Flange Connection of Polyurethane Thermal Insulation Pipe

聚氨酯保温钢管目前罕见的衔接方式是焊接，但是在有一些聚氨酯保温钢管工程中也是需求与法兰停止衔接的。

At present, the most rare connection method of polyurethane insulating steel pipe is welding, but in some polyurethane insulating steel pipe projects, it is also needed to stop the connection with flange.

管道法兰按与管子的衔接方式可分爲五种根本类型：平焊法兰、对焊法兰、螺纹法兰(全体法兰)、承插焊法兰、松套法兰。

Pipeline flange can be divided into five basic types according to the connection mode between pipe and pipe: flat welded flange, butt welded flange, threaded flange (all flanges), socket welded flange and loose sleeve flange.

1.平焊钢法兰：适用于公称压力不超越2.5MPa的碳素钢管道衔接。平焊法兰的密封面可以制成润滑式、凹凸式和榫槽式三种。润滑式平焊法兰的使用量大，多用于介质条件比拟紧张的状况下，如高压非污染紧缩空气、高压循环水，它的优点是价钱比拟廉价。

1. Flat welded steel flange: suitable for joining of carbon steel pipes with nominal pressure not exceeding 2.5 MPa. The sealing surface of flat welded flange can be made into lubrication type, concave-convex type and mortise-groove type. Lubricated flat welded flange is the most widely used flange. It is mostly used in tight medium conditions, such as high-pressure non-polluting compressed air and high-pressure circulating water. Its advantages are low price.

2.对焊钢法兰：用于法兰与管子的对口焊接，其构造合理，强度与刚度较大，经得起低温高压及重复弯曲和温度动摇，密封性牢靠。

2. Butt welded steel flange: It is used for butt welding of flange and pipe. Its structure is reasonable, its strength and rigidity are large, it can withstand low temperature and high pressure, repeated bending and temperature shaking, and its sealing is reliable.

3.承插焊法兰：常用于PN≤10.0MPa，DN≤40的管道中。

3. Socket and socket flanges: commonly used in pipes with PN < 10.0MPa and DN < 40.

4.松套法兰：松套法兰俗称活套法兰，分焊环活套法兰、翻边活套法兰和对焊活套法兰。常用于介质温度和压力都不高而介质腐蚀性较强的状况。当介质腐蚀性较强时，法兰接触介质的局部(翻边短节)爲耐腐蚀的初等级资料如不锈钢等资料，而内部则应用高等级资料如碳钢资料的法兰环夹紧它以完成密封。

4. Loose sleeve flange: Loose sleeve flange is commonly known as looper flange, split welded ring looper flange, flanging looper flange and butt welded looper flange. It is often used in the condition that the temperature and pressure of medium are not high and the corrosiveness of medium is strong. When the medium is corrosive, the local part of the flange contact medium (flanged joint) is the primary grade data of corrosion resistance such as stainless steel, while the flange ring of high grade data such as carbon steel is used to clamp it to complete the sealing.

5.全体法兰：经常是将法兰与设备、管子、管件、阀门等做成一体，这种型式在设备和阀门上常用。

5. All flanges: Flanges are often integrated with equipment, pipes, fittings, valves, etc. This type is commonly used in equipment and valves.

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