(1) The water supply and gas pipeline projects shall be constructed in accordance with the design documents and construction drawings, and the ductile iron pipes and fittings shall comply with the provisions of the current relevant product standards GB1329 uniform or the current international standard (ISO 2531), and shall have the factory certificate. The pipes used for drinking water shall be made of materials that shall not pollute the water quality. The construction of water supply and gas transmission pipeline projects shall comply with relevant local laws and regulations, and the acceptance inspection of projects shall conform to the provisions of relevant standards (2) Before the construction of the water supply and gas pipeline project, the design unit should disclose the design, and the well should conduct investigation and research according to the construction needs, and master the following conditions and information along the pipeline. (3) Site topography, landforms, buildings, various pipelines and other facilities. (4) Engineering materials, hydrogeology, engineering land and construction water, drainage conditions, power supply conditions, etc. (5) Supply conditions of engineering materials and construction machinery. (6) When constructing in the surface water body or on the shore, the hydrological and shipping data of the surface water should be mastered; During construction in cold areas, information on freezing and flowing ice of surface water should be mastered. (7) Other information and data combined with engineering characteristics and site conditions. (8) To be drained should be prepared drainage construction design, construction drainage should consider drainage does not affect traffic, does not damage roads, farmland, river banks and other structural buildings and a series of drainage problems involved.
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