Istanbul Basaksehir, Ankara Bilkent and Mersin City Hospitals are thousands-of-beds mega-complexes that use EO (ethylene oxide) to sterilize surgical kit. 100 percent EO is explosive with LEL 2.6 percent. NFPA 55 requires 30+ ACH, Class I Div 2 wiring and deluge sprinkler in EO rooms.
Ethylene Oxide
- Flash point: -18 C Class IA
- LEL-UEL: 2.6-100 percent (self)
- Autoignition: 429 C
- Molar mass: 44 g/mol
- TLV: 1 ppm TWA
NFPA 55 Classification
- Sterile room: Class I Div 2
- Cylinder area: Div 1
- Ventilation: 30 ACH
- Emergency vent: 100 ACH leak
- Detector: IR 1 ppm
Sterile Cycle
- Temperature: 37-63 C
- RH: 40-80 percent
- Concentration: 450-1,200 mg/L
- Duration: 1-6 h
- Post aeration: 12-24 h
Fire Protection
- Deluge sprinkler: 12.2 L/min/m2
- Sterilizer: CO2 no water
- Abatement: Catalytic oxidation
- Scrubber: Water wash
- Nitrogen purge: Cylinder transfer
Historic Events
- Sterigenics Willowbrook 2019: EPA shutdown
- BD Columbus 2020: EO emission
- Istanbul Basaksehir CH: 2,680 beds
- Ankara Bilkent CH: 3,711 beds
- FDA guidance: EO alternative H2O2
MEP Calc — 86+ Engineering Calculators
MEP Calc bundles 86+ engineering modules in one iOS app: 21 fire calculations (sprinkler, fire pump, FM-200 clean agent) plus heating, cooling, HVAC, plumbing, steam and natural gas. Download it on the App Store.
Download MEP Calc on the App Store
SprinkCalc — Fire Sprinkler Design Across Three Standards
SprinkCalc covers hazard classification, design density and area, K-factor selection, water demand and hydraulic calculations for NFPA 13, FM Global and BS EN 12845 in a single iOS app, and exports a professional PDF report. One of the few tools that unifies all three major fire protection standards.
Download SprinkCalc on the App StoreNFPA 55, NFPA 99, ANSI AAMI ST41, EPA NESHAP, FDA 510(k). NFPA 55 Compressed Gases and Cryogenic Fluids.