S31803 2205 Welded Capillary Tube 10000m Continuous Length No Butt Weld

S31803 2205 Welded Capillary Tube 10000m Continuous Length No Butt Weld

Company and Factory Introduction

As a leading supplier of industrial stainless steel piping systems, MTSCO has established a strong presence in global engineering and EPC projects through its “Factory Complexes” model. In 2024, MTSCO officially established its own production facility—Siri Tubing—dedicated to the manufacturing of high-strength stainless steel and nickel alloy welded coiled tubing. Siri Tubing’s core technological advantage lies in its exceptional performance limits: the company produces welded coils with a single-coil length of up to 50,000 feet (approximately 15,000 meters), with no butt welds along the entire length; the products can withstand ultra-high hydrostatic pressure tests of up to 100 MPa, far exceeding industry standards. In addition, Siri Tubing is ISO-certified and offers a variety of high-performance plastic coating services, including FEP, PVDF, PA11, and TPV, to meet the demands of extreme corrosive environments in deep-sea and downhole applications.

Specifications

Manufacturing Process Flow

The core manufacturing process for these welded capillary tubes typically includes strip welding, cold drawing, bright annealing, eddy current testing, and hydrostatic/air pressure testing, followed by precision coiling, marking, and final inspection as per project requirements. For small-diameter control line products, process stability directly impacts weld quality, dimensional consistency, and subsequent installation performance. MTSCO’s in-house facility, Siri Tubing, employs mature processes such as 100% laser welding, cold drawing, bright annealing, and plastic wrapping, making it suitable for the production of continuous-length control lines.

Hydrostatic and Air Tightness Testing

To verify product reliability under extreme pressure, the production laboratory performs rigorous hydrostatic/air tightness tests on every coil of finished coiled tubing. Test engineers first seal both ends of the tubing and use a high-pressure pump system to inject water or high-purity nitrogen into the tubing, gradually increasing the internal pressure to multiples of the design standard. During the specified pressure stabilization period, high-precision sensors monitor the pressure curve in real time to confirm that the tubing exhibits no deformation or leakage when simulating deep-sea high-pressure or downhole conditions.

Siri Laboratory

·Weld Radiographic Test Laboratory (RT)

·Chemical Composition Analysis Laboratory

·Intergranular Corrosion Test Laboratory

·Tensile Test Laboratory

·Hardness Test Laboratory

·Metallographic Laboratory

Equipped with professional instruments such as tensile testers, impact testers, metallographic microscopes, and hardness testers, the Siri Laboratory performs mechanical property and non-destructive testing, including tensile, flaring, flattening, bending, hardness, and radiographic testing. All test reports and samples are archived as required to facilitate order traceability, quality verification, and project acceptance.

Material Properties

2205 duplex stainless steel (UNS S31803), with its ferritic-austenitic duplex microstructure, exhibits exceptional resistance to pitting and stress corrosion cracking in acidic environments containing chlorides and hydrogen sulfide. Siri Tubing utilizes laser welding and cold drawing processes to achieve continuous production of 10,000-meter coils, resulting in no butt welds. Combined with the 2205 material’s yield strength of over 450 MPa, the product can withstand extreme tensile loads in deep-sea and high-pressure subsea environments. Every coil of tubing delivered by MTSCO undergoes 100% non-destructive testing and overpressure testing, thereby reducing installation risks and maintenance costs for global engineering projects.

FAQ

Q1: What is the maximum length of a single roll of this multi-core control cable?

A1: Our welded coiled cable is available in rolls up to 50,000 feet (approximately 15 kilometers) in length, meeting the demands of long-distance downhole cabling, reducing the number of field splices, and enhancing system reliability. MTSCO’s manufacturing facilities are equipped for the production of extra-long continuous lengths.

Q2: Do you accept third-party quality inspections?

A2: We fully support third-party inspections designated by our customers, such as SGS, TÜV, and BV.

Q3: Do you have relevant industry project experience?

A3: Our coiled tubing has long served international energy companies such as OXY, KOC, and ADNOC, and has been applied in numerous FPSO, downhole oilfield projects, and geothermal power plants, with proven track records in high-pressure and highly corrosive environments.