Dual membrane gas tank for biogas plant 1.less maintenace 2.easy installation 3.volume:50-10000m3 ... with aotu-syste The semi-spherical dual membrane gas tank for biogas plant It adopts the special biogas membrane material with the ... ,700,800,900,1000,1200,2000,2500,3000 Large volume and easy control. Dual membrane gas tank for biogas plant