---
title: "Flow Control Weir"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:FLOW_CONTROL_WEIR"
  data_integrity_hash: "559d92766f4d3228a200fac153ca4297"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:FLOW_CONTROL_WEIR"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/flow-control-weir.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/flow-control-weir"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.1-2.5 m³/s flow rate, 0.5-3.0 m hydraulic head"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 2.8
    unit: "m"
    consequence: "Cavitation-induced pitting at vena contracta when local pressure drops below 2.3 kPa absolute (vapor pressure at 20°C), causing material erosion and structural fatigue"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Sediment accumulation exceeding 150 mm at weir base"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Install upstream sediment trap with 45° inclined screens and automated flush valve at 120 kPa backflush pressure"
  - node_2:
      trigger: "Thermal expansion differential of 1.2×10⁻⁵ m/m·K between stainless steel (17.3×10⁻⁶) and concrete (12×10⁻⁶) mounting"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Design with expansion joints using 3 mm neoprene gaskets and slotted bolt holes with 5 mm clearance"
bom_nodes:
  weir-plate:
    type: "component"
    urn: "URN:CNFX:ME:WEIR_PLATE"
    interface_type: "physical-logic-coupled"
  support-brackets:
    type: "component"
    urn: "URN:CNFX:ME:SUPPORT_BRACKETS"
    interface_type: "physical-logic-coupled"
  adjustment-mechanism:
    type: "part"
    urn: "URN:CNFX:ME:ADJUSTMENT_MECHANISM"
    interface_type: "physical-logic-coupled"
  sealing-gasket:
    type: "component"
    urn: "URN:CNFX:ME:SEALING_GASKET"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 1438:2017 - HYDROMETRY - OPEN CHANNEL FLOW MEASUREMENT USING THIN-PLATE WEIRS"
    scope: "Verified Engineering Specification"
  - standard: "ANSI/ASME MFC-14M-2003 - MEASUREMENT OF FLUID FLOW USING SMALL BORE PRECISION ORIFICE METERS"
    scope: "Verified Engineering Specification"
  - standard: "DIN 1952 - FLOW MEASUREMENT WITH STANDARD NOZZLES, ORIFICE PLATES AND VENTURI TUBES"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/flow-control-weir.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "087153c0cdd0abe32c07503034409738e3bcac59374475e9023e40955f588140"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Flow Control Weir

## 1. Technical Definition
A hydraulic structure within a separation chamber or launder designed to regulate and control the flow rate of liquids.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.1-2.5 m³/s flow rate, 0.5-3.0 m hydraulic head**. Failure boundary: **Flow velocity exceeding 2.8 m/s at weir crest or hydraulic head differential &gt;3.5 m**, Mechanism: **Cavitation-induced pitting at vena contracta when local pressure drops below 2.3 kPa absolute (vapor pressure at 20°C), causing material erosion and structural fatigue**.

### 2.1 Analytical Physics Model
Governed by the **Darcy-Weisbach Pressure Drop**:

> **Primary Equation**: $\Delta P = f \cdot \frac{L}{D} \cdot \frac{\rho v^2}{2}$  
> **Engineering Impact**: Critical for sizing CIP (Clean-In-Place) pump heads.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| f | Friction Factor | Engineering Constant |
| L | Pipe Length | Engineering Constant |
| v | Velocity | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Sediment accumulation exceeding 150 mm at weir base | 8 | Hydraulic profile distortion causing flow separation and vortex shedding at 15-25 Hz | Install upstream sediment trap with 45° inclined screens and automated flush valve at 120 kPa backflush pressure |
| Thermal expansion differential of 1.2×10⁻⁵ m/m·K between stainless steel (17.3×10⁻⁶) and concrete (12×10⁻⁶) mounting | 8 | Stress concentration at anchor bolts exceeding 240 MPa yield strength, leading to bolt shear failure | Design with expansion joints using 3 mm neoprene gaskets and slotted bolt holes with 5 mm clearance |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Adjustment Mechanism](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/adjustment-mechanism.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Pump System**, **Flow Meter**, **Control Valve**  
**Downstream Applications**: Water Treatment Systems, Mining Slurry Processing Equipment, Chemical Processing Plants  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What materials are available for flow control weirs?
**A**: Our flow control weirs are manufactured in stainless steel for corrosion resistance, carbon steel for durability, and polypropylene for chemical compatibility.

### Q: How does the adjustment mechanism work on a flow control weir?
**A**: The adjustment mechanism allows precise vertical positioning of the weir plate to control liquid height and flow rate within the separation chamber or launder.

### Q: What industries use flow control weirs?
**A**: Flow control weirs are essential in water treatment, mining, chemical processing, and industrial manufacturing where precise liquid flow regulation is required.

## 6. Manufacturing Compliance
- ISO 1438:2017 - HYDROMETRY - OPEN CHANNEL FLOW MEASUREMENT USING THIN-PLATE WEIRS
- ANSI/ASME MFC-14M-2003 - MEASUREMENT OF FLUID FLOW USING SMALL BORE PRECISION ORIFICE METERS
- DIN 1952 - FLOW MEASUREMENT WITH STANDARD NOZZLES, ORIFICE PLATES AND VENTURI TUBES

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Flow Control Weir](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/flow-control-weir)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: FLOW_CONTROL_WEIR | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 61417fc1
