🌍 ISO 5167 Overview

ISO 5167 is the international standard for measuring fluid flow by differential pressure, providing detailed provisions for the design, installation and use of orifice plates, venturi tubes and flow nozzles. Daehan Instruments has manufactured precision flow meters in full compliance with this standard for 35 years.

📚 ISO 5167 Series

🔵

ISO 5167-1

General principles and requirements
Scope
General principles and requirements for DP flow meters
Key content
Measurement principle, uncertainty, installation requirements
Fluids
Single-phase Newtonian fluids (liquid, gas, steam)
⭕

ISO 5167-2

Orifice plates
Products
Orifice plates (concentric, eccentric, segmental)
Measurement Accuracy
±0.5% to ±2.0% (depending on conditions)
Beta ratio range
0.1 ≤ β ≤ 0.75
Reynolds Number
ReD ≥ 5,000
🌀

ISO 5167-3

Nozzles and Venturi nozzles
Products
ISA 1932 nozzle, long-radius nozzle, venturi nozzle
Measurement Accuracy
±0.7% ~ ±1.5%
Beta ratio range
0.3 ≤ β ≤ 0.8
Reynolds Number
ReD ≥ 5×10⁴
🔶

ISO 5167-4

Venturi tubes
Products
Classical venturi tube
Measurement Accuracy
±0.4% to ±1.0% (highest accuracy)
Beta ratio range
0.3 ≤ β ≤ 0.75
Pressure loss
Lowest (5–15%)
🎯

ISO 5167-5

Cone meters
Products
Cone meter
Measurement Accuracy
±0.5%
Beta ratio range
0.45 ≤ β ≤ 0.85
Features
Short straight run, high accuracy
🌊

ISO 5167-6

Wedge meters
Products
Wedge meter (V-shaped restriction)
Measurement Accuracy
±0.5% ~ ±1.0%
Fluids
Viscous fluids and fluids with suspended solids
Features
Self-cleaning, clog-resistant

🏭 Applications by Industry

Industrial applications of Daehan Instruments products built to ISO 5167

🛢️
Petrochemical
Crude oil, gasoline and chemical flow measurement in refineries and petrochemical plants
⚡
Power Plants
Steam, cooling water and feedwater flow measurement in thermal and nuclear power plants
🏭
Steel
Blast furnace gas, coke oven gas and industrial water flow measurement in steel mills
💊
Pharmaceutical
Precise flow control and measurement in pharmaceutical manufacturing
🌊
Water Treatment
Water flow measurement in waterworks, treatment plants and wastewater plants
🍺
Food & Beverage
Hygienic flow measurement in beverage, brewing and dairy processes

⚙️ Technical Specifications & Performance

Measurement Accuracy
±0.4% ~ ±2.0%
(depending on product and conditions)
Pressure range
Vacuum to 420 bar
(6,000 psi)
Temperature range
-200°C ~ +800°C
(-328°F ~ +1472°F)
Pipe size
25mm ~ 3000mm
(1 inch to 120 inch)
Materials
POSCO 316/316L SS
Hastelloy, Inconel, etc.
Certifications
ISO 9001/14001
ASME, KS certified
🇰🇷 Korean Excellence in Flow Measurement

POSCO premium stainless steel and 35 years of accumulated expertise,

we deliver high-quality flow metersin full compliance with the ISO 5167 international standard

"Leading Korean Manufacturer since 1989"