Recurso	Standard Flange	Flange Blind Plate
Central Opening	Sim	Não
Propósito	Connect pipes and components	Seal or close pipe ends
Flow Passage	Allows fluid flow	Blocks fluid flow
Uso Comum	Permanent or semi-permanent piping connections	Temporary or permanent pipe closure
Aplicativo	Bombas, válvulas, cotovelos, camisetas	Ends of pipelines, nozzles
Teste de pressão	Not primarily used	Ideal for pressure testing systems
Projeto	With bore and gasket surface	Solid with full face or raised face
Instalação	Welded or bolted to pipes	Bolted to pipe or flange end

Applications of Standard Flanges

Standard flanges are used throughout industrial piping systems to:

• Connect two pipe sections

• Allow the installation of valves, filtros, or strainers

• Facilitate maintenance and inspection

• Accommodate thermal expansion or vibration

They are integral to systems requiring frequent assembly and disassembly.

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Applications of Flange Blind Plates

Flange blind plates are typically used when:

• Temporarily isolating a section of piping for maintenance

• Permanently sealing a dead-end in a pipeline

• Teste de pressão sections of piping systems or vessels

• Future expansion is expected but not yet installed

Por exemplo, in petrochemical plants, a blind flange is placed at the end of a high-pressure line that might later connect to another process unit.

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Materials Used in Flanges and Blind Flanges

Both components are made using similar materials depending on application, como:

• Aço inoxidável (304, 316, 321, etc.)

• Aço carbono

• Liga de aço (F11, F22, etc.)

• Duplex e Super Duplex

• Nickel-based alloys

sasa oblonga provides both standard and blind flanges in a wide range of materials, tamanhos, aulas de pressão (ANSI, DIN, JIS), and surface finishes.

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Considerações sobre instalação e manutenção

Standard Flanges:

• Require proper gasket alignment

• Must be torqued in a star pattern

• Pipe sections must be well alinhado

• Suitable for frequent assembly/disassembly

Flange Blind Plates:

• Must match bolt pattern and pressure class

• Must be properly centered to avoid over-stressing bolts

• Often require thicker gaskets for tight sealing

• Used with reinforcement pads in high-pressure conditions

Both types require proper torque and gasket selection for leak-proof performance. sasa oblonga recommends following ASME B16.5 ou PT 1092-1 standards for installation best practices.

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Pressure Rating and Strength

Blind flanges are often subject to higher internal pressure than standard flanges because they bear the full force of the pressurized medium.

Hence, flange blind plates:

• Are usually mais grosso than regular flanges

• May include reinforcing ribs ou raised face designs

• Are rated to match or exceed the pipe system’s maximum pressure

For high-pressure systems, choosing a well-machined blind flange from a trusted supplier like sasa oblonga ensures long-term reliability.

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Which One Should You Use?

It depends entirely on the application: