通风管道穿墙套管设计压力大于1.6MPa、用于气体介质的套管，设计压力大于2.5MPa、用于液体介质的套管，及用于易燃易爆或中等危害以上有毒介质的套管，通风管道穿墙套管应对焊缝外表面可进行探伤操作的内表面进行的着色探伤或者的射线探伤。通风管道穿墙套管对设计压力大于0.1MPa小于等于1.6MPa、用于气体介质的套管，及设计压力大于0.1MPa、小于等于2.5MPa、用于液体介质的通风管道穿墙套管。
The design pressure of the ventilation pipe wall bushing is greater than 1.6MPa for the casing with gas medium, 2.5MPa for the casing with liquid medium, and the casing with flammable, explosive or toxic medium above medium hazard. The ventilation pipe wall bushing shall perform dye penetrant inspection or radiographic inspection on the inner surface of the outer surface of the weld that can be used for flaw detection. The wall bushing of ventilation pipe shall be used for the casing of gas medium with design pressure greater than 0.1MPa but less than or equal to 1.6MPa, and the wall bushing of ventilation pipe with design pressure greater than 0.1MPa but less than or equal to 2.5MPa and used for liquid medium.
对每批同材料同厚度的纵焊缝应进行少10%的抽样着色探伤或射线探伤，同时，抽样应不少于一条焊缝。着色伤只适于管坯厚度不大于2mm的单道焊缝。验收标准为：不允许有裂纹等线状显示、四个或四个以上边距小于1.5mm的成行密集圆形显示、任一150mm焊缝长度内五个或五个以上直径大于1/2管坯厚度的随机分散的圆形显示。用于通风管道穿墙套管通常有两种，一种是机械加工成形的，另一种是通风管道穿墙套管。
For each batch of longitudinal welds with the same material and thickness, at least 10% of the samples shall be subject to dye penetrant inspection or radiographic inspection, and at least one weld shall be sampled. The stain damage is only applicable to the single weld with the thickness of tube blank not more than 2mm. The acceptance criteria are: no linear indications such as cracks, four or more rows of dense circular indications with edge distance less than 1.5mm, five or more random scattered circular indications with diameter greater than 1/2 of the tube blank thickness within any 150mm weld length. There are usually two types of wall bushing used for ventilation duct, one is machined and the other is wall bushing for ventilation duct.
通风管道穿墙套管总体高度比较低，但由于其制造方法和内在结构上的缺陷，使用寿命可能是有限的；机械加工成形的通风管道穿墙套管相比总体高度较高，但可靠性更高， 寿命更长。管网系统连接用的大型波纹套管，要求承压4MPa，耐温400℃，且有一定的耐腐蚀稳定性。通风管道穿墙套管的温度适应能力取决于所采用弹性材料的耐温性能。
The overall height of the wall bushing of the ventilation pipe is relatively low, but its service life may be limited due to its manufacturing method and inherent structural defects; Compared with the overall height, the machined wall bushing of the ventilation pipe has higher reliability and longer service life. The large corrugated casing used for the connection of pipe network system is required to have a pressure of 4MPa, a temperature resistance of 400 ℃, and a certain corrosion resistance stability. The temperature adaptability of the wall bushing of the ventilation pipe depends on the temperature resistance of the elastic material used.
因此根据通风管道穿墙套管的使用温度范围，选用合适温度性能参数的弹性材料，才能加工制造出合格的通风管道穿墙套管类组件。由于工作状态的不同，元件损坏或失效的模式也不同。仪表弹性元件工作在弹性范围内，基本上处于静态工作状态，使用寿命很长，一般达到数万次到数十万次。
Therefore, according to the use temperature range of the wall bushing of the ventilation pipe, select the elastic materials with appropriate temperature performance parameters to process and manufacture qualified components of the wall bushing of the ventilation pipe. Due to different working conditions, the mode of component damage or failure is different. The elastic element of the instrument works within the elastic range, and is basically in a static state. It has a long service life, usually tens of thousands to hundreds of thousands of times.
上一篇：风管的加固防火要注意什么？
下一篇：厨房排烟工程中对排烟管道包封要注意什么？
