GB4750—84标准图集中对进出料管的设计、安装角度规定十分明确。但实际推广工作中,由于各地施工方法不一,特别是圆筒形沼气池出料管上下端呈“匚”形,不仅现浇制作困难,安装时如方法不当,掌握不严,还会造成与水平的夹角过小,于是下端上侧翘起,池内的发酵、贮气间最低液位面无形中抬高,贮气容积显著减少。据计算,一个6m~3的池子,如出料管下端上测抬高10cm, GB4750-84 standard diagram of the access to the design and installation of pipe provisions are very clear. However, the actual promotion work, due to the different construction methods around, especially the cylindrical digester discharge tube was “U” shaped at the upper and lower ends, not only difficult to cast in place, such as improper installation, lack of control, will result And the horizontal angle is too small, so the lower end of the upper tilt, the fermentation tank, the lowest level of gas storage tank virtually raised, the storage volume decreased significantly. It is calculated that a 6m ~ 3 pool, such as the lower end of the discharge pipe measured elevation 10cm,