Nozzles/Flanges: Size Range DN15-DN600

Component Specifications

Definition

Nozzles are cylindrical extensions welded to vessel shells that provide openings for fluid transfer, instrumentation, or access. Flanges are flat, circular discs with bolt holes that connect nozzles to piping systems, creating sealed, pressure-tight joints. Together they form the primary interface between pressure vessels and external systems.

Working Principle

Nozzles provide controlled openings in pressure boundaries using reinforced construction to manage stress concentrations. Flanges create mechanical seals through bolted connections with gaskets, distributing clamping force evenly to prevent leaks under pressure and temperature variations.

Materials

Carbon steel (ASTM A105, A350), stainless steel (ASTM A182 F304/316), alloy steel (ASTM A182 F11/F22), with material selection based on pressure, temperature, and corrosion requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Face Type	RF, FF, RTJ
Standards	ASME B16.5, B16.47
Size Range	DN15-DN600
Pressure Rating	150-2500 PSI
Temperature Range	-50°C to 500°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

ASME BPVC Section VIII, ASME B16.5, ASME B16.47, ISO 7005-1, DIN 2632-2638

Parent Products

This component is used in the following industrial products

Vessel/Shell

The structural housing that contains and protects the desiccant material within a desiccant bed system.

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Engineering Analysis

Risks & Mitigation

Stress corrosion cracking at weld joints
Flange face damage during installation
Improper gasket selection causing leaks
Thermal fatigue at nozzle-to-shell connections
Bolt relaxation under thermal cycling

FMEA Triads

Trigger: Inadequate nozzle reinforcement design
Failure: Crack propagation from nozzle neck
Mitigation: Follow ASME reinforcement calculations and use full penetration welds with NDE

Trigger: Improper flange alignment during assembly
Failure: Gasket blowout under pressure
Mitigation: Use alignment pins and progressive bolt tightening sequence

Trigger: Corrosive fluid attack at weld HAZ
Failure: Localized corrosion leading to leaks
Mitigation: Select corrosion-resistant materials and apply post-weld heat treatment

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Flange face flatness within 0.8mm, bolt hole alignment within 1.6mm, nozzle perpendicularity within 1° of axis

Test Method

Hydrostatic testing per ASME BPVC, liquid penetrant testing of welds, dimensional verification with laser alignment

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

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Manufacturers of Nozzles/Flanges

Manufacturer profiles associated with Nozzles/Flanges.

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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 difference between a nozzle and a flange?

A nozzle is the welded attachment to the vessel shell that creates an opening, while a flange is the bolted connection component that mates with piping flanges. The nozzle provides structural integrity, while the flange provides the sealing surface.

How are nozzles reinforced on pressure vessels?

Nozzles are reinforced using pad plates, thicker shell sections, or integrally forged designs to compensate for material removed from the pressure boundary and manage stress concentrations at the opening.

What gasket types are used with vessel flanges?

Spiral wound gaskets (SS with graphite/filler), ring joint gaskets (oval/octagonal), and flat gaskets (non-asbestos) are commonly used, selected based on pressure, temperature, and fluid compatibility.

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.

Nozzles/Flanges