（一）、金属管端法兰盘与金属管道连接应符合金属管道法兰连接的规定和设计要求。
(1) The connection between the metal pipe end flange and the metal pipe shall conform to the requirements and design requirements of the flange connection of the metal pipe.
（二）、 聚乙烯管端或钢骨架聚乙烯复合管端的法兰盘连接应符合下列规定：
(2) Flange connections at polyethylene pipe ends or steel skeleton polyethylene composite pipe ends shall comply with the following provisions:
1、应将法兰盘套入待连接的聚乙烯法兰连接件的端部；
1. The flange shall be inserted at the end of the polyethylene flange connection to be connected.
2、应按本规程规定的热熔连接或电熔连接的要求，将法兰连接件平口端与聚乙烯复合管道进行连接。
2. Flange connectors shall be connected with polyethylene composite pipes according to the requirements of hot-melt connection or electric-melt connection stipulated in this regulation.
（三）、两法兰盘上螺孔应对中，法兰面相互平行，螺栓孔与螺栓直径应配套，螺栓规格应一致，螺母应在同一侧；紧固法兰盘上的螺栓应按对称顺序分次均匀紧固，不应强力组装；螺栓拧紧后宜伸出螺母1～3丝扣。
(3) The bolt holes on the two flanges should be parallel to each other, the bolt holes and bolt diameters should be matched, the bolt specifications should be the same, and the nuts should be on the sniaosu.07858.netshusongjiw.89ix.com wangdian.89ix.comgelishan.89ix.comchengbao.89ix.compentuji.89ix.comame side; the bolts on the fastening flanges should be tightened in symmetrical order, and should not be assembled forcefully; after the Bols are tightened, the nuts 1-3 should be extended.
（四）、法兰密封面、密封件不得有影响密封性能的划痕、凹坑等缺陷，材质应符合输送城镇燃气的要求。
(4) Flange sealing surfaces and seals shall not have any defects such as scratches or pits that affect the sealing performance, and the material shall meet the requirements for the transportation of urban gas.
（五）、法兰盘、紧固件应经过防腐处理，并符合设计压力要求。
(5) Flanges and fasteners shall undergo anticorrosion treatment and meet the design pressure requirements.