В промышленных трубопроводах, Выбор типа фланца существенно влияет как на стоимость, так и на эксплуатационную надежность.. When dealing with low-pressure pipeline systems, engineers and project managers often look for solutions that are safe, эффективный, and economical. One such solution is the плоский приварной фланец, also known as the накидной фланец. This type of flange provides an excellent balance of affordability and performance in non-critical piping environments.

В этой статье, мы будем исследовать design features, преимущества, application areas, способы установки, и material options of flat welding flanges. Whether you are engaged in infrastructure projects, химическая обработка, системы отопления, вентиляции и кондиционирования, or water treatment, this guide will help you understand why flat welding flanges are a practical choice—and how Сасафланж delivers quality you can trust.

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Что такое плоский приварной фланец?

А плоский приварной фланец 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.

Ключевые характеристики включают в себя:

• Flat sealing face

• Short radial profile

• Internal and external welds

• Suitable for low-pressure and low-temperature applications

Сасафланж manufactures flat welding flanges according to international standards such as ASME B16.5, EN 1092-1, JIS B2220, и DIN стандарты, offering full customization on size, материал, и тип облицовки.

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Why Flat Welding Flanges Are Ideal for Low-Pressure Systems

1. Экономичный дизайн

One of the primary reasons flat welding flanges are used in low-pressure pipelines is their экономическая эффективность. The simplified structure means:

• Less raw material consumption

• Более простая обработка

• 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 easy alignment и быстрая установка, 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. Это делает их пригодными для:

• Space-limited installations

• Skid-mounted equipment

• Lightweight support structures

4. Универсальность

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

• Carbon steel pipes

• Stainless steel pipelines

• Plastic or lined pipe systems (with adapters)

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

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Типичные применения плоских приварных фланцев

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, сок, 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.

Сасафланж provides industry-specific flange solutions with suitable surface finishes and gasket compatibility.

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How to Install a Flat Welding Flange

Шаг 1: Подготовка труб

• Cut the pipe to the correct length.

• Clean the pipe end and the inside surface of the flange.

• Remove rust, масло, or debris to ensure good weld quality.

Шаг 2: Размещение фланца

• Наденьте фланец на конец трубы.

• Align bolt holes with the mating flange.

• Maintain perpendicularity with respect to the pipe axis.

Шаг 3: Сварка

• Apply a fillet weld on the inner side фланца.

• Следуйте с внешний угловой шов around the pipe and flange edge.

• Use appropriate filler material and follow welding standards (ASME Раздел IX, ISO 15614).

Шаг 4: Gasket and Bolting

• Place the gasket between flange faces (резина, ПТФЭ, spiral wound depending on media).

• Insert bolts and tighten them using a cross-pattern sequence.

• Torque bolts gradually to ensure even load distribution.

Сасафланж offers flanges with precision-machined faces and bolt holes for easy, secure installation.

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Material Options for Flat Welding Flanges

Depending on the fluid medium, номинальное давление, и воздействие окружающей среды, flat welding flanges can be manufactured from:

• Углеродистая сталь (ASTM A105, P245GH): Widely used for general industrial and construction purposes.

• Нержавеющая сталь (304/304л, 316/316л): Ideal for corrosive environments like food processing and marine systems.

• Легированная сталь (F11, F22): For systems with moderate temperature and higher strength requirements.

• Дуплекс из нержавеющей стали: Provides higher corrosion resistance and mechanical strength.

• Galvanized or Epoxy Coated Steel: For extended corrosion resistance in water systems.

Сасафланж ensures full отслеживаемость материалов, offering flanges with EN 10204 3.1 или 3.2 сертификаты, along with NDT reports и pressure testing results.

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Номинальные значения давления и стандарты

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

• Классы ASME: 150#, 300#

• EN Номинальное давление: ПН6, PN10, PN16

• Стандарты JIS: 5К, 10К, 16К

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

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Surface Finishes and Coatings

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

• Machined raised face (РФ): For spiral wound or soft gaskets

• Плоское лицо (ФФ): For rubber or full-face gaskets

• Покрытия: Galvanized, окрашенный, epoxy powder-coated for corrosion protection

Сасафланж provides custom finishes upon request, ensuring compatibility with the operating environment.

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Инспекция и контроль качества

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

• Проверка размеров

• Визуальный осмотр

• Surface roughness check

• Material identification (PMI)

• Hydrostatic or pneumatic leak testing

В Сасафланж, all products are inspected and verified before dispatch. Clients may also request third-party inspections (СГС, ТУВ, БВ) as part of project documentation.

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Почему стоит выбрать сасафланец?

Сасафланж is a leading manufacturer of industrial flanges with a reputation for precision, надежность, и удовлетворенность клиентов. Наши преимущества включают в себя:

• Full range of flat welding flanges in ASME, EN, DIN, стандарты JIS

• Wide material selection and stock availability

• обработка с ЧПУ, индивидуальное бурение, and coating services

• Быстрая доставка with export packaging and documentation

• Technical support and compliance with international standards

Имея более чем десятилетний опыт, Сасафланж is trusted by clients in over 60 страны.

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Заключение

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