Flanges são componentes essenciais em sistemas de tubulação, tubos de conexão, válvulas, bombas, e outros equipamentos. No entanto, nem todos os flanges são criados iguais. One of the most important factors to consider when selecting a flange is its classificação de pressão. This rating determines the maximum pressure the flange can handle under specific temperature conditions. Neste artigo, we will explain what flange pressure ratings are, como eles funcionam, and why they matter in industrial applications.

As a professional flange supplier, sasa oblonga offers a wide range of pressure-rated flanges to meet the demands of different industries and applications. Understanding these ratings can help you select the right flange for your project and ensure safety, durabilidade, e conformidade.

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O que são classificações de pressão do flange?

Flange pressure ratings, também conhecido como aulas de pressão, indicate the amount of internal pressure a flange can safely withstand at a given temperature. These ratings are defined by international standards such as:

• ASME B16.5 (used in the US and internationally)

• EN 1092-1 (European standard)

• DIN (German standards)

Common pressure ratings in ASME B16.5 incluir:

• Aula 150

• Aula 300

• Aula 600

• Aula 900

• Aula 1500

• Aula 2500

Each class refers to a range of pressure capacities, not a fixed number of pounds per square inch (psi).

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Pressure Rating vs Actual Pressure

It is important to note that a Class 150 flange does não mean it can handle exactly 150 psi. The pressure capacity varies depending on:

• Flange material

• Temperatura operacional

• Corrosion allowance

• Cronograma de tubulação

Por exemplo, uma aula 150 stainless steel flange may handle 285 psi a 100°F, but its capacity decreases as the temperature increases.

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Temperature Effects on Pressure Ratings

Flange pressure ratings are temperature-dependent. The higher the temperature, the lower the pressure rating. This is due to the weakening of the flange material at elevated temperatures.

Por exemplo:

• Aula 300 flange in carbon steel may handle:

  • 570 psi a 100°F

  • 260 psi at 600°F

Different materials (like stainless steel or alloy steel) will have different reductions in capacity.

sasa oblonga provides material-specific pressure rating tables to help customers select the right flange under their expected temperature range.

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Flange Rating Conversion: ASME vs EN

If you work with global suppliers, you may encounter different rating systems: