Sight Glass Recess: Temperature Range -20°C to 200°C

Component Specifications

Definition

A precisely machined recess in a flange housing assembly that accommodates a sight glass, allowing operators to visually inspect fluid levels, flow conditions, color changes, or contamination within pipelines, tanks, or processing equipment without interrupting system operation.

Working Principle

Provides a transparent viewing port through the housing wall by creating a sealed cavity where a glass or polymer disc is installed, typically using gaskets and compression fittings to maintain pressure integrity while enabling optical access to internal fluids.

Materials

Carbon steel (ASTM A36), stainless steel (304/316L), aluminum alloys (6061-T6), or engineered plastics (PTFE, PVDF) depending on chemical compatibility and pressure requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Depth	10-40 mm
Diameter	25-150 mm
Surface Finish	Ra 3.2 μm or better
Pressure Rating	Up to 150 psi
Temperature Range	-20°C to 200°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9624, DIN 11851, ASME B16.5

Parent Products

This component is used in the following industrial products

Flange Housing

A structural component that provides mounting and sealing interface for sight glass assemblies in industrial equipment.

View Product Details

Engineering Analysis

Risks & Mitigation

Glass breakage under pressure
Gasket failure leading to leaks
Fogging or contamination obscuring view
Chemical degradation of materials

FMEA Triads

Trigger: Improper gasket installation
Failure: Fluid leakage
Mitigation: Use torque wrenches and follow installation specifications

Trigger: Thermal expansion mismatch
Failure: Cracked sight glass
Mitigation: Select materials with compatible thermal coefficients

Trigger: Chemical corrosion
Failure: Material degradation
Mitigation: Use chemically resistant materials like 316L stainless or PTFE

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm on diameter and depth, perpendicularity within 0.05 mm

Test Method

Pressure testing per ISO 15848, visual inspection per ASTM A380

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Sight Glass Recess

Manufacturer profiles associated with Sight Glass Recess.

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Frequently Asked Questions

What is the purpose of a sight glass recess?

It provides a secure mounting location for sight glasses to allow visual monitoring of fluid conditions without compromising system integrity.

Can sight glass recesses be retrofitted to existing flange housings?

Yes, but requires precision machining and pressure testing to ensure seal integrity and compliance with standards.

How do you clean and maintain sight glass recesses?

Regular inspection for cracks, gasket replacement, and cleaning with compatible solvents to maintain visibility and prevent contamination.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Sight Glass Recess