目的和范围1。1本标准确定了法兰钢的首选尺寸 鼓风机管道，便于不同制造商的设备互换 制造商。1.2包括螺栓连接和夹紧连接的管道法兰 在本标准中。管道、弯头、， 排水导流板和特殊管段，不包括内部管道 尺寸和连接法兰尺寸由用户自行决定 单个制造商的。

Purpose and scope1.1 This Standard establishes preferred dimensions for flanged steel blower pipe to facilitate interchange of equipment made by different manufacturers.1.2 Pipe flanges for both bolted and clamped connections are included in this Standard. Configuration and construction of pipe, elbows, discharge deflectors and specialty pipe sections, other than inside pipe dimensions and connecting flange dimensions, are left to the discretion of the individual manufacturer.