Bạn biết gì về bảng mặt bích mù?

Trong hệ thống đường ống công nghiệp, blind flange boards—commonly referred to as mặt bích mù—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, sự cách ly, or future expansion capability.

This article explores everything you need to know about blind flange boards, including their structure, functions, nguyên vật liệu, tiêu chuẩn ngành, và ứng dụng. 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?

MỘT 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.

Các tính năng chính:

Round metal disk with bolt holes
No internal opening or passage
Often manufactured with raised face, mặt phẳng, hoặc RTJ (Loại vòng chung)
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. Kiểm tra áp suất

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.

sasa thuôn dài provides blind flange boards in multiple pressure ratings (150 ĐẾN 2500 lớp học, PN10 đến 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:

Loại mặt bích	Central Hole	Mục đích
Cổ hàn	Đúng	Permanent pipe connection
Trượt trên	Đúng	Easy to slide over pipe ends
Ổ cắm hàn	Đúng	For small diameter high-pressure pipes
Có ren	Đúng	Connects to threaded pipes
Lập doanh	Đúng	Works with stub ends
Mặt bích mù	KHÔNG	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, nhiệt độ, and the nature of the fluid in the system:

Thép cacbon (A105, A350 LF2) – For general service
Thép không gỉ (304, 316, 321) – For corrosion resistance
Thép hợp kim (F11, F22, F91) – For high temperature and pressure
Song công/Siêu song công – For offshore and chemical applications
Hợp kim niken (Hastelloy, Inconel, Monel) – For highly corrosive environments

sasa thuôn dài 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 – Mặt bích ống và phụ kiện mặt bích (½” đến 24″)
ASME B16.47 Dòng A/B – For larger diameter flanges (26″ đến 60″)
EN 1092-1 – Tiêu chuẩn Châu Âu
DIN 2527 – German blind flange standard
JIS B2220 – Japanese standard

Each standard specifies dimensions, lớp áp lực, đối mặt với các loại, and tolerance limits.

Pressure Ratings and Thickness

Blind flanges are subject to full internal pressure since there is no flow-through. Vì thế, they are typically dày hơn than regular flanges of the same size and pressure class.

Lớp áp lực (ASME):

Lớp học 150
Lớp học 300
Lớp học 600
Lớp học 900
Lớp học 1500
Lớp học 2500

Blind flanges must be selected based on áp suất và nhiệt độ thiết kế 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:

Mặt nâng lên (RF) – Standard for most process piping
Mặt phẳng (FF) – Used where flanges are cast iron or non-metallic
Loại vòng chung (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
Low maintenance
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.

Hướng dẫn cài đặt

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 (mô hình ngôi sao)
Tighten in stages to ensure even compression
Recheck bolt torque after system pressurization

Improper installation can lead to gasket failure hoặc mặt bích cong vênh, resulting in leaks or blowouts.

sasa thuôn dài 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?

Tại sasa thuôn dài, we specialize in the manufacture and global supply of high-quality blind flange boards:

Tuân thủ ASME, DIN, JIS, EN tiêu chuẩn
Lựa chọn vật liệu rộng, bao gồm cả thép không gỉ, hợp kim, và thép cacbon
Custom machining for size, độ dày, or special surface finishes
Corrosion-resistant coatings upon request
Fast delivery and export-ready packaging

Cho dù bạn đang xây dựng một đường ống, bình áp lực, or process system, sasa thuôn dài ensures your blind flanges are precision-engineered for safety, sức mạnh, và hiệu suất.

Phần kết luận

Blind flange boards are more than just solid disks—they are crucial safety components trong hệ thống điều áp. They block flow, hệ thống cô lập, 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, coi như khả năng tương thích vật liệu, lớp áp lực, kiểu khuôn mặt, và tuân thủ tiêu chuẩn. For high-performance blind flange boards backed by expert support, lòng tin sasa thuôn dài—your reliable partner in industrial piping components.