Editorial Technical Reference

Inlet Manifold/Header

This page explains how Inlet Manifold/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 that collects and distributes gas from a single source to multiple outlets within a gas distribution system.

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Inlet Manifold/Header in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Inlet Manifold/Header

Definition
The inlet manifold or header is a critical component in gas distribution systems that serves as the primary collection and distribution point. It receives gas from a single inlet source and evenly distributes it to multiple downstream branches, pipes, or equipment. This ensures balanced flow and pressure distribution throughout the system, preventing uneven supply that could affect operational efficiency or safety. The manifold is typically constructed from stainless steel, carbon steel, or aluminum alloy, with body materials such as WCB, CF8, or CF8M per ASTM A216/A351. End connections may be flanged (RF), butt weld (BW), or socket weld (SW) per ASME B16.5/B16.25. Nominal diameters range from DN50 to DN300 (ISO 6708), with 2 to 8 outlets. Operating pressure is 1.0–1.6 MPa, and test pressure is 1.5–2.4 MPa. Operating temperature ranges from -40°C to 85°C. Flow coefficient (Cv) is 15–60, and leakage rate is ≤0.1% (Class A seat leakage). Weight varies from 15 to 120 kg depending on size and material. Surface treatments include epoxy or PTFE for corrosion protection. These values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier. The manifold's internal geometry is designed to minimize turbulence and pressure drops, ensuring consistent pressure and flow across all outlets. Proper selection requires consideration of pipe size, number of outlets, operating conditions, and material compatibility. Verification questions include confirming pressure ratings, temperature limits, and end connection standards. Maintenance signals include leakage, pressure drops, or corrosion. Failure boundaries include exceeding pressure or temperature limits, or improper installation.
Working Principle
Gas enters through a single inlet port into a common chamber or pipe section. The internal geometry of the manifold/header is designed to minimize turbulence and pressure drops while allowing the gas to flow smoothly to multiple outlet ports. The distribution is typically engineered to maintain consistent pressure and flow rates across all outlets, often through equal-length branches or carefully calculated internal diameters.
Common Materials
Stainless Steel, Carbon Steel, Aluminum Alloy
Technical Parameters
ParameterTypical rangeNotes & selection driver
Nominal DiameterDN50–DN300 mmMatches pipe size for flow capacity.ISO 6708
Number of Outlets2–8Determines distribution branches.
Test Pressure1.5–2.4 MPaHydrostatic test per standard.
Operating Temperature-40–85 °CSeal material limits range.
Flow Coefficient (Cv)15–60 CvIndicates flow capacity at given pressure drop.
Leakage Rate≤0.1 %Class A seat leakage.
Body MaterialWCB/CF8/CF8MCarbon steel or stainless steel.ASTM A216/A351
End ConnectionsRF/BW/SWFlanged, butt weld, or socket weld.ASME B16.5/B16.25
Weight15–120 kgDepends on size and material.
Surface TreatmentEpoxy/PTFECorrosion protection.

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
  • Inlet Flange Part
    Provides secure connection to the gas supply source
    Material: Steel
  • Main Chamber/Body Part
    Houses the gas for distribution to multiple outlets
    Material: Stainless Steel
  • Outlet Ports Part
    Individual connections for distributing gas to downstream components
    Material: Steel
  • Mounting Brackets Part
    Secures the manifold to the supporting structure
    Material: Steel
  • Pressure Relief Valve Port Optional Part
    Optional connection for safety pressure relief devices
    Material: Steel

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 150 psi (10.3 bar)
flow rate: 0-5000 SCFM (standard cubic feet per minute)
temperature: -40°C to 200°C
slurry concentration: Not recommended for slurry applications
Media Compatibility
✓ Natural Gas ✓ Compressed Air ✓ Inert Gases (e.g., Nitrogen, Argon)
Unsuitable: Corrosive or abrasive media (e.g., chlorine gas, sand-laden air)
Sizing Data Required
  • Required Flow Rate (SCFM)
  • Number of Outlet Ports
  • System Operating Pressure (psi)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal fatigue cracking
Cause: Cyclic thermal stresses from temperature fluctuations during operation, exacerbated by material embrittlement or poor design of stress concentration points.
Corrosion-induced leakage
Cause: Exposure to corrosive fluids or gases, inadequate material selection for the operating environment, or compromised protective coatings.
Maintenance Indicators
  • Visible cracks or discoloration on the manifold surface indicating overheating or material degradation
  • Audible hissing or whistling sounds suggesting gas or fluid leakage at connection points
Engineering Tips
  • Implement regular thermal imaging inspections to detect hot spots and uneven temperature distribution before cracks develop
  • Use corrosion-resistant alloys or apply protective linings suitable for the specific fluid chemistry, and ensure proper sealing at all joints with appropriate gasket materials

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
ASTM A370-21 (Standard Test Methods and Definitions for Mechanical Testing of Steel Products) DIN EN 10204:2004 (Metallic Products - Types of Inspection Documents)

Quoted from the published standard.

Manufacturing Precision
  • Bore Diameter: +/-0.05mm
  • Flange Flatness: 0.15mm per 300mm length
Quality Inspection
  • Pressure Leak Test (Hydrostatic/Pneumatic)
  • Dimensional Verification with CMM (Coordinate Measuring Machine)
Technical documentation
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Manufacturing capability
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Inspection readiness
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Supplier transparency
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Manufacturers of Inlet Manifold/Header

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Frequently Asked Questions

What is the function of an inlet manifold/header?

It collects gas from a single inlet and distributes it evenly to multiple outlets, ensuring balanced flow and pressure in a gas distribution system.

What materials are commonly used?

Stainless steel, carbon steel, and aluminum alloy are typical. Body materials may include WCB, CF8, or CF8M per ASTM A216/A351.

What standards apply to this component?

Relevant standards include ISO 6708 for nominal diameter, and leakage testing, ASME B16.5/B16.25 for end connections, and ASTM A216/A351 for body materials.

How should I verify the suitability of a specific manifold?

Check the manufacturer's datasheet for exact pressure, temperature, flow, and material ratings. Confirm that the end connections and dimensions match your system requirements.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Applied To / Applications

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

Gas Distribution System
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems

Data Basis

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

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.

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 · Page last updated 12 October 2026

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