- 2025-07-22
Explosion-proof reverse osmosis
Design standards for water supply systems in hazardous areas
Applicable to Class I Div 1/2 zones (according to NEC 500/505 standards):
Gas group: IIA/IIB (methane to ethylene environment)
Temperature group: T3 (surface temperature ≤200℃)
Shell protection: NEMA 7 certified explosion-proof cabin (6mm steel plate welded structure)
Key design of intrinsically safe RO system
Explosion-proof technical measures:
Positive pressure purge system
Continuous injection of inert gas (nitrogen purity ≥99.99%)
Maintaining the pressure in the cabin >50Pa (preventing the infiltration of flammable gases)
Intrinsically safe circuit design
24VDC limited power supply (short-circuit energy <20μJ)
Ex ia sensor (UL 913 certified)
Sparkless transmission
Magnetic coupling high-pressure pump (isolation torque ≥850N·m)
Process parameters:
Operating pressure: 5.6±0.2MPa
Desalination rate: 99.4% (seawater TDS 35,000ppm→210ppm outlet water)
Concentrated water discharge: automatic Venturi dilution (salinity ≤4.5%)
Typical engineering cases
Offshore drilling platform project:
Explosion-proof level: Class I Div 1 Group IIB
Configuration: Dual RO units + pressure storage emergency flushing
Operation data:
• Continuous operation for 14,000 hours without failure
• Spark risk detection rate 0 times/year
Refinery and petrochemical plant brackish water treatment system:
Innovative design: membrane shell electrostatic elimination device (＜0.1μΩ)
Safety certification: ATEX/IECEx dual system certification
Core engineering value
► Intrinsic safety guarantee
Short-circuit arc energy is suppressed to below 0.03mJ
Overcurrent triple protection (response time ＜2ms)
► Regulatory compliance
Meet API RP 14F oil and gas platform specifications
Passed OSHA 1910.307 explosion-proof certification
► Extreme environment adaptability
Sulfide stress corrosion resistance (H₂S≤100ppm)
-40℃~65℃ wide temperature range operation
► Maintenance optimization
Quick-opening membrane stack module (single component replacement <15min)
Online integrity detection (<5% flux attenuation warning)
