低圧ラインにおける平坦溶接フランジのコストと信頼性

In industrial piping applications, the choice of flange type significantly influences both cost and operational reliability. When dealing with low-pressure pipeline systems, engineers and project managers often look for solutions that are safe, 効率的, and economical. One such solution is the flat welding flange, also known as the スリップオンフランジ. This type of flange provides an excellent balance of affordability and performance in non-critical piping environments.

この記事では, を探索してみます design features, 利点, application areas, インストール方法, そして 材料オプション of flat welding flanges. Whether you are engaged in infrastructure projects, 化学処理, HVAC システム, or water treatment, this guide will help you understand why flat welding flanges are a practical choice—and how ササフランジ delivers quality you can trust.

What Is a Flat Welding Flange?

あ flat welding flange is a ring-shaped component with a flat surface that is designed to slide over a pipe and be fillet welded in place. Unlike weld neck flanges that have a long tapered hub, flat welding flanges are compact, easy to align, and simple to install. They are generally used in systems that operate under low to moderate pressure.

主な特徴は次のとおりです。:

Flat sealing face
Short radial profile
Internal and external welds
Suitable for low-pressure and low-temperature applications

ササフランジ manufactures flat welding flanges according to international standards such as ASME B16.5, EN 1092-1, JIS B2220, そして DIN 標準, offering full customization on size, 材料, and facing type.

Why Flat Welding Flanges Are Ideal for Low-Pressure Systems

1. コスト効率の高い設計

One of the primary reasons flat welding flanges are used in low-pressure pipelines is their 費用対効果. The simplified structure means:

Less raw material consumption
Easier machining
Shorter welding time
Lower labor costs

When compared to other flange types such as weld neck or socket weld flanges, flat welding flanges provide reliable sealing performance at a significantly lower price point.

2. Simple Installation

Flat welding flanges are known for their 簡単な位置合わせ そして クイックインストール, especially in fieldwork or retrofit projects. Since the pipe simply slides into the flange bore, installers can position it precisely before welding. This minimizes the chances of misalignment and speeds up the process.

3. Compact and Lightweight

Because of the absence of a long neck, flat welding flanges are more compact and lighter than their weld neck counterparts. これにより、次のような用途に適しています。:

Space-limited installations
Skid-mounted equipment
Lightweight support structures

4. 多用途性

Flat welding flanges are compatible with a wide range of pipe materials and schedules. They can be used with:

炭素鋼管
Stainless steel pipelines
Plastic or lined pipe systems (with adapters)

Their adaptability makes them suitable for many low-pressure system configurations.

Typical Applications of Flat Welding Flanges

Flat welding flanges are used in non-critical piping systems where pressures and temperatures remain moderate and fluid leakage is not life-threatening. Common industries include:

● Water Supply and Drainage

Used in municipal water lines, irrigation networks, and stormwater systems where high pressure is not a concern.

● HVAC Systems

Employed in ductwork, chillers, and cooling towers to facilitate maintenance and modular installation.

● Food and Beverage Industry

In stainless steel form, flat welding flanges connect pipelines for transporting liquids such as milk, ジュース, or beer under sanitary conditions.

● Chemical and Pharmaceutical

Used in pipelines for low-pressure transfer of solvents, cleaning fluids, and process water.

● Fire Protection Systems

Applied in sprinkler and safety water lines, especially where future disassembly may be needed.

ササフランジ provides industry-specific flange solutions with suitable surface finishes and gasket compatibility.

How to Install a Flat Welding Flange

ステップ 1: パイプの準備

Cut the pipe to the correct length.
Clean the pipe end and the inside surface of the flange.
Remove rust, 油, or debris to ensure good weld quality.

ステップ 2: Flange Placement

Slide the flange over the pipe end.
Align bolt holes with the mating flange.
Maintain perpendicularity with respect to the pipe axis.

ステップ 3: 溶接

Apply a fillet weld on the inner side フランジの.
Follow with an outer fillet weld around the pipe and flange edge.
Use appropriate filler material and follow welding standards (ASME Section IX, ISO 15614).

ステップ 4: Gasket and Bolting

Place the gasket between flange faces (ゴム, PTFE, spiral wound depending on media).
Insert bolts and tighten them using a cross-pattern sequence.
Torque bolts gradually to ensure even load distribution.

ササフランジ offers flanges with precision-machined faces and bolt holes for easy, secure installation.

Material Options for Flat Welding Flanges

Depending on the fluid medium, 圧力定格, および環境暴露, flat welding flanges can be manufactured from:

炭素鋼 (ASTM A105, EN P245GH): Widely used for general industrial and construction purposes.
ステンレス鋼 (304/304l, 316/316l): Ideal for corrosive environments like food processing and marine systems.
合金鋼 (F11, F22): For systems with moderate temperature and higher strength requirements.
二相ステンレス鋼: Provides higher corrosion resistance and mechanical strength.
Galvanized or Epoxy Coated Steel: For extended corrosion resistance in water systems.

ササフランジ ensures full 材料のトレーサビリティ, offering flanges with EN 10204 3.1 または 3.2 証明書, along with NDTレポート そして pressure testing results.

Pressure Ratings and Standards

Flat welding flanges are generally suitable for low to moderate pressure systems, defined as:

ASME クラス: 150#, 300#
EN 圧力定格: PN6, PN10, PN16
JIS規格: 5K, 10K, 16K

They are not typically used in high-pressure or high-temperature services due to limitations in structural strength and weld support.

Surface Finishes and Coatings

To improve sealing performance and extend service life, surface finishing is critical:

Machined raised face (RF): For spiral wound or soft gaskets
平面 (FF): For rubber or full-face gaskets
コーティング: Galvanized, painted, epoxy powder-coated for corrosion protection

ササフランジ provides custom finishes upon request, ensuring compatibility with the operating environment.

Inspection and Quality Control

High-quality flat welding flanges undergo multiple quality assurance steps:

寸法検査
目視検査
Surface roughness check
Material identification (PMI)
Hydrostatic or pneumatic leak testing

で ササフランジ, all products are inspected and verified before dispatch. Clients may also request third-party inspections (SGS, TUV, BV) as part of project documentation.

ササフランジを選ぶ理由?

ササフランジ is a leading manufacturer of industrial flanges with a reputation for precision, 信頼性, そして顧客満足度. 私たちの利点は次のとおりです。:

Full range of flat welding flanges in ASME, EN, DIN, JIS規格
Wide material selection and stock availability
CNC加工, カスタム穴あけ, and coating services
短納期 with export packaging and documentation
Technical support and compliance with international standards

With over a decade of experience, ササフランジ is trusted by clients in over 60 国.

結論

For low-pressure piping systems, の flat welding flange is a practical and economical choice. It provides easy installation, dependable sealing, and flexibility across a range of industries. By understanding the design, 応用, and quality control processes involved, engineers and procurement teams can make informed decisions that balance cost and performance.