ASME BPE Compliant Stainless Steel Coil Tube for Bioprocessing Equipment
Product Overview
This stainless steel coil tube (Coiltube) is engineered and manufactured in strict accordance with the ASME BPE (Bioprocessing Equipment) Standard, which serves as the globally recognized design, fabrication, and documentation framework for bioprocessing equipment used in the pharmaceutical, biotechnology, and food-grade processing industries. Developed jointly by the American Society of Mechanical Engineers (ASME) and the Bioprocessing Equipment (BPE) Group, the standard ensures that all equipment components — including tubing, fittings, valves, and heat exchangers — are designed to minimize product contamination, facilitate complete cleaning and sterilization, and maintain the integrity of sensitive biological products throughout their lifecycle.
Wenzhou Jixing Metal Materials Co., Ltd. supplies this coil tube specifically for hygienic-grade applications where sterility, corrosion resistance, and traceability are non-negotiable. The product is supplied in coil form to facilitate seamless integration into complex process piping systems, heat exchangers, and bioreactor assemblies without requiring additional welding at installation points.
Material & Properties
The coil tube is manufactured from high-purity austenitic stainless steels conforming to ASME BPE material specifications. The primary grades include:
- SUS 316L (UNS S31603) — the predominant grade for bioprocessing, offering superior corrosion resistance due to molybdenum (Mo) content of 2.0–3.0%, with a maximum carbon content of 0.03% to prevent intergranular corrosion.
- SUS 316L Mod (UNS S31603 Modified) — a modified variant with reduced interstitial elements (C ≤ 0.015%, N ≤ 0.030%, S ≤ 0.020%) to achieve even lower chromium oxide levels on the surface, ensuring enhanced biocompatibility and reduced protein adhesion.
- SUS 304L (UNS S30403) — available for less aggressive process environments where chloride exposure is minimal.
Key material properties include:
- Corrosion resistance against a wide range of pharmaceutical solvents, cleaning agents (CIP/SIP solutions), and aqueous process media.
- Excellent weldability with full penetration welds suitable for orbital automated welding.
- Non-magnetic in the annealed condition, ensuring compatibility with MRI environments and magnetic separation processes.
- Low surface energy characteristics that resist biofilm formation and facilitate Clean-In-Place (CIP) and Sterilize-In-Place (SIP) protocols.
Specifications
| Parameter | Specification | Standard Reference |
|---|---|---|
| Product Form | Coil Tube (Continuous Coil / Spooled Tubing) | ASME BPE §1.1 |
| Material Grade | SUS 316L / 316L Mod / 304L (Austenitic Stainless Steel) | ASME BPE §1.2 | Outer Diameter (OD) | 6.0 mm – 159.0 mm (customizable per project) | ASME BPE Table 1 |
| Wall Thickness (WT) | 0.8 mm – 3.2 mm (tolerance ±10%) | ASME BPE §1.3 |
| Surface Finish (Ra) | ≤ 0.4 μm (Longitudinal Electropolished); ≤ 0.6 μm (Mirror Polished) | ASME BPE §1.4 |
| Internal Surface Roughness | ≤ 0.4 μm Ra (Process Wetted Surfaces) | ASME BPE §1.4 |
| Coil Diameter | 500 mm – 2,000 mm (adjustable to application) | — |
| Coil Length | Custom (typically 50 m – 500 m per coil) | — |
| End Condition | Plain Ends / Beveled Ends / Pre-Welded Fittings | ASME BPE §2 |
| Weld Quality | Full-Penetration Orbital TIG Weld; Internal Ra ≤ 0.4 μm post-weld electropolish | ASME BPE §2.2 |
| Pressure Rating | Up to 1.6 MPa (PN16) standard; higher ratings available | ASME BPE §3 |
| Temperature Range | −40 °C to +200 °C (SIP compatible) | ASME BPE §3 |
| Heat Treatment | Solution Annealed + Water Quenched (No Pickling Residue) | ASME BPE §1.5 |
| Chromium Oxide Content | ≤ 10 μg/cm² (post-electropolishing) | ASME BPE §1.4 |
| Documentation | Full Traceability: Heat Number, Mill Certificate, Weld Log, Surface Finish Report | ASME BPE §5 |
Manufacturing Process
The production of ASME BPE-compliant coil tube follows a rigorously controlled multi-stage process:
- Raw Material Procurement: Virgin stainless steel strip is sourced from certified mills with full chemical composition analysis and mechanical property verification. Each heat lot is traceable from the mill through the entire manufacturing chain.
