Silo Dust Collector Factory Acceptance Test (FAT) Guide
A practical FAT plan for verifying silo dust collector construction, dimensions, pulse cleaning, controls, coating and documentation before shipment.
A factory acceptance test, or FAT, is the buyer's last structured opportunity to confirm that the dust collector matches the approved specification before packing and shipment. It should verify identity, workmanship, dimensions, components, controls and functional operation. It should not be reduced to a few photographs or an unloaded motor run.
What is a factory acceptance test for a silo dust collector?
A factory acceptance test (FAT) is an inspection carried out at the manufacturer's works before shipment, against a specification agreed in advance. Its purpose is to catch problems while they can still be corrected in the workshop rather than at height on a silo roof in another country.
A FAT is only meaningful if there is an agreed standard to test against. Without documented filter area, materials, element specification and electrical requirements, an inspection can confirm that the unit exists but not that it is correct.
What should be verified?
| Item | What is checked | Why it matters at this stage |
|---|---|---|
| Filter area | Element quantity and dimensions against the agreed area | The primary performance parameter; cannot be changed later |
| Flange dimensions | Measured against the silo drawing | Mismatch is discovered at installation otherwise |
| Body material and thickness | Material certificates; measured thickness | Not verifiable once painted and shipped |
| Element type and media | Markings and documentation | Media substitution is not visible from outside |
| Cleaning system | Valve count, blow-pipe alignment, nozzle positions | Alignment errors cause wear and uncleaned rows |
| Electrical build | Voltage, frequency, components, protection rating | Rebuilding on site is impractical |
| Surface treatment | Preparation and coating specification | Determines corrosion life |
| Welds and seals | Visual inspection, tube sheet integrity | A leaking tube sheet bypasses filtration |
Which checks are worth the most?
Two checks catch the majority of significant problems:
- Count and measure the elements. Filter area is the parameter that determines performance and price, and it is verifiable simply by counting elements and measuring one. It is also the parameter most likely to differ from the quotation.
- Measure the flange. A dimension check against the silo drawing takes minutes at the works and prevents the most expensive category of site problem.
Both are physical measurements rather than document reviews, and neither requires specialist equipment.
What can be functionally tested at the works?
- Cleaning sequence operation, with every valve firing in order
- Controller settings and sequence coverage
- Solenoid operation at the specified control voltage
- Blow-pipe alignment over each element position
- Door and access panel fit and seal condition
Filtration performance itself cannot be meaningfully demonstrated at a works test, because the actual dust, temperature and venting rate are not present. A works test verifies build conformity and mechanical function, not filtration efficiency.
What should be agreed before the test?
- The specification the unit is being tested against, in writing
- Which items will be measured and which will be verified by document
- Who attends and who signs
- How non-conformities are recorded and resolved
- Whether shipment is conditional on acceptance
- Which documents are handed over at the test
- Whether photographs are permitted and expected
Frequently asked questions
What is the point of a factory acceptance test?
To identify problems while the unit is still in the workshop, where correction is straightforward, rather than after it has been shipped and lifted onto a silo. It is only meaningful when there is an agreed written specification to test against.
Which single check gives the most value?
Counting and measuring the filter elements to confirm the filter area. It is the parameter that governs both performance and price, it is the one most likely to differ from the quotation, and it is verifiable with a tape measure.
Can filtration efficiency be tested at the factory?
Not meaningfully. The actual dust, temperature and venting rate are not present at a works test. A FAT verifies build conformity and mechanical function; filtration performance is confirmed in service.
What should be measured rather than accepted on paper?
Filter element quantity and dimensions, flange dimensions and bolt pattern, and body plate thickness. These are physical checks that take little time and catch the most expensive categories of error.
Do I need to attend in person?
Attendance gives the most confidence, but a documented inspection with photographs and measured records against an agreed specification can serve where travel is impractical. What matters is that the specification is agreed beforehand.
What happens if something fails the test?
That depends on what was agreed in advance — how non-conformities are recorded, who resolves them, and whether shipment is conditional on acceptance. Agreeing this before the test avoids a dispute at the point it is discovered.