نوع شفة	Pressure Capability	Common Use
لحام الرقبة	عالي	ارتفاع الضغط, high-temp pipelines
سهل الارتداء	معتدل	General low-pressure systems
لحام المقبس	عالي (small bore)	Small-diameter high-pressure lines
أعمى	عالية جدا	System termination points
اللفة المشتركة	Low to moderate	Non-critical, dismantling needed
مترابطة	قليل	Low-pressure, no-weld applications

For high-pressure systems, weld neck or socket weld flanges are typically selected.

ساسا مستطيل offers all standard flange types, machined and tested to meet pressure design conditions.

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5. Gasket Type and Bolt Load

The flange’s أداء الختم is also influenced by the type of gasket used and the bolt load that the flange can handle. High-pressure classes generally require:

• جوانات معدنية (الجرح الحلزوني, آر تي جيه)

• Higher bolt torque

• Greater flange thickness and strength

Ensure that the gasket material and geometry are compatible with the flange face finish and pressure class.

Common flange faces include:

• وجه مرفوع (الترددات اللاسلكية)

• نوع الحلقة المشتركة (آر تي جيه)

• وجه مسطح (FF)

ساسا مستطيل provides matching gasket sets and bolting specifications for their pressure-rated flange assemblies.

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6. Pipeline Media and Corrosion Conditions

ال nature of the fluid or gas transported also impacts flange selection. Corrosive or aggressive media (such as acids, المياه المالحة, high-pressure steam, أو الهيدروكربونات) can degrade flange material, reducing its pressure resistance over time.

Consider:

• Stainless steel or nickel alloy flanges for aggressive fluids

• Corrosion allowances and lining options for carbon steel flanges

• NACE MR0175 امتثال for sour service in oil & غاز

ساسا مستطيل provides material compatibility recommendations based on specific pipeline fluids and service conditions.

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7. الظروف البيئية

Beyond internal conditions, ال البيئة الخارجية can also influence the longevity and pressure performance of the flange:

• المنصات البحرية require high-grade stainless or duplex flanges

• Outdoor exposure demands UV and corrosion-resistant coatings

• Cryogenic environments need low-temperature impact-tested flanges (A350 LF2)

Temperature differentials, التعرض للملح, and humidity can cause flange degradation if not considered in material and pressure class selection.

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8. System Design Codes and Regulatory Compliance

Flanges must comply with project-specific and regional codes:

• ASME B31.3 for process piping

• ASME القسم الثامن لأوعية الضغط

• EN 13480 for European industrial piping

• بيد, النرويج, API, ومعايير الأيزو for regional or industry-specific compliance

These codes define:

• Allowable stress values

• Flange design verification

• Pressure test protocols

• Inspection and documentation requirements

ساسا مستطيل supplies pressure-rated flanges with full documentation packages, including EN10204 3.1/3.2, مؤشر مديري المشتريات, يوتا, and pressure test reports.

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9. Future Expansion or Modification

When designing a pipeline, يعتبر future changes in system pressure, معدل التدفق, or temperature. If the system may undergo upgrades, it’s safer to choose a higher pressure class flange from the outset.

A slightly higher upfront cost can prevent expensive rework or system downtime later.

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10. Availability and Lead Time

Some pressure classes or material combinations may have longer lead times أو limited availability. For urgent projects, choosing a more readily available pressure class can ensure timely delivery.

ساسا مستطيل maintains a large stock of Class 150 ل 900 and PN10 to PN64 flanges in common sizes and materials for rapid dispatch.

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خاتمة

Selecting the right pressure rating for a connecting flange requires a comprehensive understanding of system pressure, درجة حرارة, وسائط, material properties, and applicable standards. Overlooking even one factor can lead to system failure, مخاطر السلامة, or compliance issues.

عندما تكون في شك, always consult pressure-temperature rating tables, design engineers, or your flange supplier. A well-chosen flange ensures the long-term safety and efficiency من نظام الأنابيب.

With certified manufacturing, expert engineering, and global supply capabilities, ساسا مستطيل is your trusted partner for selecting and supplying the correct pressure-rated flanges for any project.