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Coupling Types and Use

Gul Bahar Shah
  🔧 What is a Coupling? A coupling connects two rotating shafts (driving and driven) to transmit torque. Functions include: Power transmission between shafts. Absorbing shock and vibration to protect components. Accommodating misalignment (angular, parallel, axial). Overload protection in some designs. 🛠️ Major Types of Couplings and Their Uses 1. Rigid Couplings Examples: Sleeve (muff), Split-muff, Flange. Use: When shafts are perfectly aligned. Applications: Pumps, compressors, and machinery requiring precise alignment. Risk if misused: High stress on bearings due to no flexibility. 2. Flexible Couplings Examples: Bushed pin, Oldham, Gear, Jaw, Diaphragm, Bellows. Use: Allow for misalignment and absorb vibration. Applications: Motors, generators, conveyors, HVAC fans. Benefit: Protects shafts and bearings from misalignment damage. 3. Universal Coupling Use: Transmits power between shafts at varying angles. Applications: Automotive drive shafts, industrial machine...
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Kitchen Hood Fire Suppression System

Gul Bahar Shah

 Kitchen Hood Fire Suppression System

Wet Chemical System – Design & Calculation (As per National Fire Protection Association NFPA 17A & NFPA 96) 1. DESIGN BASIS DescriptionValueProtected Area4 m × 3 m Kitchen HoodHazard TypeCommercial Cooking – Grease Fire (Class K/F)Fire Suppression SystemWet Chemical SystemExtinguishing AgentPotassium AcetateApplicable StandardsNFPA 17A / NFPA 96 / UL 300Total No. of Nozzles8 NosDischarge Duration30–40 secCylinder Capacity15 Liters 2. NOZZLE DISTRIBUTION Hood Dimensions Hood Length = 4 m Hood Width = 3 m Nozzle Arrangement LocationQuantityHood Plenum Nozzles4 NosExhaust Duct Nozzles2 NosAppliance Nozzles2 NosTotal8 Nos Design Criteria Nozzle spacing approximately 1 m Coverage as per manufacturer UL 300 listing Dedicated protection for: Fryers Cooking range Hood plenum Exhaust duct 3. AGENT DISTRIBUTION CALCULATION Formula Vn=VtotalnV_n = \frac{V_{total}}{n}Vn​=nVtotal​​ Where: VnV_nVn​ = Agent quantity per nozzle VtotalV_{total}Vtotal​ = Total cylinder capacity nnn = Number of nozzles Calculation Given: Total Agent Volume = 15 L Number of Nozzles = 8 Vn=158V_n = \frac{15}{8}Vn​=815​Vn=1.875 L/nozzleV_n = 1.875\ L/nozzleVn​=1.875 L/nozzleResult Agent Distribution per Nozzle = 1.875 Liters 4. FLOW RATE CHECK Formula Q=VtQ = \frac{V}{t}Q=tV​ Where: QQQ = Flow rate VVV = Agent volume ttt = Discharge time Calculation Given: Agent per nozzle = 1.875 L Discharge time = 35 sec Q=1.87535Q = \frac{1.875}{35}Q=351.875​Q=0.053 L/sQ = 0.053\ L/sQ=0.053 L/s5. SYSTEM PERFORMANCE REVIEW ParameterResultAgent per Nozzle1.875 LFlow Rate per Nozzle0.053 L/sDischarge Duration35 secComplianceUL 300 / NFPA 17A 6. DESIGN NOTES Automatic actuation through: Fusible links / heat detector Manual pull station System interlock shall: Shut down fuel supply Trip kitchen equipment Shut down kitchen hood supply fan Keep exhaust fan operational (as required) Nozzle caps shall be installed to prevent grease contamination. Wet chemical pipework shall comply with OEM approved installation details. Cylinder location shall be accessible for maintenance and inspection. 7. TESTING & COMMISSIONING REQUIREMENTS Hydrostatic testing of piping Functional testing of release mechanism Interlock verification Nozzle alignment inspection Authority inspection by: Dubai Civil Defence 8. CONCLUSION The proposed wet chemical kitchen hood fire suppression system is designed in accordance with NFPA 17A, NFPA 96, and UL 300 requirements. The selected 15-liter cylinder capacity and nozzle arrangement provide adequate coverage and discharge performance for the protected kitchen hood and cooking appliances.

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