RF, FF, RTJ Flange Face and Finish
RF、FF、RTJ法兰表面和光洁度

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.

法兰面是承载垫圈的表面区域。6 种可用的法兰面类型是 平面 (FF)、凸起 (RF)、环形接头 (RTJ)、搭接接头、公母 (M&F)、榫槽 (T&G)。不同面的法兰需要不同的垫圈，并且不得配合以防止接头泄漏。RF 和 FF 法兰可能具有不同类型的“光洁度”（即表面顶部的粗糙度）：光滑、粗制和锯齿状。

FLANGE FACE TYPES
法兰面类型

The ASME B16.5 and ASME B16.47 norms mention a few different types of flange faces:
ASME B16。5和ASME B16。47规范提到了几种不同类型的法兰面：

1. ·Flat face flange (FF)平面法兰（FF）

2. ·Raised face flange (RF)凸面法兰（RF）

3. ·Ring joint flange (RTJ)环形节片法兰（RTJ）

4. ·Lap joint flange搭接节片法兰

5. ·Male and female flange (M&F)外螺纹和内螺纹法兰（M和法[拉]）

6. ·Large and small tongue-and-groove flange (T&G)大小榫槽法兰（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.
凸面法兰（RF）很容易识别，因为垫圈表面区域位于法兰的螺栓连接线上方。

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.
凸面法兰设计的主要范围是将两个对接法兰的压强集中在一个小表面上，并增加密封的强度。

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最常见的法兰表面处理。5 RF法兰为125至250微米Ra（3,4-二羟苯丙氨酸至6微米Ra）。根据ASME B16，凸面为。5.制造商的默认法兰面光洁度（这意味着，如果需要另一个法兰面，如平面或环形节片，买方应在订单中指定）。

Raised face flanges are the most sold type of flange, at least for petrochemical applications.
凸面法兰是最畅销的法兰类型，至少在石化应用中是这样。

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.
平面法兰（FF）的接触面高度与法兰的螺栓连接线相同。在两个平面法兰之间使用通常为软型的全表面垫片。

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.
根据ASME B31。3,4-二羟苯丙氨酸，平面法兰不应与凸面法兰匹配，因为由此产生的法兰节片肯定会泄漏。

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°).
当需要在对接法兰之间进行金属对金属密封时（这是高压和高温应用的条件，即高于700/800库[仑]），使用环形节片法兰（RTJ）。

A ring joint flange features a circular groove to accommodate a ring joint gasket (oval, or rectangular).
环形节片法兰具有圆形坡口，以容纳环形节片垫片（椭圆形或矩形）。

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.
当两个环形节片法兰用螺栓连接在一起然后拧紧时，施加的螺栓力使法兰坡口内的垫圈变形，形成非常紧密的金属对金属密封。为了实现这一点，环形节片垫片的材料必须比法兰的材料更软（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法兰料袋用不同样式（R、RX、BX）和型材（例如：R样式的八角形/椭圆形）的RTJ垫片密封。

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.
最常见的RTJ垫片是带有八角分段的R型，因为它确保了非常牢固的密封（椭圆形分段是一种较旧的类型）。然而，“平坡口”设计可以接受两个具有八角形或椭圆形分段的RTJ垫片。

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).
两个榫和坡口法兰（睾酮和G面）完美地将一个安装在另一个中：一个法兰有一个凸起的环，另一个是坡口，它们料袋轻松匹配（榫进入坡口并密封节片）。

Tongue and groove flanges are standardized in both large and small types.
舌型和坡口法兰在大型和小型两种类型中都是标准化的。

MALE AND FEMALE FLANGE (M AND F)
内外法兰（M和法[拉]）