On this page 5 sections
Key features of spectacle blinds
- Positive isolation
- ASME B16.48
- Paddle blinds and spacers
- Class 150 – 2500
Spectacle Blinds by material
Spectacle Blinds are available in the following grades. Select a grade for specifications and sizes.
Stainless Steel
- SS 304 Spectacle Blinds
- SS 304L Spectacle Blinds
- SS 304H Spectacle Blinds
- SS 309S Spectacle Blinds
- SS 310S Spectacle Blinds
- SS 316 Spectacle Blinds
- SS 316L Spectacle Blinds
- SS 316Ti Spectacle Blinds
- SS 317 Spectacle Blinds
- SS 317L Spectacle Blinds
- SS 321 Spectacle Blinds
- SS 321H Spectacle Blinds
- SS 347 Spectacle Blinds
- SS 347H Spectacle Blinds
- SS 410 Spectacle Blinds
- SS 904L Spectacle Blinds
- Duplex 2205 Spectacle Blinds
- Super Duplex 2507 Spectacle Blinds
- SS 254 SMO Spectacle Blinds
Nickel Alloys
- Inconel 600 Spectacle Blinds
- Inconel 601 Spectacle Blinds
- Inconel 625 Spectacle Blinds
- Inconel 718 Spectacle Blinds
- Incoloy 800 Spectacle Blinds
- Incoloy 800H Spectacle Blinds
- Incoloy 800HT Spectacle Blinds
- Incoloy 825 Spectacle Blinds
- Monel 400 Spectacle Blinds
- Hastelloy C22 Spectacle Blinds
- Hastelloy C276 Spectacle Blinds
- Nickel 200 Spectacle Blinds
- Nickel 201 Spectacle Blinds
Carbon Steel
Alloy Steel
Spectacle Blinds: sizes, finishes and testing
- Size range
- NPS ½" – 24" (B16.5), 26" – 60" (B16.47 Series A/B); Class 150, 300, 600, 900, 1500, 2500; EN 1092-1 PN 6 – PN 100 on request
- Finish
- Raised face (RF), flat face (FF) or ring-type joint (RTJ); serrated spiral or concentric face finish (typically 3.2 – 6.3 µm Ra)
- Ends
- Weld-neck bevel matched to pipe schedule; socket bore; threaded
Testing & documents
- Chemical and mechanical tests of the forging
- Dimensional inspection to ASME B16.5 / B16.47
- Hardness, impact and IGC tests as specified
- Ultrasonic testing of forgings on request
- EN 10204 3.1 certificate; 3.2 with third-party inspection
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Other flanges types
Frequently asked questions
What sizes are spectacle blinds available in?
NPS ½" – 24" (B16.5), 26" – 60" (B16.47 Series A/B); Class 150, 300, 600, 900, 1500, 2500; EN 1092-1 PN 6 – PN 100 on request.
Which specifications cover spectacle blinds?
ASME B16.48.
What are spectacle blinds used for?
ASME B16.48. They're made to ASME B16.48, and paddle blinds and spacers are also available.
Which materials are spectacle blinds available in?
Stainless steel, nickel alloys, carbon and alloy steel and non-ferrous metals, depending on the specification. See the material list above.