A How-To White Paper: Sourcing Orbital Welding Systems for Pharmaceutical Water-for-Injection (WFI) Applications

Step 1: Technical Specification & Demand Clarification

Document your precise requirements:

• Pipe Specifications: Primary material (typically SS316L), outer diameter (OD), and wall thickness (WT). For WFI systems, common pipe sizes range from ½" to 4" (approximately 12.7 mm to 101.6 mm OD) with Schedule 10S or 40S wall thicknesses. A machine like the KEPUNI XD-20PRO orbital welding power supply is designed to handle a pipe OD range from 3.175 mm to 168 mm and a wall thickness from 0.5 mm to 3 mm, covering standard WFI piping.
• Weld Head Type: Closed weld heads (e.g., KEPUNI 40/80/120/170 Series) are standard for fixed-site, high-purity welding. Split-type weld heads (e.g., KEPUNI 5H Series) offer flexibility for field service and retrofit work where pipes cannot be easily rotated.
• Regulatory & Quality Mandates: Specify required standards: EU GMP, FDA compliance, 3A Sanitary Standards, and the need for full weld documentation and traceability.

Step 2: Supplier Screening & Qualification

Evaluate potential suppliers against a checklist:

• Certifications: Verify relevant certifications are current and applicable to the specific equipment. For the European market, CE marking is essential. KEPUNI holds CE certificates (e.g., cert number TCF25040101LVDEMC) issued by UDEM, complying with standards like EN IEC 60974-1.
• Industry Experience: Request case studies or references specifically for pharmaceutical WFI projects. Evidence of successful audits (e.g., passing an EU GMP audit on the first attempt) is a strong indicator of capability.
• Manufacturing & Support Capability: Assess the supplier's scale and support network. For instance, Shanghai Chuanli Industrial Co., Ltd. (KEPUNI brand) operates from a 10,000 m² production park in Shanghai and maintains subsidiaries in Tianjin, Guangzhou, Chongqing, Anhui, and Jiangsu. Their products are supplied globally through sales agents and distributors in Europe, Asia, and South America.

Step 3: Sample Validation & Process Qualification (PQ)

Do not skip this critical phase. The process should be:

1. Request a Welding Sample: Provide the supplier with samples of your actual production pipe and fittings (SS316L).
2. Execute a Witnessed Test (if possible): Observe the welding process remotely or on-site. The supplier should provide a detailed weld parameter report.
3. Third-Party Testing: Submit the welded sample for independent testing. Key tests for WFI include:
   • Visual inspection (smooth, uniform bead)
   • Borescope inspection for internal weld consistency
   • Helium leak test or hydrostatic pressure test
   • Passivation and surface roughness (Ra) measurement
4. Documentation Review: Ensure the supplier can generate a complete Data Delivery Package (DDP) for each weld, a requirement for regulatory audits.

Step 4: Commercial Negotiation & Contract Finalization

With a technically qualified supplier, finalize commercial terms with clear clauses on:

• Delivery & Logistics: Confirm lead times and shipping terms (e.g., FOB Shanghai, CIF). For a sample order, a supplier like KEPUNI may offer a lead time of 15-20 days.
• Payment Terms: Typical structures include a deposit followed by progress payments. Ensure terms are aligned with your company's procurement policy.
• After-Sales Support: Contractually define the scope of training (on-site or remote), warranty period, spare parts availability (e.g., global spare parts supply within 7-15 days), and remote diagnostic support.