SOP: DRAFT TUBE AIR ADMISSION
SOP-HYD-005 REV 2.1

DRAFT TUBE AIR ADMISSION

Vibration Mitigation & Cavitation Buffering Logic

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THE INVISIBLE BUFFER

We cannot stop the physics of low pressure, but we can cushion the blow. Introducing atmospheric air makes the water "spongy" (aerated), absorbing the shockwave of imploding cavitation bubbles.

VORTEX ROPE CONTROL

At partial loads (40-60%), an unstable vacuum core forms in the draft tube. Snifter valves admit air into this core to break the vacuum and dampen low-frequency resonance.

DIAGNOSTIC SIGNALS

  • "ROCK CRUSHING" Severe Cavitation
  • "CHUGGING" Vortex Surge (Rough Zone)

SNIFTER VALVE MAINTENANCE

01
CLEAN & LUBRICATE:

Disassemble top cap. Wash the spring in solvent. Wire-brush the seat to remove rust/scale.

02
VERIFY MOVEMENT:

The piston/ball must move smoothly and spring back instantly. Debris in air mesh is a common failure point.

Visual Rule: If the valve makes a distinct "hissing" sound at partial load, it is breathing. Silence indicates a seized valve or blockage.