UN-307 RO Antiscalant for Refining at Mahmood Kot
Phosphonate antiscalant for the RO trains feeding boiler-makeup at PARCO and adjacent refining capacity in Muzaffargarh district. Karachi-stocked, dosing programme written against your feedwater.
Mahmood Kot in Muzaffargarh district hosts PARCO's mid-country refinery (around 100,000 bpd) plus the PAPCO pipeline terminal feeding the central market. All of it draws cooling, process, and boiler-makeup from the Chenab–Indus confluence, which has a distinct scaling profile compared to Karachi sea-influenced makeup or Lahore canal water.
Indus-fed feedwater at this latitude carries calcium 60–110 ppm as CaCO₃, sulphate 80–180 ppm, and silica that climbs to 30–50 ppm in the low-flow winter months. Silica is the structural concern on the RO side: any antiscalant that doesn't keep silica in solution at recovery 75%+ will start fouling the third-stage elements within months.
PARCO's water-treatment chain runs softening + cartridge filtration + RO into demineralised polishing for boiler-makeup. The RO antiscalant choice ripples downstream into how often the operators have to chemically clean the membranes and how steady the demin polishers run.
Logistics: Mahmood Kot is 850 km from Karachi Port. Stock-spec UN-307 ships in 4–6 days via NLC freight. We've dispatched programme-supply contracts to refining sites on this corridor since the early 2020s.
UN-307 is a phosphonate-based antiscalant: organic-phosphonic acid blend, active content 40–50%, density 1.20 g/cm³, pH 2.0–4.0. Inhibits CaCO₃, CaSO₄, BaSO₄, SrSO₄, silica, and iron scales through threshold inhibition, crystal modification, and dispersion. Compatible with all major polyamide membranes (CPA, ESPA, TFC). Non-chlorine-tolerant; has to be dosed downstream of dechlorination.
- Stage: dosed continuously into the RO feed line, downstream of the cartridge filters and any sodium bisulphite dechlorination skid.
- Function: holds calcium, sulphate, barium, strontium, and silica in solution past their thermodynamic precipitation limits. Lets the RO run at higher recovery (75–85%) without scaling the rear-stage elements.
- Dose range: 2–5 ppm on the feedwater. We calculate the exact figure from your feed analysis (LSI, S&DSI, sulphate ratio, silica concentration × recovery factor).
- Monitoring: monthly normalised differential pressure across each stage, plus quarterly element autopsy on cleaned membranes if available.
Where UN-307 chemistry has run on oil refining sites near Mahmood Kot.
Selected, anonymised. Site-specific case studies and references shared on supplier-qualification request.
Refining site boiler-makeup RO · Muzaffargarh district · 2022
UN-307 dosing on a 180 m³/h two-pass RO. Membrane cleaning interval extended from 8 weeks to 20 weeks; demin downstream stayed within ionic spec.
Petrochemical RO + EDI · central Punjab · 2024
Phosphonate antiscalant programme on a 90 m³/h brackish RO. Silica handled to 78% recovery without fouling.
Captive boiler RO retrofit · oil-services site · 2023
Replaced an imported antiscalant with UN-307 at 35% lower cost-in-use; cleaning chemistry consumption fell proportionally.
Tell us your site, the loop, the symptom, the volume.
Same-business-day reply from Karachi with a programme outline and the relevant CoAs / SDS attached. Or WhatsApp the engineering line directly; same engineer who writes the dosing programme answers the message.