Что вы знаете о досках с глухими фланцами?

В промышленных трубопроводных системах, blind flange boards—commonly referred to as глухие фланцы—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, изоляция, or future expansion capability.

This article explores everything you need to know about blind flange boards, including their structure, functions, материалы, отраслевые стандарты, и приложения. 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?

А 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.

Ключевые особенности:

Round metal disk with bolt holes
No internal opening or passage
Often manufactured with raised face, плоское лицо, или РТДЖ (Кольцевое соединение типа)
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. Испытание давлением

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.

Сасафланж provides blind flange boards in multiple pressure ratings (150 к 2500 сорт, 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:

Тип фланца	Central Hole	Purpose
Сварная шейка	Да	Permanent pipe connection
без шнуровки	Да	Easy to slide over pipe ends
Муфтовая сварка	Да	For small diameter high-pressure pipes
Резьбовой	Да	Connects to threaded pipes
коленный сустав	Да	Works with stub ends
Глухой фланец	Нет	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, температура, and the nature of the fluid in the system:

Углеродистая сталь (А105, А350 ЛФ2) – For general service
Нержавеющая сталь (304, 316, 321) – For corrosion resistance
Легированная сталь (F11, F22, F91) – For high temperature and pressure
Дуплекс/Супер Дуплекс – For offshore and chemical applications
Никелевые сплавы (Хастеллой, Инконель, Монель) – For highly corrosive environments

Сасафланж 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 (½» до 24″)
ASME B16.47 Серия А/Б – Для фланцев большего диаметра (26″ до 60″)
EN 1092-1 – Европейский стандарт
DIN 2527 – German blind flange standard
JIS B2220 – Japanese standard

Each standard specifies dimensions, классы давления, типы облицовки, and tolerance limits.

Pressure Ratings and Thickness

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

Классы давления (ASME):

Сорт 150
Сорт 300
Сорт 600
Сорт 900
Сорт 1500
Сорт 2500

Blind flanges must be selected based on расчетное давление и температура 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:

Поднятое лицо (РФ) – Standard for most process piping
Плоское Лицо (ФФ) – Used where flanges are cast iron or non-metallic
Кольцевое соединение типа (РТЖ) – 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
Низкие эксплуатационные расходы
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.

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?

В Сасафланж, we specialize in the manufacture and global supply of high-quality blind flange boards:

Соответствие ASME, DIN, JIS, EN стандарты
Широкий выбор материалов, включая нержавеющую сталь, сплав, и углеродистая сталь
Custom machining for size, толщина, or special surface finishes
Corrosion-resistant coatings upon request
Fast delivery and export-ready packaging

Строите ли вы трубопровод, сосуд под давлением, or process system, Сасафланж ensures your blind flanges are precision-engineered for safety, сила, и производительность.

Заключение

Blind flange boards are more than just solid disks—they are crucial safety components в системах под давлением. 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, учитывать совместимость материалов, класс давления, тип лица, and standard compliance. For high-performance blind flange boards backed by expert support, доверять Сасафланж—your reliable partner in industrial piping components.