RF, FF, RTJ Flange Face and Finish
RF、FF、RTJ法蘭表面和光潔度

The flange face is the surface area that hosts the gasket. The 6 available types of flange face are flat (FF), raised (RF), ring joint (RTJ), lap joint, male and female (M&F), tongue and groove (T&G). Flanges with different faces require different gaskets and shall never be mated to prevent leakage of the joint. RF and FF flanges may have different types of “finish” (i.e. roughness on top the surface): smooth, stock and serrated.

法蘭面是承載墊圈的表面區域。6 種可用的法蘭面類型是 平面 (FF)、凸起 (RF)、環形接頭 (RTJ)、搭接接頭、公母 (M&F)、榫槽 (T&G)。不同面的法蘭需要不同的墊圈，并且不得配合以防止接頭泄漏。RF 和 FF 法蘭可能具有不同類型的“光潔度”（即表面頂部的粗糙度）：光滑、粗制和鋸齒狀。

FLANGE FACE TYPES
法蘭面類型

The ASME B16.5 and ASME B16.47 norms mention a few different types of flange faces:
ASME B16。5和ASME B16。47規范提到了幾種不同類型的法蘭面：

1. ·Flat face flange (FF)平面法蘭（FF）

2. ·Raised face flange (RF)凸面法蘭（RF）

3. ·Ring joint flange (RTJ)環形節片法蘭（RTJ）

4. ·Lap joint flange搭接節片法蘭

5. ·Male and female flange (M&F)外螺紋和內螺紋法蘭（M和法[拉]）

6. ·Large and small tongue-and-groove flange (T&G)大小榫槽法蘭（T和G）

A raised face flange (RF) is easy to recognize as the gasket surface area is positioned above the bolting line of the flange.
凸面法蘭（RF）很容易識別，因為墊圈表面區域位于法蘭的螺栓連接線上方。

The main scope of a raised face flange design is to concentrate the pressure of the two mating flanges on a small surface and increase the strength of the seal.
凸面法蘭設計的主要范圍是將兩個對接法蘭的壓強集中在一個小表面上，并增加密封的強度。

The most common flange finish for ASME B16.5 RF flanges is 125 to 250 micron Ra (3 to 6 micron Ra). The raised face is, according to ASME B16.5, the default flange face finish for manufacturers (this means that buyer shall specify in the order if another flange face is required, as flat face or ring joint).
ASME B16最常見的法蘭表面處理。5 RF法蘭為125至250微米Ra（3,4-二羥苯丙氨酸至6微米Ra）。根據ASME B16，凸面為。5.制造商的默認法蘭面光潔度（這意味著，如果需要另一個法蘭面，如平面或環形節片，買方應在訂單中指定）。

Raised face flanges are the most sold type of flange, at least for petrochemical applications.
凸面法蘭是最暢銷的法蘭類型，至少在石化應用中是這樣。

Flat face flanges (FF) have a contact surface having the same height as the bolting line of the flange. Full face gaskets, generally of the soft type, are used between two flat face flanges.
平面法蘭（FF）的接觸面高度與法蘭的螺栓連接線相同。在兩個平面法蘭之間使用通常為軟型的全表面墊片。

According to ASME B31.3, a flat face flange should never be mated with a raised face flange as the resulting flanged joint would definitely leak.
根據ASME B31。3,4-二羥苯丙氨酸，平面法蘭不應與凸面法蘭匹配，因為由此產生的法蘭節片肯定會泄漏。

A ring joint flanges (RTJ) is used when a metal-to-metal seal between the mating flanges is required (which is a condition for high-pressure and high-temperature applications, i.e. above 700/800 C°).
當需要在對接法蘭之間進行金屬對金屬密封時（這是高壓和高溫應用的條件，即高于700/800庫[侖]），使用環形節片法蘭（RTJ）。

A ring joint flange features a circular groove to accommodate a ring joint gasket (oval, or rectangular).
環形節片法蘭具有圓形坡口，以容納環形節片墊片（橢圓形或矩形）。

As the two ring joint flanges are bolted together and then tightened, the applied bolting force deforms the gaskets inside the flange groove creating a very tight metal-to-metal seal. To make this happen, the material of the ring joint gasket has to be softer (more ductile) than the material of the flange.
當兩個環形節片法蘭用螺栓連接在一起然后擰緊時，施加的螺栓力使法蘭坡口內的墊圈變形，形成非常緊密的金屬對金屬密封。為了實現這一點，環形節片墊片的材料必須比法蘭的材料更軟（更具延展性）。

RTJ flanges can be sealed by RTJ gaskets of different styles (R, RX, BX) and profiles (example: octagonal/oval for the R style).
RTJ法蘭料袋用不同樣式（R、RX、BX）和型材（例如：R樣式的八角形/橢圓形）的RTJ墊片密封。

The most common RTJ gasket is the R style with an octagonal section, as it ensures a very strong seal (the oval section is an older type). A “flat groove” design, however, accepts both RTJ gaskets having an octagonal or oval section.
最常見的RTJ墊片是帶有八角分段的R型，因為它確保了非常牢固的密封（橢圓形分段是一種較舊的類型）。然而，“平坡口”設計可以接受兩個具有八角形或橢圓形分段的RTJ墊片。

Two tongue and groove flanges (T&G face) perfectly fit one into the other: one flange has a raised ring, the other a groove and they can be mated easily (the tongue enters the groove and seals the joint).
兩個榫和坡口法蘭（睪酮和G面）完美地將一個安裝在另一個中：一個法蘭有一個凸起的環，另一個是坡口，它們料袋輕松匹配（榫進入坡口并密封節片）。

Tongue and groove flanges are standardized in both large and small types.
舌型和坡口法蘭在大型和小型兩種類型中都是標準化的。

MALE AND FEMALE FLANGE (M AND F)
內外法蘭（M和法[拉]）