Leakage exceeds system capacity
Cloth tears, open sectors, seals, joints, valve wear or open drains can admit excess air.
Air ingress, restriction and auxiliary diagnosis
Vacuum Disc Filter Low Vacuum and Leakage Troubleshooting
Diagnose low vacuum, air leakage and unstable filtration by checking seals, piping, valves, filtrate receivers, pumps, sector connections and cloth condition.
Confirm instrumentFirst step
Leak vs capacityDiagnostic split
Filter to pumpSystem
Isolate before workSafety
Safe diagnostic methodAir ingress Restriction Vacuum source
Verify the Reading and Define the Symptom
Record where vacuum is measured, instrument condition, operating state and whether the issue is low, unstable, zone-specific or associated with receiver level and filtrate flow.
The flow path is blocked
Flooded receivers, restricted piping, blocked sectors or condensate can isolate the pump from the filter.
Pump or control performance changed
Pump condition, seal water, speed, valves, elevation and process load affect capacity.
Safety before inspection or maintenance
Stop the equipment and isolate all hazardous energy that can cause rotation, vacuum, pressure, stored mechanical movement, electrical energization or chemical exposure. Follow the site lockout and permit procedure; inspection and maintenance must be performed only by authorized personnel.
Troubleshooting sequence1 2 3 4 5
Work from Measurement to Filter and Vacuum Source
Change one controlled variable at a time and retain the before-and-after operating evidence.
Verify instrument
Compare an approved reference and measurement point.
Define pattern
Map zone, disc, operating state and timing.
Check receiver
Review levels, carryover and liquid removal.
Locate leak/restriction
Use approved isolation and inspection methods.
Verify source
Compare pump and system performance to the basis.
Evidence to record
Build a Trend, Not a Snapshot
Use the same instruments, sampling points and laboratory method so changes can be compared.
Vacuum readingsLocation, calibrated range, trend, zone and operating state.
Filtrate systemReceiver level, pump-out, carryover, piping and valve positions.
Air leakage cluesSound, cloth damage, sector pattern, seal condition and joints.
Vacuum sourcePump status, seal water, speed, temperature and maintenance history.
Process loadSlurry level, solids, cake formation, disc speed and wash state.
Recent changesMaintenance, valve setting, piping, media, control or feed change.
Corrective-action logic
Use Symptom Pattern to Narrow the System
Never use hands, loose materials or unsafe sprays near rotating equipment to search for leakage.
| Finding | Review | Possible controlled response |
|---|---|---|
| Low everywhere | Common header, receiver, pump or major open path. | Check shared equipment and confirmed isolation points. |
| One zone is low | Valve timing, zone seal or branch restriction/leak. | Inspect the identified branch under safe isolation. |
| Vacuum fluctuates with receiver level | Liquid removal, control or carryover problem. | Restore stable receiver operation and transfer. |
| One disc or sector behaves differently | Cloth, sector, neck seal or local blockage. | Inspect the localized path and media. |
| Pump cannot reach prior baseline | Pump condition, seal water, speed or changed air load. | Compare to supplier curve and maintenance evidence. |
Continue the project path
Continue the Diagnostic Path
Use related technical and service pages to resolve the underlying cause.
Practical answers
Frequently Asked Questions
These answers support project preparation; the final recommendation depends on the actual duty.
Why is representative slurry data required?
Mineral names do not define filterability. Particle-size distribution, mineralogy, clay, reagents, solids and temperature can change cake formation, permeability and release. Use filterability testing when results matter commercially.
What should be sent for a preliminary review?
Provide dry-solids throughput, feed solids, particle-size data, target cake moisture, operating schedule, elevation and available utilities through the quote request.
Can BOYUN promise cake moisture from the mineral name alone?
No. A defensible target must be tied to representative feed data, test conditions, equipment scope and an agreed operating basis.
Define the Next Engineering Step
Share the feed, throughput, operating target and site constraints. BOYUN will identify missing information and recommend testing, sizing or the appropriate equipment scope.