Industry-Verified Manufacturing Data (2026)

Weir

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Weir used in the Chemical Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Weir is characterized by the integration of Weir Plate and Mounting Brackets. In industrial production environments, manufacturers listed on CNFX commonly emphasize Stainless Steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A raised barrier on distillation trays that controls liquid flow and maintains liquid level.

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Product Specifications

Technical details and manufacturing context for Weir

Definition
A weir is a critical component of distillation trays and packing systems that creates a liquid seal by maintaining a specific liquid height on the tray. It regulates liquid flow across the tray, ensures proper vapor-liquid contact, and prevents liquid from bypassing the active area. Weirs come in various configurations including outlet weirs, inlet weirs, and intermediate weirs, each serving specific flow control functions within the distillation column.
Working Principle
The weir creates a hydraulic barrier that maintains a minimum liquid level on the distillation tray. As liquid flows across the tray, it accumulates behind the weir until it reaches the weir height, then spills over to the next section. This controlled overflow ensures uniform liquid distribution, proper residence time for mass transfer, and prevents dry spots on the tray surface.
Common Materials
Stainless Steel, Carbon Steel, Alloy Steel
Technical Parameters
  • Weir height typically ranges from 25-100mm depending on tray design and operating conditions (mm) Standard Spec
Components / BOM
  • Weir Plate
    Main structural element that forms the barrier
    Material: steel
  • Mounting Brackets
    Secures the weir to the tray deck
    Material: steel
  • Sealing Gasket
    Prevents leakage between weir and tray deck
    Material: elastomer
Engineering Reasoning
Liquid height 25-75 mm above weir crest, flow rate 0.5-3.0 m³/h per meter of weir length
Liquid height exceeds 100 mm (weir overtopping) or drops below 10 mm (dry weir condition)
Design Rationale: Hydraulic jump instability at Froude number >0.7 causes liquid entrainment and maldistribution; surface tension effects dominate at Bond number <0.1 leading to improper liquid flow
Risk Mitigation (FMEA)
Trigger Corrosion rate exceeding 0.5 mm/year due to chloride concentration >50 ppm in process fluid
Mode: Weir crest erosion reducing effective height by >15%, causing liquid bypass and tray flooding
Strategy: Apply 316L stainless steel cladding with 3 mm minimum thickness and cathodic protection at -0.85 V vs Ag/AgCl reference
Trigger Thermal expansion mismatch of 0.3 mm/m·K between weir material (carbon steel) and tray deck (stainless steel)
Mode: Weir detachment from tray deck at weld joints during temperature cycles between 50-200°C
Strategy: Install expansion joints with Inconel 625 bellows rated for 10,000 cycles at 150°C differential

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Weir.

stainless steel distillation tray weir chemical manufacturing weir plate carbon steel weir for distillation alloy steel liquid flow control weir distillation tray weir mounting brackets

Applied To / Applications

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

Distillation Trays/Packing
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Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 bar (typical), higher with reinforced design
flow rate: 0.5-50 m³/h per meter weir length
temperature: -50°C to 400°C (dependent on tray material)
slurry concentration: Up to 30% solids by weight (non-abrasive)
Media Compatibility
✓ Hydrocarbon distillation ✓ Water/steam systems ✓ Chemical processing (acids/bases)
Unsuitable: Highly abrasive slurry with >40% solids
Sizing Data Required
  • Liquid flow rate (m³/h)
  • Tray diameter (m)
  • Required liquid height (m)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Abrasive erosion
Cause: Suspended solids in the fluid (sand, silt, mineral particles) impinging on and gradually wearing away the weir crest, gate surfaces, or downstream apron, particularly at high flow velocities.
Structural fatigue cracking
Cause: Cyclic hydraulic loading from fluctuating water levels, wave action, or debris impacts leading to stress concentration and crack initiation, often at welds, bolt holes, or changes in section geometry.
Maintenance Indicators
  • Visible, progressive deformation or sagging of the weir crest or structural members, indicating loss of integrity.
  • Unusual or increasing leakage/seepage around or under the weir structure, or audible rushing water sounds suggesting undermining or internal erosion.
Engineering Tips
  • Install durable, abrasion-resistant linings (e.g., hardened steel plates, polyurethane, or high-density polyethylene) on high-wear surfaces like the crest and downstream apron to combat erosion.
  • Implement a regular inspection and debris management program to prevent accumulation of logs, vegetation, or sediment that can increase hydraulic loads, cause local scour, or obstruct flow, thereby reducing structural stress and localized erosion.

Compliance & Manufacturing Standards

Reference Standards
ISO 14313:2009 (Petroleum and natural gas industries - Pipeline transportation systems - Pipeline valves) ANSI/API 6D:2022 (Pipeline Valves) EN 1074-2:2000 (Valves for water supply - Fitness for purpose requirements and appropriate verification tests - Part 2: Isolating valves)
Manufacturing Precision
  • Bore diameter: +/-0.5% of nominal diameter
  • Surface flatness of mating flanges: 0.1 mm per 100 mm diameter
Quality Inspection
  • Hydrostatic pressure test (to verify leak-tightness under operating conditions)
  • Dimensional verification (using coordinate measuring machine for critical dimensions)

Factories Producing Weir

Verified manufacturers with capability to produce this product in China

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✓ 92% Supplier Capability Match Found

P Project Engineer from United States Jan 17, 2026
★★★★★
"The technical documentation for this Weir is very thorough, especially regarding technical reliability."
Technical Specifications Verified
S Sourcing Manager from United Arab Emirates Jan 14, 2026
★★★★★
"Reliable performance in harsh Chemical Manufacturing environments. No issues with the Weir so far."
Technical Specifications Verified
P Procurement Specialist from Australia Jan 11, 2026
★★★★★
"Testing the Weir now; the technical reliability results are within 1% of the laboratory datasheet."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

6 sourcing managers are analyzing this specification now. Last inquiry for Weir from UAE (1h ago).

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Frequently Asked Questions

What is the primary function of a weir in chemical distillation trays?

A weir serves as a raised barrier on distillation trays that precisely controls liquid flow across the tray surface and maintains the required liquid level to ensure optimal vapor-liquid contact and separation efficiency in chemical manufacturing processes.

What materials are commonly used for weirs in chemical applications?

Weirs are typically constructed from corrosion-resistant materials including stainless steel (for general chemical resistance), carbon steel (for cost-effective applications), and alloy steels (for specialized high-temperature or corrosive environments in chemical manufacturing).

What components are included in a standard weir assembly?

A complete weir assembly typically includes the weir plate (main barrier), mounting brackets for secure installation on distillation trays, and sealing gaskets to prevent leakage and ensure proper liquid containment and flow control.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Chemical Manufacturing sector.

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