B16.5 및 B16.47 플랜지용 플랜지 페이싱

배관 시스템에서, 그만큼 플랜지 직면 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 그리고 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
Pressure ratings: 수업 150 수업에 2500
Common in small- to medium-diameter piping systems

ASME B16.47

Covers large-diameter steel flanges ~에서 NPS 26 NPS에 60
Two series: 시리즈 A (heavier, for high-pressure applications) 그리고 Series B (lighter, 비용 효율적, derived from MSS SP-44)
Pressure ratings: 수업 75 수업에 900

Together, these two standards cover nearly the entire range of industrial flanges used in oil and gas, 화학 처리, 발전, 수처리, 해양공학.

What is Flange Facing?

그만큼 플랜지 직면 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, 온도, 그리고 액체형.

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

1. 제기된 얼굴 (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 에게 2500

응용: Oil refineries, 화학공장, water treatment systems

2. 편평한 얼굴 (FF)

Entire face of the flange is flat
Usually used with cast iron and fiberglass piping
Designed for low-pressure, 중요하지 않은 애플리케이션

응용: Water distribution, 펌프 연결, low-pressure pipelines

3. 링형 조인트 (RTJ)

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

응용: Offshore drilling, 석유화학, high-pressure gas systems

4. 혀와 그루브 (티&G)

One flange has a raised tongue, and the other has a matching groove
Prevents gasket displacement during installation
Provides excellent alignment

응용: 열교환기, 화학 반응기, custom piping assemblies

5. Male and Female (중&에프)

Similar to T&G but with flat mating surfaces
Male flange has a raised portion; female flange has a matching recess
Ensures accurate gasket positioning

응용: Specialty piping, 항공우주, and chemical systems

Surface Finish Requirements

ASME standards specify the surface roughness of flange facings to ensure proper gasket interaction:

Stock Finish: 가장 일반적인, concentric or spiral serrated finish (Ra 125–500 µin)
Smooth Finish: For soft gaskets, provides improved contact area (Ra 63–125 µin)
Cold Water Finish: Extremely smooth finish for special soft gaskets (라 ≤ 63 µin)

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

Key Considerations for Selecting Flange Facing

1. 작동 압력 및 온도

을 위한 고압, 고온 applications → RTJ is recommended
을 위한 low-pressure, ambient conditions → FF or RF may be sufficient

2. Gasket Type

Soft gaskets (고무, PTFE): Require smooth finishes
금속 개스킷 (spiral wound, 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, 티&G, and M&F are more expensive but necessary for critical service

Applications of B16.5 and B16.47 Flange Facing

석유 및 가스 산업

RTJ flanges for offshore rigs, subsea pipelines, 및 정유소
RF flanges for midstream and downstream processing

Chemical and Petrochemical

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

발전

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

Water Treatment and Distribution

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

해양 및 조선

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 누출 방지. Poorly selected or incorrectly finished facings lead to gasket failure, 중단 시간, and costly repairs. Engineers must evaluate the 개스킷 재료, bolt torque, and pressure-temperature rating when specifying flange facings.

결론

Flange facing is a critical element of ASME B16.5 and B16.47 flanges, ensuring reliable sealing and safe operation in diverse industries. 제기된 얼굴 is the most commonly used, 편평한 얼굴 is preferred for low-pressure systems, 그리고 링형 조인트 is indispensable for high-pressure, 고온 애플리케이션. Other facings such as 혀 & 홈 그리고 Male & Female are used in specialized systems requiring precision alignment.

For industries seeking reliable, high-quality flange solutions, SASAFLANGE 제안 ASME B16.5 and B16.47 flanges with precise facings tailored to specific applications. With strict adherence to global standards and advanced manufacturing technology, SASAFLANGE ensures long-term safety, 성능, 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.