10 tips for winter check

Biogas plant? Let it run, run, run

1. Input system

  • Check input system regularly: Large, frozen slabs should be nowhere near the input system, as they may damage individual system components.
  • For input hoppers with lids, it should be ensured that they are properly closed, even in strong winds.

2. Over- and underpressure valve

  • A daily inspection of the sealing liquid is absolutely necessary in cold periods, to check for sufficient concentration and therefore that the area of impact is sufficient.
  • Do not use antifreeze for windshield washer systems for over- and underpressure valves. The antifreeze used must be effective down to at least -30°C. If necessary, adjust the antifreeze to the weather conditions. Ensure that there is the correct ratio of antifreeze and water according to the manufacturer‘s recommendations.
  • A sufficient mixing of the fluid inside the valve is to be ensured, as it cannot be ruled out that condensate layers on the sealing liquid might accumulate and freeze
  • It may be necessary, due to the weather, to drain the liquid, make up a new mixture, and use it to refill the system. Further information is also available in the specifications in the documentation.

3. Substrate and slurry lines, as well as sampling and urgent removal

  • Non-insulated components are to be protected from frost. Inadequate protection leads to blockages which can in turn cause failures.

4. Air compressor

  • Where there is no automatic drainage, the system must be drained more frequently, as more condensate is formed in the cold weather. Automatic drainage systems must likewise be checked on a regular basis.

5. Gas pipes including gas isolation valves

  • Check daily whether exposed gas pipes are frozen as a result of the volume of condensate. They may need to be insulated and trace-heated.

6. Trace heating and insulation

  • Regularly check that system components which are insulated or trace-heated are in a proper condition.

7. Container roof systems

  • Check that roof systems are in a proper condition; be aware of permissible roof loads in the event of heavy rain or snow.
  • Water pockets are to be avoided; also take rain aprons into consideration.

8. Roof and floor inlets

  • Roof and floor drains must be carefully examined on a daily basis, to ensure that pedestrian and vehicular surfaces are kept free of water and ice.

9. Buildings/enclosures

  • In the event of heavy frost, it should be ensured that areas which must remain frost-free are closed off.
  • In such closed-off areas, the requisite ventilation and monitoring of the ambient air should be checked.

10. Emergency and mixed cooling system

  • Check the emergency and mixed cooling system for frost resistance

11. Outdoor areas

  • Beware of loose components: They may fly around in strong winds and cause unnecessary damage to the plant.


Everything checked? Then your plant is safe for the winter! You can find the list to check off as a download below.

10 tips for the winter check of your biogas plant

Stephan Stiens

Managing Director
EnviTec Service GmbH

+49 4442 8016-7400 Contact form