Biogas holder safety

18 April 2019

Biogas holder must be gas-tight, pressure-tight and resistant to the medium, to ultraviolet light, temperature and weathering (storm, snow etc.) in accordance with needs. With regard to wind and snow loads, in particular, it is essential that the manufacturer produces a design that is site-specific.

Gasholder must be connected via the gas-carrying system with overpressure and underpressure protection device. Gasholder and their equipment must be protected against mechanical damage. For vulnerable area with vehicle risk, the gasholder can be protected by collision impact protection guards, non-traversable areas, barriers or observance of a safety distance or a safety fence around the gas storage. 

If maintenance and repair measures have to be performed on single-layer or double-layer biogas storage membranes, they must not be stepped on. Any such loading (weight of an individual person) is only permissible if proof of walk-on stability has been furnished and a hazard assessment has been provided for the activities to be performed in the course of the maintenance or repair. 

The classification of ex zones at the biogas holder varies with the design. For double membrane gas holder, the space between inner and outer membrane is continuously washed by air to prevent the build-up of small concentration of biogas. Therefore the level sensor and blowers often needs to be suitable for Atex zone 2 application. The surrounding area (3m) of  air inlet and outlet are also ex-zone. 


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Palmerston North, 4410
New Zealand

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