行业组件数据 · 2026

碟形封头

Dished ends are curved pressure vessel closures designed to withstand internal pressure in evaporators and other industrial equipment.

技术定义与适配语境
典型 碟形封头 会按材料、尺寸公差、适配关系和失效风险在 机械和设备制造 中评估。

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.

组件规格

定义
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.
工作原理
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.
材料
Typically made from carbon steel (e.g.SA-516 Gr. 70)stainless steel (e.g.304/316L for corrosion resistance)duplex steelsor nickel alloysdepending on temperaturepressureand corrosive media. Materials must comply with ASME Boiler and Pressure Vessel Code Section II. Thickness ranges from 3 mm to 50 mmbased on design pressure and diameter.
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)
标准
ISO 9095DIN 28011ASME Section VIII Div. 1EN 13445

行业分类与别名

碟形封头 的常用贸易名称、技术标识和检索关键词。

上级产品

该组件会出现在以下整机或工业产品中。

FMEA · 风险与缓解

诱因 → 失效模式 → 工程缓解

Cyclic pressure loading->Fatigue cracking at knuckle->Use elliptical heads with larger knuckle radii, implement regular non-destructive testing (NDT) like ultrasonic inspection.
Corrosive process fluids->Pitting or uniform corrosion->Select corrosion-resistant materials (e.g., 316L stainless steel), apply protective coatings, and monitor fluid chemistry.

工业生态与工程逻辑

0
Stress corrosion cracking
1
Fatigue failure at knuckle region
2
Improper welding leading to leaks
3
Material degradation from high temperatures

合规与检测

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

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采购评估维度

不是客户评论,也不是实时热度。以下维度用于前期 RFQ 准备和供应商评估。

技术文档
4/5
制造能力
4/5
可检验性
5/5
供应商透明度
3/5

这些分值是采购评估维度示例,不代表真实客户评分、具体国家买家反馈或实时询盘。

相关组件

常见问题

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.

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