Spectacle Flanges
Spectacle Flanges, also called spectacle blinds, combine a solid blind portion and an opening portion in one assembly for positive isolation or flow service.
Technical Parameters
- Nominal size and pressure class
- Bore/opening size
- Blind and spacer dimensions
- Facing type
- Bolt circle and bolt-hole details
- Material and grade
- Applicable project/line-blank specification
- Identification, inspection and installation orientation
Line-Blank / Spectacle-Blind Standard
For line blanks, the applicable standard may include ASME B16.48. ASME's current catalogue lists B16.48-2025, while project specifications may still reference earlier editions. The exact spectacle-blind design should therefore be matched to the client's line-class and project specification.
Materials & Grades
BCUBE can evaluate Mild Steel, Carbon Steel, Alloy Steel and Stainless Steel flange requirements in grades applicable to the selected material and flange specification. Material selection must match the pressure, temperature, corrosion and project requirements.
Dimensions & Rating
Flange pages will organize technical information around nominal size, pressure class/PN rating, facing, bore, outside diameter, thickness, bolt circle, bolt-hole count/diameter and other product-specific dimensions. Numerical tables will be added after specification-by-specification verification.
Current, Previous & Project-Specified Editions
BCUBE's standards database will distinguish current editions from previous/historical editions. ASME B16.5, for example, has historical editions including 2020, 2017, 2013, 2009 and earlier versions. citeturn0search18 A project specifying an older edition should be evaluated against that requirement rather than silently substituted with the latest edition.
Manufacturing & Sourcing
BCUBE supports both manufacturing and sourcing. Requirements can be evaluated from flange type, size, class/PN, facing, bore, material, grade, standard, drawing and quantity.
Testing, Certification & Inspection
Applicable dimensional, visual, material and pressure-related testing will be described according to the governing specification. EN 10204:3.1 material certificates and Indian or international third-party inspection can be supported where required.
Applications
Oil & gas, EPC projects, chemical and petrochemical plants, power plants, water treatment, industrial equipment, fabrication, infrastructure and general industrial piping, subject to the selected flange specification and service requirements.
Related Products
Slip-On Flanges · Weld Neck Flanges · Blind Flanges · Threaded Flanges · Socket Weld Flanges · Lap Joint Flanges · Spectacle Flanges · Orifice Flanges