. On the other hand, it is also used as a frame and other structural support. Black pipe is generally not preferred for potable water or long-term wet service because it can corrode without protective coating; galvanized or other corrosion-resistant materials are often preferred depending on code and application.
- Industrial applications: Black Pipe is resistant to high temperature and pressure and is responsible for transporting fluids and gases such as water and oil. Conveying chemical raw materials in chemical industry applications. It can also support the production and processing of the manufacturing industry.
- Fire protection system: Black pipes are often used as fire water pipes in fire sprinkler systems. However, because black pipes are not corrosion-resistant, they must be treated with anti-corrosion before use.
- Boiler system: The pressure resistance of black tube is slightly poor, so it can only be used in low-pressure boiler pipes.
- Natural gas transportation: can be used for natural gas and liquefied petroleum gas transportation.
- Structural use: scaffolding, temporary support structures, guardrails, shelves, agricultural machinery frames and other structural parts in non-exposed environments.
Features of Black Pipe
The reason why black steel pipe is widely used in industrial agriculture and construction industry is very related to its performance characteristics.
First of all, the black tube has excellent corrosion resistance, and the black paint or oxidation layer on its surface can protect the steel pipe and effectively prevent the occurrence of corrosion.
Excellent high strength and compressive tensile mechanical properties make it able to carry high pressure conditions and loads, and have safety and stability in engineering projects.
Moreover, it is an environmentally friendly and healthy pipe that will not release harmful substances and can prevent pollution of water resources, soil and air in the process of production and manufacturing.
Black Pipe Conclusion
Black Pipe contains many standards, specifications and types, and its application prospects are extremely broad. It plays an important role in various fields such as modern industry and architecture, and brings important support to the development of society.
Get a Quote for Black Pipe!
Looking for black steel pipe for your project?
Tell us your required standard, size, schedule, and application. Our team will help you confirm the right specification and provide a fast quotation.
- ASTM / EN / JIS standards available
- Seamless and welded options
- Custom length, ends, and packaging
Send us your inquiry today and get a response within 24 hours.
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FAQs:
1. What is Schedule 40 black pipe used for
Schedule 40 black pipe is made of carbon steel, with good corrosion resistance and pressure resistance, very reliable and stable. It is suitable for working conditions such as building structure, industrial pipe, sewage discharge system and heating ventilation pipe system.
2. Which is stronger, galvanized pipe or black pipe
The galvanized pipe has more layers than the black pipe. The surface treatment of the galvanized layer has better corrosion resistance. But there was little difference in their ability to withstand stress.The black tube is less expensive to maintain.
Therefore, when selecting materials, comprehensive assessment can be carried out according to environmental conditions, cost and other factors.
Black Pipe vs. Galvanized Pipe: If you’d like to learn more about the key differences between these two types of pipes, click the link below for detailed information.
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