Hello Pipe Enthusiasts!
1. Black Steel Pipe (BSP)
BSP is a carbon steel pipe product made from Hot Rolled Coil (HRC) or Hot Rolled Plate (HRP) material, coated with temporary black varnish. This varnish covers the surface to prevent rust during storage and transportation, and can be easily removed during installation or before final coating.
- Composition and Process
- Carbon steel from hot rolled coil (HRC) or hot rolled plate (HRP)
- Black varnish coating as temporary protection
- Function of Black Varnish
- Protects against oxidation during transport and storage
- Coating is easy to clean or recoat
- Common Applications
- Non-potable water systems
- Indoor gas installations
- Steel structures installed indoors or intended for final coating
- Advantages
- More economical cost
- Smooth surface, ready for painting or final coating
- Limitations
- Long-term protection requires additional coating
- Not ideal for humid environments without further coating
2. Galvanized Steel Pipe (GSP)GSP is a carbon steel pipe product made from Hot Rolled Coil (HRC) or Hot Rolled Plate (HRP) material, coated with a permanent zinc layer through hot-dip galvanizing or electro-galvanizing. Zinc forms a durable corrosion-resistant barrier, making it suitable for applications requiring weather and moisture resistance.
- Galvanizing Method
- Hot-dip galvanizing: a metal coating method by dipping steel pipe into hot molten zinc, forming a solid zinc layer on the pipe surface
- Produces a thick and strong zinc layer that acts as an electrochemical sacrificial metal, protecting the steel by corroding the zinc first
- Common Applications
- Potable water installations
- Outdoor rainwater and drainage systems
- Projects in corrosive environments
- Advantages
- Excellent corrosion protection
- Long service life, minimal maintenance
- Limitations
- Higher cost compared to BSP
- Zinc layer may peel off if exposed to strong impact
3. BSP vs GSP Comparison Summary
|
Characteristic
|
BSP
|
GSP
|
|
Surface Protection
|
Temporary black varnish
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Permanent zinc coating
|
|
Corrosion Resistance
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Low without final coating
|
High, minimal maintenance
|
|
Common Applications
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Non-potable water, indoor gas, indoor structures
|
Potable water, drainage, corrosive environments
|
|
Price
|
More economical
|
Higher
|
By understanding the role of black varnish in BSP and galvanization in GSP, you can tailor pipe specifications to your technical needs and project budget.
