Applications
- Corrosive oil and gas flowlines
- Sour-service and high-CO₂ pipelines
- Offshore, subsea and process piping systems
CORROSION-RESISTANT PIPE SYSTEMS
CRA Clad & Mechanically Lined Pipe
Carbon-steel pipe combined with a corrosion-resistant alloy layer or liner for demanding transported-fluid environments.
StandardAPI 5L / ISO 3183 backing pipe · API 5LD where applicable
Size / supply rangeOD, wall, backing-pipe grade, liner thickness and length reviewed as one combination · Straight pipe and selected project components subject to qualification
Grades / materialsCarbon-steel backing pipe · 316L / 904L stainless routes
Connections / optionsWeld-end preparation · CRA weld overlay or seal-weld details
TECHNICAL PROCUREMENT
Define cra clad & mechanically lined pipe around the operating requirement.
Availability and final supply scope are confirmed after technical review. OAK PIPE coordinates the product configuration, manufacturing route, inspection requirements and delivery package against the enquiry.
Configuration options
- Metallurgically clad or mechanically lined construction
- Stainless steel and nickel-alloy corrosion-resistant layers
- Seamless, welded, bend and spool-compatible supply routes
Quality & documentation
- Base-pipe and CRA material verification
- Bond, liner-fit, weld-overlay and interface inspection as applicable
- Corrosion testing, NDT, hydrostatic testing and project dossier
PROCUREMENT BASIS
Technical scope at a glance.
This summary supports preliminary comparison. Final dimensions, tolerances, availability and acceptance requirements are confirmed against the enquiry and governing purchase documents.
| Reference basis | API 5L / ISO 3183 base pipe with applicable ASTM, DNV or project-specific CRA cladding and lining requirements |
|---|---|
| Product configuration | Metallurgically clad or mechanically lined construction · Stainless steel and nickel-alloy corrosion-resistant layers · Seamless, welded, bend and spool-compatible supply routes |
| Verification basis | Base-pipe and CRA material verification · Bond, liner-fit, weld-overlay and interface inspection as applicable · Corrosion testing, NDT, hydrostatic testing and project dossier |
| Commercial confirmation | Size or drawing · Material / grade · Quantity · Service conditions · Inspection scope · Destination and schedule |
The purchase order, approved drawings and agreed specification take precedence over this website summary.
RFQ CHECKLIST
Information to include with your enquiry.
A clear starting specification allows faster technical review and a more accurate commercial response.
Prepare Your RFQ- 01Base-pipe diameter, wall, grade, length and quantity
- 02CRA alloy, layer thickness and construction method
- 03Design pressure, temperature and fluid chemistry
- 04Qualification, corrosion test, NDT and end-preparation requirements
PRODUCT OVERVIEW
CRA Clad & Mechanically Lined Pipe for project-specific requirements.
CRA clad and mechanically lined pipe combine the structural strength of carbon-steel backing pipe with a corrosion-resistant alloy layer or liner. They are considered for transported fluids containing CO2, H2S, chlorides or other corrosive constituents where solid CRA pipe may not be the preferred commercial or engineering route.
Clad and lined constructions have different manufacturing, interface and end-preparation requirements. Selection must consider backing-pipe grade, CRA alloy, metallurgical bond or mechanical fit, liner thickness, welding procedure, seal welds, end overlay, pressure, temperature, installation method and project qualification.
OAK coordinates the product as an engineered package with order-specific manufacturing procedures, qualification tests, NDT, dimensional control, corrosion testing and documentation.
TECHNICAL SCOPE
Supply basis at a glance.
Use this overview to prepare an enquiry. The final size, grade, connection and inspection combination is confirmed against the governing specification.
| Technical field | Available or review basis |
|---|---|
| Standards | API 5L / ISO 3183 backing pipe · API 5LD where applicable · ASTM CRA material standards · DNV and project-specific clad or lined-pipe requirements |
| Size & supply range | OD, wall, backing-pipe grade, liner thickness and length reviewed as one combination · Straight pipe and selected project components subject to qualification |
| Grades & materials | Carbon-steel backing pipe · 316L / 904L stainless routes · Duplex / super-duplex · Alloy 825 / 625 and selected nickel alloys |
| Connections & options | Weld-end preparation · CRA weld overlay or seal-weld details · Field-welding interface and liner restraint by project design |
PRODUCT PARAMETERS
Recorded product specifications.
The values below come from the maintained OAK product record. Contract dimensions, tolerances and acceptance criteria remain subject to final order review.
| Parameter | Specification / value |
|---|---|
| Construction routes | Metallurgically clad or mechanically lined pipe |
| Backing pipe | Carbon-steel line pipe selected to project structural requirements |
| CRA layer | Stainless, duplex or nickel-alloy systems subject to corrosion review |
APPLICATIONS
Where this product is used.
- Sour and corrosive production fluids
- Subsea flowlines and risers
- Corrosive gathering systems
- Process and injection lines
SERVICE & SELECTION
Conditions considered during selection.
- CO2 / H2S corrosion
- Chlorides and produced water
- High pressure and temperature
- Reeling, bending or installation strain where applicable
MANUFACTURING
Controlled production route.
Key operations are coordinated against the product specification and order requirements.
01Backing-pipe and CRA material control
02Cladding or liner insertion and expansion route
03Interface and end-overlay preparation
04Heat treatment where applicable
05Qualification, NDT and dimensional control
06Final pressure test and preservation
INSPECTION & TESTING
Verification before release.
- Backing-pipe and CRA PMI
- Bond or interface examination
- UT and other NDT according to construction
- Hydrostatic testing
- Corrosion and qualification testing
- Dimensional and end inspection
QUALITY DOCUMENTS
Evidence supplied with the order.
- Backing-pipe and CRA MTCs
- Manufacturing and qualification procedures
- NDT and hydrostatic-test reports
- Corrosion-test results
- End-overlay and welding records
- Project manufacturing record book
PACKING & DELIVERY
Prepared for the destination and handling plan.
Marking, protection and shipment details are confirmed during order review.
Internal cleanliness and preservation
End sealing and protection
Handling controls preventing liner or coating damage
Project shipment plan
RFQ CHECKLIST
Information needed for a practical quotation.
Share the available technical and commercial requirements. Missing details can be reviewed with our team.
Request a Quote- 01Design standard and service fluid composition
- 02Pressure, temperature and corrosion allowance
- 03OD, backing wall, grade and quantity
- 04CRA alloy and required layer thickness
- 05Construction route, end detail and installation method
- 06Qualification, inspection and documentation requirements
PRODUCT & PROCESS VIEWS
Product views and manufacturing context.
Representative product, production and inventory views support preliminary identification. Final supply details are confirmed against the quotation.
START A CONVERSATION
Have a specification or product list?
Send it to OAK PIPE for technical and commercial review.