ASTM A269 TP304 Bright Annealed Instrumentation Tubing for Hydraulic Control Systems

ASTM A269 TP304 Bright Annealed Instrumentation Tubing for Hydraulic Control Systems

What Makes TP304 Instrumentation Tubing Different?

Instrumentation tubing consists of small-diameter, precision-engineered pipes used to connect industrial instruments, valves, and control equipment. It is primarily employed for the transport of hydraulic fluids, gases, and other fluid media, as well as for pressure measurement and signal transmission. Such tubing must offer high dimensional accuracy, excellent corrosion resistance, and reliable sealing to minimize the risk of leaks or connection failures. MTSCO supplies welded instrumentation tubing that complies with the ASTM A269 standard. These tubes undergo a "bright annealing" process, resulting in a smooth, clean surface that facilitates both further processing and on-site installation.

TP304 is an austenitic stainless steel containing chromium and nickel, known for its superior corrosion resistance, toughness, and workability. It is well-suited for instrumentation connections and hydraulic control systems in general industrial environments, effectively meeting standard fluid-conveyance requirements.

Specifications

About Siri Tubing

Siri Tubing is a specialized manufacturing facility for tubing and control lines under the MTSCO brand. Spanning approximately 7,000 square meters with a production capacity of 150 tons per month, our products serve sectors including oil and gas, geothermal energy, offshore operations, and underground applications. The facility is ISO-certified, and through robust manufacturing and testing capabilities, we ensure consistent product specifications and rigorous quality control for our clients.

Siri Tubing maintains comprehensive quality oversight from production and in-house testing to laboratory analysis, supporting a wide range of evaluations, including PMI (Positive Material Identification), ET (Eddy Current Testing), pneumatic/hydraulic pressure testing, mechanical property testing, hardness testing, and metallographic analysis. Our production process is fully traceable via process cards and QC records, simplifying project acceptance and quality audits. Backed by MTSCO’s global sales and project service network, Siri Tubing provides highly efficient delivery support for EPC (Engineering, Procurement, and Construction) projects and end-user applications.

From Steel Coil to Instrumentation Tube:

Our welded tubing is produced using steel coils, which are slit and formed before undergoing automated welding and in-line annealing—a process that ensures continuous, high-efficiency production. Subsequent stages include end-facing, pickling, non-destructive testing (NDT), marking, and final product inspection. Our instrumentation tubing undergoes 100% full-coverage inspection via in-line eddy current testing, with complete process traceability to ensure that every tube meets international standards.

What Tests Have Our Products Undergone?

Siri Tubing conducts rigorous testing on finished products and maintains detailed inspection records. Every batch is backed by clear quality documentation prior to delivery.

·Visual Inspection: Examines the surface and ends of the tubes to identify issues such as scratches, dents, oxidation, or other surface defects.

·Dimensional Inspection: Measures critical dimensions, including outer diameter, wall thickness, and length, against specified tolerances to prevent deviations that could affect subsequent connection and installation.

·Positive Material Identification (PMI): Verifies the material grade via spectral analysis, cross-referencing it with the Material Test Certificate (MTC) and heat number.

·Eddy Current Testing: Performs continuous inspection of the tube to detect surface and near-surface anomalies, while also verifying the integrity of the weld seam and the continuity of the tube body.

·Air / Hydraulic Pressure Testing: Assesses the structural integrity of the tube and checks for leaks. We are equipped to perform 100% air or hydraulic pressure testing at pressures ≥35 MPa.

Full-Process Quality Traceability System

For every order, we generate a dedicated "Process Card" that links the Purchase Order (PI) number to the specific production batch. We maintain a centralized archive of raw material heat numbers, original manufacturer MTCs, and secondary PMI spectral records. Furthermore, we track and document all key processes, including heat treatment and non-destructive testing (NDT). Clients may access the complete production and inspection data archive at any time or appoint a third-party inspection (TPI) agency. Through a transparent, closed-loop data system, Siri Tubing ensures that all instrumentation tubing is fully traceable and compliant from the source to final delivery.

FAQ

Q1: Do you accept third-party quality inspections?

A1: Yes, we fully support inspections by third-party agencies designated by the client, such as SGS, TÜV, or BV.

Q2: What is the purpose of bright annealing for instrumentation tubing?

A2: Bright annealing involves heat treatment in a protective atmosphere, resulting in a clean, bright surface finish on the tubing while restoring the material’s properties following cold working. This process is ideal for tubing used in instrumentation and fluid control systems.

Q3: What are the primary materials used for MTSCO coiled tubing?

A3: We offer a comprehensive range of coiled tubing in stainless steel, duplex steel, and nickel alloys, including grades such as 304, 316L, 2205, 2507, Alloy 625, and Alloy 825. All raw materials are sourced from reputable steel mills.