Discharge Nozzle (Flange): Component Specs, Materials & Applications

Component Specifications

Definition

A discharge nozzle is a critical fluid-handling component featuring a flanged connection designed for secure attachment to volute casings in centrifugal pumps and similar machinery. It directs and regulates the flow of liquids or gases from the pump's volute casing into downstream piping systems, ensuring proper pressure management and minimizing turbulence. The flange provides a standardized, bolted interface for leak-proof sealing and easy maintenance access.

Working Principle

The discharge nozzle operates by channeling fluid from the high-pressure zone of the volute casing through a precisely shaped outlet. The flange connection ensures a rigid, sealed joint with piping, maintaining system integrity under operational pressures and vibrations while allowing controlled flow expansion or redirection as required by the application.

Materials

Typically ASTM A216 WCB carbon steel, ASTM A351 CF8/CF8M stainless steel, ductile iron (ASTM A536), or specialized alloys for corrosive/abrasive services. Flange faces machined to Ra 3.2-6.3 μm for gasket sealing.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Face Type	Raised face (RF) or flat face (FF)
Size Range	DN25 to DN600 (1" to 24")
Bolt Pattern	ASME B16.5 or DIN 2501 compliant
Connection Type	Flanged (ANSI/ASME B16.5, EN 1092-1)
Pressure Rating	PN10-PN40, Class 150-300

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, EN 1092-1

Parent Products

This component is used in the following industrial products

Volute Casing

The spiral-shaped housing of a centrifugal pump that converts kinetic energy from the impeller into pressure energy.

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Engineering Analysis

Risks & Mitigation

Leakage at flange joints due to improper gasket installation or bolt torque
Erosion/corrosion from aggressive fluids reducing service life
Misalignment causing stress on piping and pump casing
Pressure surges exceeding flange rating leading to failure

FMEA Triads

Trigger: Incorrect bolt tightening sequence or torque
Failure: Flange leakage and fluid loss
Mitigation: Follow ASME PCC-1 bolting procedures and use calibrated torque wrenches

Trigger: Material incompatibility with process fluid
Failure: Corrosion or erosion leading to nozzle wall thinning
Mitigation: Select materials based on corrosion charts and fluid analysis

Trigger: Thermal expansion mismatch between nozzle and piping
Failure: Flange distortion or cracking
Mitigation: Include expansion joints or flexible connectors in system design

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Flange face flatness within 0.8 mm per ASME B16.5, nozzle bore diameter ±0.5% of nominal size

Test Method

Hydrostatic pressure testing per ISO 5208, helium leak testing for critical services, dimensional verification per engineering drawings

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.

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Manufacturers of Discharge Nozzle (Flange)

Manufacturer profiles associated with Discharge Nozzle (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 a discharge nozzle in a volute casing?

It provides a controlled exit point for fluid from the volute casing, directing flow into piping systems while maintaining pressure and minimizing energy losses.

How do I select the correct flange standard for a discharge nozzle?

Match the flange standard (e.g., ANSI, DIN, EN) to your existing piping system, considering pressure rating, material compatibility, and regional regulations.

Can discharge nozzles be customized for specific applications?

Yes, they can be customized in material, size, flange type, and internal geometry to handle corrosive fluids, high temperatures, or abrasive slurries.

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.

Discharge Nozzle (Flange)