Static Mixer Selection Checklist: 5 Stages From Duty to PO

KEY TAKEAWAYS

1. Duty data first — flow, viscosity, density, temperature, and CoV target drive every later decision.
2. Re > 2,000 → blade; Re < 2,000 → helical; solids → non-clog — the element decision is mechanical, not aesthetic.
3. ΔP check before PO — 0.3–1.0 bar (6 elements) must fit pump head margin; retrofits fail here most often.
4. Material follows chemistry — PVC (NSF 61) water, PP aggressive, PVDF oxidizers, 316 SS pressure/sanitary.
5. Verify with the manufacturer — reputable suppliers re-run sizing and flag issues before quoting.

Stage 1: Gather Duty Data

• Fluid(s) and ratio
• Flow rate (m³/h or GPM)
• Density (kg/m³)
• Viscosity (cP or Pa·s)
• Temperature (°C)
• Mixing goal (CoV target, time)

Stage 2: Determine Flow Regime

• Calculate Reynolds number: Re = (ρ×v×D)/μ
• Re > 2,000 → turbulent → blade elements
• Re < 2,000 → laminar → helical elements
• Solids present → non-clog elements

Stage 3: Choose Configuration

• Element count: 6 standard / 12 critical (CoV)
• Pipe size matched to line (never undersize)
• End connections: NPT / flanged / plain
• Injection port needed? (dosing lines: yes)

Stage 4: Verify Pressure Drop & Material

• ΔP = K × N × (ρv²/2) — calculate
• Compare ΔP vs pump head margin (< ~10% rule)
• Material: PVC (NSF 61) / PP / PVDF / 316 SS
• Standards: ASTM D2467, ANSI B1.20.1, NSF 61

Stage 5: Document & Purchase

• Full spec sheet (duty → Re → element → ΔP → material)
• Send to manufacturer for confirmation
• Request: drawings, material certs, CoC
• Compare quotes on engineering support, not price alone
• Audit to PO — only after ΔP and material verified

⚠️ Gate Conditions (Don't Skip)

• Never PO before ΔP verification — pump retrofits are the #1 failure
• Never assume material compatibility — confirm with the chemistry table
• Never undersize the mixer — velocity drives mixing
• Never copy a competitor's size — size from YOUR duty

FAQ

Q: How long does the selection process take? With a manufacturer's sizing support, 1-2 working days — duty data in, spec confirmed, quote out.

Q: What if I don't know my viscosity exactly? Estimate from the fluid type (water 1 cP, oils 10-1000 cP) and confirm with the manufacturer — they'll flag sensitivity.

Q: Do you provide a completed spec sheet? Yes — we return a full sizing sheet with every quote: Re, element, ΔP, material, connections.

Your Quick Takeaway

Run the 5 stages once, and your mixer spec is done. We'll verify it for free — send us your duty data.

→ Send us your duty data for a verified spec sheet & quote — typically answered within 24 hours.