Тип фланца	Pressure Capability	Общее использование
Сварная шейка	Высокий	Высокое давление, high-temp pipelines
без шнуровки	Умеренный	General low-pressure systems
Муфтовая сварка	Высокий (small bore)	Small-diameter high-pressure lines
Слепой	Very high	System termination points
коленный сустав	Low to moderate	Non-critical, dismantling needed
Резьбовой	Низкий	Низкое давление, no-weld applications

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

Сасафланж 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 герметичность is also influenced by the type of gasket used and the bolt load that the flange can handle. High-pressure classes generally require:

• Металлические прокладки (спиральная рана, РТЖ)

• 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:

• Поднятое лицо (РФ)

• Кольцевое соединение типа (РТЖ)

• Плоское Лицо (ФФ)

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

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6. Pipeline Media and Corrosion Conditions

The nature of the fluid or gas transported also impacts flange selection. Corrosive or aggressive media (such as acids, соленая вода, high-pressure steam, или углеводороды) 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 согласие for sour service in oil & газ

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

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7. Условия окружающей среды

Beyond internal conditions, тот external environment can also influence the longevity and pressure performance of the flange:

• Морские платформы require high-grade stainless or duplex flanges

• Outdoor exposure demands UV and corrosion-resistant coatings

• Cryogenic environments need low-temperature impact-tested flanges (А350 ЛФ2)

Temperature differentials, salt exposure, 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 Раздел VIII для сосудов под давлением

• EN 13480 for European industrial piping

• ПЭД, НОРВЕГИЯ, API, and ISO standards for regional or industry-specific compliance

These codes define:

• Allowable stress values

• Flange design verification

• Pressure test protocols

• Inspection and documentation requirements

Сасафланж supplies pressure-rated flanges with full documentation packages, including EN10204 3.1/3.2, PMI, ЮТ, and pressure test reports.

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9. Future Expansion or Modification

When designing a pipeline, учитывать future changes in system pressure, flow rate, 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 или limited availability. For urgent projects, choosing a more readily available pressure class can ensure timely delivery.

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

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Заключение

Selecting the right pressure rating for a connecting flange requires a comprehensive understanding of system pressure, температура, СМИ, material properties, and applicable standards. Overlooking even one factor can lead to system failure, угрозы безопасности, or compliance issues.

Когда сомневаешься, always consult pressure-temperature rating tables, design engineers, or your flange supplier. A well-chosen flange ensures the long-term safety and efficiency системы трубопроводов.

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