Xylem Bell & Gossett Hoffman Speciality Series Engineering Data Manual page 44

Bucket Trap
• Discharges full capacity then shuts off.
• Muffled rattle of bucket on outer chamber.
• Violent bucket rattle & sound of rushing steam—
• lost prime.
• Clogged air vent—fails closed.
• Discharge under loads
• —Modulates under light load
• —Continuous discharge at full capacity.
INVERTED
BUCKET
TRAP
YES
CAN CYCLES
BE HEARD?
NO–
CONTINUOUS
DISCHARGE
LOAD
YES
APPROACHING
TRAP
CAPACITY?
NO
IS RUSHING
NO
STEAM SEEN
OR HEARD?
YES
REPAIR
OR
REPLACE
SHUT
YES
TIGHT GOOD
BETWEEN TRAP
DISCHARGES?
NO
IS RUSHING
NO
GOOD
STEAM HEARD
TRAP
OR SEEN?
YES
REPAIR
OR
REPLACE
PROBABLY
A GOOD
TRAP
GOOD TRAP—
BUCKET TRAPS CAN MODULATE
ON A SMALL % OF RATED CAPACITY
Disc
• Best test is sound.
• Trap cycling is audible.
• Disc slams against seat.
• Leaking seat—would be heard.
• Rapid cycle—excessive wear.
• Machine gunning—live steam.
DISC
TRAP
CHECK
SIZING
CAN TRAP
YES
PROBABLY DISCHARGE
LEAKING CYCLE
HIGH
BE HEARD?
CYCLE
RATE
NO–
CONTINUOUS
DISCHARGE
DOES TRAP
APPEAR TO
LEAK STEAM?
YES
REPAIR
OR
REPLACE
GOOD
TRAP
NO
DOES TRAP
YES
APPEAR TO
LOW LEAK STEAM?
CYCLE
RATE
YES
REPAIR
OR
REPLACE
COULD BE
NO RESPONDING
TO HEAVY
CONDENSATE
LOAD
45