Puxin bags set the standards. Here are their measurements, from
http://puxinbiogas.en.alibaba.com/product/263927194-220435925/PUXIN_biogas_storage_bag.html
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PUXIN biogas storage bag
Used to store the excess biogas every day, with 1 to 200 cubic meter capacity
Catalogue of PUXIN biogas Storage Bag
1. Biogas Storage Bag for family Size biogas plant
Type
Specification
Remark
PX-CQD-HY005
0.5M3
PVC, Size:1.5*1.2M Thickness 0.6mm
PX-CQD-HY01
1 M3
PVC, Size:1.5*2.2M Thickness 0.6mm
PX-CQD-HY02
2M3
PVC, Size:1.5*2.8M Thickness 0.6mm
PX-CQD-HY03
3M3
PVC Thickness 0.6mm
PX-CQD-HY05
5M3
PVC Thickness 0.6mm
PX-CQD-HY10
10M3
PVC Thickness 0.6mm
2. Biogas Storage Bag for medium and large size biogas plants
Type
Specification
Remark
PX-CQD-RM20
20M3
4*2.5*2.0M
PX-CQD-RM50
50M3
Size: Φ3.3*6M
PX-CQD-RM100
100 M3
Size: Φ4.0*8M
PX-CQD-RM200
200M3
Size: Φ5.0*10M
Materials:Red Mud reinforced plastics
Thickness 1.0mm. The size and shape can be customized.
I want to buy or make my own gas storage bag. I'm aware from your website that I can get them from Puxin or make them out of PVC tarp or .45 mil EPDM pond liner or roofing membrane. How big do I make them to get a known quantity of gas?