B16.5 および B16.47 フランジ用のフランジ面

配管システム内, の フランジフェーシング is a critical feature that determines how two flanges seal together with the help of a gasket. Without proper facing, even the strongest flanges and the best bolts cannot prevent leaks. Two of the most widely recognized standards for flanges are ASME B16.5 そして ASME B16.47. While both cover different flange size ranges, their facing types share common design principles and applications.

This article provides a detailed guide on flange facing for B16.5 and B16.47 flanges, explaining the types of facings, their functions, and the key considerations engineers must evaluate when selecting the right flange connection for industrial projects.

Overview of B16.5 and B16.47 Flanges

ASME B16.5

Covers flanges and flanged fittings from NPS ½ to NPS 24
圧力定格: クラス 150 クラスへ 2500
Common in small- to medium-diameter piping systems

ASME B16.47

Covers 大径鋼製フランジ から NPS 26 NPSへ 60
Two series: シリーズA (heavier, for high-pressure applications) そして シリーズB (ライター, 費用対効果の高い, derived from MSS SP-44)
圧力定格: クラス 75 クラスへ 900

一緒に, these two standards cover nearly the entire range of industrial flanges used in oil and gas, 化学処理, 発電, 水処理, 海洋工学.

What is Flange Facing?

の フランジフェーシング is the finish applied to the surface of the flange that comes into contact with the gasket. Its purpose is to ensure tight sealing, proper load distribution, and gasket retention. Different facing types are specified depending on the application’s pressure, 温度, そして液体タイプ.

Common Flange Facing Types for B16.5 and B16.47

1. 盛り上がった顔 (RF)

Most widely used facing type
A small area around the bore is raised above the bolt circle
Standard roughness ensures gasket grip
Used in Classes 150 に 2500

アプリケーション: Oil refineries, 化学プラント, water treatment systems

2. 平面 (FF)

Entire face of the flange is flat
Usually used with cast iron and fiberglass piping
Designed for low-pressure, non-critical applications

アプリケーション: Water distribution, ポンプ接続, 低圧パイプライン

3. リング型ジョイント (RTJ)

A machined groove accommodates a metallic ring gasket
Provides metal-to-metal seal
Withstands very high pressure and temperature
Available in Classes 600 以上

アプリケーション: Offshore drilling, 石油化学, high-pressure gas systems

4. タング・アンド・グルーブ (T&G)

片方のフランジには盛り上がった舌が付いています, もう一方には一致する溝があります
Prevents gasket displacement during installation
Provides excellent alignment

アプリケーション: 熱交換器, 化学反応器, custom piping assemblies

5. 男性と女性 (M&F)

Tに似ている&G but with flat mating surfaces
Male flange has a raised portion; female flange has a matching recess
Ensures accurate gasket positioning

アプリケーション: Specialty piping, 航空宇宙, and chemical systems

Surface Finish Requirements

ASME standards specify the 表面粗さ of flange facings to ensure proper gasket interaction:

ストック仕上げ: 最も一般的な, concentric or spiral serrated finish (Ra 125–500 µin)
滑らかな仕上がり: For soft gaskets, provides improved contact area (Ra 63–125 µin)
冷水仕上げ: Extremely smooth finish for special soft gaskets (Ra ≤ 63 µin)

Key Point: The correct surface finish prevents leakage and extends gasket life.

Key Considerations for Selecting Flange Facing

1. 使用圧力と温度

のために 高圧, 高温 applications → RTJ is recommended
のために low-pressure, ambient conditions → FF or RF may be sufficient

2. ガスケットの種類

ソフトガスケット (ゴム, PTFE): Require smooth finishes
メタルガスケット (螺旋状の傷, RTJ): Require serrated or grooved facings

3. Piping Material Compatibility

Cast iron and non-metallic pipes → Use Flat Face
Steel and alloy pipelines → Use Raised Face or RTJ

4. Maintenance and Accessibility

RF and FF flanges are easier to assemble and maintain
RTJ flanges require precise machining and ring gasket handling

5. Cost and Availability

RF and FF are cost-effective and widely available
RTJ, T&G, and M&F are more expensive but necessary for critical service

Applications of B16.5 and B16.47 Flange Facing

石油およびガス産業

RTJ flanges for offshore rigs, 海底パイプライン, および製油所
RF flanges for midstream and downstream processing

化学および石油化学

RF and T&G flanges in reactors and distillation units
Corrosion-resistant alloys required for aggressive chemicals

発電

RTJ flanges for high-pressure steam lines
RF flanges for cooling water systems

水処理と配水

FF flanges for low-pressure water pipelines
RF flanges for desalination and wastewater plants

海洋および造船

Stainless steel RF flanges for seawater cooling
RTJ flanges for marine exhaust and fuel systems

Flange Facing and Leak Prevention

The correct flange facing directly influences 漏れ防止. Poorly selected or incorrectly finished facings lead to gasket failure, ダウンタイム, and costly repairs. Engineers must evaluate the gasket material, ボルトトルク, and pressure-temperature rating when specifying flange facings.

結論

Flange facing is a critical element of ASME B16.5 and B16.47 flanges, ensuring reliable sealing and safe operation in diverse industries. 盛り上がった顔 is the most commonly used, 平面 is preferred for low-pressure systems, そして リング型ジョイント is indispensable for high-pressure, 高温用途. Other facings such as 舌 & 溝 そして 男 & 女性 are used in specialized systems requiring precision alignment.

For industries seeking reliable, high-quality flange solutions, ササフランジ オファー ASME B16.5 and B16.47 flanges with precise facings tailored to specific applications. With strict adherence to global standards and advanced manufacturing technology, ササフランジ ensures long-term safety, パフォーマンス, and efficiency in piping systems worldwide.

By carefully considering flange facing types, engineers and buyers can optimize system integrity, reduce leakage risks, and extend the service life of critical piping components.