Haihao Group Ships ASME B16.48 Spectacle Blind Flange to Australia

Haihao Group has successfully completed the production and delivery of a 6 inch Class 300 spectacle blind flange for a valued customer in Australia.

The supplied product is manufactured in strict accordance with ASME B16.48 and designed to be installed between raised face (RF) flanges as per ASME B16.5. Produced from ASTM A516 Grade 60 carbon steel, the spectacle blind ensures reliable isolation performance in pipeline systems requiring periodic maintenance or flow control.

Product Specifications

The delivered item includes the following technical details:

• Product: Spectacle Blind (Figure 8 Blind) – RF Type

• Size: 6 inch

• Pressure Rating: Class 300 (300 lbs)

• Standard: ASME B16.48

• Flange Compatibility: ASME B16.5 Raised Face (RF)

• Material: ASTM A516 Grade 60

• Tag No.: C2FGMKM

This ASME B16.48 6 inch 300 lb spectacle blind flange is engineered for secure line isolation and safe plant operation.

What Is a Spectacle Blind Flange?

A spectacle blind (figure 8 blind flange) consists of a solid blind plate and a ring spacer connected by a steel web. It allows operators to easily switch between flow and isolation conditions without removing the flange assembly completely.

Compared with traditional blind flanges, the figure 8 blind flange for Class 300 piping systems offers:

• Safer and faster line isolation

• Clear visual confirmation of line status

• Reduced maintenance time

• Reliable sealing between RF flanges

This makes it widely used in oil & gas plants, refineries, power stations, and industrial pipeline systems.

Why ASTM A516 Gr.60 for Spectacle Blinds?

ASTM A516 Grade 60 carbon steel is commonly selected for pressure vessel and piping components due to:

• Good strength under moderate pressure

• Reliable toughness

• Excellent weldability

• Stable performance in industrial environments

For Class 300 carbon steel spectacle blind flanges, A516 Gr.60 provides dependable mechanical properties while remaining cost-effective for large-scale projects.

Quality Control and Manufacturing Standards

Each spectacle blind flange manufactured by Haihao Group undergoes:

• Dimensional inspection

• Material verification

• Surface finishing inspection

• Marking and traceability control

Strict compliance with ASME B16.48 spectacle blind flange requirements ensures dimensional accuracy and compatibility with ASME B16.5 raised face flanges.

Supporting International Pipeline Projects

With extensive export experience, Haihao Group continues to supply carbon steel spectacle blind flanges, blind flanges, and specialty pipeline components to global customers.