H₂S (Hydrogen Sulfide) – Explosion Hazards ✅ Definition: Hydrogen sulfide is a toxic, flammable gas commonly found in oil & gas, sewage, and confined spaces. ⚠️ Explosion Hazard: 🔥 Flammable Range: Lower Explosive Limit (LEL): ~4.3% Upper Explosive Limit (UEL): ~46% 👉 Within this range, H₂S can ignite and explode if there is a spark or heat source. 🎯 Why It Is Dangerous: Highly flammable gas Can form explosive atmosphere Ignites easily from: Sparks Static electricity Hot surfaces ⚠️ Additional Risks: Extremely toxic (can cause death) ☠️ Heavier than air → accumulates in low areas Rotten egg smell (but smell disappears at high concentration ❌) 🛡️ Control Measures: 1️⃣ Gas Detection Continuous H₂S monitoring 2️⃣ Ventilation Prevent gas accumulation 3️⃣ Eliminate Ignition Sources No smoking 🚭 Use explosion-proof equipment 4️⃣ Permit to Work Especially in confined spaces 5️⃣ Use PPE Respirators / SCBA if required 6️⃣ Emergency Preparedness Evacuation plan Rescue team ready ...
HVAC Information
Heat Load Calculation
Formula: Q = Area (sq.ft) x Heat Load Factor (BTU/hr per sq.ft) Example: 500 sq.ft office: Q = 500 x 30 = 15,000 BTU/hr TR = 1.25 CFM Calculation Formula: CFM = Sensible Heat (BTU/hr) / (1.08 x Delta T) Example: 12,000 BTU/hr, Delta T = 20°F CFM = 556 → AHU / FCU Sizing Rule: 1 TR = 400 CFM Duct Sizing Heat Load Calculate Velocity Limits: Main: 1400-1800 FPM 800 CFM @ 1000 FPM 0.8 sq.ft 14"x10" Chilled Water Flow Rate Formula: GPM = BTU/hr/ (500 x Delta T) Example: 24,000 BTU/hr GPM = 4.8 Pipe Sizing Chiller Sizing Formula: TR = BTU/hr / 12,000 Example: 60,000 BTU/hr 5 TR Cooling Tower Sizing Rule: Heat Rejection = 1.25 x Load 10 TR → Tower = 12.5 TR 😊
Comments
Post a Comment