Concrete Weight Coating
Your Professional Concrete Weight Coating Supplier
Octal Pipe is a professional and integrated supplier of oilfield products and industrial steel solutions based in China. With extensive experience in supply, distribution, and manufacturing, we specialize in providing a wide range of steel materials for the oil & gas, energy, and industrial sectors.
Why Choose Us
Superior Quality Assurance
Our steel pipes undergo rigorous testing and adhere to international standards, ensuring unmatched durability, corrosion resistance, and performance in extreme conditions.
Certificates
Every product is backed by full material traceability, mill certificates, and compliance with international standards such as API, ASTM, ASME, EN, and ISO.
Competitive Pricing
We deliver premium-grade steel pipes at reasonable costs, optimizing value through efficient manufacturing and supply chain management without compromising on quality.
Fast & Reliable Delivery
Leveraging efficient sea freight logistics and a global network, we ensure timely ocean shipping of steel pipes, minimizing delays and keeping your industrial operations on schedule.
Concrete Weight Coating
Concrete weight coating (CWC) is a plant-applied reinforced concrete coating system externally applied by using either impingement or compression (wrap) method to either bare pipe or pre-coated offshore pipe with a minimum thickness of 25mm, intended primarily for submerged service for water or oil and gas pipeline system.
The objective of a concrete weight coating is to provide the required negative buoyancy to the pipeline, ensuring stability on the seabed, and/or to provide required additional mechanical protection for the pipe and its anti-corrosion coating during installation and throughout the pipeline’s operational life.
Pipeline Concrete Weight Coating CWC
| Standard | ISO 21809-5, DNV Offshore Pipeline Guidelines |
| Pipe Range | 6″ – 48″ (custom up to 60″) |
| Coating Thickness | 25 – 150 mm |
| Concrete Density | 3040 – 3500 kg/m³ |
| Reinforcement | Steel mesh, polypropylene fibers, additives |
| Coating Types | Heavy Concrete Weight Coating, Impingement CWC |
| Anode Installation | Optional sacrificial or ICCP anodes integrated for cathodic protection |
| Mechanical Benefits | Negative buoyancy, abrasion resistance, impact protection, long-term durability |
| Applications | Offshore pipelines, submarine flowlines, swamp & river crossings, landfall approaches |
Standards & Specifications
Octal Pipe manufactures CWC in accordance with international offshore pipeline standards:
● ISO 21809-5 – Concrete Weight Coatings for Pipeline Transportation Systems
● DNV-RP-F110 & DNV-OS-F101 – Offshore pipeline stability guidelines
● Pipe Size Range: 4″ – 48″ (custom up to 60″)
● Coating Thickness: 25 mm – 150 mm
● Concrete Density: 3040 – 3500 kg/m³ (adjustable per project)
● Pipe Lengths: 8 – 18 m standard, custom lengths available
Advantages of Concrete Weight Coating
Durability
Concrete is highly durable, providing long-term protection to pipelines in harsh environmental conditions.
01
Effective Weight Control
The concrete coating provides a reliable and customizable means of controlling buoyancy, particularly for offshore and subsea pipeline installations.
02
Impact Resistance
The concrete coating protects the pipe from mechanical damage, reducing the risk of damage during transportation and installation.
03
Cost-Effective Solution
Concrete is generally more cost-effective than other weight coating materials, making it a popular choice in pipeline applications where weight control is needed.
04
Protection Against Erosion
Concrete weight coatings help protect against erosion caused by waves, water currents, and other external forces, which is crucial for underwater or marine pipelines.
05
Manufacturing Processof Concrete Weight Coating
Surface Preparation:
The steel pipe is first cleaned and prepped to ensure that the concrete adheres properly. This step often involves sandblasting or shot blasting the surface of the pipe to remove any contaminants, rust, or scale.
Priming the Pipe:
A bonding agent or primer is often applied to the pipe surface to promote better adhesion between the steel and the concrete.
Concrete Application:
The concrete is applied in one of several ways:
● Spray Application: The concrete is sprayed onto the pipe surface, creating a uniform coating. This method is commonly used for large-diameter pipes.
● Tumbler or Centrifugal Method: For smaller pipes, the concrete mixture may be poured or tumbled around the pipe, using centrifugal force to apply an even coating.
Curing:
After the concrete has been applied, it is allowed to cure and harden, typically through a controlled process to ensure strength and durability. The curing time may vary depending on the concrete mix and environmental conditions.
Inspection and QualityControl:
The concrete-coated pipes undergo thorough inspection for defects, uniformity of coating, and strength. Non-destructive testing methods like ultrasonic testing or X-ray inspection may be used to ensure the integrity of the coating.
Product Properties of Concrete Weight Coated Pipe
Density
The density of the concrete used for coating typically ranges from 2,400 to 3,200 kg/m³, depending on the required weight for achieving negative buoyancy.
Thickness
The thickness of the concrete layer varies based on project specifications but generally ranges from 40 mm to 150 mm or more.
Compressive Strength
Concrete coatings exhibit high compressive strength, often exceeding 40 MPa, ensuring durability and resistance to mechanical impacts.
Adhesion
The concrete adheres well to the steel pipe, often facilitated by a mesh or wire reinforcement embedded within the concrete for added stability.
Concrete weight coated pipes come in various types and dimensions to meet specific project requirements:
Types
Standard CWC: Standard concrete weight coating applied to steel pipes.
Reinforced CWC: Concrete coating reinforced with steel mesh or wire for added strength and durability.
Lightweight CWC: Uses lighter aggregate materials to reduce overall weight while still providing necessary buoyancy control.
Dimensions
Pipe Diameter: Typically ranges from 4 inches to 48 inches or larger, depending on the application.
Concrete Thickness: Generally ranges from 40 mm to 150 mm, tailored to meet specific buoyancy and protection requirements.
Dimensions Ranges for Concrete Weight Coating Pipe
| Mother pipe standards | API 5L Grade B to Grade 80. ISO 3183 Grade L245 to L555. |
| Diameter range | 6” to 60” |
| Pipe Thickness | SCH 20, SCH 40, SCH 80 |
| Length | Up to 12 meters |
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