Marine pipe
High-Quality Marine Pipes for Demanding Applications
Marine pipes are essential components in shipbuilding and offshore operations, designed to withstand harsh marine environments. Our marine pipes meet international standards and certifications for superior performance in challenging conditions.
Product Specifications
- Material: High-grade stainless steel (316L, 304L), carbon steel, duplex steel
- Diameter Range: 1/2" to 48" (DN15 to DN1200)
- Wall Thickness: SCH 10S to SCH XXS
- Pressure Rating: Up to 5000 PSI
- Temperature Range: -40°F to 1200°F (-40°C to 650°C)
- Certifications: ABS, DNV, LR, BV, CCS, KR, RINA approved
| Pipe Type | Material Grade | Corrosion Resistance | Typical Applications |
|---|---|---|---|
| Seamless Marine Pipe | 316L, 904L | Excellent | Seawater systems, fuel lines |
| Welded Marine Pipe | 304L, 316Ti | Good to Excellent | Ballast systems, exhaust |
| Duplex Pipe | 2205, 2507 | Superior | Riser systems, high-pressure |
Marine Pipe FAQs
Q: What makes marine pipes different from standard industrial pipes?
A: Marine pipes undergo rigorous testing for saltwater corrosion resistance, impact strength, and fire resistance. They are manufactured to specific classification society standards (ABS, DNV, etc.) with full traceability requirements. Standard industrial pipes don't meet these stringent marine environment requirements.
Technical Advantages
- Precision-engineered for uniform wall thickness
- Superior mechanical properties in low temperatures
- Excellent weldability and formability
- Resistant to pitting, crevice corrosion, and stress cracking
- Third-party inspected and certified
| Standard | Description | Application |
|---|---|---|
| ASTM A312 | Seamless, welded stainless steel pipe | General marine applications |
| ASTM A790 | Duplex stainless steel pipe | High-pressure systems |
| API 5L | Line pipe specification | Offshore pipelines |
Q: How often should marine pipes be inspected?
A: Classification societies typically require annual external inspections and internal inspections every 2-5 years depending on service. Critical systems like fuel lines or seawater cooling pipes may need more frequent checks. Ultrasonic thickness testing is recommended every 3 years for pipes in corrosive services.
Installation Guidelines
- Proper support spacing (typically 1.5-3m depending on diameter)
- Use compatible gaskets and flange materials
- Avoid galvanic corrosion by isolating dissimilar metals
- Follow classification society welding procedures
- Pressure test according to system requirements
Q: Can marine pipes be repaired if damaged?
A: Minor damage can often be repaired by qualified marine pipe specialists using approved procedures. Small dents (less than 10% of diameter) may be acceptable if not affecting structural integrity. Corroded sections typically require cutting out and replacement with certified welded joints. All repairs must be documented and may require classification society approval depending on the system criticality.
Ordering Information
When ordering marine pipes, please specify:
- Pipe diameter and schedule/wall thickness
- Material grade and certification requirements
- End preparation (beveled, plain end, threaded)
- Required testing (hydrostatic, NDT, etc.)
- Surface treatment requirements
Our marine pipes are available with quick delivery from stock or can be custom manufactured to your exact specifications.