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Understanding their differences is crucial for professionals involved in construction and infrastructure projects.

Gul Bahar Shah
  While Quality Assurance (QA) and Quality Control (QC) are frequently used together in civil engineering, they represent distinct processes. Understanding their differences is crucial for professionals involved in construction and infrastructure projects. Quality Assurance (QA) is process focused. It is about planning the right systems before work starts. This includes approved method statements, inspection and test plans, checklists, and procedures. The goal is to prevent defects by setting the correct process from the beginning. Quality Control (QC) is product focused. It is about checking the actual work and materials on site. It includes inspections, site tests, material tests, and workmanship checks to confirm everything meets drawings and specifications. Simple way to remember it: QA= Plan and prevent mistakes QC=Check and correct mistakes Strong QA reduces the number of QC issues. Both are essential for safe, compliant, and high-quality project delivery. Activate to view la...
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Fire Pump Pressure Setting — NFPA 20 (Old vs 2025 Edition)

Gul Bahar Shah

  Fire Pump Pressure Setting — NFPA 20 (Old vs 2025 Edition)

Accurate pressure sequencing between the Jockey Pump and Fire Pump(s) is critical for a reliable fire protection system and prevents unnecessary cycling of the main pump.
The NFPA 20 (2025 edition) — Standard for the Installation of Stationary Fire Pumps for Fire Protection — has updated the recommended pressure differential between Jockey Pump and Fire Pump operations:
Old editions: 5 psi difference
2025 edition: 10 psi difference
Benefits of this change:
• Prevent frequent start/stop cycles
• Improve system stability
• Extend equipment life
Example Case
• Fire Pump Capacity: 1000 GPM
• Static Pressure (City Supply): 50 psi
• Churn Pressure (Fire Pump): 115 psi
Calculated Pressure Settings:
Jockey Pump Stop Point = Churn Pressure + Static Pressure = 115 + 50 = 165 psi
Pressure Settings Comparison
Old Edition (5 psi difference)
Jockey Stop: 165 psi
Jockey Start: 160 psi
Electric Fire Pump Start: 155 psi
Diesel Fire Pump Start: 150 psi
Fire Pump Stop: 165 psi
New Edition (NFPA 20: 2025 — 10 psi difference)
Jockey Stop: 165 psi
Jockey Start: 155 psi
Electric Fire Pump Start: 145 psi
Diesel Fire Pump Start: 135 psi
Fire Pump Stop: 165 psi
Additional NFPA 20 Guidance (Section A.10.5.2):
• Differential between jockey pump and fire pump start pressures: ~10 psi (0.68 bar)
• Minimum Run Time: 10 minutes or until manually stopped
• Pressure Switch Accuracy: Calibrate based on actual gauge readings
• Multiple Pumps: Maintain ~10 psi spacing between start points

✨ Sharing & Learning Together ✨
NFPA20 2025Edition MA_Fire_Protection_Engineering

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