沼气脱硫工程施工离不开管道的安装！主要有以下几个方面:
The installation of pipeline is indispensable to the construction of biogas desulfurization project. There are mainly the following aspects:
1、沼气站外供气管道，须由有燃气设计资质的单位提供施工图和设计文件，并经过技术交底和会审批准后，方可由有燃气管道施工资质单位安装施工。
1. Gas supply pipelines outside biogas stations shall be provided with construction drawings and design documents by units with gas design qualifications, and shall be installed and constructed by units with gas pipeline construction qualifications only after technical submission and approval by the conference.
2、管道组成件及阀门等必须有制造厂家的质量合格证明书。其材质规格和型号须符合设计文件规定；施工单位要按设计文件核对阀门型号。并按介质流向确定阀门的安装方向；阀应垂直安装，安装前必须由安检部门对其限压进行校验。使阀门开启和回座压力符合设计文件要求，并出具校验合格的报告证书。
2. Pipeline components and valves must have the quality certificate of the manufacturer. The material specifications and models shall conform to the design documents; the construction units shall check the valve models according to the design documents. The installation direction of the valve should be determined according to the flow direction of the medium; the safety valve should be installed vertically, and its safety pressure limit must be checked by the safety inspection department before installation. Make the valve open and return pressure meet the requirements of design documents, and issue a certificate of qualified verification report.
3、管道安装应该做到横平竖直，室内管道沿墙(粱)安装支固，室内横管道应以3%的坡度坡向立管方向；室外管道多采用埋地方式，埋深在冻层以下，同时管顶的覆土厚度还应符合下列要求：行车道下的覆土厚度不小于0.9m，非行车道下的覆土厚度不小于0.6m；庭院内的覆土厚度不小于0.3m；水田地下的覆土厚度不小于0.8m；在管道低点或相隔一定距离要设凝水器，管道要以1‰的坡度坡向凝水器，埋地管道在试压合格并采取防腐处理后，应及时回填土；燃气管路不可与其它管线埋在同一地沟内。
3. Pipeline installation should be horizontal and vertical. Indoor pipes should be installed and supported along the wall (sorghum). Indoor pipes should be in the direction of vertical pipes with a slope of 3%. Outdoor pipes are mostly buried under the frozen layer. At the same time, the thickness of soil cover on the top of pipes should meet the following requirements: the thickness of soil cover under the lane is not less than 0.9m, but not feasible. The thickness of the overlying soil under the lane is not less than 0.6m; the thickness of the overlying soil in the courtyard is not less than 0.3m; the thickness of the overlying soil under the paddy field is not less than 0.8m; the condensator should be installed at the low point of the pipeline or at a certain distance between the pipelines, the pipeline should be gradient to the condensator with a gradient of 1, and the buried pipeline should be back-filled in time after qualified pressure test and anti-corrosion treatment; Gas pipelines should not be buried in the same ditch as other pipelines.
4、、钢制管道，特别是埋地的钢制管道，须做好防腐处理，钢制管道焊接部件应在试压合格后进行防腐处理；钢制管道在穿墙或穿过楼板时，应加装套管，穿墙套管长度不小于墙的厚度；穿楼板套管的上端应高出楼板地面50mm；套管内不宜有焊缝，有缝管的纵向焊缝应置于易检修的方位。
4. Steel pipelines, especially buried steel pipelines, should be well anticorrosive treatment, steel pipeline welding parts should be anticorrosive treatment after qualified pressure test; steel pipelines should be installed casing when passing through walls or floor slabs, the length of casing through walls should not be less than the thickness of the wall; the upper end of casing through floor slabs should be 50 mm higher than the floor floor floor floor; There should be no weld in the casing, and the longitudinal weld of the welded pipe should be placed in the position of easy maintenance.
5、PE管道热弯时，加热温度应控制在130～150℃，加热长度应大于弯管弧长；PE管材进行热加工时，应当一次成型，不宜再次加热；PE管道安装后应进行水压或气压试验。试压过程中不能敲击管子，要轻缓开启和关闭阀门。
5. When PE pipes are hot-bended, the heating temperature should be controlled at 130-150 C, and the heating length should be longer than the arc length of the elbow. When PE pipes are hot-worked, they should be formed once and not reheated again. After installation of PE pipes, water pressure or air pressure tests should be carried out. In the process of pressure test, the pipe should not be tapped, and the valve should be opened and closed slowly.
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2019-09-16
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