ASME BPE Compliant Stainless Steel Coil Tube for Biopharmaceutical Processing

Product Overview

The ASME BPE compliant Stainless Steel Coil Tube is a precision-engineered sanitary process component manufactured by Wenzhou Jixing Metal Materials Co., Ltd. Designed specifically for biopharmaceutical, biotechnology, and sterile processing applications, this coil tube conforms to the ASME BPE (Bioprocessing Equipment) standard — the globally recognized industry benchmark for hygienic process equipment in the pharmaceutical and biotech sectors.

ASME BPE establishes rigorous requirements for design, material selection, manufacturing, inspection, and documentation traceability, ensuring that all process equipment eliminates contamination risks, supports validated cleaning (CIP/SIP) procedures, and maintains product integrity throughout the manufacturing lifecycle. This coil tube is engineered to meet the most stringent sanitary design principles demanded by FDA 21 CFR, EU GMP Annex 1, and PIC/S guidelines.

Material & Properties

The coil tube is fabricated from high-purity austenitic stainless steels selected for superior corrosion resistance, biocompatibility, and cleanability:

316L Stainless Steel (UNS S31603) — The primary material grade, containing low carbon (≤0.03%) to prevent intergranular corrosion during welding. Contains 2–3% Molybdenum for enhanced resistance to chloride-induced pitting and crevice corrosion.
316L Mod (UNS S31803 equivalent) — An upgraded variant with reduced sulfur and phosphorus content, providing an exceptionally low carbon equivalent for superior weldability and surface quality.
904L (UNS N08904) — Available for applications requiring extreme corrosion resistance in aggressive chemical environments.

Key material properties include:

Non-magnetic (low magnetic permeability)
High purity with total interstitial elements (C + N) ≤ 0.04%
Smooth, non-porous surface with no dead legs or crevices
Resistance to stress corrosion cracking (SCC)
Full compliance with ASTM A270 / EN 10217-7 for seamless tubing

Specifications

Parameter	Specification	Standard Reference
Material Grade	316L / 316L Mod / 904L	ASTM A270, ASME BPE 2022
Surface Finish	Electropolished (EP) ≤ 0.4 µm Ra; Passivated	ASME BPE, ASTM A967
Nominal Outer Diameter	6 mm – 50.8 mm (¼" – 2")	ASME BPE, Tri-Clamp Dimensions
Wall Thickness	0.5 mm – 2.0 mm	ASME BPE
Coil Diameter	Custom (typically 100 mm – 600 mm)	Customer Specification
Welding Method	Orbital TIG / Laser Welding (internal mirror finish)	ASME BPE, ISO 15001
Weld Inspection	100% Visual + 100% Borescope (if applicable)	ASME BPE, ISO 9001
Tolerance on Diameter	±0.1 mm	ASME BPE
Roundness	≤ 0.05 mm	ASME BPE
Surface Roughness (Internal)	≤ 0.4 µm Ra (Electropolished)	ASME BPE
Surface Roughness (External)	≤ 0.8 µm Ra	ASME BPE
Pressure Rating	Up to 16 bar (PN16) at 20°C	ASME BPE
Operating Temperature	−196°C to +400°C	Material-dependent
End Connection	Tri-Clamp / Sanitary Flange / Butt Weld	ASME BPE, ISO 2852
Cleanliness Class	Class 1 (Biopharmaceutical Grade)	ASME BPE

Manufacturing Process

Each coil tube is produced through a tightly controlled, multi-stage manufacturing process designed to meet the exacting requirements of ASME BPE:

Material Selection & Verification — Certificates of Analysis (CoA) are obtained for each heat of stainless steel, verifying chemical composition, purity levels, and mechanical properties. Spectroscopic analysis (PMI — Positive Material Identification) is performed at point of receipt.
Forming & Coiling — Seamless tubing is precision-formed into coil geometry using CNC-controlled coiling equipment to maintain dimensional accuracy and avoid work-hardening or surface damage.
Orbital TIG / Laser Welding — All welds are performed using automated orbital TIG welding or laser welding with inert gas (argon) shielding on both internal and external sides. This produces smooth, mirror-like internal weld surfaces with no crevices, inclusions, or cold shuts.
Electropolishing — The entire tube surface (internal and external) undergoes electrochemical polishing using a sulfuric acid–phosphoric acid electrolyte solution. This process removes the cold-worked surface layer, eliminates micro-crevices, and achieves a surface roughness of ≤ 0.4 µm Ra.
Passivation — Following electropolishing, the tube is passivated using a citric acid or nitric acid solution to restore the native chromium oxide protective layer, enhancing corrosion resistance and ensuring long-term biocompatibility.
Final Cleaning & Inspection — The coil tube is cleaned using deionized water (DI water, ≤ 1 µS/cm) and inspected for surface defects, dimensional compliance, and weld integrity. 100% visual inspection and borescope examination of welds are conducted.
Protective Packaging — Tubes are packaged in protective foam-lined containers with desiccants to prevent contamination and surface damage during transit.

