Tipe Flensa	Kemampuan Tekanan	Penggunaan Umum
Leher Las	Tinggi	Tekanan tinggi, high-temp pipelines
Tergelincir	Sedang	General low-pressure systems
Pengelasan Soket	Tinggi (small bore)	Small-diameter high-pressure lines
Buta	Sangat tinggi	System termination points
Sambungan Putaran	Rendah hingga sedang	Non-critical, dismantling needed
berulir	Rendah	Tekanan rendah, no-weld applications

Untuk sistem bertekanan tinggi, weld neck or socket weld flanges are typically selected.

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

• Gasket logam (luka spiral, 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:

• Wajah Terangkat (Federasi Rusia)

• Sambungan Tipe Cincin (RTJ)

• Wajah Datar (FF)

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

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6. Pipeline Media and Corrosion Conditions

Itu nature of the fluid or gas transported also impacts flange selection. Corrosive or aggressive media (such as acids, asin, high-pressure steam, atau hidrokarbon) can degrade flange material, reducing its pressure resistance over time.

Mempertimbangkan:

• Stainless steel or nickel alloy flanges for aggressive fluids

• Corrosion allowances and lining options for carbon steel flanges

• NACE MR0175 kepatuhan for sour service in oil & gas

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

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7. Kondisi Lingkungan

Beyond internal conditions, itu lingkungan eksternal can also influence the longevity and pressure performance of the flange:

• Platform lepas pantai 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 Bagian VIII untuk bejana tekan

• EN 13480 for European industrial piping

• PED, NORWEGIA, API, dan standar ISO for regional or industry-specific compliance

These codes define:

• Allowable stress values

• Flange design verification

• Pressure test protocols

• Inspection and documentation requirements

sasa lonjong 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, mempertimbangkan 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 atau limited availability. For urgent projects, choosing a more readily available pressure class can ensure timely delivery.

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

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Kesimpulan

Selecting the right pressure rating for a connecting flange requires a comprehensive understanding of system pressure, suhu, media, sifat material, and applicable standards. Overlooking even one factor can lead to system failure, bahaya keselamatan, or compliance issues.

Ketika ragu, always consult pressure-temperature rating tables, design engineers, or your flange supplier. A well-chosen flange ensures the long-term safety and efficiency dari sistem perpipaan.

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