Bright Annealed Alloy 625 Geothermal Coiled Tubing ASTM B704

Bright Annealed Alloy 625 Geothermal Coiled Tubing ASTM B704

Company and Factory Introduction

MTSCO provides stainless steel and nickel alloy product solutions for global industrial piping projects, serving industries such as oil and gas, chemicals, marine, and heat exchange equipment. For control line products, MTSCO established its own factory, Siri Tubing, in 2024, specializing in the production of welded coiled tubing, geothermal coiled tubing, control line tubing, and multi-core cables, all of which are ISO-certified. Leveraging our in-house manufacturing capabilities, MTSCO ensures more consistent quality control, reliable delivery coordination, and robust project support. We do more than just sell products—we are your trusted supply chain partner.

Specifications

Application Scenarios

Geothermal coiled tubing are primarily used in geothermal well development, geothermal energy extraction, downhole fluid transport, chemical injection, pressure monitoring, and temperature monitoring. Since geothermal environments typically involve high temperatures, high pressures, corrosive media, and continuous deep-well operations, there are stringent requirements for the pipes’ corrosion resistance, pressure-bearing capacity, weld stability, and continuous length. MTSCO geothermal coiled tubing is available in various materials and lengths to meet project requirements, making it suitable for geothermal power generation, district heating, downhole control systems, and complex energy development projects.

Manufacturing Process Flow

The core manufacturing process for this geothermal coiled tubing typically includes strip welding, cold drawing, bright annealing, eddy current testing, and hydraulic/air tight 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.

Geothermal Coiled Tubing Final Product Inspection Process

In high-pressure transport applications such as oil and gas, downhole operations, and deep-sea environments, the operational stability of coiled tubing is central to risk management. To this end, MTSCO has established a rigorous final product inspection system to ensure that coiled tubing meets quality standards.

First, the quality team verifies material composition through PMI testing to eliminate the risk of material mix-ups. Second, inspectors conduct rigorous dimensional and visual inspections to ensure the product’s physical specifications fully comply with engineering requirements. Given the continuous-length production process, technicians use Eddy Current Testing (ET) to identify deep-seated defects in the tubing. Subsequently, quality inspectors perform hydraulic/air tight tests to verify the product’s pressure integrity under simulated operating conditions. Finally, we test the product in the laboratory to ensure all performance specifications are met.

Eddy Current Testing (ET)

MTSCO’s technical team uses an automated eddy current testing system to perform 100% full-length scans on every coil of tubing. This equipment can detect minute cracks, gaps, and wall thickness anomalies on the surface or near-surface of continuous tubing in real time without making physical contact with the tubing. MTSCO insists on performing 100% full-length coverage eddy current testing on every coil of geothermal coiled tubing, spanning several kilometers in length, to ensure that automated equipment can accurately identify and locate any potential physical defects. This testing method mitigates potential risks for global engineering projects, thereby providing remote procurement clients with assured safety guarantees.

Quality Control System

·Raw Material Re-inspection: Raw materials are sourced from suppliers such as POSCO, TSINGSHAN, and JISCO. Each batch must be accompanied by an MTC and PMI. Upon arrival at the factory, materials undergo re-inspection to confirm that the material properties meet order specifications. MTSCO employs secondary verification to minimize the risk of material errors and mix-ups.

·Process Traceability: Every stage—from welding, cold drawing, and annealing to packaging—is supervised by the QC team, with records maintained through production process sheets and photographic documentation.

·Pre-shipment 100% Inspection: Prior to shipment, inspections are conducted for appearance, dimensions, quantity, PMI, airtightness, ET, and hydrostatic pressure tests. We also support third-party inspections by SGS, TÜV, and BV. MTSCO provides comprehensive quality assurance documentation for high-standard 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: What is the maximum length per coil for this multi-core control cable?

A2: Our welded coils can reach a maximum length of 50,000 feet (approximately 15 kilometers) per coil, meeting the demands of long-distance downhole cabling, reducing on-site splices, and enhancing system reliability. MTSCO’s manufacturing facilities are equipped with the capability for ultra-long continuous production.

Q3: How is the quality of the coils inspected?

A3: We conduct a three-tier quality inspection process: raw material PMI testing, full traceability throughout the production process, and 100% high-pressure testing plus eddy current testing prior to shipment. All welded coiled tubing must pass rigorous leak testing, and complete inspection records and photographs are retained. MTSCO supports on-site inspections by third-party authoritative agencies to ensure zero-defect delivery for every batch of products.