What are they used for?

Vacuum units are used to evacuate the air contained in the needle felt of the liner.

This step is necessary to allow the resin to readily penetrate into the pores of the needle felt and wet the entire structure to ensure bubble-free resin impregnation of the liner.

Why is it important?

If not evacuated remaining air in the impregnated liner material will end up in bubbles which leave unwetted and unsaturated areas (dry spots). These dry parts of the liner will be a serious weak point for the whole installation work:

The incorrect impregnated liners will after installation and curing not fully restore and meet the structural and hydraulic requirements for the future life cycle of the pipe. The pipe will be vulnerable against infiltration and exfiltration and every other external loads.

An indispensable tool when details matter

In order to acchieve high quality results according to the technical requirements the vacuum unit is an indispensible tool for all trenchless pipe rehabilitation methods that work with liner and resin.

• epros® vacuum units are mobile units
• can be used both on the job site and inside
• electrically driven or manually operated