Biogas Safety first!

4. Requirements for the digester..................................................................................... 35
5. Requirements for the gas storage tank......................................................................... 37
6. Requirements for wooden roof structures in gas storage systems..................................... 39
7. Requirements for installation rooms for gas storages..................................................... 40
8. Requirements for substrate-carrying parts of the biogas plant......................................... 41
9. Requirements for gas-carrying parts of the biogas plant................................................. 42
10. Requirements for condensate traps........................................................................... 43
11. Requirements for overpressure and underpressure protection devices............................ 44
12. Requirements for gas purification.............................................................................. 45
12.1. Internal desulphurisation through the supply of air to gas spaces in the digester.... 45
12.2. Internal desulphurisation through the addition of iron compounds....................... 45
12.3. Desulphurisation by means of ferrous materials or activated carbon
in external facilities....................................................................................... 45
13. Requirements for gas analysis.................................................................................. 46
14. Requirements for fittings and safety devices exposed to gas......................................... 47
15. Requirements for gas flares...................................................................................... 47
16. Requirements for process control system/instrumentation and control (I&C) system........ 48
17. Requirements for electrical engineering..................................................................... 49
17.1. Equipotential bonding.................................................................................... 49
17.2. Protective measures in the event of a power outage............................................ 50
18. Requirements for lightning protection........................................................................ 52
19. Requirements for rooms with substrate-carrying and / or gas-carrying plant parts............. 52
Inspections and tests........................................................................................................ 54
Upgrading of biogas to biomethane..................................................................................... 55
Recommendations for safe plant operation........................................................................... 58
1. Recommendations for the legal framework................................................................... 59
2. Training in the industry.............................................................................................. 59
Annexes........................................................................................................................... 60
Annex 1: Hazard assessment.......................................................................................... 60
Annex 2: Instruction record for subcontractors and employees for maintenance,
installation and repair work............................................................................... 61
Organisations................................................................................................................... 64
References....................................................................................................................... 66
Credits............................................................................................................................ 67
3