Refinery Pump Seal Fire: API 2218 Firesafe Pumps and Deluge

Mechanical seal fires are a frequent risk scenario in refineries and petrochemical plants. High-pressure hydrocarbon creates a jet fire — a 5-10 m tall fire column. API 2218 (Fireproofing Practices in Petroleum and Petrochemical Processing Plants) defines structural protection, pump secondary containment and deluge spray water design.

Seal Failure Modes

• Primary seal wear: dry running, abrasive fluid
• Secondary seal failure: flammable liquid escapes
• Pump cavitation: excess vibration, shaft misalignment
• Ignition: hot surface (>350 C autoignition), spark

Typical API 610 pump seal life is 3-5 years.

Firesafe Secondary Seal

• Dual mechanical seal: two primaries + barrier fluid
• API Plan 52/53: external flush + barrier fluid circulation
• API Plan 66: secondary containment + drain
• Magnetic drive pump: no seal — no leak

Deluge Spray Water

API 2218 deluge over pumps:

• Design density: 10.2 L/min/m2 (0.25 gpm/ft2)
• Area: pump + motor + isolation valve
• Nozzle: medium-velocity spray, 60 deg cone
• Activation: flame detector (UV/IR), gas detector or manual
• Water reserve: 30 min (AHJ) or 2 hours (FM Global)

Structural Fireproofing

• Structural steel: PFP (passive fire protection) - intumescent coating, 2-hour rating
• Cable tray: ablative coating or mineral wool
• Pipe support: fireproof concrete coating up to 9 m height
• ESD valve: closes on heat or smoke in 30 s

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