플랜지 표면 마감 유형 안내

배관 시스템에서, flanges are critical components that ensure leak-free connections between pipes, 밸브, 슬리퍼, 그리고 다른 장비. While many buyers focus on flange material, 압력 등급, and dimensions, one detail that is often overlooked is the flange face finish type. The surface finish of a flange plays a decisive role in sealing performance, 개스킷 호환성, and long-term reliability of the joint.

This guide provides a comprehensive overview of flange face finish types, 그들의 응용, and how to select the right one for your project. It is designed to help procurement managers, 엔지니어, and industry professionals better understand this important but sometimes under-discussed feature of flanges.

What Is a Flange Face Finish?

A flange face finish refers to the texture or machining pattern applied to the flange’s sealing surface during manufacturing. This texture determines how the gasket will seat on the flange and how effectively it will prevent leakage.

The correct flange face finish ensures:

Proper gasket compression.
Adequate friction to prevent gasket blowout.
Reliable sealing under pressure and temperature variations.

Different standards, ~와 같은 ASME B16.5 그리고 EN 1092-1, specify acceptable flange face finishes depending on flange class and application.

Common Types of Flange Face Finishes

1. Stock Finish

The stock finish is the most common type used in standard industrial flanges. It is produced using a continuous spiral groove across the face. The roughness helps grip soft gaskets, such as compressed fiber or PTFE, ensuring effective sealing.

응용:

석유 및 가스 파이프라인.
Water distribution systems.
General industrial applications.

2. Spiral Serrated Finish

This finish is created using a spiral groove pattern but with deeper and more distinct cuts compared to stock finishes. The serrations provide additional grip, making it ideal for tougher gasket materials.

응용:

High-temperature and high-pressure services.
Systems with metallic or semi-metallic gaskets.

3. Concentric Serrated Finish

Unlike spiral serrations, concentric serrations are machined as circular grooves around the flange face. This pattern ensures uniform gasket seating and is especially useful for softer gaskets.

응용:

Low-pressure systems.
Applications requiring uniform gasket compression.

4. Smooth Finish

A smooth finish is achieved through fine machining or lapping, producing a mirror-like surface. It is commonly used with metal-to-metal seals or with soft gaskets requiring minimal surface roughness.

응용:

Vacuum services.
Cryogenic applications.
Specialty systems requiring high sealing integrity.

5. Cold Water Finish (CWF)

This finish is created by using a wide tool at high feed rates, resulting in a relatively smooth surface. It provides less grip but is still sufficient for certain gasket types.

응용:

Systems with metal gaskets.
Applications where smooth sealing is essential.

6. Phonographic Finish

The phonographic finish resembles a fine spiral groove, similar to the surface of a vinyl record. It ensures that the gasket does not creep or extrude under high pressure.

응용:

고압 파이프라인.
Refineries and petrochemical plants.

Why Flange Face Finish Matters

The choice of flange face finish affects:

누출 방지: A proper finish reduces the risk of leaks under pressure.
Gasket life: The wrong surface finish can damage gaskets or shorten their service life.
System reliability: Correct finishes maintain sealing integrity in varying conditions.
규정 준수: Industry standards mandate specific finishes for different classes and applications.

Industry Standards for Flange Finishes

ASME B16.5: Defines acceptable surface roughness values, typically 125–500 AARH (Arithmetic Average Roughness Height).
EN 1092-1: Provides European specifications for finishes based on gasket type.
MSS SP-6: Offers guidance on flange finish dimensions and tolerances.

Understanding and complying with these standards ensures safe and reliable installations.

Selecting the Right Flange Face Finish

When choosing a flange face finish, 다음을 고려하십시오:

Gasket Material
- Soft gaskets (고무, PTFE, fiber): Work best with stock or concentric serrated finishes.
- Semi-metallic gaskets (spiral wound, Kammprofile): Require serrated finishes for grip.
- Metal gaskets: Perform better with smooth or cold water finishes.
작동 압력 및 온도
- Higher pressures typically demand rougher finishes for secure sealing.
- Low-pressure or vacuum applications may require smoother finishes.
Industry and Application
- 석유 및 가스: Spiral serrated or phonographic finishes.
- Water supply: Stock finishes.
- 화학 처리: Finish selection based on gasket type and chemical compatibility.

피해야 할 일반적인 실수

Using the wrong finish for the gasket: Leads to premature gasket failure.
Overlooking standards: Can result in non-compliance and project rejection.
Focusing only on material and dimensions: Neglecting finish compromises sealing performance.

Case Example: Refinery Shutdown Due to Wrong Finish

A refinery once faced costly downtime because flanges with smooth finishes were mistakenly installed with spiral wound gaskets. The lack of grip led to gasket blowout, forcing emergency repairs. This example highlights why the right flange face finish type is just as important as the material or pressure class.

The Future of Flange Finishes

With increasing demand for precision sealing, modern machining technologies are improving consistency in flange face finishes. Digital inspection tools and stricter quality controls are ensuring better compliance with international standards. 같은 회사 SASAFLANGE are integrating advanced CNC machining to guarantee precise finishes tailored to each project’s requirements.

결론

Flange face finishes may appear to be a small detail, but they are essential to the performance and reliability of piping systems. By understanding the differences between stock, spiral serrated, concentric serrated, 매끄러운, cold water, and phonographic finishes, engineers and procurement teams can make informed decisions.

When selecting a distributor, always ensure they can supply flanges with the correct face finish according to your gasket type, pressure requirements, and industry standards. Partnering with a reliable supplier such as SASAFLANGE provides assurance of compliance, quality, 그리고 장기적인 성과.