Decide whether the job includes loosening material in a sewer
Suction-only equipment serves a defined pickup duty for suitable pumpable waste. A combination sewer cleaner adds water jetting, with its own clean-water supply, hose, nozzle, controls and service requirements. Those functions need separate entries in the specification.
The additional system also changes payload. Clean water, recovered waste and installed equipment must fit the completed vehicle’s mass and axle limits. Do not assume that both tanks can be full together simply because their volumes appear in the brochure.
Specify collection and pipe cleaning as separate jobs
A vacuum sewage truck uses a hose to collect compatible pumpable waste. A jetting-vacuum truck also carries a water-jetting system for a defined cleaning task. The latter adds pipe-cleaning capability, but the equipment alone cannot guarantee removal of every blockage. Describe the waste, pipe condition and disposal route before choosing between them.
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| Requirement | Vacuum-only collection | Jetting-vacuum cleaning |
|---|---|---|
| Main task | Remove compatible pumpable contents | Clean the specified pipe and collect resulting material |
| Tank allocation | Usable waste volume and permitted load | Separate usable clean-water and waste volumes, including any changing partition arrangement |
| Vacuum system | Airflow, vacuum limit, hose bore, length and vertical lift | The same suction checks remain necessary |
| Water system | Only the washing equipment explicitly included | Pump flow and pressure at the working condition, reel, hose and approved nozzles |
| Acceptance | Agreed collection demonstration and records | Separate collection and jetting demonstrations under the agreed procedure |
Use pump curves and hose specifications for the installed equipment. Maximum pressure alone does not show the flow available at the nozzle, and nominal tank volume does not show the legal waste load. High-pressure work requires trained operators following the equipment instructions.
Compare the two systems against the actual jobs
Vactor’s configurations illustrate why airflow, vacuum, hose and jetting variables need individual review; their published performance does not establish a KEEYAK rating. More equipment is useful only if the work requires it and the fleet can operate and maintain both systems.
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| Decision | What to establish | Condition or limit |
|---|---|---|
| Primary task | Use suction-only for defined pickup and combination equipment for required line cleaning. | One truck type does not cover every waste and blockage. |
| Water system | Define pressure, flow, hose, nozzle and refill for jetting duty. | High pressure without a controlled nozzle and procedure increases risk. |
| Payload split | Calculate clean water, recovered debris, equipment tare and axle loads. | Two tank volumes cannot both be assumed full without a load-case check. |
| Operation | Match controls, exclusion, communication and emergency response to both systems. | Vacuum training alone does not qualify high-pressure jetting work. |
Define the cleaning duty and simultaneous load cases
List the intended pickup and line-cleaning work, water refill arrangements and recovered-material conditions. Ask for the controls, exclusions and service scope of each system. Vacuum training alone does not qualify an operator for high-pressure jetting.
Information to prepare for this review
- Septic pumping or sewer-cleaning task list
- Pipe size, length, blockage and access points
- Vacuum hose and jetting hose geometry
- Clean-water source and refill cycle
- Recovered material and disposal route
- Crew training and high-pressure safety controls
Records to request and keep
- Task and blockage definition
- Vacuum and jetting system data at stated conditions
- Clean-water and debris load-case calculation
- Functional and safety-system acceptance records
Common mistakes and what to check instead
- Assuming combination equipment always improves productivity: Compare actual tasks, refill, setup, payload and maintenance.
- Using jetting pressure as a cleaning guarantee: Specify nozzle, flow, pipe, blockage and procedure.
- Adding clean-water volume without an axle study: Calculate credible simultaneous tank and debris cases.
Scope of this guide
This comparison does not prescribe sewer-cleaning pressure, nozzle or procedure.
Qualified operators and local waste and safety rules control field use.
Do not jet or vacuum with unknown line condition, unsafe atmosphere, damaged hose, uncontrolled pressure or inadequate exclusion controls.
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.