HVAC engineers

Hydrotest in HVAC Systems (AHU & Chiller Piping) Hydrostatic testing is a critical step in HVAC commissioning to ensure strength, safety, and leak-free operation of chilled water systems before insulation and startup. Why Hydrotest ? Detects leakage in joints, valves & welds Verifies piping strength under pressure Ensures long-term system reliability Key Standard: Test Pressure = 1.5 x Working Pressure (Example: 6 bar → 9 bar) Where It's Applied? Chilled water piping (CHW supply & return) AHU coil connections Headers, risers & valve sections Basic Procedure: 1. Line preparation & flushing 2. Filling with water (air removal is critical) 3. Gradual pressurization 4. Pressure holding (2-24 hrs) 5. Inspection for leakage & pressure drop Common Mistakes to Avoid: Air trapped inside pipeline Sudden pressurization Not isolating AHU/Chiller Using uncalibrated gauges Final Step: Proper documentation & consultant approval A successful hydrotest ensures your HVAC s...