Sight Glass Indicators - Cast - GC | BLU ZAC

BLU ZAC GC Cast – Dual-Sided Flow Indicator

The BLU ZAC GC Cast is a dual-sided flow indicator designed for visual monitoring of fluid within piping systems. It features a one-piece cast body with two glass plates secured by two covers. It can be configured without an internal indicator or with a flow indication element, depending on the application.

Technical Specifications

• Sizes: 2" to 24"
• Connections: butt weld per ANSI B16.25 or flanges per ANSI B16.5
• Glass: borosilicate tempered, per DIN 7080
• Indication Options: no indication Type X, lug Type Y, ball Type Z, rotor Type W, pipe Type K, check valve Type V
• Max Glass Pressure: 51 bar up to 6", 25 bar from 8" to 24"
• Max Glass Temperature: 280 °C
• Body Materials: ASTM A216 WCB, A352 LCB, A351 CF8, A351 CF8M, A216 WC9
• Gaskets: graphite
• Bolts/Nuts: ASTM A193 / A320 and ASTM A194, per body material

Materials and Application Selection

Material selection is based on fluid, temperature, pressure, corrosion, and piping specification. CF8M is typically used where stainless compatibility is required, while WCB/WC9 covers steel applications per thermal load. Body limits are per ASME B16.34, but the indicator's final limit is constrained by glass, diameter, and operating condition.

Typical Applications

• steam lines
• tracing lines
• turbine lines
• marine applications
• presses
• industrial liquid or gas networks

Installation and Maintenance

The indicator can operate in any position, with horizontal installation preferred. Line isolation, venting, and hazardous residue checks are required before maintenance. During reassembly, gaskets are replaced, and startup is gradual with leakage checks.

FAQ

Does it accept an actuator?
No. It is a passive flow indicator. Options include internal visual element or check valve arrangement.

What is specified in the order?
Size, connection BW or ANSI flange, body material, indication type, pressure, temperature, fluid, and special construction requirement.