فلنجات اللحام المسطحة سهلة الارتداء لأنابيب الخدمة المتوسطة

في عالم الأنابيب الصناعية, تعد الحلول الفعالة من حيث التكلفة أمرًا ضروريًا - خاصة في الأنظمة التي تكون فيها ظروف الضغط ودرجة الحرارة معتدلة. من بين خيارات شفة مختلفة, ال 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, التطبيقات, installation methods, 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, التدفئة والتهوية وتكييف الهواء, البتروكيماويات, and general construction.

What Is a Flat Welding Flange?

أ 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 يكتب 01 أو 02 – For European specifications
JIS B2220 – For Japanese standard flanges

ساسا مستطيل 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
وجه مرفوع (الترددات اللاسلكية) أو وجه مسطح (FF): Options depending on sealing needs
No long tapered hub: Compact and lightweight
Fillet welds: Applied on both sides to secure the pipe
فتحات الترباس: Equally spaced to match standard bolt patterns

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

Advantages of Flat Welding Flanges

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. هُم 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 (ماء, هواء, زيت)
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:

فئات الضغط: 150#, 300#, PN10, PN16
الأحجام: DN15 to DN2000
تواجه أنواع: الترددات اللاسلكية, FF, and RTJ
مواد: الصلب الكربوني, الفولاذ المقاوم للصدأ, سبائك الصلب

ساسا مستطيل offers quick delivery of standard and customized flat welding flanges for global projects.

التطبيقات النموذجية لفلنجات اللحام المسطحة

● Water Supply and Drainage

Used in municipal pipelines, محطات الضخ, and wastewater treatment plants due to corrosion-resistant coatings and simple connections.

● أنظمة التدفئة والتهوية وتكييف الهواء

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

● مصانع الكيماويات والبتروكيماويات

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

● تجهيز الأغذية والمشروبات

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:

تحضير الأنابيب
- Cut the pipe to the required length
- Clean the pipe end to remove oil, الأوساخ, or burrs
وضع شفة
- حرك الحافة فوق نهاية الأنبوب
- Align the bolt holes with mating flange or template
لحام
- Perform a fillet weld on the inner side of the pipe end
- اتبع مع لحام فيليه الخارجي around the flange face
Gasket Insertion and Bolt Tightening
- Place the gasket (الجرح الحلزوني, ممحاة, إلخ.)
- Insert bolts and tighten in a cross-pattern using a torque wrench
- Follow appropriate torque sequence to ensure uniform pressure
Testing and Inspection
- Conduct hydrostatic or pneumatic testing to check for leaks
- Visually inspect welds for quality and completeness

ساسا مستطيل supplies flanges with precision machining, making installation smooth and consistent.

خيارات المواد

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

الكربون الصلب (ASTM A105, P245GH): Affordable and strong for general use
الفولاذ المقاوم للصدأ (304, 316, 321): Corrosion-resistant for chemical and food applications
سبائك الصلب (F11, F22): Used in moderate temperature and pressure environments
دوبلكس ستانلس ستيل: Offers superior strength and corrosion resistance
سبائك النيكل: For specialized systems requiring chemical resistance

Surface treatments may include:

Galvanizing
Epoxy coating
التخميل
Pickling and polishing

ساسا مستطيل offers material traceability, EN10204 3.1 شهادات, and special coatings upon request.

تقييمات ومعايير الضغط

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

ASME B16.5 فصول: 150#, 300#
EN 1092-1 فئات الضغط: PN6, PN10, PN16
JIS B2220 فصول: 5ك, 10ك, 16ك

Always select the correct pressure class and material based on system pressure, درجة حرارة, ونوع السوائل.

التفتيش ومراقبة الجودة

لضمان السلامة والأداء, all flat welding flanges must undergo:

فحص الأبعاد
التحقق من المواد (مؤشر مديري المشتريات)
Flatness and facing finish check (را ≥ 3.2 ميكرومتر)
Bolt hole alignment
Visual inspection of welds (if factory-welded)
Hydro or air leak testing if assembled

ساسا مستطيل يحافظ ISO 9001-certified quality systems and third-party inspection cooperation (اس جي اس, بي.في, توفالو).

لماذا تختار ساسافلانج?

ساسا مستطيل is a professional flange manufacturer serving global customers in energy, البتروكيماويات, ماء, ومشاريع البنية التحتية. وتشمل المزايا الرئيسية:

Full range of flat welding flanges in ASME, EN, DIN, JIS, and GOST standards
Manufacturing in stainless steel, الصلب الكربوني, وسبائك خاصة
التصنيع باستخدام الحاسب الآلي, التشطيب السطحي, and drilling
3.1/3.2 certified quality control and fast export support
أحجام مخصصة, الطلاءات, and gasket kits available

For budget-conscious projects or low-pressure pipelines, ساسا مستطيل delivers reliable flanged solutions with fast turnaround.

خاتمة

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

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