中國管道解決方案提供商:www.tourochina.com

如何根據法蘭的密封面進行分類?

法蘭根據密封面分為以下幾類

  • A. 全平面 (FF)
  • B. 突面 (R/F)
  • C. 榫面和槽面 (T/G)
  • D. 凸面和凹面 (M/F)
  • E. 環連接面 (RTJ)

Flange faces

Different types of flange faces are used as the contact surfaces to seat the sealing gasket material. ASME b16.5 and B16.47 define various types of flange facings, including the raised face, the large male and female facings which have identical dimensions to provide a relatively large contact area.

Other flange facings covered by these standards include the large and small tongue-and-groove facings, and the ring joint facing specifically for ring joint type metal gaskets.

突面 (RF)

突面應用在幾種類型當中最為廣泛,最為常用的一種,國際標準與歐洲體系和國內的標準均為固定高度,但美標法蘭中應注意高壓力的高度會增高密封面的高度,墊片的使用也有多種類型。適用於突面密封面法蘭的墊片有各種非金屬平墊片、包覆墊片;金屬包墊;纏繞式墊片(含帶外環或帶內外環)等。

The purpose of a RF flange is to concentrate more pressure on a smaller gasket area and thereby increase the pressure containment capability of the joint. Diameter and height are in ASME b16.5 defined, by pressure class and diameter. Pressure rating of the flange determines the height of the raised face.

The typical flange face finish for ASME b16.5 RF flanges is 125 to 250 µin Ra (3 to 6 µm Ra).

flg rf - 如何根據法蘭的密封面進行分類?

Raised Face height

For the height measures H and B of all described dimensions of flanges on www.tourochina.com, with exception of the Lap Joint flange, it is important to understand and remember the following:

In pressure classes 150 and 300, the height of raised face is approximately 1.6 mm (1/16 inch). In these two pressure classes, almost all suppliers of flanges, show in their catalog or brochure, the H and B dimensions including the raised face height. (Fig. 1)

flg rf height - 如何根據法蘭的密封面進行分類?

In pressure classes 400, 600, 900, 1500 and 2500, the height of raised face is approximately 6.4 mm (1/4 inch). In these pressure classes, most suppliers show the H and B dimensions excluding the raised face height. (Fig. 2)

全平面 (FF)

全平面的表面為全平,適用於壓力不高、介質無毒的場合。

Flat face flanges are never to be bolted to a raised face flange. ASME B31.1 says that when connecting flat face cast iron flanges to carbon steel flanges, the raised face on the carbon steel flange must be removed, and that a full face gasket is required. This is to keep the thin, bittle cast iron flange from being sprung into the gap caused by the raised face of the carbon steel flange.

flg ff - 如何根據法蘭的密封面進行分類?

環連接面 (RTJ)

環連接面密封的法蘭,也屬於窄面法蘭,並在法蘭的突面上開出一環狀梯形槽作為法蘭密封面,和榫槽面法蘭一樣,這種法蘭在安裝和拆卸時必須在軸向將法蘭分開,囙此,在管線設計時要考慮到將法蘭在軸向分開的可能。這種密封面專用來與金屬材料加工成形狀為八角形或橢圓形的實體金屬墊片配合,實現密封連接。由於金屬環墊可以依據各種金屬的固有特性,因而這種密封面的密封性能好,對安裝要求也不太嚴格,適合於高溫、高壓工况,但密封面的加工精度較高。

flg rtj - 如何根據法蘭的密封面進行分類?

Ring Type Joint gaskets

Ring Type Joint gaskets are metallic sealing rings, suitable for high-pressure and high-temperature applications. They are always applied to special, accompanying flanges which ensure good, reliable sealing with the correct choice of profiles and material.

Ring Type Joint gaskets are designed to seal by “initial line contact” or wedging action between the mating flange and the gasket. By applying pressure on the seal interface through bolt force, the “softer” metal of the gasket flows into the microfine structure of the harder flange material, and creating a very tight and efficient seal.

gasket rtj - 如何根據法蘭的密封面進行分類?

Most applied type is style R ring that is manufactured in accordance with ASME B16.20 used with ASME b16.5 flanges, class 150 to 2500. Style “R” ring type joints are manufactured in both oval and octagonal configurations.

The octagonal cross section has a higher sealing efficiency than the oval and would be the preferred gasket. However, only the oval cross section can be used in the old type round bottom groove. The newer flat bottom groove design will accept either the oval or the octagonal cross section.

The sealing surfaces on the ring joint grooves must be smoothly finished to 63 Microinches and be free of objectionable ridges, tool or chatter marks. They seal by an initial line contact or a wedging action as the compressive forces are applied. The hardness of the ring should always be less than the hardness of the flanges.

Style R ring type joints are designed to seal pressure up to 6,250 psi in accordance with ASME b16.5 pressure ratings and up to 5,000 psi.

榫面和槽面 (T&G)

榫面和槽面同凹凸面差不多,也是一公一母的配對密封面類型,同樣是配對使用。其墊片位於環狀凹槽內,受兩側金屬壁的限制·可免於墊片受壓變形而被擠入筦道中。由於墊片不與管內流體介質直接接觸,較少遭受流體介質的浸蝕或腐蝕,故可用於高壓、易燃易爆、有毒介質等對密封要求較嚴的場合。這種密封面墊片安裝對中性好,但密封面加工比較困難,更換墊片時易損傷密封面,而且安裝和拆卸時必須在軸向將法蘭分開,囙此在管線設計時要考慮到有將法蘭在軸向分開的可能。榫槽面密封面適用的墊片有:各種金屬及非金屬平墊、金屬包墊及基本型纏繞墊片等。

flg tg - 如何根據法蘭的密封面進行分類?

凸面和凹面 (M&F)

凸面和凹面,這兩種密封面類型是一對,一雌一雄,必須配套使用,按裝時便於對中,還能防止墊片被擠出。適用於壓力較高的場合。凹凸面密封面適用的密封墊片有:各種非金屬平墊、包覆墊;金屬包墊;基本型或帶內環型纏繞摯片等。

The female face is 3/16-inch deep, the male face is1/4-inch high, and both are smooth finished. The outer diameter of the female face acts to locate and retain the gasket. Custom male and female facings are commonly found on the Heat Exchanger shell to channel and cover flanges.

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