Flanschtyp	Pressure Capability	Common Use
Schweißhals	Hoch	Hochdruck, high-temp pipelines
Slip-On	Mäßig	General low-pressure systems
Muffenschweißen	Hoch (small bore)	Small-diameter high-pressure lines
Blind	Sehr hoch	System termination points
Überlappungsgelenk	Low to moderate	Non-critical, dismantling needed
Mit Gewinde	Niedrig	Unterdruck, no-weld applications

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

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

• Metallische Dichtungen (spiralförmig gewickelt, RTJ)

• 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:

• Erhöhtes Gesicht (RF)

• Ringgelenk (RTJ)

• Flaches Gesicht (FF)

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

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6. Pipeline Media and Corrosion Conditions

Der nature of the fluid or gas transported also impacts flange selection. Corrosive or aggressive media (such as acids, Salzwasser, high-pressure steam, oder Kohlenwasserstoffe) 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 Einhaltung for sour service in oil & Gas

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

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7. Environmental Conditions

Beyond internal conditions, Die äußere Umgebung can also influence the longevity and pressure performance of the flange:

• Offshore-Plattformen 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, 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 Abschnitt VIII für Druckbehälter

• EN 13480 for European industrial piping

• PED, NORWEGEN, API, und ISO-Standards for regional or industry-specific compliance

These codes define:

• Allowable stress values

• Flange design verification

• Pressure test protocols

• Inspection and documentation requirements

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

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9. Future Expansion or Modification

When designing a pipeline, halten 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 oder limited availability. For urgent projects, choosing a more readily available pressure class can ensure timely delivery.

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

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Abschluss

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

Im Zweifelsfall, always consult pressure-temperature rating tables, design engineers, or your flange supplier. A well-chosen flange ensures the long-term safety and efficiency des Rohrleitungssystems.

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