밸브용 가스 분배 플랜지, 미터 및 레귤레이터

가스 유통 네트워크는 송전 시스템에서 최종 사용자에게 천연가스를 전달하는 데 중요한 역할을 합니다., 가구를 포함하여, 산업 시설, 그리고 발전소. These networks are made up of pipelines, 밸브, meters, and connection points—many of which are sealed and secured using 플랜지. Choosing the right flange is essential for ensuring leak-free operation, system safety, 그리고 long-term reliability.

이 기사에서는 key flange selection criteria for gas distribution networks, including pressure ratings, 재료 호환성, 밀봉 표면, 국제 표준 준수. Whether you’re designing new infrastructure or upgrading existing lines, these guidelines will help you make informed decisions.

SASAFLANGE

The Role of Flanges in Gas Distribution Systems

Flanges serve as critical connection points that allow for:

Easy assembly and disassembly of pipeline components
Secure sealing under variable pressure and temperature conditions
Integration of valves, 악기, 및 피팅
Maintenance access and pipeline modification

In gas distribution, where safety and system integrity are paramount, using high-quality flanges is non-negotiable. A failure at a flange joint can lead to gas leaks, pressure drops, fire hazards, and costly shutdowns.

주요 플랜지 선택 기준

To choose the right flange for a gas distribution network, several important factors must be considered:

1. 압력 등급

플랜지는 다음을 견딜 수 있어야 합니다. operating pressure of the gas system. 일반적인 압력 등급은 다음과 같습니다.:

ASME 클래스 150, 300, 600 for ANSI systems
PN10, PN16, PN25, PN40 for EN/DIN systems

The pressure class determines the 플랜지 두께, 볼트 서클, 그리고 개스킷 유형. 가스 파이프라인용, especially those supplying industrial zones or high-rise buildings, higher pressure classes (수업 300 or PN25+) 필요할 수 있습니다.

2. 재료 호환성

Material selection must take into account:

Type of gas (천연가스, methane, biogas, hydrogen blends)
Environmental exposure (지하철, 선박, urban pollution)
Operating temperature range

Common flange materials for gas distribution include:

재료	Application Notes
탄소강	Widely used for buried and above-ground gas lines
스테인레스 스틸	Ideal for corrosive environments and condensate-prone systems
연성이 있는 철	Common in water-gas crossover systems
합금강	Used in high-pressure or sour gas conditions

SASAFLANGE offers a wide range of materials, 포함 ASTM A105, A350 LF2, A182 F304/F316, and duplex stainless steels.

3. Sealing Surface Type

Sealing reliability is essential to prevent gas leakage. Flange face types affect gasket selection and sealing performance:

제기된 얼굴 (RF) – The most common; suits spiral wound or compressed fiber gaskets
편평한 얼굴 (FF) – Used with full-face gaskets, especially with cast iron components
링형 조인트 (RTJ) – Preferred in high-pressure systems for metal-to-metal sealing
혀 & 홈 (티&G) – Provides better gasket alignment and sealing

Correct sealing face choice ensures compatibility with the selected gasket material and installation practices.

4. 개스킷 호환성

Gasket selection must account for:

작동 압력 및 온도
Chemical compatibility with the gas and environment
System vibration and thermal expansion

Typical gasket materials in gas networks:

Spiral wound (graphite or PTFE filled) – High-performance applications
압축 섬유 개스킷 – General service and moderate pressures
Metal ring gaskets (RTJ) – High-pressure and sour gas environments
Elastomeric gaskets (EPDM, NBR) – Used in ductile iron flanges for low-pressure applications

SASAFLANGE provides flange face finishes optimized for each gasket type, ensuring reliable gas-tight sealing.

5. 부식 저항

Gas pipelines are often buried or exposed to harsh environments. 그러므로, flange corrosion resistance is vital:

사용 용융 아연 도금 또는 epoxy-coated carbon steel for buried services
For coastal or chemical areas, 선택하다 스테인레스 스틸 플랜지
In sour gas applications (H2S), select NACE-compliant materials

Corrosion can lead to flange deformation, bolt failure, and eventual leakage.

6. Bolt Pattern and Fastening

Correct bolt selection and torqueing are critical for flange integrity:

Follow ASME B16.5 또는 EN 1092-1 guidelines for bolt sizing
사용 corrosion-resistant bolts (예를 들어, zinc-plated or stainless steel)
Apply uniform torque using calibrated tools to prevent leaks

Fasteners must match flange material to prevent galvanic corrosion and ensure long-term performance.

7. Flange Type Selection

Choose the flange type based on installation, 압력, 및 유지 관리 요구 사항:

플랜지 유형	Characteristics
용접 목	High strength and shock resistance; for high pressure
슬립온	쉬운 설치; used in low to medium pressure
눈이 먼	Used to seal pipe ends and test segments
소켓 용접	For small diameter pipes in low-pressure systems
스레드	용접 불필요; suitable for flammable areas
랩조인트	Cost-saving for corrosion-resistant stub ends

SASAFLANGE manufactures all major flange types, available with customization for bore size, 얼굴형, and coating.

8. 표준 및 인증

Flanges used in gas distribution networks must comply with recognized standards:

ASME B16.5 / B16.47 – Dimensions, 압력 등급, 공차
EN 1092-1 / DIN 2501 – European flange standards
ASTM A105 / A182 / A350 – Material grades
ISO 7005 – International flange standard
NACE MR0175 / ISO 15156 – For sour gas service
EN 10204 3.1 / 3.2 – Material certification levels

SASAFLANGE delivers flanges with full traceability, 테스트 인증서, and third-party inspection options as required.

9. 설치 및 유지 관리 고려 사항

Proper flange installation is key to safe operation:

Clean gasket seating areas before assembly
Use calibrated torque wrenches for uniform tightening
Check flange alignment to prevent gasket damage
Apply anti-seize compounds to bolts in high-temperature systems

Routine inspection of flanges during maintenance cycles can detect early signs of leakage, 부식, or stress damage.

Use Case: Urban Gas Distribution Network

Scenario: A municipal utility upgrading its gas distribution system for high-density residential zones

요구사항:

Leak-proof joints
Corrosion resistance in humid climate
Easy access for valve maintenance

Solution by sasaflange:

PN16 EN 1092-1 slip-on flanges in A105 galvanized carbon steel
Spiral wound gaskets with graphite filler
MTC 3.1 and ultrasonic testing report included
Protective coating applied for underground service

결과:
Improved safety, reduced maintenance, and faster installation across 25 km of gas pipelines.

결론

Flanges are a critical component in the safe and efficient operation of gas distribution networks. Selecting the right flange involves more than just pressure class—it requires a deep understanding of 재료 호환성, sealing methods, 부식 방지, 그리고 system dynamics.

By adhering to these selection criteria and partnering with a trusted supplier like SASAFLANGE, gas utilities and contractors can ensure leak-free, 믿을 수 있는, and long-lasting pipeline connections.