Editorial Technical Reference

Flange Housing

This page explains how Flange Housing is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

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

View Full Specifications Explore Manufacturing Sources
Flange Housing in a manufacturing environment
Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Flange Housing

Definition
The flange housing is a critical component of sight glass assemblies that serves as the mounting structure and sealing interface between the sight glass and the equipment vessel or pipeline. It provides a secure, leak-proof connection while allowing visual inspection of process fluids or materials. This part is typically manufactured from stainless steel 316, carbon steel, or alloy steel, with material grade options such as 304 or 316L for corrosive media. The housing is designed to accommodate nominal sizes from DN15 to DN100 per ISO 6708, and it operates within a pressure range of 1.0 to 1.6 MPa, and a temperature range of -20°C to 200°C. Key parameters include flange face flatness of 0.05 mm per ISO 4759-1, bolt hole diameter tolerance of +0.3/0 mm per ISO 273, and surface roughness of Ra 3.2–6.3 μm on the sealing face per ISO 1302. The housing weight varies from 0.5 to 5.0 kg depending on size and material. It offers ingress protection ratings from IP54 to IP65 per IEC 60529, and corrosion resistance of at least 200 hours in salt spray testing per ASTM B117. These values are reference ranges for directory purposes; actual specifications must be confirmed with the legal manufacturer or supplier for the specific model and application. The flange housing ensures proper alignment and pressure resistance, maintaining a sealed chamber that holds the sight glass in position. It uses bolt holes or clamps to secure the assembly, with gaskets or seals between mating surfaces to prevent leakage. This component is essential for safe and reliable operation of sight glass assemblies in industrial machinery and equipment.
Working Principle
The flange housing creates a sealed chamber that holds the sight glass in position against the equipment opening. It uses bolt holes or clamps to secure the assembly, with gaskets or seals between mating surfaces to prevent leakage. The housing maintains proper alignment and pressure resistance while allowing light transmission through the sight glass. The sealing face is machined to a specified flatness and surface roughness to ensure uniform gasket compression and a reliable seal. The bolt hole diameter tolerance allows standard bolts to fit correctly, and the ingress protection rating indicates the level of protection against dust and water. The housing's material and design must withstand the operating pressure and temperature, and its corrosion resistance is verified through salt spray testing. Proper installation and maintenance are crucial to prevent leaks and ensure long-term performance.
Common Materials
Stainless Steel 316, Carbon Steel, Alloy Steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Nominal SizeDN15–DN100 mmMatches sight glass flange sizeISO 6708
Operating Temperature-20–200 °CAbove 200°C gasket may degrade
Flange Face Flatness0.05 mmEnsures uniform gasket compressionISO 4759-1
Bolt Hole Diameter Tolerance+0.3/0 mmAllows standard bolt fitISO 273
Surface Roughness (Sealing Face)Ra 3.2–6.3 μmSmoother for soft gasketsISO 1302
Material Grade304/316L316L for corrosive mediaASTM A240
Weight0.5–5.0 kgDepends on size and material
Corrosion Resistance (Salt Spray)≥200 hNo red rust after testASTM B117

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

Components / BOM
  • Housing Body
    The housing itself: encloses and locates the internal parts and provides the mounting interface.
  • Flange Face Part
    Provides sealing surface for gasket installation
    Material: Stainless Steel
  • Sight Glass Recess Part
    Holds and positions the sight glass element
    Material: Same as housing material

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 bar (150 psi)
other spec: Slurry concentration up to 40% solids by weight, Flow rate dependent on sight glass diameter
temperature: -40°C to 200°C
Media Compatibility
✓ Water-based fluids ✓ Petroleum-based oils ✓ Chemical process media (pH 4-10)
Unsuitable: Hydrofluoric acid or highly caustic environments (pH <2 or >12)
Sizing Data Required
  • Sight glass diameter and thickness
  • Flange bolt circle diameter and bolt size
  • Required sealing pressure and gasket type

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Bolt fatigue and loosening
Cause: Cyclic thermal expansion/contraction or vibration leading to loss of preload, gasket compression, and eventual leakage or joint separation
Flange face corrosion or pitting
Cause: Exposure to corrosive fluids, moisture, or chemical attack, compromising the sealing surface and leading to leaks
Maintenance Indicators
  • Visible fluid seepage or drips around the flange joint
  • Abnormal noise (hissing, whistling) indicating gas or high-pressure fluid leakage
Engineering Tips
  • Implement a torque audit and re-torquing schedule using calibrated tools and proper bolt tightening sequences to maintain gasket compression
  • Apply protective coatings or use corrosion-resistant flange materials compatible with the service environment, and ensure proper gasket selection for chemical resistance

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 7005-1:2011 (Metallic flanges) ASME B16.5:2020 (Pipe flanges and flanged fittings) DIN EN 1092-1:2018 (Flanges and their joints)

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.05 mm
  • Flange face flatness: 0.1 mm per 300 mm diameter
Quality Inspection
  • Dye Penetrant Test (PT) for surface defects
  • Dimensional verification with CMM (Coordinate Measuring Machine)
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.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Flange Housing

Manufacturer profiles associated with Flange Housing.

Sourcing Flange Housing from China?
Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.
Request manufacturers We manufacture this

Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.

Buyer enquiry

Request manufacturing insight for Flange Housing

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes
Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here
We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman
CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What to include
Share your product specifications, quantity, destination and target delivery date.

Your business information is used only to process this request.

Thank you! Your message has been sent. We'll respond within 1–3 business days.
Sorry, we couldn't send your message. Please try again, or email us at [email protected].

Frequently Asked Questions

What materials are available for the flange housing?

The flange housing can be made from stainless steel 316, carbon steel, or alloy steel. Material grade options include 304 or 316L for corrosive media, as listed in the directory. Always confirm the exact material grade with the supplier for your application.

What are the operating pressure and temperature limits?

The directory lists an operating pressure range of 1.0 to 1.6 MPa, and a temperature range of -20°C to 200°C. These are reference values; the actual limits depend on the specific model and must be verified with the manufacturer.

How is the sealing performance ensured?

The sealing performance is ensured by the flange face flatness (0.05 mm per ISO 4759-1) and surface roughness (Ra 3.2–6.3 μm per ISO 1302) on the sealing face. These specifications help achieve uniform gasket compression and a leak-proof connection. Proper installation and gasket selection are also critical.

What ingress protection ratings are available?

The flange housing offers ingress protection ratings from IP54 to IP65 per IEC 60529. IP65 is suitable for washdown environments. The required rating depends on the installation environment and should be confirmed with the supplier.

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

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Sight Glass Assembly
View system integration details

Industrial Ecosystem & Supply Chain Structure

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

Need to Manufacture Flange Housing?

Compare manufacturer profiles with relevant product and process capability.

Create Manufacturer Profile Contact Us
Previous Product
Z-axis Ram/Spindle
Last Product
Get QuotesChat