Flow Nozzle
ISO 5167-3 Compliant | High Temperature & Pressure | Low Pressure Loss
Product Overview
Flow nozzles combine the advantages of orifice plates and venturi tubes. They are particularly suitable for high temperature and high pressure steam and gas measurement, offering lower pressure loss and higher stability compared to orifice plates.
Key Features
- ✓ Full compliance with ISO 5167-3 international standard
- ✓ 60% lower pressure loss than orifice plates
- ✓ Optimized for high temperature and pressure environments
- ✓ Long service life with low maintenance costs
- ✓ Stable across wide Reynolds number range
Flow Nozzle
ISO 5167-3 Standard
Types of Flow Nozzles
ISA 1932 Nozzle
Standard Flow Nozzle
- Most widely used standard design
- 50mm ≤ D ≤ 500mm
- 0.3 ≤ β ≤ 0.8
- Re ≥ 70,000
Long Radius Nozzle
High Precision Measurement
- Highest accuracy available
- 50mm ≤ D ≤ 630mm
- 0.2 ≤ β ≤ 0.8
- Re ≥ 10,000
Venturi Nozzle
Low Pressure Loss
- Lowest pressure loss
- 65mm ≤ D ≤ 500mm
- 0.316 ≤ β ≤ 0.775
- Re ≥ 150,000
High Temperature Special Nozzle
Extreme Environments
- Up to 650°C high temperature
- Special heat-resistant steel
- Thermal expansion compensation
- Ceramic lining option
Technical Specifications
| Parameter | ISA 1932 | Long Radius | Venturi Nozzle |
|---|---|---|---|
| Accuracy | ±1.0% | ±0.8% | ±1.0% |
| Pressure Loss | 30-40% | 35-45% | 15-25% |
| Beta Ratio (β) | 0.3 - 0.8 | 0.2 - 0.8 | 0.316 - 0.775 |
| Reynolds Number | ≥ 70,000 | ≥ 10,000 | ≥ 150,000 |
| Pipe Size | 50-500mm | 50-630mm | 65-500mm |
| Straight Run Required | 10D / 5D | 10D / 5D | 5D / 2D |
Material Selection Guide
🔩 Carbon Steel
- ASTM A105 / A106
- Temperature: -29°C to 425°C
- Pressure: Up to 100 bar
- Use: General industrial
⚙️ Stainless Steel (SS316/316L)
- ASTM A182 F316/316L
- Temperature: -200°C to 550°C
- Pressure: Up to 200 bar
- Use: Corrosive fluids
🔥 Alloy Steel
- ASTM A182 F11/F22
- Temperature: -29°C to 650°C
- Pressure: Up to 320 bar
- Use: High temp & pressure
💎 Special Materials
- Hastelloy, Monel, Inconel
- Extreme corrosive environments
- Ultra-high temperature applications
- Custom fabrication available
Main Applications
Power Plants
- Boiler feedwater measurement
- Superheated steam flow
- Turbine steam measurement
- Cooling water systems
Petrochemical
- Refinery process control
- Distillation column flow
- Reactor feed lines
- Flare gas measurement
Steel Plants
- Blast furnace gas
- Coke oven gas
- Combustion air measurement
- Cooling water flow
HVAC
- Large HVAC systems
- District heating networks
- Industrial steam distribution
- Cooling tower systems
Advantages of Flow Nozzles
High Durability
Erosion resistant with long service life reducing maintenance costs
Stable Measurement
Maintains constant discharge coefficient over wide flow range
Low Pressure Loss
60% lower pressure loss than orifice plates saving energy
Extreme Conditions
Optimized for high temperature, pressure, and velocity fluids
Installation Guidelines
📏 Straight Run Requirements
| Upstream Disturbance | Minimum Straight Run (D) |
|---|---|
| Single 90° Elbow | 10D |
| Two 90° Elbows Same Plane | 14D |
| Two 90° Elbows Different Planes | 34D |
| Reducer (2D → D) | 15D |
| Expander (0.5D → D) | 22D |
| Fully Open Valve | 12D |
* D = Pipe inner diameter, Downstream requires minimum 5D
⚙️ Installation Precautions
- Prevent damage to sharp edge at nozzle inlet
- Ensure gasket does not obstruct flow path
- Proper flange alignment and bolt tightening
- Verify pressure tap position accuracy (±0.5mm)
- Complete removal of internal debris before installation
Selection Guide
Check Fluid Conditions
Fluid type, temperature, pressure, flow range
Calculate Beta Ratio
β = d/D (0.3 ~ 0.8 recommended)
Review Pressure Loss
Check allowable pressure loss range
Select Nozzle Type
Choose appropriate nozzle type for application
Select Material
Consider fluid properties and operating conditions
Flow Nozzle Inquiry
We provide optimized flow nozzle solutions for your process.