SOP: HIDDEN GUARDIANS | FRANCIS UNIT 1
SOP-PROT-013 REV 2.1

HIDDEN GUARDIANS PROTECTION

BACK TO DASHBOARD

THE INVISIBLE RISK

Hidden components like the nose cone, snifter valves, and internal relief channels prevent catastrophic failure but are often ignored due to access difficulty.

NOSE CONE

Manages turbulence at draft tube exit. Loose bolts cause vib-fatigue.

SNIFTER VALVE

Prevents vacuum collapse during load rejection. Stiction = head cover failure.

SILT DRAINS

Removes heavy sediment from spiral casing. Silt = efficiency loss.

PROTOCOL: VACUUM BREAKER

FUNCTIONAL TEST (ANNUAL)

  • Manual Actuation: Disc must move freely by hand.
  • Seating: Disc must drop with audible "clunk".
  • Airtightness: No hissing during pressurized standby.