Editorial Technical Reference

Distribution Header

This page explains how Distribution Header is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A component of an evaporator that evenly distributes the feed liquid or vapor to multiple tubes or channels.

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Product Specifications

Technical details and manufacturing context for Distribution Header

Definition
The Distribution Header is a critical part of an evaporator system, typically located at the inlet section. Its primary function is to receive the incoming fluid (liquid or vapor) and ensure its uniform distribution across the multiple parallel tubes, plates, or channels within the evaporator's heat exchange section. This uniform flow is essential for maximizing heat transfer efficiency, preventing dry spots, scaling, or uneven concentration, and ensuring consistent product quality and process stability. The header is designed to handle a range of operating conditions, with design pressures from 1.0 to 1.6 MPa and design temperatures from -40°C to 200°C (per EN 13445). Nominal diameters range from 50 to 600 mm (ISO 7005), and the number of outlets can vary from 2 to 48, with outlet spacing between 50 and 300 mm. Flow rates typically range from 5 to 500 m³/h, based on inlet velocities of 0.5–2 m/s. Pressure drop is kept low, between 0.01 and 0.1 MPa, to improve efficiency. Materials commonly used include stainless steel (304, 316L), carbon steel, duplex stainless steel, and nickel alloys. Wall thickness ranges from 3 to 12 mm (ASME B36.10), and surface roughness can be specified from 0.8 to 3.2 µm (ISO 1302) for applications requiring smooth finishes, such as food or pharmaceutical processing. Connection types are typically flanged (ISO 7005), and the weight of the header varies from 10 to 500 kg depending on size and material. These values are reference ranges; actual specifications must be confirmed with the manufacturer for specific applications. The header's internal geometry is engineered to reduce flow velocity and turbulence, allowing the fluid to stabilize and equalize pressure before distribution. This ensures each parallel flow path receives an approximately equal share of the total feed, promoting balanced thermal and mass transfer performance across the entire evaporator surface. Proper selection of the header involves considering process conditions, fluid properties, and system layout. Verification of design parameters and compliance with relevant standards should be done with the legal manufacturer or supplier.
Working Principle
Fluid enters the header through a single inlet. The internal geometry, such as a large-diameter pipe, a manifold with baffles, or a specially designed chamber, reduces flow velocity and turbulence, allowing the fluid to stabilize. Pressure is equalized within the header before the fluid exits through multiple outlet ports, each connected to an individual tube or channel. This design ensures each parallel flow path receives an approximately equal share of the total feed, promoting balanced thermal and mass transfer performance across the entire evaporator surface.
Common Materials
Stainless Steel (e.g., 304, 316L), Carbon Steel, Duplex Stainless Steel, Nickel Alloys
Technical Parameters
ParameterTypical rangeNotes & selection driver
Design Temperature-40–200 °CAbove 200°C material strength decreasesEN 13445
Nominal Diameter50–600 mmCustom sizes availableISO 7005
Number of Outlets2–48 pcsDetermines distribution capacity
Outlet Spacing50–300 mmUniform spacing ensures even distribution
Flow Rate5–500 m³/hBased on inlet velocity 0.5–2 m/s
Pressure Drop0.01–0.1 MPaLower drop improves efficiency
Material Grade304/316L316L for corrosive mediaASTM A240
Wall Thickness3–12 mmPressure rating determines thicknessASME B36.10
Surface Roughness0.8–3.2 µmSmoother for food/pharmaISO 1302
Weight10–500 kgDepends on size and material
Connection TypeFlangedOther types availableISO 7005

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Header Body/Shell Part
    The main pressure vessel that contains and distributes the fluid.
    Material: Stainless Steel
  • Inlet Nozzle/Flange Part
    Connection point for the main feed pipe.
    Material: Stainless Steel
  • Outlet Nozzles/Tube Stubs Part
    Multiple connection points for individual evaporator tubes or channels.
    Material: Stainless Steel
  • Internal Baffles/Diffusers Optional Part
    Optional components to guide flow and improve distribution uniformity.
    Material: Stainless Steel
  • Support Brackets Part
    Secures the header to the evaporator structure.
    Material: Carbon Steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Evaporator
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Evaporator / Process Heat Exchanger
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Liquid Distribution System
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Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 bar (150 psi)
flow rate: 0.5 to 50 m³/h
temperature: -40°C to 200°C
slurry concentration: Up to 30% solids by weight
Media Compatibility
✓ Water/glycol mixtures ✓ Refrigerants (R134a, R410A) ✓ Food-grade liquids (milk, juice)
Unsuitable: Highly corrosive acids (e.g., concentrated sulfuric acid)
Sizing Data Required
  • Total system flow rate (m³/h)
  • Number of tubes/channels to feed
  • Required pressure drop across header (bar)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Corrosion-induced wall thinning
Cause: Exposure to corrosive process fluids (e.g., acids, chlorides) or atmospheric conditions without adequate protective coatings or material selection, leading to material degradation and reduced structural integrity.
Fatigue cracking at welded joints or branch connections
Cause: Cyclic thermal expansion/contraction or pressure fluctuations causing stress concentration at weld seams, leading to crack initiation and propagation over time.
Maintenance Indicators
  • Visible external corrosion, pitting, or weeping at seams and connections indicating material loss
  • Audible hammering or vibration noises suggesting water hammer, flow-induced vibration, or internal component failure
Engineering Tips
  • Implement regular ultrasonic thickness testing at high-risk areas (welds, bends, supports) to monitor wall thinning and schedule proactive replacement before failure
  • Install expansion loops or flexible connectors to absorb thermal movement and reduce stress on fixed connections, and ensure proper support spacing to prevent sagging and vibration

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASME B31.3 - Process Piping PED 2014/68/EU - Pressure Equipment Directive

Quoted from the published standard.

Manufacturing Precision
  • Bore Diameter: +/-0.05mm
  • Flange Flatness: 0.1mm per 100mm diameter
Quality Inspection
  • Hydrostatic Pressure Test
  • Ultrasonic Thickness Testing

Manufacturers of Distribution Header

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Jiangsu Prettech Machinery & Technology Co., Ltd.
Jiangsu, CN
Also makes: Steam Distribution Header, Heat Exchanger, Mixing Tank
Listed on the company's own website · profile compiled by CNFX from public sources
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Frequently Asked Questions

What is the primary function of a distribution header in an evaporator?

The primary function is to receive the incoming feed liquid or vapor and distribute it uniformly across multiple tubes or channels, ensuring even flow and heat transfer.

What materials are commonly used for distribution headers?

Common materials include stainless steel (304, 316L), carbon steel, duplex stainless steel, and nickel alloys, depending on the application and corrosion requirements.

What design parameters should be considered when selecting a distribution header?

Key parameters include design pressure, temperature, nominal diameter, number of outlets, outlet spacing, flow rate, pressure drop, material grade, wall thickness, surface roughness, and connection type.

How can I ensure the distribution header meets my process requirements?

You should verify all model-specific values and standards with the legal manufacturer or supplier, as the listed parameters are reference ranges and must be confirmed for your specific application.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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