《室内给水排水设计规范》和修改后的《建筑给水排水设计规范》,都要求室内排水管系中存水弯水封深度至少需要50mm,而1988年颁布的《排水用灰口铸铁直管及管件标准》(GB8716-88)规定的存水弯水封仅10mm。两者之差已引起不少混乱。本文根据国内外资料和自己的亲身经验对这个问题提出了自己的看法和建议。 The “Design Code for Indoor Water Supply and Drainage” and the revised “Code for Design of Building Water Supply and Drainage” all require that the depth of the water trap seal in the indoor drainage pipe system be at least 50mm, and the “Gray Cast Iron Straight Pipe and Drain Pipe” promulgated in 1988 The water seal water seal specified by the fitting standard (GB8716-88) is only 10mm. The difference between the two has caused a lot of confusion. This article puts forward its own opinions and suggestions on this issue based on domestic and foreign data and own personal experience.