A 4-5 m3 sewage suction truck is a compact vacuum truck configuration for collecting wastewater, sludge, septic waste and similar liquid or semi-liquid material. It is commonly considered where site access, local road conditions or a moderate daily collection volume make a larger vacuum tanker unnecessary.
This guide is a reference configuration rather than a fixed universal specification. The final chassis, tank material, pump drive and options should be confirmed for the destination market, operating medium and local compliance requirements.
Reference 4-5 m3 sewage suction truck configuration
| Item | Reference configuration |
|---|---|
| Tank capacity | 4-5 m3 |
| Reference wheelbase | Approx. 3,300 mm |
| Tank material | 6 mm Q235B carbon steel with internal reinforcement |
| Tank working condition | Positive pressure 0.2 MPa; negative pressure -0.1 MPa |
| Standard vacuum pump | Rotary vane vacuum pump, 68 L/s airflow, up to 92% vacuum |
| Standard suction depth | Up to 8 m vertical suction under suitable working conditions |
| Suction and discharge ports | DN100 suction port and DN100 discharge port at the rear tank head |
| Suction hose | One DN100 hose, 8 m reference length |
| Tank operation | Hydraulic tank lifting and hydraulic rear-door opening |
Tank body and access features
The reference tank uses 6 mm Q235B steel plate with internal reinforcement. A top guardrail, ladder and side platforms support access and hose handling. Three inspection windows on the rear tank head help the operator observe the suction condition and reduce the risk of unnoticed blockage during operation.
For unloading and cleaning, the tank can be raised by an underbody hydraulic cylinder at an angle of at least 45 degrees. The hydraulic rear door opens to at least 60 degrees. Two manual locking hooks are used on this compact configuration.
The tank interior can be finished with epoxy anti-corrosion coating, followed by an external anti-corrosion topcoat. Tank material and coating should always be reviewed against the actual waste medium, especially where the liquid is corrosive or chemically aggressive.
Standard rotary vane vacuum pump option
The standard configuration uses a rotary vane vacuum pump with 68 L/s airflow and a stated vacuum level of up to 92%. It is suitable for routine sewage, septic and sludge collection where the operating conditions fit the pump's application range.
The vacuum system includes primary and secondary overflow protection, as well as water-vapor and oil-gas separation. These components help protect the vacuum pump and support steadier work during normal collection operations.
The stated vertical suction depth is up to 8 m. Actual suction performance depends on hose diameter and length, material density, lift, temperature, altitude and the condition of the vacuum system. It should therefore be treated as a reference, not a guaranteed result for every job site.
Optional water ring vacuum pump system
A water ring vacuum pump system can be selected where the operating medium or working method calls for it. The reference option uses an SK-9 water ring vacuum pump driven through the side PTO, with approximately 450 m3/h airflow and a stated vacuum level of up to 93%.
This option includes a water-cooling circulation system, an independent circulation water tank, four-way valve, piping and overflow protection. Under reference conditions using water as the medium, the tank filling time is stated as no more than five minutes. Real filling time will vary with the material being collected and the working setup.
There is no single best vacuum pump for every buyer. A rotary vane pump and a water ring pump should be chosen according to the material, duty cycle, maintenance preference, local water availability and the required suction performance.
Suction, discharge and hydraulic operation
The rear tank head is configured with a DN100 discharge port and a DN100 suction port. A buffer plate inside the suction port helps reduce the direct impact of incoming debris on the tank body.
The truck provides self-suction and self-discharge functions through a fully sealed pressure tank. Its hydraulic system includes a hydraulic oil pump, integrated multi-way control valve, oil tank and filtration. The hydraulic system operates tank lifting and rear-door opening and closing in a controlled manner.
Useful optional equipment
Depending on the buyer's operation and market requirements, the following options can be considered:
- Aluminum-alloy side protection and anti-slip platform plates
- 20 L hand-washing water tank
- Stainless-steel ladder, guardrail and rear discharge tailboard
- Combined flexible and rigid hydraulic oil lines
- Corrosion-resistant exterior paint specification
Options should solve a real operating or compliance requirement, rather than being added simply because they are available.
Who should consider a 4-5 m3 vacuum truck?
A 4-5 m3 sewage suction truck may suit municipal service contractors, septic service operators and facility-maintenance teams that work on narrower roads or need a compact vehicle for routine collection work. Buyers handling dense industrial sludge, deeper suction points or higher daily volumes may need a larger tank or a higher-capacity vacuum system.
For a wider overview of the product family, see our Sewage Suction / Vacuum Truck page. Buyers comparing capacity ranges can also review How to Choose Vacuum Truck Tank Capacity for Sewage, Sludge and Jetting Work.
FAQ
Is a 4-5 m3 sewage suction truck suitable for septic service?
It can be suitable for routine septic and wastewater collection where the access conditions and daily collection volume match a compact tank. The final choice should consider waste density, travel distance, disposal frequency and local weight limits.
What is the difference between a rotary vane pump and a water ring vacuum pump?
They use different operating principles and have different maintenance and working-condition considerations. The correct choice depends on the material being collected, expected duty cycle, local service support and the desired vacuum system arrangement.
Can the tank and pump be customized?
Yes. Tank capacity, chassis selection, coating, pump system, safety equipment and regional compliance items can be reviewed before production. Contact CLW Group with your operating medium, required capacity, destination country and preferred chassis requirements.