ブラインドフランジボードについて何を知っていますか?

産業用配管システムにおいて, blind flange boards—commonly referred to as ブラインドフランジ—play a critical role in sealing pipe ends and ensuring the safety and integrity of fluid and gas transmission. These components are often overlooked but are indispensable in systems that require pressure testing, 分離, or future expansion capability.

This article explores everything you need to know about blind flange boards, including their structure, functions, 材料, industry standards, とアプリケーション. Whether you are a mechanical engineer, maintenance technician, or procurement manager, this guide will help you understand the value and proper use of blind flanges in modern infrastructure.

What Is a Blind Flange Board?

あ blind flange board is a solid, disk-shaped component that has no central bore (hole). It resembles a standard flange but is completely sealed off in the center. It is bolted to the end of a pipe or fitting to block fluid or gas flow.

主な特長:

Round metal disk with bolt holes
No internal opening or passage
Often manufactured with raised face, 平らな面, またはRTJ (リング型ジョイント)
Available in a wide range of sizes and pressure classes

A blind flange is commonly used where a piping system needs to terminate temporarily or permanently.

What Are Blind Flange Boards Used For?

Blind flanges serve several crucial functions in various industries:

1. Pipe End Sealing

They close off the end of a piping system, preventing the escape of media or pressure.

2. 圧力試験

Blind flanges allow pressure tests to be conducted on newly installed pipelines or vessels.

3. Future Expansion Planning

They seal off open ends where future piping or equipment will be connected later.

4. Maintenance and Isolation

Used to isolate a section of the pipeline during shutdowns or repairs without disturbing the rest of the system.

ササフランジ provides blind flange boards in multiple pressure ratings (150 に 2500 クラス, PN10 to PN160) to suit a variety of operational conditions.

Blind Flange vs Other Flange Types

It’s essential to distinguish blind flanges from other common flange types:

フランジタイプ	Central Hole	目的
ウェルドネック	はい	Permanent pipe connection
スリッポン	はい	Easy to slide over pipe ends
ソケットウェルド	はい	For small diameter high-pressure pipes
ネジ付き	はい	Connects to threaded pipes
ラップジョイント	はい	Works with stub ends
ブラインドフランジ	いいえ	Blocks the end of a pipe

Blind flanges are the only type designed specifically to seal off a piping system rather than allow flow through it.

Materials Used for Blind Flange Boards

The material selection depends on pressure, 温度, and the nature of the fluid in the system:

炭素鋼 (A105, A350 LF2) – For general service
ステンレス鋼 (304, 316, 321) – For corrosion resistance
合金鋼 (F11, F22, F91) – For high temperature and pressure
デュプレックス/スーパーデュプレックス – For offshore and chemical applications
ニッケル合金 (ハステロイ, インコネル, モネル) – For highly corrosive environments

ササフランジ offers custom manufacturing services to supply blind flange boards that meet both standard and special material requirements, ensuring suitability for your application.

Industry Standards for Blind Flange Boards

Blind flanges are manufactured according to international standards such as:

ASME B16.5 – Pipe flanges and flanged fittings (1/2” 24まで″)
ASME B16.47 Series A/B – For larger diameter flanges (26″ 60まで″)
EN 1092-1 – 欧州規格
DIN 2527 – German blind flange standard
JIS B2220 – Japanese standard

Each standard specifies dimensions, 圧力クラス, 対面タイプ, and tolerance limits.

Pressure Ratings and Thickness

Blind flanges are subject to full internal pressure since there is no flow-through. したがって, they are typically 厚い than regular flanges of the same size and pressure class.

圧力クラス (ASME):

クラス 150
クラス 300
クラス 600
クラス 900
クラス 1500
クラス 2500

Blind flanges must be selected based on 設計圧力と温度 to ensure safety and long-term performance.

Sealing Face Types

Blind flange boards come in several face types for compatibility with gaskets and pipe connections:

盛り上がった顔 (RF) – Standard for most process piping
平面 (FF) – Used where flanges are cast iron or non-metallic
リング型ジョイント (RTJ) – For high-pressure applications with metal-to-metal seals

Choosing the correct face type ensures proper gasket compression and leak-proof sealing.

Advantages of Using Blind Flange Boards

Complete system isolation
Easy to install or remove
メンテナンスの手間がかからない
Adaptable to different piping systems
Ideal for future system modification

With proper handling and installation, blind flanges offer a cost-effective and secure method to terminate or isolate pipelines.

設置ガイドライン

To install a blind flange board correctly:

Inspect sealing surfaces for damage or rust
Select appropriate gasket material for media and temperature
Use proper bolt torque sequence (星模様)
Tighten in stages to ensure even compression
Recheck bolt torque after system pressurization

Improper installation can lead to ガスケットの故障 または フランジの反り, resulting in leaks or blowouts.

ササフランジ recommends following ASME PCC-1 bolting standards for safe flange assembly practices.

Maintenance Tips

Inspect sealing face regularly for corrosion or dents
Replace gaskets during each reinstallation
Retorque bolts periodically in high-pressure or vibrating systems
Use protective covers when flanges are stored or idle

Routine maintenance prolongs flange life and enhances system reliability.

Why Choose sasaflange Blind Flange Boards?

で ササフランジ, we specialize in the manufacture and global supply of high-quality blind flange boards:

の遵守 ASME, DIN, JIS, EN 標準
幅広い材質選択, ステンレス鋼を含む, 合金, および炭素鋼
Custom machining for size, 厚さ, or special surface finishes
Corrosion-resistant coatings upon request
Fast delivery and export-ready packaging

Whether you’re building a pipeline, 圧力容器, or process system, ササフランジ ensures your blind flanges are precision-engineered for safety, 強さ, そしてパフォーマンス.

結論

Blind flange boards are more than just solid disks—they are crucial safety components in pressurized systems. They block flow, isolate systems, and enable testing and maintenance operations. With wide material options, high pressure ratings, and compatibility with global standards, blind flanges are indispensable in modern industrial systems.

When selecting or specifying blind flanges, 考慮する 材料の適合性, 圧力クラス, 顔のタイプ, and standard compliance. For high-performance blind flange boards backed by expert support, 信頼 ササフランジ—your reliable partner in industrial piping components.