Flange Connection of Polyurethane Thermal Insulation Pipe

聚氨酯保溫鋼管目前罕見的銜接方式是焊接，但是在有一些聚氨酯保溫鋼管工程中也是需求與法蘭停止銜接的。

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.

管道法蘭按與管子的銜接方式可分爲五種根本類型：平焊法蘭、對焊法蘭、螺紋法蘭(全體法蘭)、承插焊法蘭、松套法蘭。

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.平焊鋼法蘭：適用于公稱壓力不超越2.5MPa的碳素鋼管道銜接。平焊法蘭的密封面可以制成潤滑式、凹凸式和榫槽式三種。潤滑式平焊法蘭的使用量大，多用于介質(zhì)條件比擬緊張的狀況下，如高壓非污染緊縮空氣、高壓循環(huán)水，它的優(yōu)點是價錢比擬廉價。

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.對焊鋼法蘭：用于法蘭與管子的對口焊接，其構(gòu)造合理，強度與剛度較大，經(jīng)得起低溫高壓及重復(fù)彎曲和溫度動搖，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.承插焊法蘭：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.松套法蘭：松套法蘭俗稱活套法蘭，分焊環(huán)活套法蘭、翻邊活套法蘭和對焊活套法蘭。常用于介質(zhì)溫度和壓力都不高而介質(zhì)腐蝕性較強的狀況。當介質(zhì)腐蝕性較強時，法蘭接觸介質(zhì)的局部(翻邊短節(jié))爲耐腐蝕的初等級資料如不銹鋼等資料，而內(nèi)部則應(yīng)用高等級資料如碳鋼資料的法蘭環(huán)夾緊它以完成密封。

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.全體法蘭：經(jīng)常是將法蘭與設(shè)備、管子、管件、閥門等做成一體，這種型式在設(shè)備和閥門上常用。

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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