中程度のサービス配管用のスリップオンフラット溶接フランジ

工業用配管の世界では, cost-effective and efficient solutions are essential—especially in systems where pressure and temperature conditions are moderate. Among various flange options, の flat welding flange (also known as a slip-on flange) stands out as a practical and economical choice for low-pressure pipeline systems.

This article explores the advantages, technical features, アプリケーション, インストール方法, and material options of flat welding flanges. Whether you’re a pipeline contractor, engineer, or procurement specialist, this guide will help you understand why flat welding flanges are a popular option in industries such as water treatment, 空調設備, 石油化学製品, and general construction.

What Is a Flat Welding Flange?

あ flat welding flange is a type of pipe flange that slides over the pipe and is then fillet welded on both the inside and outside to provide strength and leak-tightness. Unlike weld neck flanges, flat welding flanges do not have a hub and are ideal for applications where pressure is relatively low and where space and budget constraints matter.

Standard references include:

ASME B16.5 – For pipe flanges and flanged fittings
EN 1092-1 タイプ 01 または 02 – For European specifications
JIS B2220 – For Japanese standard flanges

ササフランジ manufactures flat welding flanges in a variety of sizes and materials to meet international standards and project specifications.

Design Features of Flat Welding Flanges

Bore size: Slightly larger than the pipe outer diameter to allow easy insertion
盛り上がった顔 (RF) or flat face (FF): Options depending on sealing needs
No long tapered hub: Compact and lightweight
Fillet welds: Applied on both sides to secure the pipe
ボルト穴: Equally spaced to match standard bolt patterns

The simple geometry and easy alignment make flat welding flanges suitable for quick assembly, 修理, and field modifications.

平坦溶接フランジのメリット

1. Cost-Effective Solution

Flat welding flanges are more affordable than weld neck flanges due to:

Less material used
Easier machining
Faster installation time
Lower welding complexity

This makes them ideal for budget-sensitive projects and large-scale piping networks.

2. Easy Installation and Alignment

These flanges are easier to align with pipes during welding. Their slip-on design accommodates minor misalignment and allows quick positioning.

Saves labor time
Reduces risk of installation errors
No need for complex beveling as with butt-weld connections

3. Lightweight and Space-Saving

The absence of a hub reduces the overall weight and space requirement, making them suitable for:

Compact equipment layouts
Lightweight supports
Skid-mounted systems

4. Versatility in Applications

Flat welding flanges can be used for:

Fluids (水, 空気, 油)
Low-pressure steam
Non-hazardous gases
Non-corrosive liquids

They are common in non-critical systems that don’t require high structural strength.

5. Wide Availability and Customization

Flat welding flanges are widely produced and available in:

圧力クラス: 150#, 300#, PN10, PN16
サイズ: DN15～DN2000
Facing types: RF, FF, and RTJ
材料: 炭素鋼, ステンレス鋼, 合金鋼

ササフランジ offers quick delivery of standard and customized flat welding flanges for global projects.

Typical Applications of Flat Welding Flanges

● Water Supply and Drainage

Used in municipal pipelines, ポンプ場, and wastewater treatment plants due to corrosion-resistant coatings and simple connections.

● HVAC システム

Flat welding flanges are ideal for air conditioning and heating pipelines, offering quick on-site adjustments and tight seals.

● 化学および石油化学プラント

Applied in non-critical service pipelines carrying mild chemicals, 溶剤, or low-pressure steam.

● 食品および飲料の加工

When made from stainless steel, flat welding flanges are used in hygienic piping for beverages, dairy, and brewing.

● Power Plants and Energy Facilities

Applied in auxiliary systems such as cooling water, low-pressure return lines, and drainage networks.

Installation Procedure

Installing a flat welding flange requires the following steps:

パイプの準備
- Cut the pipe to the required length
- Clean the pipe end to remove oil, ダート, or burrs
Flange Placement
- Slide the flange over the pipe end
- Align the bolt holes with mating flange or template
溶接
- Perform a fillet weld on the inner side of the pipe end
- Follow with an outer fillet weld around the flange face
Gasket Insertion and Bolt Tightening
- Place the gasket (螺旋状の傷, ゴム, 等)
- Insert bolts and tighten in a cross-pattern using a torque wrench
- Follow appropriate torque sequence to ensure uniform pressure
試験と検査
- Conduct hydrostatic or pneumatic testing to check for leaks
- Visually inspect welds for quality and completeness

ササフランジ supplies flanges with precision machining, making installation smooth and consistent.

材質のオプション

Flat welding flanges are manufactured in a variety of materials, 含む:

炭素鋼 (ASTM A105, EN P245GH): Affordable and strong for general use
ステンレス鋼 (304, 316, 321): Corrosion-resistant for chemical and food applications
合金鋼 (F11, F22): Used in moderate temperature and pressure environments
二相ステンレス鋼: Offers superior strength and corrosion resistance
ニッケル合金: For specialized systems requiring chemical resistance

Surface treatments may include:

Galvanizing
Epoxy coating
不動態化
Pickling and polishing

ササフランジ offers material traceability, EN10204 3.1 証明書, and special coatings upon request.

Pressure Ratings and Standards

Flat welding flanges are designed for low to moderate pressure applications:

ASME B16.5 クラス: 150#, 300#
EN 1092-1 圧力クラス: PN6, PN10, PN16
JIS B2220 クラス: 5K, 10K, 16K

Always select the correct pressure class and material based on system pressure, 温度, そして液体タイプ.

Inspection and Quality Control

To ensure safety and performance, all flat welding flanges must undergo:

寸法検査
材質検証 (PMI)
Flatness and facing finish check (Ra ≤ 3.2 μm)
Bolt hole alignment
Visual inspection of welds (if factory-welded)
Hydro or air leak testing if assembled

ササフランジ 維持する ISO 9001-certified quality systems and third-party inspection cooperation (SGS, BV, TUV).

ササフランジを選ぶ理由?

ササフランジ is a professional flange manufacturer serving global customers in energy, 石油化学, 水, およびインフラストラクチャプロジェクト. Key advantages include:

Full range of flat welding flanges in ASME, EN, DIN, JIS, and GOST standards
Manufacturing in stainless steel, 炭素鋼, および特殊合金
CNC加工, surface finishing, and drilling
3.1/3.2 certified quality control and fast export support
Custom sizes, コーティング, and gasket kits available

For budget-conscious projects or low-pressure pipelines, ササフランジ delivers reliable flanged solutions with fast turnaround.

結論

Flat welding flanges are a smart and economical solution for low-pressure pipeline systems across a wide range of industries. Their ease of installation, 費用対効果, and flexibility make them ideal for non-critical yet essential piping applications.

By sourcing high-quality flat welding flanges from ササフランジ, customers benefit from certified materials, international compliance, and expert support—ensuring the success of every pipeline project.