PW & WFI Storage Tanks

Product Overview

Our Purified Water (PW) and Water for Injection (WFI) Storage Tanks are purpose-engineered for the pharmaceutical, biotechnology, and healthcare industries where water purity is critical for product safety and regulatory compliance. Manufactured exclusively from SS 316L stainless steel with electropolished interior finishes achieving surface roughness of Ra ≤ 0.2 µm or better, these tanks prevent bacterial adhesion and biofilm formation, ensuring the stored water maintains USP, EP, and IP pharmacopoeia standards throughout its shelf life. The electropolishing process removes surface contaminants and creates a passive chromium oxide layer that provides superior corrosion resistance and facilitates cleaning validation. All product contact welds are performed using orbital TIG welding technology to eliminate crevices, gaps, and heat-affected zones that could harbor bacteria or compromise water purity. Our PW and WFI tanks are designed with sloped bottoms for complete drainage, eliminating dead legs and stagnant zones that could become contamination sources. Each tank is equipped with a rotary spray ball cleaning system providing 360-degree coverage for automated CIP (Clean-in-Place) operations, and SIP (Steam-in-Place) capability for thermal sanitization at temperatures up to 130°C. The tanks feature jacketed construction with thermal insulation to maintain water temperature within specified ranges, preventing microbial growth and ensuring consistent water quality. Standard instrumentation includes PT100 temperature sensors, pressure gauges, level transmitters, and conductivity probes for continuous monitoring and data logging to support batch documentation and regulatory audits. All tanks are supplied with 0.2-micron hydrophobic vent filters to prevent airborne contamination while allowing pressure equalization during filling and dispensing operations. The tanks comply with cGMP requirements, FDA 21 CFR Part 11 for electronic records, ASME BPE standards for bioprocessing equipment, and ISPE baseline guides for pharmaceutical water systems. We provide complete documentation packages including FAT (Factory Acceptance Test) protocols, material certifications traceable to mill test certificates, welding procedures, surface finish reports, and IQ/OQ support for validation activities.

Key Features & Specifications

• Material: SS 316L (cGMP grade)
• Electropolished interior finish (Ra ≤ 0.2 µm)
• Orbital welding for all product contact welds
• Integrated CIP/SIP systems
• Spray ball cleaning system
• 0.2 micron hydrophobic vent filter
• Slope bottom for complete drainage
• Jacketed design for temperature maintenance
• Full compliance with cGMP, USP, EP standards

Applications