平焊法兰:取材方便,制造简单,成本低,使用广泛;但刚性较差,因此不得用于有供需、易燃、易爆和较高真空度要求的化工工艺配管系统和高度、极度危害的场合。密封面型式有平面和突面。
平焊法兰的优点是制造简单、成本低,但焊接工作量大,焊条消耗多,经不起高温、高压、反复弯曲和温度波动的作用,一般用于PN≤2。5MPa,常温,工作温度t≤0℃的管路。
平焊钢法兰适用于公称压力不超过2.5MPa的碳素钢管道连接。其密封面可以制成光滑式,凹凸式和榫槽式三种。光滑式平焊法兰的应用量最大。多用于介质条件比较缓和的情况下,如低压非净化压缩空气、低压循环水,它的优点是价格比较便宜。The flat welding flange's merit is the manufacture is simple, the cost is low, but the welding work load is big, the welding rod consumes many, cannot withstand high temperature, high-pressured, the alternating bending and the temperature fluctuation function, generally uses in PN≤2. 5MPa, normal temperature, operating temperature t≤0℃ pipeline. the even welding steel flange is suitable in the nominal pressure does not surpass 2.5MPa the carbon steel pipeline connection. Its packing surface may make smooth -like, concave-convex -like and key way type three kinds. The smooth -like flat welding flange should the amount used be biggest. Uses in the situation which the ambient condition comparison relaxes, like the low pressure non-purification compressed air, the low pressure circulating water, its merit is the price is quite cheap.
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