OFFSHORE STRUCTURE PIPE
Offshore Project
Offshore Structural Pipe
Offshore platform is the equipment to drill and extract oil from the sea. Based on different functions, offshore platform can be classified as drilling platform, production platform, service platform, oil storage, etc. There are bottom-supported, gravity, jack-up, semi-submersible, tension leg type, etc. According to different function, Pile foundation type, bottom-supported and gravity platform are used in shallow waters. Jack-up, semi-submersible, tension leg type, such as vertical cylinder type of offshore platform become the hotspot in the field of ocean engineering.
We has developed the offshore structural pipes for offshore platform, supplied in normalized or quenched and tempered condition for yield strength 355~690 MPa.
– Bracing pipe
– Chord pipe
Jack-up drilling platform leg chord pipe is manufactured as with semicircle.
Its advantage is low cost and high efficiency that producing semicircle pipe with seamless pipe through longitudinal cutting process.
Characteristics of we products
– Steel design with low carbon and micro alloyed
– Low carbon equivalent
– Excellent weldability
– Excellent low temperature toughness
– Lower ductile brittle transition
– Higher surface quality
Reference Standards
API SPEC 5L Specification for Line Pipe
EN 10210-1 Hot finished structural hollow sections of non-alloy and fine grain steels – Part 1:
Technical delivery conditions.
EN 10210-2 Hot finished structural hollow sections of non-alloy and fine grain steels – Part 2:
Tolerances, dimensions and sectional properties.
EN 10225 Weldable structural steels for fixed offshore structures – Technical delivery conditions
ABS RULES Material and Welding 2015 Part 2
ABS RULES Building and Classing Mobile Offshore Drilling units 2015 Part 3
DNV-OS-B101
Grades of Pipes for Offshore Structures
Size range
Platform Type and Corresponding Pipe Sizes and Grades
Mechanical Properties
Performance Data as per EN 10225
note:t = wall thickness
Performance Data as per API SPEC 5L
note:t = wall thickness
Chemical Composition (%, API Spec 5L)
other technical requirement as per API SPEC 5L and Customer’s requirement.
Customer Weldability
X80Q Weldability test
X100Q Weldability
Currently, products from X70Q to X100Q have passed weldability evaluation by Singapore Keppel.
Ductile Brittle Transition
Conclusion: The impact toughness of the product is good. The temperature of ductile-to-brittle transition is lower than -40°C for X100Q and -80°C for X80Q. Therefore, they are safer when used in low-temperature environments.
Manufacturing Statistics X80Q – X100Q
Production Statistics X80Q
Production Statistics X100Q
Certification of Offshore Structural Pipe
Construction Site Pictures
Supply Record of Jack-up Drilling Platform Pipe
Choke & kill, Boost Pipe
Choke & Kill, Boost pipe should be produced in accordance with ASTM A519 and A370, latest editions. API 16C and API spec 5L shall be used as a reference only. Material shall comply with NACE MR-01-75(ISO 15156-2).
Chemical Composition as per 4130 of ASTM A 519
Mechanical Property
Manufacturing Statistics
