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Water treatment environments demand corrosion-resistant, hygienic, and leak-free piping systems. Our prefabrication services deliver ready-to-install pipe spools that reduce on-site welding and accelerate plant commissioning.
Prefabricated components for water treatment include:
Pipe Spools — Custom-cut straight runs with welded end fittings
Flange Assemblies — Weld neck and slip-on flanges for pump and valve connections
Elbow & Tee Fittings — 45°/90° elbows and equal/reducing tees for flow distribution
Manifold Headers — Multi-port distribution and collection headers
Reducer Assemblies — Concentric reducers for pump suction and discharge lines
Table
Attribute | Specification |
|---|---|
Materials | SS 316/316L, SS 304/304L, SS 2205 Duplex |
Pipe Standards | ASTM A312, ASTM A269, ASTM A790, AWWA C220 |
Fitting Standards | ASME B16.9, ASME B16.11, MSS SP-43 |
Flange Standards | ASME B16.5, AWWA C207, EN 1092-1 |
Size Range | DN15 – DN600 (1/2" – 24") |
Wall Thickness | SCH 5S – SCH 80 |
Material Selection Guidance:
SS 316/316L — Chloride-rich environments, seawater desalination, chemical dosing lines
SS 304/304L — General potable water, low-chloride municipal treatment
Duplex 2205 — High-salinity wastewater, brine handling, aggressive industrial effluent
Our water treatment pipe fabrication follows strict hygiene and leak-prevention protocols.
Table
Process Step | Details |
|---|---|
Cutting | CNC band saw / orbital cutting; zero-contamination coolant for potable water pipe |
End Prep | Beveling per ASME B16.25; orbital facing for high-purity joints |
Fit-Up | Jig-controlled alignment to prevent internal misalignment and turbulence |
Welding | TIG (GTAW) root pass + MIG (GMAW) fill for full penetration; orbital welding for hygienic lines |
Post-Weld Treatment | Pickling and passivation to restore chromium oxide layer |
Inspection | 100% visual inspection + NDT per project specification |
All welders are certified to AWS D1.6 (Stainless Steel) and ASME Section IX. Weld maps and WPS/PQR documentation are provided on reque
Water treatment piping must withstand continuous pressure cycling and resist microbiologically induced corrosion (MIC). Our testing protocols ensure long-term reliability.
Non-Destructive Testing (NDT):
PT (Liquid Penetrant Testing) — Surface crack detection on all accessible welds
RT (Radiographic Testing) — Full-penetration butt weld inspection
UT (Ultrasonic Testing) — Wall thickness verification and internal flaw detection
PMI (Positive Material Identification) — Alloy verification to prevent material mix-up
Pressure & Leak Testing:
Hydrostatic Test — 1.5× design pressure held for minimum 30 minutes (ASME B31.3 / AWWA)
Pneumatic Leak Test — Air/nitrogen test for low-pressure gravity systems
Cleanliness Verification — Degreasing and flushing for potable water service
Our stainless steel pipe fabrication supports the full water treatment lifecycle:
Table
Application | Typical Piping Requirements |
|---|---|
Potable Water Treatment — Coagulation, filtration, disinfection | SS 304/316, hygienic surfaces, EPA/FDA compliance |
Wastewater Treatment — Primary/secondary/tertiary process | SS 316, MIC resistance, chemical dosing compatibility |
Seawater Desalination — RO pretreatment, brine disposal | SS 316L, Duplex 2205, high chloride resistance |
Industrial Process Water — Cooling towers, boiler feed, rinse lines | SS 304/316, high-temperature tolerance |
Sludge & Biosolids Handling — Dewatering, thickening, digestion | SS 316, abrasion-resistant welds, full penetration |
Material Traceability — Full MTRs (Mill Test Reports) with heat numbers
Welding Documentation — WPS, PQR, and welder qualification records
Third-Party Inspection — Client or TPI witness hold points available
Surface Finish Options — Mill finish, pickled, or mechanically polished (Ra ≤ 0.8 μm for hygienic service)
Packaging — End caps, nitrogen purging, and seaworthy crating for export
✅ Corrosion-Resistant Materials — 316L and Duplex alloys for aggressive water chemistries
✅ Reduced Field Welding — Pre-fabricated spools cut on-site labor by up to 70%
✅ Code Compliance — Fabrication per ASME B31.3, AWWA, and EPA standards
✅ Fast Turnaround — From drawing approval to delivery with milestone tracking
✅ Global Export Experience — Packaging and documentation for international water treatment EPC projects
Q1: What grade of stainless steel is best for water treatment piping? For most municipal potable water applications, SS 304/304L is sufficient. For chloride exposure, seawater, or chemical dosing lines, SS 316/316L or Duplex 2205 is recommended to prevent pitting and crevice corrosion.
Q2: Do you fabricate pipe spools from P&ID or isometric drawings? Yes. Submit your P&IDs, isometrics, or BOMs, and our engineers will fabricate spools to your exact dimensions, including weld gap and flange orientation.
Q3: What testing is included for water treatment pipe fabrication? Standard scope includes 100% visual weld inspection, NDT (PT/RT/UT per spec), hydrostatic pressure testing, and PMI. Test reports and material certificates are included with delivery.
Q4: Is your pipe fabrication suitable for potable drinking water systems? Yes. We use potable-water-compatible cutting fluids, perform post-weld pickling/passivation, and can provide third-party cleanliness verification upon request.
Q5: What is the typical lead time for custom water treatment pipe spools? Lead time depends on quantity and complexity, typically 2–6 weeks from drawing approval. Rush orders for critical path items can be accommodated.
