What is CWC Pipe?

CWC pipe is the abbreviation of Concrete Coated Pipe, also known as Concrete Weight Coating Pipe. It is a steel pipe coated with concrete on the outside. Concrete coatings (consisting of a mixture of cement, aggregate, steel mesh and water) can provide strong downward force protection or negative buoyancy to pipes. CWC pipes are commonly used in subsea pipelines by adding a concrete coating of appropriate weight to support the resisting pressure of seawater. Today, we will talk about CWC pipe from aspects of features, advantages and standards.

Features of CWC Pipe:

• Ensure stable pipeline performance

• Provide effective mechanical protection

• Cost Saving

• Easy to install

• Easy to operate

Advantages of CWC Pipe:

• Mechanical protection and negative buoyancy

• Anti-corrosion protection

• Excellent compatibility

• Long-term adhesion to steel

• Ideal for roll laying methods

• High resistance to cathodic stripping

• and more

Referred Standards:

DNV-OS-F101: Submarine Pipeline Systems – SAWL 245, SAWL290, SAWL 320, SAWL 360, SAWL 415, SAWL 450, SAWL 485, SAWL 555

ISO 21809-5:2010: Petroleum and natural gas industries – External coatings for buried or submerged pipelines used in pipeline transportation systems – Part 5: External concrete coatings.

• ASTM C42 Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete

• ASTM C87 Test Methods for Effect of Impurities in Fine Aggregate on Strength of Mortar BS 1881 Methods of Testing Concrete

• ASTM C642 Standard Test Method for Specific Gravity, Absorption, and Voids in Hardened Concrete

• BS 3148 Test Methods for Water for Making Concrete

• BS 4449 Material Specification for Carbon Steel Bars for Concrete Reinforcement

• BS 4482 Hard Drawn Mild Steel Wire for the Reinforcement of Concrete

• BS 4483 Specification for Steel Fabric for the Reinforcement of Concrete

• ISO 4012 Test Specimen of Determination of Compressive Strength