- Forming & Coiling: The strip is cold-formed into the specified OD and WT dimensions using precision rollers, then wound into a continuous coil on a calibrated coiling machine to maintain dimensional accuracy and avoid work hardening.
- Welding (if applicable): Seam welding is performed via automated orbital TIG (Tungsten Inert Gas) welding under argon shielding, ensuring full-penetration welds with minimal heat-affected zone (HAZ) distortion.
- Solution Annealing: The coil tube is heat-treated at 1,050 °C – 1,150 °C followed by rapid water quenching to restore the fully austenitic microstructure, eliminate residual stresses, and achieve maximum corrosion resistance.
- Electropolishing: A controlled electrochemical process removes a thin layer of surface material (typically 10–25 μm), reducing surface roughness to ≤ 0.4 μm Ra, dissolving chromium-rich oxide layers, and achieving a passive, smooth surface free of contamination.
- Final Inspection: Surface finish is verified using contact profilometry; dimensional accuracy is checked via ultrasonic thickness gauging and optical measurement; visual inspection confirms freedom from pitting, scratches, or discoloration.
Applications
ASME BPE-compliant coil tube from Wenzhou Jixing Metal Materials Co., Ltd. is deployed across the following bioprocessing domains:
- Bioreactor Systems: Process piping for upstream fermentation, cell culture, and downstream purification in monoclonal antibody (mAb) and vaccine production.
- Heat Exchangers: Coiled configurations for plate-and-frame or shell-and-tube heat exchangers requiring precise temperature control during sterilization and pasteurization cycles.
- Chromatography & Filtration Systems: Transfer lines connecting chromatography columns, ultrafiltration/diafiltration (UF/DF) modules, and sterile filtration units.
- CIP/SIP Piping: Dedicated Clean-In-Place and Sterilize-In-Place loops where dead-leg minimization and surface integrity are critical to preventing microbial contamination.
- Formulation & Filling Lines: Sterile transfer of cell culture media, buffers, excipients, and final drug products in aseptic processing environments.
- Food & Dairy Processing: Ultra-pasteurization (UHT), aseptic filling, and hygienic fluid transfer systems governed by equivalent sanitary standards (EHEDG, 3-A).
Quality Certifications & Compliance
The product and manufacturing process are governed by a comprehensive quality assurance framework:
- ASME BPE Compliance: Full adherence to the ASME Bioprocessing Equipment Standard, covering design, materials, fabrication, welding, surface finish, and documentation requirements.
- ISO 9001:2015: Quality Management System certification ensuring consistent product quality and continuous improvement.
- ISO 13485: Medical Devices Quality Management System (applicable for tubing used in medical device manufacturing).
- 21 CFR Part 11 Compliance: Electronic documentation and data integrity systems supporting FDA-regulated bioprocessing environments.
- GMP (Good Manufacturing Practice): Manufacturing facilities and processes aligned with pharmaceutical GMP expectations for critical process equipment.
- EHEDG (European Hygienic Engineering Design Group): Design principles compliant with European hygienic engineering standards for food and pharmaceutical equipment.
Unique Selling Points
- End-to-End Traceability: Every coil tube is accompanied by a complete documentation package including mill test certificates (MTC), heat number traceability, welding logs, surface finish verification reports, and final inspection certificates — satisfying the stringent audit requirements of pharmaceutical regulators (FDA, EMA).
- Superior Surface Integrity: Electropolished surfaces with Ra ≤ 0.4 μm minimize protein adsorption, reduce bacterial adhesion, and ensure reliable CIP/SIP performance — critical for maintaining product purity and batch consistency.
- Coil Form Advantage: Supplied in continuous coil configuration to minimize installation welding, reduce potential contamination points, and enable flexible layout design in compact bioprocessing facilities.
- Customization Capability: Flexible specifications for OD, WT, coil diameter, length, and end conditions tailored to specific bioprocess requirements and equipment OEM needs.
- Material Purity Assurance: Use of low-carbon, low-interstitial-element grades (316L Mod) ensures minimal elemental leaching into sensitive bioprocess streams, protecting product quality and patient safety.
Note: All ASME BPE-compliant coil tube products are manufactured under controlled cleanroom conditions and undergo rigorous final inspection prior to shipment. Custom specifications, sampling protocols, and third-party testing (e.g., SEM analysis, XRF composition verification) are available upon request to meet specific customer or regulatory requirements.