Header Shell: Length Range 500-6000 mm

Component Specifications

Definition

A header shell is a cylindrical or rectangular structural component that encloses the tube sheet assembly in heat exchangers, boilers, condensers, and pressure vessels. It serves as the primary pressure boundary, containing the fluid medium while providing support for internal components like tubes, baffles, and partitions. The shell is designed to withstand operational pressures, thermal stresses, and mechanical loads while maintaining leak-tight integrity.

Working Principle

The header shell operates as a pressure vessel component that contains fluid under pressure or vacuum conditions. It distributes mechanical stresses evenly through its geometry, transfers thermal energy between internal and external environments, and provides mounting surfaces for nozzles, flanges, and support structures. The shell's design ensures proper fluid distribution across tube bundles while maintaining structural stability under cyclic loading.

Materials

Carbon steel (ASTM A516 Gr.70), Stainless steel (304/316L), Duplex stainless steel (2205), Nickel alloys (Inconel 625), Titanium (Grade 2), Aluminum alloys (6061-T6) with material thickness ranging from 6mm to 50mm depending on pressure rating.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length Range	500-6000 mm
Weld Quality	100% radiographic testing
Diameter Range	200-2000 mm
Surface Finish	Ra 3.2 μm minimum
Pressure Rating	150-3000 PSI
Temperature Range	-50°C to 450°C
Flatness Tolerance	±1.5 mm/m

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 16812, DIN EN 13445, ASME BPVC Section VIII

Parent Products

This component is used in the following industrial products

Tube Sheets/Headers

Structural components in economizers that secure heat exchanger tubes and distribute/collect working fluids.

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Engineering Analysis

Risks & Mitigation

Stress corrosion cracking
Thermal fatigue failure
Weld defect propagation
Creep deformation at high temperatures
Erosion-corrosion in aggressive media

FMEA Triads

Trigger: Inadequate material selection for corrosive service
Failure: Premature wall thinning and leakage
Mitigation: Implement corrosion allowance calculations and select appropriate corrosion-resistant alloys based on fluid analysis

Trigger: Improper welding procedures
Failure: Weld cracking under thermal cycling
Mitigation: Follow qualified welding procedures (WPS/PQR), perform post-weld heat treatment, and conduct NDT verification

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5% on diameter, ±1.0% on length, ±0.2° on nozzle alignment

Test Method

Hydrostatic pressure test per ASME BPVC Section VIII Div.1, PMI verification, dimensional inspection per ISO 2768-mK

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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CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Header Shell

Manufacturer profiles associated with Header Shell.

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Frequently Asked Questions

What is the difference between header shell and pressure vessel shell?

Header shells are specifically designed for tube sheet/header assemblies in heat exchangers, featuring precise nozzle alignments and internal baffle attachments, while general pressure vessel shells have broader applications with simpler internal configurations.

How are header shells tested for quality assurance?

Header shells undergo hydrostatic testing at 1.5x design pressure, radiographic weld examination, ultrasonic thickness testing, dimensional verification, and surface inspection per ASME and 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.

Header Shell