METAGLAS® Type 177 ANSI – Metal-Fused Sight Glass for Flow Indicator Fittings

The METAGLAS® Type 177 ANSI is a precision-engineered metal-fused sight glass designed for flow indicator fittings with traction. Built to ANSI fitting dimensions and similar in design to DIN 7079, this unit delivers robust, pressure-resistant visibility for a wide range of industrial process applications.

By fusing the glass directly into a machined metal ring, the assembly generates permanent compressive stress within the glass, offering superior mechanical stability, thermal shock resistance, and long-term sealing integrity compared to conventional sight glass constructions.

Design & Construction

• Type: Metal-fused sight glass for flow indicator fittings with traction
• Standard: ANSI fitting dimensions (similar to DIN 7079)
• Mounting: For use in sight flow indicator assemblies and piping systems to ANSI standards
• Seal Type: Fused metal-glass joint – no gaskets required
• Pressure/Temperature Capability: Dependent on size and material grade (details available on request)

Applications

• Flow indicator fittings for liquid and gas pipelines
• Process monitoring in chemical and petrochemical plants
• Steam and condensate systems requiring ANSI compatibility
• Oil & gas, power generation, and industrial utility processes
• Replacement for standard DIN 7079-type sight glasses in existing equipment

John Moncrieff Ltd supplies certified METAGLAS® Type 177 ANSI assemblies for process and instrumentation visibility systems — precision-manufactured, pressure-tested, and fully compliant with ANSI and PED requirements.

Technical Specifications: