Application: Scale inhibition & dispersion in cooling water, boilers, RO systems, and oilfield operations.
1. Recommended Dosage
| Application | Dosage (mg/L) | Key Target Scales |
|---|---|---|
| Cooling Water | 5–20 | CaCO₃, CaSO₄, Fe₂O₃ |
| Boiler Water | 10–30 | Ca₃(PO₄)₂, MgSiO₃ |
| Reverse Osmosis (RO) | 2–10 | CaCO₃, BaSO₄, silica |
| Oilfield Injection | 10–50 | BaSO₄, SrSO₄ (squeeze treatments) |
Note:
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Adjust dosage based on water hardness, pH, and system temperature.
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For high scaling potential (e.g., LSI > 2.5), use upper dosage limits.
2. Dilution & Feeding
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Dilution: Pre-dilute HPMA with deionized water (1:5 to 1:10 ratio) to avoid localized high concentrations.
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Feed Point: Inject continuously into the feedwater line or circulation system.
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Avoid Incompatible Chemicals: Do not mix with cationic polymers or high-dose oxidizers (e.g., >5 mg/L free chlorine).
3. Compatibility & Synergies
| Compatible With | Incompatible With | Synergistic Blends |
|---|---|---|
| Phosphonates (ATMP/HEDP) | Aluminum-based coagulants | HPMA + PAA (enhanced dispersion) |
| Zinc-based inhibitors | High-valent metal ions (Fe³⁺, Al³⁺) | HPMA + PBTC (high-temperature scale control) |
4. Monitoring & Control
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Key Parameters:
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pH: Optimal range 7.0–9.5.
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Conductivity: Monitor to avoid over-concentration.
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Residual HPMA: Maintain 2–5 mg/L in circulating water (test via phosphonate-specific assays).
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Deposit Checks: Inspect heat exchangers quarterly for scale buildup.
5. Safety & Handling
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Storage: Keep in HDPE containers at 5–40°C; avoid freezing.
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Personal Protection: Wear gloves and goggles; rinse skin/eyes immediately if contacted.
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Environmental Note: Low toxicity (LD50 > 5,000 mg/kg), but comply with local P discharge limits.
6. Troubleshooting
| Issue | Possible Cause | Solution |
|---|---|---|
| Reduced inhibition | Overdosed cationic polymers | Flush system; adjust feed ratio |
| Cloudy water | Precipitation with Fe³⁺/Al³⁺ | Pre-treat with dispersants or reduce metal ions |
| Pump clogging | Undiluted HPMA crystallization | Dilute before feeding; clean filters |
For Optimal Performance:
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Conduct water analysis (Ca²⁺, Mg²⁺, SO₄²⁻, SiO₂) before dosing.
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Pair with corrosion inhibitors (e.g., Zn²⁺, molybdate) for dual protection.
Contact Supplier for system-specific formulations if scaling is severe (e.g., >500 mg/L hardness as CaCO₃).