How a Tumblast Shot Blasting Machine Works: The Four Systems That Matter
[By Wang, Engineer & Technical Director]
When purchasing a tumblast shot blasting machine, specifications such as batch capacity, blast wheel power and cycle time are usually confirmed during the selection stage. Before delivery, however, buyers also need to verify whether the completed machine performs as agreed.
Factory acceptance testing, commonly referred to as FAT, connects the technical agreement with the actual machine. A useful FAT should examine cleaning results, operating functions, safety controls and delivery documents under defined test conditions.
1. Define the Test Conditions
Cleaning results cannot be evaluated properly without recording how the test was conducted. Before testing, the supplier and buyer should confirm:
- test-part material, dimensions and initial surface condition;
- batch weight and loading method;
- abrasive type and operating mix;
- blasting time;
- inspection method and acceptance criteria.
Where possible, the test should use the buyer’s actual parts or representative samples. This produces more meaningful results than running the machine without a realistic production load.
2. Evaluate the Cleaning Results
Acceptance should be based on an agreed cleaning target rather than a general description such as “remove rust and scale.” Depending on the application, the inspection may cover:
- removal of rust, scale, sand or other contaminants;
- cleaning uniformity on accessible surfaces;
- residual material in holes or recessed areas;
- comparison with an approved reference sample;
- part damage or deformation caused by tumbling
Workpiece suitability and belt selection should be confirmed during equipment selection rather than repeated during FAT.
3. Check Operating and Safety Functions
The FAT should demonstrate that the main machine systems operate in the correct sequence. Buyers should check the loading and unloading process, blast wheel operation, abrasive circulation, dust extraction, alarms and fault indications.
Safety checks should include:
- loading-door interlocks;
- emergency-stop devices;
- guards and access panels;
- maintenance access controls;
- start-up and shutdown interlocks.
These functions should be tested rather than confirmed only by visual inspection.
4. Review Noise and Dust Extraction
Noise can vary with the workpiece, batch load, belt material, abrasive and workshop environment. If a noise limit has been agreed, the operating condition and measurement position should also be recorded.
The dust extraction system should be checked for airflow, filter configuration, duct connections and exhaust requirements. Destination-market emission requirements should be identified separately because they may differ from the manufacturer’s standard configuration.
The blast wheel has its own national standard, GB/T 32567-2016, and ATHI is one of its drafting parties — so the key figures for this part can be checked against a reference, not just taken on a supplier’s word. ATHI also holds patents on the wheel (e.g. CN 2021203669179).
5. Confirm the Delivery Documents
The documentation should correspond to the actual machine supplied, particularly when the equipment is partly dismantled for export shipment. Typical documents include:
- general arrangement and foundation drawings;
- electrical diagrams;
- operating and maintenance manuals;
- FAT records;
- packing and component identification lists;
- spare-parts recommendations;
- installation and commissioning instructions.
How Standards Support the Review
Technical standards can provide a common reference for equipment evaluation. JB/T 5360-2017 covers technical requirements and inspection provisions for tumble belt shot blasting machines, while ISO 23779:2024 addresses safety and environmental requirements for shot blasting machinery.
However, listing a standard number in a quotation is not sufficient. The relevant requirements should be converted into machine-specific acceptance criteria, test procedures and supporting records.
ISO 23779 also does not replace CE conformity assessment, local electrical codes, emissions requirements or other mandatory regulations in the country of installation.
Conclusion
A well-defined FAT helps both parties verify the machine against the technical agreement before shipment. The review should focus on actual test conditions, cleaning results, operating and safety functions, noise, dust extraction and delivery documents.
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