Joining, flanges and sealing
Blind flange
Closing a line end or providing positive isolation
Specialist selection guide
What should be reviewed before selecting this product?
A blind flange closes a line end or nozzle without a bore and carries full pressure as a plate in bending. At large size and high class, weight, bolt load, removal space and handling method become major considerations.
Technical selection path
- 1
Match size, class and facing to the mating flange
- 2
Check material grade and pressure-temperature range
- 3
Select gasket and bolting for the facing
- 4
Plan weight and lifting method
- 5
Specify vent, drain or instrument tapping needs
Key strengths
- Dependable line-end closure
- Removable for inspection or future extension
- Compatibility with standard flanged joints
Selection limitations
- High weight at large size and class
- Needs removal space and handling tools
- Trapped pressure must be relieved before opening
Typical applications
Where can this option be considered?
- Temporary or permanent line ends
- Spare equipment nozzles
- Periodic inspection access
Reference standards
A standard does not replace the project specification
Common technical questions
Concise answers before enquiry
Can a blind flange be opened under pressure?
No. The line must be positively isolated, depressurised, drained and verified under an approved safe-work procedure.
Is a blind flange as thick as a weld-neck flange?
Not necessarily. A blind has no central bore and has its own standard dimensions based on plate-bending duty.
Line ends, future tie-ins, testing or maintenance
Trapped pressure, venting, safe removal procedure and wall thickness
Initial review sheet
Technical attributes to review
Final values must come from project specifications, calculations and manufacturer data. This table defines the information scope.
FamilyIndustrial flanges
Main groupJoining, flanges and sealing
Materials to evaluateCarbon steel, Stainless steel, Alloy steel, Low-temperature steel
Connections to evaluateWelded, Threaded, Socket, Loose/lap
Typical mediaAll piping services
Relevant industriesOil and gas, Refining, Petrochemical, Power generation, Water and utilities
Reference standardsASME B16.5 · ASME B16.47 · ASME B16.36 · API 6A · EN 1092-1 · BS 10
Enquiry checklist
Include this information with your request
Standard and class
Nominal size
Facing
Material and grade
Pipe schedule
Drilling and dimensions
Before substitution
A matching name does not guarantee interchangeability
Installation dimensions, pressure rating, wetted materials, sealing design, construction standard, testing and documentation must be checked independently.
Adjacent types
Other options in this family
Final technical approval is required
This page is educational and intended for initial screening. Final selection must be approved against project requirements, actual service conditions and manufacturer documentation.
Send request for review