What is the minimum vacuum level the machine must achieve?

The machine must be capable of creating a maximum vacuum of not less than 650 mm of mercury gauge at mean sea level (Clause 4.1).

What material and thickness are required for the debris tank?

The tank shell must be made from mild steel (conforming to IS 2062) of at least 5 mm thickness, and the end plates must be at least 6 mm thick (Clause 6.2.1).

Is a tank full indicator or safety device mandatory?

Yes, a safety device must be fitted to automatically stop the suction operation when the debris tank is full (Clause 6.2.3).

What tests are required for the machine before acceptance?

The machine must undergo a vacuum test, a performance test for suction rate, and a hydrostatic pressure test for the tank (Clause 10).

IS 13496

: 1992

General requirements of suction machine for cleaning sewers, manholes and ancillary structures provided on sewer line and closed stormwater drains

CurrentSpecializedSpecificationWater Resources · Public Health Engineering

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This standard specifies the material, construction, performance, and testing requirements for suction machines used for cleaning sewers and manholes. It covers key components like the debris tank, vacuum pump, drive system, and suction hoses, ensuring the equipment is safe and effective for municipal and public health engineering applications.

General requirements of suction machine for cleaning sewers, manholes and ancillary structures provided on sewer line and closed stormwater drains

Quick Reference Values

Minimum Vacuum Requirement650 mm of mercury gauge at sea level

Minimum Tank Shell Thickness5 mm

Minimum Tank End Plate Thickness6 mm

Minimum Suction Hose Diameter100 mm

Hydrostatic Test Pressure for Tank0.5 kgf/cm²

Practical Notes

Ensure the vehicle's Power Take-Off (PTO) unit is correctly matched with the vacuum pump's power and speed requirements to prevent damage to the engine or pump.

The selection of tank capacity should be based on the local sewer network density and typical cleaning frequency to optimize operational efficiency.

Regularly inspect the primary and secondary shut-off valves/systems to prevent sludge from entering and damaging the vacuum pump.