Marine Umbilical Tubing

Marine Umbilical Tubing Solution

BAOFENG provides long-length seamless stainless steel and special alloy coiled tubing for marine umbilical systems used in offshore and subsea oil & gas production.

The tubing can serve as hydraulic control and chemical injection lines within subsea umbilical systems, supporting long-distance connection between surface facilities and subsea production equipment while reducing intermediate joints and potential leakage points.

What Is a Marine Umbilical?

A subsea umbilical connects surface facilities with subsea production systems and integrates multiple functions into a single system.

Typical functions include:

• Hydraulic power transmission
• Chemical injection
• Control signal transmission
• Data transmission
• Support for subsea production equipment

BAOFENG’s technical materials identify marine umbilicals as a key component of deepwater oil & gas development, connecting surface facilities with subsea production systems.

Why Long-Length Seamless Tubing?

Tubing inside an umbilical may run for long distances between offshore facilities and subsea equipment.

Using long continuous seamless tubing helps reduce:

• Intermediate tube joints
• Potential leakage points
• Field connection work
• Installation complexity
• Maintenance exposure

For suitable specifications, BAOFENG seamless coiled tubing can be supplied in continuous lengths reaching approximately 3,000 metres and beyond depending on size and project requirements.

Tubing Size Capability

BAOFENG’s standard seamless coiled tubing capability includes:

• Outside Diameter: 3–38 mm
• Wall Thickness: 0.5–4 mm

Typical standard continuous lengths include:

• OD 3–14 mm: up to 3,000 m
• OD 16–19 mm: around 250 m
• OD 25–38 mm: around 150 m

Other sizes and lengths can be developed according to project requirements.

Material Options

Material selection for marine umbilical tubing depends on seawater exposure, chloride concentration, operating pressure, temperature and chemical service.

BAOFENG’s coiled tubing material portfolio includes:

• 304 / 304L
• 316 / 316L
• 317L
• 904L
• 6Mo
• Duplex 2205
• Super Duplex 2507
• Alloy 625
• Alloy 825
• Monel 400
• Hastelloy C22
• Hastelloy C276

The final material is selected according to the actual subsea service environment and project specification.

Hydraulic Control Lines

One of the main tubing functions within a subsea umbilical is hydraulic power and control.

Long-length stainless steel or special alloy tubing can transmit hydraulic fluid between surface control systems and subsea production equipment.

Reducing tubing connections is particularly important in subsea systems where maintenance access is difficult and system reliability is critical.

Chemical Injection Lines

Umbilical tubing can also provide continuous chemical injection paths to subsea equipment and wells.

Typical chemical injection duties may include corrosion inhibition, scale control and other production chemicals.

By using long continuous tubing, the number of intermediate connections along the chemical injection path can be reduced.

Corrosion Resistance for Marine Service

Offshore and subsea tubing operates in environments where chloride exposure, seawater and aggressive production media can significantly affect material performance.

BAOFENG can provide stainless steel, duplex, super duplex and nickel alloy tubing options according to corrosion requirements.

Special alloy tube blank capability includes materials such as 904L, Alloy 825, Alloy 625, 2205, 2507, Monel 400 and Hastelloy C276.

Inspection & Quality Control

BAOFENG seamless coiled tubing is subject to air-tightness testing and eddy current inspection.

Additional hydrostatic and ultrasonic testing can also be arranged according to project requirements.

For subsea and offshore projects, testing and documentation can be configured according to the specified material, pressure and project requirements.

Development for Marine Umbilical Applications

BAOFENG is not positioning marine umbilical tubing only as a theoretical application.

Its development history records cooperation with a domestic umbilical manufacturer on stainless steel coiled tubing specifically for marine umbilical applications.

This development combines BAOFENG’s long-length seamless tubing capability with the demanding dimensional, material and reliability requirements of subsea systems.

From Coiled Tubing to Umbilical Tubing Solution

BAOFENG can support project configuration according to the actual umbilical requirement:

Service function → Material selection → OD & wall thickness → Working pressure → Continuous length → Dimensional control → Inspection & testing → Coiling → Project delivery

The tubing configuration can be developed for hydraulic control, chemical injection or other fluid-service functions within the umbilical system.

Project-Based Configuration

To recommend a suitable marine umbilical tubing configuration, please provide:

• Tubing function
• Required material
• OD × wall thickness
• Working pressure
• Operating temperature
• Service medium
• Required continuous length
• Water depth / offshore environment
• Inspection requirements
• Applicable project specifications

BAOFENG can then evaluate the tubing configuration according to the technical requirements of the subsea umbilical project.