Role: Mechanical Engineer, NEXUS INFRA GROUP

At NEXUS Infra Group, I was responsible for designing and implementing mechanical systems for two large-scale residential towers:

• Problem Statement:
  High-rise residential towers required NBC 2016–compliant fire protection and HVAC systems. For the fire system, the challenge was meeting residual pressure requirements at the topmost hydrant (≈3.5 bar minimum) while accounting for high static lift, friction losses, and limited pump-room space.
• My Solution:
  • Conducted hydraulic calculations for static head, frictional losses, valve losses, and hose allowances.
  • Established pump sizing criteria as follows:
    • Hydrant / wet-riser main pump: 1,500–3,000 LPM (depending on tower height).
    • Sprinkler pump (if separate): 1,000–2,000 LPM for typical residential/light-ordinary hazard classification.
    • Combined system: sized for simultaneous governing demand (hydrant + hose allowance, or sprinkler + hose allowance).
    • Hose allowance: 250–450 LPM.
    • Jockey pump: ~20–60 LPM (≈1–3% of duty flow).
  • Determined duty head ranges considering elevation, friction, and safety margin:
    • Mid-rise towers (25–40 m): ~90–120 m.
    • Taller towers (40–60 m): ~120–140 m (with zoning/terrace boosters if higher).
  • Applied pump curve compliance checks:
    • 150% of rated flow at ≥65% of rated head.
    • Shutoff head ≈101–140% of rated head.
    • Diesel standby pump equal to largest duty pump + jockey.
  • For HVAC (Grandeur Residency), designed a VRF system for entrance offices to improve energy efficiency and user comfort (implementation ongoing).
• Key Deliverables/Outcomes:
  • Fire system achieved 5 bar residual pressure at the topmost hydrant, passed fire authority approval, and reduced installation time via modular riser spools.
  • HVAC VRF system is under installation, expected to enhance energy efficiency and provide improved thermal comfort.
  • Successfully balanced code compliance, technical performance, and constructability under site constraints.
• Visuals:
  • Pump system schematic with zoning (confidential ).
  • Flow/pressure curve validation charts.
  • Modular spool riser photos.