Read airflow and vacuum at their stated working conditions
Vacuum describes a pressure difference; airflow describes the volume of air moved under stated conditions. Both matter when assessing pickup through a hose. Comparing maximum vacuum with free-air flow mixes values that do not describe the same installed duty.
Material, elevation, restrictions, bends and leakage affect the result. Vactor’s fan and positive-displacement options show why system type and configuration matter, but a published Vactor model cannot establish another truck’s capability.
Include the protective limits in the performance comparison
The allowed operating region can be narrower than a theoretical pickup limit. Filtration, separators, the tank, relief, temperature and drive systems must remain within their instructions. Bypassing one of these protections invalidates the comparison and introduces hazards.
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| Decision | What to establish | Condition or limit |
|---|---|---|
| Airflow | Read volume flow at the relevant operating condition. | Free-air flow is not working flow through the installed hose and material. |
| Vacuum | Use the allowed working range and relief settings for the exact system. | Maximum vacuum is not a continuous performance promise. |
| Lift and run | Evaluate vertical head, horizontal loss, bends and leakage together. | A vertical-depth number cannot be applied to every hose route. |
| Protection | Keep filtration, overflow, temperature and drive limits in the comparison. | Bypassing protection invalidates performance and creates hazard. |
Request data for the installed system and site geometry
Provide the material and full hose path, then ask for relevant operating data and allowed limits for the selected equipment. Keep vertical lift and horizontal losses together. One suction-depth number cannot describe every site or serve as a continuous-performance promise.
Information to prepare for this review
- Material and expected solids
- Vertical lift and horizontal hose run
- Hose diameter, bends and leakage controls
- Airflow and vacuum curves or test data
- Drive speed, temperature and duty limits
- Separator, filter, relief and overflow protection
Records to request and keep
- Exact vacuum-system identity and curve
- Defined hose and material test condition
- Protection, relief and operating-limit documentation
- Witnessed project test when required by the contract
Common mistakes and what to check instead
- Comparing maximum vacuum alone: Compare airflow and vacuum at the intended system condition.
- Ignoring air leakage at couplings: Include hose, seals, joints and access opening in the duty.
- Treating brochure material pickup as guaranteed: Require the stated test condition and project-specific acceptance basis.
Scope of this guide
This explanation does not produce a system curve or safe operating limit.
Only the selected manufacturer documents and qualified engineering control the equipment.
Do not operate outside relief, temperature, speed, filtration, tank or hose limits, and stop for abnormal heat, noise or vibration.
Sources and applicability
Controls the project-input, quotation, approval and inspection workflow described in this guide.
Provides public checklists and worksheets; the signed project documents remain controlling.
Defines the relevant product family and published configuration boundaries. Project-specific ratings require the selected OEM documents.
Manufacturer primary example distinguishing fan and positive-displacement vacuum systems, airflow, vacuum, hose and jetting variables. It does not rate a KEEYAK project.
Official U.S. safety reference for sewage-related hydrogen-sulfide and confined-space hazards. Applicable local safety rules and qualified procedures remain controlling.