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- Email: john@yxs-forging.com
Spectacle Blind
Spectacle Blind
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A Spectacle Blind is a line isolation component used in piping systems to provide positive shut-off during maintenance, inspection, or process changeover. It consists of a solid blind end and an open ring end connected by a web, allowing operators to switch between flow service and line blanking as required.
Compared with a standard blind flange, a spectacle blind is not intended to act as a conventional end flange. Instead, it is typically installed between flange connections in process piping systems where visible and reliable line isolation is required. This makes it widely used in refineries, petrochemical plants, power stations, and other industrial piping networks.
We can supply spectacle blinds in forged carbon steel, stainless steel, alloy steel, and other specified materials. Available production can be based on ASME B16.48, project standards, or customer drawings. Products may be supplied as forged blanks, rough machined pieces, or finished spectacle blinds depending on dimensional and service requirements.
| Parameter | Description |
|---|---|
| Key Features | Combined blind plate and spacer ring design, visual indication of line status, easy switching between open/closed positions |
| Typical Materials | A105, A182 F304/F316, A350 LF2, A182 F11/F22, per drawing |
| Applicable Standards | ASME B16.48, ASME B16.5, EN 1092-1, project custom |
| Pressure Class | Class 150 / 300 / 600 / 900 / 1500 / 2500 (ASME), PN10~PN160 (EN) |
| Size Range | 1/2"~24" (DN15~DN600) as standard; larger sizes per drawing |
| Facing Type | RF / FF / RTJ (RTJ available for high-pressure service) |
| Thickness Control | Blind plate and spacer ring thickness matched to flange rating and gasket type |
| Bolt Hole Accuracy | Bolt circle diameter and hole alignment controlled to standard or drawing |
| Supply Condition | As-forged / Normalized / Quenched & tempered / Rough machined / Finished |
| Marking | Permanent marking with size, rating, material, heat/lot number, and “BLIND” / “SPACER” identification |
| Inspection & Docs | EN 10204 3.1 / MTC, dimensional inspection report, PMI (as required), MT/PT on sealing faces, traceability list |
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