Applications

This ASME BPE compliant coil tube is designed for critical applications in the biopharmaceutical and related industries:

Bioreactor Heat Exchangers — Coil tubes serve as integral heat exchange elements within bioreactors for precise temperature control during cell culture and fermentation processes.
Chromatography Systems — Used as guard column housings and flow-path components in HPLC/UHPLC systems for protein purification and analytical separations.
Ultrafiltration & Nanofiltration Units — Integral to membrane filtration systems for virus removal, buffer exchange, and product concentration.
Sterile Filling Lines — Components of aseptic processing equipment including filling nozzles, tubing runs, and product transfer manifolds.
WFI (Water for Injection) Systems — Loop tubing and heat exchanger coils in pharmaceutical-grade water distribution systems.
Biopharmaceutical Downstream Processing — Tangential Flow Filtration (TFF) systems, viral filtration, and product polishing steps.
Vaccine Manufacturing — Components in vaccine formulation, cell culture media preparation, and final product filling.

Quality Certifications & Documentation Traceability

Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management system aligned with the following international standards and certifications:

ASME BPE 2022 — Full compliance with the Bioprocessing Equipment standard, including all design, manufacturing, and documentation requirements.
ISO 9001:2015 — Quality Management System certification ensuring consistent product quality and customer satisfaction.
ISO 13485:2016 — Medical Device Quality Management Systems (where applicable to end-use applications).
EU GMP Annex 1 — Design and manufacturing practices aligned with Good Manufacturing Practice requirements for sterile pharmaceutical products.
FDA 21 CFR Part 11 & 211 — Compliance with U.S. Food and Drug Administration regulations for electronic records and pharmaceutical manufacturing.
CE Marking (EU MDR 2017/745) — Conformity with European medical device regulations where applicable.

Unique Selling Points

Complete Documentation Traceability System — Every coil tube is accompanied by a comprehensive traceability package including:

Material Certificate of Analysis (CoA) with full chemical composition and mechanical property data for each heat number
Weld Procedure Qualification Records (WPQR) and Welding Procedure Specifications (WPS)
Electropolishing and passivation process records with bath chemistry logs
Dimensional inspection reports and surface roughness measurement certificates
Weld inspection reports (visual and borescope)
Batch-specific identification and unique serial numbering for full lot traceability

Sanitary Design Excellence — The coil tube design eliminates all potential contamination harborage points:

No dead legs, crevices, or surface irregularities
Smooth transitions at all joints and connections
Electropolished internal surfaces with Ra ≤ 0.4 µm for superior cleanability
Designed for full CIP (Clean-in-Place) and SIP (Sterilize-in-Place) compatibility

Premium Surface Finish — The electropolished and passivated surface provides:

Enhanced corrosion resistance through a thickened, uniform chromium oxide layer
Reduced microbial adhesion and biofilm formation
Superior cleanability and reduced cleaning agent requirements
Long-term surface stability even under repeated CIP/SIP cycles

Technical Support & Customization

Wenzhou Jixing Metal Materials Co., Ltd offers full engineering support for custom coil tube designs, including:

Custom coil diameter, pitch, and length configurations
Special end connections and fitting integrations
Design review and compliance consulting for ASME BPE, GMP, and FDA requirements
Sample prototyping and validation support for regulatory submissions
Technical documentation packages tailored to customer audit and regulatory submission needs

Note: All products are manufactured under a controlled quality environment and are available with full ASME BPE documentation packages. Customers are encouraged to provide application-specific requirements during the ordering process to ensure optimal product selection and configuration.