What is the best nozzle for strip drying in steel mills?

For strip drying applications such as pre-coat or rinse removal, Air Knives or Flat Jets are recommended. They provide uniform moisture removal across the entire width of the strip.

How do air amplifiers reduce energy consumption?

Air amplifiers utilize the Coanda effect to entrain surrounding ambient air, increasing airflow volume while using a smaller amount of compressed air, resulting in lower energy costs and reduced noise.

What is the recommended header spacing for blowoff nozzles?

Header spacing depends on spray angle and standoff distance. For a 45-degree nozzle at a 200mm standoff, the suggested spacing is approximately 116mm to ensure 30% overlap and consistent coverage.

Air Blowoff & Drying in Metalworking & Steel Mills

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Industrial Air Blowoff & Drying Systems

Effective air blowoff and drying are critical in steel and metal processing to remove water, rolling oils, and debris before coating or packaging. NozzlePro engineers high-efficiency air knives, flat jets, and air amplifiers designed to reduce compressed air consumption while ensuring uniform drying on strip, coil, and component lines.

Why Optimize Your Blowoff System?

Uniform Quality: Consistent moisture removal across the entire strip width and edges.
Energy Savings: Reduce compressed air usage by replacing open pipes with engineered air nozzles.
Higher Line Speeds: Achieve faster drying throughput without sacrificing surface finish.
Noise Reduction: OSHA-compliant designs for safer mill operations.

Comparative Air Consumption (at 2 bar)

Estimates for selection purposes. Lower Nm³/h indicates higher efficiency per nozzle.

Air Knife

~160 Nm³/h

Flat Jet

~90 Nm³/h

Round Jet

~65 Nm³/h

Amplifier

~40 Nm³/h

Table 1: Metalworking Application Map

Application	Goal	Recommended Nozzle	Tech Notes
Strip Drying (Pre-coat)	Remove rinse water	Air Knives / Flat Jets	Use edge boosters to prevent trailing water droplets.
Coil Blowoff	Dislodge trapped fluid	Round Jet Nozzles	Angle nozzles to evacuate water from ID/lap gaps.
Component Drying	Remove chips & coolant	Air Amplifiers	Utilizes the Coanda effect for high-volume, low-pressure air.
Edge Drying	Dry hems & flanges	Needle / Round Jets	Requires short standoff distance for high impact.

Drying Difficulty Heatmap

Use this guide to estimate system requirements based on line speed and water load.

Line Speed ↓ / Water Load →	Light	Moderate	Heavy
60–120 m/min	Low Demand	Med-Low	Medium
120–200 m/min	Med-Low	Medium	Med-High
200–300 m/min	Medium	Med-High	High Demand

Table 2: Technical Selection Guide

Nozzle Type	Air Use (Nm³/h @ 2 bar)	Noise Level (dB)	Ideal Application
Air Knife	120–200	74–82	Continuous sheet drying; excellent uniformity.
Flat Jet	30–90	72–80	Strip surfaces and conveyor cleaning.
Round Jet	20–65	70–78	Spot drying and high-impact edge blowing.
Air Amplifier	10–40	68–75	Energy-sensitive component drying.

Header Spacing & Coverage Planner

Formula: Coverage W ≈ 2 · L · tan(θ/2). Recommended overlap is ~30%.

Spray Angle (°)	Standoff L (mm)	Coverage W (mm)	Spacing S (mm)
30°	200	107	75
45°	200	165	116
60°	200	231	162

Engineer Your Solution

Don't guess on header spacing or air pressure. NozzlePro engineers calculate the exact air velocity and volume required for your specific line speed and water load.