All process openings use SBV or RTP connections the feed vessel docks onto the mill inlet under a mechanical double-interlock that prevents the valve from opening until the flange is fully seated and pressure-tested. The housing is held at −30 to −50 Pa relative to the surrounding room by a dedicated local exhaust ventilation (LEV) unit with HEPA H14 filter any gap in the mill body draws room air inward rather than allowing API-laden air outward. The impeller rotates at 700–3,000 RPM (VFD) in the contained housing; sized granule discharges through a lower SBV or RTP into a lined IBC or collection vessel. All blade and screen changes are made through integrated glove ports with ATEX-rated gauntlet gloves without breaking the housing seal. All mill parameters and LEV differential pressure are logged by PLC for 21 CFR Part 11 electronic batch record compliance.
Challenges
SBV Docking Sequence Creating Momentary Gap at Inlet
Improper docking sequence leaves a transient open gap API dust released at docking point.
Blade and Screen Change Through Glove Ports (Restricted Reach and Leverage)
Glove port geometry limits operator reach to 350–450 mm full impeller access and screen torque restricted.
LEV Negative Pressure Disrupted by High-Speed Impeller Rotation
Impeller-generated positive pressure at outlet opposes LEV negative pressure ΔP narrows or reverses.
Screen Blinding Undetected Under Contained Operation (No Visual Access)
Progressive screen blinding reduces throughput and widens PSD without operator being able to see inside.
CIP Validation Across Contained Housing, Glove Ports, and SBV/RTP Interfaces
Complex contained geometry requires validated CIP coverage on all internal surfaces without disassembly.
Solutions
- Mechanical Double-Interlock SBV Docking (Pneumatic Confirm Before Valve Opens): Inlet valve cannot open until vessel flange pressure-test confirms zero gap zero emission at docking.
- Extended-Reach Glove-Port Tool Set (450 mm, 600 mm, 750 mm Tool Lengths): Tool set covers full mill body from glove port blade bayonet lock and screen torque achievable at any depth.
- Counterbalance Relief Valve on Mill Outlet Housing: Spring-loaded relief valve on outlet compensates impeller positive pressure LEV ΔP maintained at −35 Pa.
- Online Throughput and Motor Power Monitoring (PLC Alarm at ±15% Deviation): PLC motor current trend detects progressive screen blinding alerts operator before specification breach.
- CIP Lance Through Glove Port + TOC and HPLC Wipe Test Protocol: Dedicated spray lance enters through glove port; all surfaces reach >3 m/s CIP velocity; TOC <10 ppm validated.
Applications
- Pharmaceutical (Cytotoxic): Oncology API granule sizing OEB 5 (<1 µg/m³) validated; SBV/RTP charging and discharge.
- Pharmaceutical (Hormonal): Hormonal and endocrine compound granule milling strict containment throughout.
- Pharmaceutical (Potent OEB 4): High-potency API granule de-lumping SBV contained charging and closed IBC discharge.
- Pharmaceutical (Sterile): Sterile API granule milling in contained cleanroom integration no open powder steps.
- Research & Development: HPAPI feasibility milling at gram scale contained lab multi mill with glove box coupling.
Models & Capacities
| Type 3C Contained / HPAPI Multi Mill: Models & Capacities | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Model | Scale | Throughput [kg/h] | Screen Aperture [mm] | Impeller Speed [RPM] | Motor [kW] | Containment OEB Level | Inlet Connection | Outlet Connection | Glove Ports | L × W × H [mm] | Weight [kg] | |
| MM-HP-LAB | Lab/Pilot | 5–30 | 0.5–10 | 700–3,000 VFD | 1.5 | OEB 3–5 | SBV DN 100 | SBV DN 100 | 2 | 600×450×900 | 85 | |
| MM-HP-PIL | Pilot | 20–100 | 0.5–10 | 700–3,000 VFD | 3.0 | OEB 3–5 | SBV DN 140 | SBV DN 140 | 2 | 800×580×1,100 | 165 | |
| MM-HP-300 | Production | 80–300 | 0.5–12 | 700–3,000 VFD | 7.5 | OEB 3–5 | SBV DN 200 | SBV DN 200 | 2 | 1,050×720×1,400 | 320 | |
| MM-HP-700 | Production | 200–700 | 0.5–12 | 700–2,500 VFD | 15 | OEB 4–5 | SBV DN 280 | SBV DN 280 | 4 | 1,380×940×1,750 | 580 | |
| MM-HP-1000 | Production | 350–1,000 | 0.5–15 | 700–2,000 VFD | 22 | OEB 4–5 | RTP/SBV DN 380 | RTP/SBV DN 380 | 4 | 1,700×1,150×2,100 | 950 | |
| MM-HP-1500 | Large Prod | 500–1,500 | 0.5–15 | 700–1,800 VFD | 30 | OEB 4–5 | RTP/SBV DN 480 | RTP/SBV DN 480 | 4 | 2,050×1,400×2,500 | 1,400 | |