End Cap / Head: Diameter 500-5000 mm, Thickness 10-100 mm

Component Specifications

Definition

An end cap or head is a structural component used to close the ends of pressure vessels, tanks, and piping systems. It withstands internal pressure, prevents leakage, and maintains vessel integrity under operational conditions. Heads come in various geometric shapes (hemispherical, elliptical, torispherical, flat) designed to distribute stress efficiently and meet specific pressure, temperature, and media requirements.

Working Principle

The end cap functions by transferring internal pressure loads through its curved geometry to the vessel shell, minimizing stress concentrations. It creates a sealed boundary that contains fluids or gases under pressure while allowing for connections, inspections, and maintenance through integrated nozzles or manways. The shape determines pressure distribution—hemispherical heads provide optimal stress distribution, while elliptical heads offer a balance of strength and manufacturing efficiency.

Materials

Carbon steel (SA-516 Gr.70), stainless steel (SA-240 Type 316), alloy steels (SA-387 Gr.11), aluminum alloys, nickel alloys. Material selection depends on pressure rating, temperature, corrosion resistance, and media compatibility.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	500-5000 mm
Thickness	10-100 mm
Surface Finish	Ra ≤ 3.2 μm
Pressure Rating	10-100 bar
Design Temperature	-50°C to 400°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

ISO 16528, ASME BPVC Section VIII, DIN 28011, EN 13445

Parent Products

This component is used in the following industrial products

Pressure Vessels

A sealed container designed to hold fluids at a pressure substantially different from the ambient pressure, serving as the core housing for reverse osmosis membrane elements.

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Engineering Analysis

Risks & Mitigation

Stress corrosion cracking
Fatigue failure at weld joints
Improper material selection leading to brittle fracture
Leakage due to gasket failure

FMEA Triads

Trigger: Corrosive media exposure
Failure: Pitting and wall thinning
Mitigation: Use corrosion-resistant alloys and protective coatings

Trigger: Cyclic pressure loading
Failure: Fatigue cracks at head-to-shell junction
Mitigation: Design with smooth transitions and perform regular NDE inspections

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±2 mm on diameter, ±0.5 mm on thickness per ISO 16528

Test Method

Hydrostatic test at 1.3x design pressure, visual inspection, ultrasonic thickness measurement

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 End Cap / Head

Manufacturer profiles associated with End Cap / Head.

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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 are the main types of pressure vessel heads?

Common types include hemispherical (best stress distribution), elliptical (standard for medium pressure), torispherical (cost-effective), and flat heads (for low pressure).

How are end caps tested for safety?

Testing includes hydrostatic pressure tests, non-destructive examination (NDE) like ultrasonic testing, radiographic inspection, and material certification per ASME/ISO standards.

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.

End Cap / Head