Spade type Blind Flanges

Key Features

• Positive Isolation: Provides a reliable physical barrier to stop flow in the pipeline.
• Simple Installation: Installed by inserting between two flanges and tightening bolts.
• Interchangeable Use: Often paired with a spacer for easy switching between open and closed positions.
• Clear Identification: Usually equipped with a handle for easy handling and visibility.
• Robust Construction: Suitable for high-pressure and high-temperature applications.

Standards

• ASME B16.48 (Line Blanks)
• API 590 (Recommended Practice)
• Custom designs available per project requirements

Material

• Carbon Steel (e.g., ASTM A516 Gr.60/70)
• Stainless Steel (e.g., ASTM A240 304 / 316)
• Alloy Steel (upon request)

Size Range

• NPS: 1/2” – 48” (DN15 – DN1200)

Pressure Rating

• Class 150 / 300 / 600 / 900 / 1500 / 2500

Types

• Spade (Paddle Blind): Solid plate used to block flow
• Spacer (Ring Spacer): Open ring used to allow flow
• Spectacle Blind: Combination of spade and spacer connected by a web

Facing Type

• Raised Face (RF)
• Ring Type Joint (RTJ)

Surface Treatment

• Anti-rust oil
• Black painting
• Galvanized or coated (optional)

Applications

• Oil & Gas pipelines
• Petrochemical plants
• Refineries
• Power generation facilities
• Offshore and onshore piping systems

Inspection & Testing

• Dimensional inspection
• Visual inspection
• Material certification (EN 10204 3.1)
• Optional NDT (UT, PT)

Marking

• Size (NPS/DN)
• Pressure class
• Material grade
• Standard (e.g., ASME B16.48)
• Heat number / Manufacturer’s mark