Inlet Connection Flange: Nominal Diameter DN50 to DN200

Component Specifications

Definition

The Inlet Connection Flange is a precision-machined circular component with bolt holes and a sealing surface, serving as the interface between the inlet pipe and the Upper Distributor's main body. It facilitates the controlled entry of fluids (liquids or gases) into the distribution system while maintaining pressure integrity and preventing leaks through gasket compression.

Working Principle

Operates by creating a bolted, gasket-sealed joint between the inlet pipe and the Upper Distributor housing. When bolts are tightened, the flange compresses a gasket against mating surfaces, forming a pressure-tight seal that allows fluid to flow into the distributor while withstanding system pressures and preventing external contamination.

Materials

Typically ASTM A105 carbon steel, 304/316 stainless steel, or ductile iron; includes specifications for hardness (e.g., HB 187 max for steel), corrosion resistance, and machinability per ASTM/ASME standards.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Face Type	Raised face (RF)
Thickness	12-25 mm depending on size
Surface Finish	125-250 µin Ra for sealing
Pressure Rating	PN16/PN25 (150/300 psi)
Nominal Diameter	DN50 to DN200
Bolt Circle Diameter	As per ASME B16.5

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 7005-1, ASME B16.5, DIN 2501

Parent Products

This component is used in the following industrial products

Upper Distributor

A component within a vessel or container that evenly distributes materials, fluids, or gases entering from the top.

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Engineering Analysis

Risks & Mitigation

Gasket failure leading to leaks
Bolt loosening under vibration
Corrosion in aggressive environments
Misalignment causing seal damage

FMEA Triads

Trigger: Improper bolt torque
Failure: Flange leak under pressure
Mitigation: Use calibrated torque wrenches and follow tightening sequences per ASME PCC-1

Trigger: Corrosive fluid exposure
Failure: Material degradation and pitting
Mitigation: Select corrosion-resistant materials (e.g., 316 stainless steel) and apply protective coatings if needed

Trigger: Thermal cycling
Failure: Gasket compression loss and leakage
Mitigation: Use spiral-wound gaskets and schedule retorquing after temperature changes

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.8 mm on bolt hole diameter, ±1° on bolt circle angularity per ASME B16.5

Test Method

Hydrostatic pressure testing at 1.5x rated pressure for 30 minutes, with visual inspection and leak detection using soap solution or ultrasonic methods.

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 Inlet Connection Flange

Manufacturer profiles associated with Inlet Connection Flange.

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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

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Frequently Asked Questions

What is the primary function of an Inlet Connection Flange?

To provide a secure, leak-proof connection between the inlet pipe and the Upper Distributor, enabling controlled fluid entry while maintaining system pressure integrity.

How do I select the correct flange material?

Choose based on fluid compatibility, pressure/temperature conditions, and corrosion requirements—common options include carbon steel for general use, stainless steel for corrosive environments, and ductile iron for cost-effective applications.

What maintenance does this flange require?

Regular inspection for bolt tightness, gasket wear, and surface corrosion; replace gaskets during system shutdowns and ensure bolt retorquing as per manufacturer specifications.

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.

Inlet Connection Flange