Delavan Spray Technologies

The continuous casting of metals is a relatively new process in the steel industry, but tremendous strides in development have been made in recent years. In the constant pursuit of technological advancements, Delavan’s engineering staff have worked with steel mills world-wide to implement many improvements in the casting process. The result of much research and development is the Delavan Cool-Cast nozzle, which with its tightly uniform droplet size can significantly improve slab quality and reduce energy costs in your continuous casting operation. The cooling process is more controllable, with reduced tendency for water puddling and localized uneven cooling or thermally induced roller deflection. The flat spray pattern is thick, even over angles from 60° to 120°, offering good coverage with few nozzles.

Cool-Cast Advantages

• Patented nozzle design which
  produces highly uniform
  droplets with constant surface
  area per given spray volume
• More controllable and even
  cooling characteristics
• Reduced air consumption,
  saving energy through reduced
  air compressor load
• Wide passages prevent plugging
• Maximum heat transfer
• Large turn-down ratio
• Constant spray angle over
  wide pressure range

Producing steel in today’s market from slabs to bar mills including secondary cooling during the casting process requires efficient spray nozzles. Delavan’s newest ‘Block Style’ Cool-Cast nozzle offers flexibility in alignment for tight space in-between the framed segments. The ability to use quick connect couplings with the parallel piping gives operators access to quick release nozzles during rebuilds. With interchangeable components, liquid and air can be easily adjusted to meet product changes for various grades of products. The all stainless steel construction extends the durability and life of the nozzle in harsh environments. Typically Cool-Cast nozzles produce results using less air than other types, further reducing cost of ownership. The ‘Block Style’ Cool-Cast nozzle has different thread sizes and liquid connections to avoid misalignment.

Block Design Features

• Inlet connections are parallel; there are no elbows required for product installation
• Easier maintenance; nozzles always go back into original installation, no re-alignment is necessary
• Fluid orifice can be removed and cleaned/replaced without removing nozzle assembly
• More robust with less joints
• Easier installation
• Patented fluid inlet can permit larger orifice sizes for equivalent flow rates

The original round design of the Cool-Cast nozzle has a lower initial capital cost than the block design, yet still provides the same outstanding spray cooling performance and operational characteristics of the Block version.

Increase Cooling Efficiency...Decrease Operating Costs

Delavan’s patented ASPIRFLO™ series nozzles can do both. By replacing conventional flat spray nozzles with the Delavan AI aspirating nozzle, you can increase cooling efficiency up to 25%.

Spray Characteristics

• Even aspirated spray
• Higher velocity than conventional nozzles
• Increase droplet surface areas
• Uses free air
• Available spray angles 40°, 80°, 110°, 140°

Construction and Materials

• Brass or 303 stainless steel
• Available in 1/2, 3/4 or 1” thread
• Stainless Steel metering orifice
• Replaceable tip

Maximum Design Pressure: 200 PSI (14 Bar)

Maximum Design Temperature: 500°F (260°C)

Spray Characteristics

• Produces highly uniform flat spray at pressures up to 4000 PSIG (275 Bar.G.)
• Maximum impinging force is produced with a minimum loss of energy resulting in higher efficiency
• Spray pattern has knife-like cutting edge
• Available spray angles of 25° and 32°

Construction and Materials

• Unique connection nozzle/body for positive alignment

• Mild steel cap

• Tungsten carbide orifice for maximum wear resistance

• Strainer available in several styles

• Mild steel body with 3/4” - 14 NPTM threads and 1” - 11 - 1/2” NPTM threads or welding nipple type

• Cap and body also available in 303 Stainless Steel by special order

Maximum Recommended Pressure: 275 Bar.G.

Spray Characteristics

• Produces highly uniform flat spray at high pressures
• Maximum impinging force is produced with a minimum loss of energy resulting in higher efficiency
• Spray pattern has knife-like cutting edge
• Normal spray angles of 25° and 32°
• Orifice insert is offset 15° to axis of dovetail

Construction and Materials

• Dovetail connection nozzle/body for positive alignment
• 3-piece design with male NPT thread or welding nipple body
• Stainless Steel bodies and caps
• Welding nipple body only available in mild steel
• Longer welding nipple bodies available to special order
• Nozzle is Stainless Steel with Tungsten Carbide orifice insert
• Tips, bodies, and caps can be ordered separately in different materials
• Threaded bodies are 3/4” or 1” Male NPT only

This nozzle type is also available as the DE type design with strainer and flow stabilizer.

Maximum Recommended Pressure: 275 Bar.G.

Spray Characteristics

• Produces a rectangular impact area and even distribution of water over the rectangular footprint to give soft cooling on thin slab casters
• Standard spray angles 105º x 35º and 105º x 20º
• Large free passageway
• Self-aligning dovetail tip utilizing the Delavan AD Body
• Orifice in line with dovetail - no off-set required

Construction and Materials

• Dovetail connection nozzle/body for positive alignment

• 3-piece construction including body, tip, and cap
• Weld bases and threaded bodies (1/2” and 3/4") available as standard
• Available in Brass and Stainless Steel