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Dished Ends Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

Dished ends, also known as dished heads or end caps, are hemispherical or elliptical components that form the closure at the ends of cylindrical pressure vessels like evaporator bodies. They are engineered to distribute stress evenly under internal pressure, preventing flat surfaces that would require excessive thickness. Common types include torispherical (with a knuckle radius), elliptical (2:1 ratio), and hemispherical designs, each offering different strength-to-weight ratios and manufacturing complexities. They are critical for maintaining vessel integrity, facilitating cleaning, and allowing for nozzle attachments.

Working Principle

Dished ends work by converting internal pressure loads into tensile stresses distributed across their curved surface, following the principle that a curved structure is stronger than a flat plate under pressure. The curvature reduces stress concentrations, allowing thinner material usage while maintaining safety. In evaporators, they help contain steam or process fluids, with the shape promoting efficient fluid flow and minimizing dead zones. The knuckle region (in torispherical designs) transitions stress smoothly from the cylindrical shell to the crown.

Materials

Typically made from carbon steel (e.g., SA-516 Gr. 70), stainless steel (e.g., 304/316L for corrosion resistance), duplex steels, or nickel alloys, depending on temperature, pressure, and corrosive media. Materials must comply with ASME Boiler and Pressure Vessel Code Section II. Thickness ranges from 3 mm to 50 mm, based on design pressure and diameter.

Technical Parameters

Diameter 500 mm to 3000 mm
Thickness 6 mm to 30 mm (common range)
Crown Radius 0.8 to 1.0 times diameter
Knuckle Radius 6% to 10% of diameter
Surface Finish Ra ≤ 3.2 μm for hygienic applications
Pressure Rating Up to 30 bar (design dependent)

Standards

ISO 9095, DIN 28011, ASME Section VIII Div. 1, EN 13445

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Dished Ends.

Parent Products

This component is used in the following industrial products

Evaporator Body/Vessel

The main pressure vessel that contains the liquid to be concentrated under vacuum conditions in an evaporator system.

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Reactor Shell/Vessel

The primary pressure-containing structure of an ammonia oxidation reactor that houses the catalyst bed and reaction zone.

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Engineering Analysis

Risks & Mitigation

Stress corrosion cracking
Fatigue failure at knuckle region
Improper welding leading to leaks
Material degradation from high temperatures

FMEA Triads

Trigger: Cyclic pressure loading
Failure: Fatigue cracking at knuckle
Mitigation: Use elliptical heads with larger knuckle radii, implement regular non-destructive testing (NDT) like ultrasonic inspection.

Trigger: Corrosive process fluids
Failure: Pitting or uniform corrosion
Mitigation: Select corrosion-resistant materials (e.g., 316L stainless steel), apply protective coatings, and monitor fluid chemistry.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Diameter tolerance ±0.5%, thickness tolerance ±10% per ASME standards

Test Method

Hydrostatic testing at 1.5 times design pressure, radiographic welding inspection, dye penetrant testing for cracks

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What are the main types of dished ends used in evaporators?

The most common types are torispherical (for cost-effectiveness), elliptical (2:1 ratio for balanced strength), and hemispherical (for high-pressure applications). Selection depends on pressure, cost, and space constraints.

How do dished ends affect evaporator efficiency?

They minimize stress concentrations, allowing thinner walls and better heat transfer. Their smooth curvature reduces fluid turbulence and scaling, improving thermal performance and cleanability.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

Dished Ends