CATALOGUE - DESCALING NOZZLES
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SPRAY NOZZLES FOR INDUSTRIAL APPLICATIONS

EXPERIENCE, KNOWLEDGE AND QUALITY FOR THE INDUSTRY PNR ITALIA manufactures and markets Today PNR ITALIA has at its disposal a technologically advanced small spraying nozzles for individual use production plant for the production of spraying nozzles, washing up to spraying systems for large heads and atomizers with absolute quality machines, many of industrial plants and is able to meet which work with CNC technology, often internally designed for every customer’s need with targeted special machining. With an annual production of about 9 million pieces, PNR ITALIA is The wide range of...

DESCALING NOZZES DESCALING TEST BENCH DESCALING NOZZLES PERFORMANCES DESCALING NOZZLES ACCESSORIES GENERAL INFORMATION PNR Headquarters - Voghera (Italy) DESCALING CATALOGUE

DESCALING NOZZLES DESCALING PRINCIPLES The impact of the water jet on the steel hot surface produces an impact force that, combined with the thermal action due to the temperature difference between jets and slabs, generates the descaling effect. The jet quality of the nozzle has a great effect upon the steel surface descaling in hot-rolling and is crucial for the quality of the final product. DESCALING NOZZLES FEATURE Descaling nozzles are used for an efficient scale removal in hot rolling. The best method is the hydro-mechanical descaling process using high pressure water jets formed by...

DESCALING TEST BENCH PNR provides its Customers the possibility to determine the performance of its descaling nozzles using a modern precise measurement of their flow rate at a given pressure. IMPACT PRESSURE ALONG X AXIS Effective Alpha Angle = 35,04 LEGENDA IMPACT PRESSURE ALONG Y AXIS Maximum pressure value found on the vertical axis intercept. Effective Beta Angle = 2,95 The rms value is calculated considering the average value of the impact pressure values of the 8 neighbouring points to the specific measuring point, in order to disregard the possible effect of local fluid veins. The...

PNR NEW DESCALING NOZZLES PNR HAS DEVELOPED A NEW RANGE OF HIGH PERFORMANCE DESCALING NOZZLES: EVOLUTION OF OUR FORMER MODEL HW/AB EVOLUTION OF OUR FORMER MODEL HW/AK EXTRA-HX TYPE descaling nozzles the flow straighteners were designed in order to minimize the flow turbulence, with a related 22% improvement of impact force. New nozzle tips design provides an uniform spray density along the spray width, with a reduced value of DP. AVERAGE IMPACT PRESSURE IMPROVED IMPACT PRESSURE, REDUCED ∆P SWINGS INTERCHANGEABILITY OF COMPONENTS WITH FORMER MODELS MINI SIZE Nozzle thread Straightener code...

DESCALING NOZZLES PERFORMANCES MINIMUM VALUE OF SPRAY WIDTH B - C (mm) AT FEEDING PRESSURE 150 BAR RACK ANGLE (β) 15° AND OFFSET ANGLE (γ) 15° SPRAY ANGLE Mentioned figures are valid for HX/GB series and HX/GK series. For remaining ranges values at mentioned pressure, rack and offset angles and at a spray height 150 mm are corresponding to nominal spray angle + 2° Nozzles Pitch E = Suggested minimum Pitch: NOZZLE TYPE GB - mini long HX series GK - standard long HX series None DESCALING CATAL

Type GB HIGH IMPACT NOZZLES MINI SIZE The water path leading to the nozzle orifice has been completely redesigned to reduce energy losses caused by turbulence, all sharp cross section changes have been eliminated resulting in a significant increase in water velocity at the nozzle orifice. SPRAY ANGLE CODES HXC *average value Stainless Steel AISI 303 Stainless Steel AISI 420 hardened Stainless Steel AISI 303 Tungsten carbide SPRAY PATTERN DIMENSIONS OF ASSEMBLED NOZZLES ZWA 0032 B2 A = Complete descaling unit length B = Welding nipple length C = Flow straightener protrusion

WELDING NIPPLE WELDING NIPPLE CODE Stainless Steel AISI 304 FLOW STABILIZER RG FLOW STABILIZER CODE without filter without filter with filter with filter with filter MATERIALS Body Flow stabilizer NOZZLE CODE GASKET CODE LOCKNUT CODE outside hexagon HOW TO ORDER PNR PRODUCTS MODEL SPRAY ANGLE ORDER EXAMPLE DESCALING CATALOGUE

Type GK HIGH IMPACT NOZZLES STANDARD SIZE The water path leading to the nozzle orifice has been completely redesigned to reduce energy losses caused by turbulence, all sharp cross section changes have been eliminated resulting in a significant increase in water velocity at the nozzle orifice. SPRAY ANGLE CODES HXC *average value Stainless Steel AISI 303 Stainless Steel AISI 420 hardened Stainless Steel AISI 303 Tungsten carbide SPRAY PATTERN DIMENSIONS OF ASSEMBLED NOZZLES ZWB 0073 B2 A = Complete descaling unit length B = Welding nipple length C = Flow straightener protrusion

WELDING NIPPLE WELDING NIPPLE CODE Stainless Steel AISI 304 FLOW STABILIZER FLOW STABILIZER CODE without filter without filter with filter with filter with filter MATERIALS Body Flow stabilizer NOZZLE CODE GASKET CODE LOCKNUT CODE outside hexagon HOW TO ORDER PNR PRODUCTS MODEL SPRAY ANGLE ORDER EXAMPLE DESCALING CATALOGUE

CLASSIC RANGE Type GW DOVE-TAIL NOZZLES GW series nozzles have been the worldwide standard for many years in hot descaling mills. They have undergone many improvements, specifically to the inner orifice profile, resulting in a very even distribution of the water jet impact onto the steel surface. Their typical design with a dove-tail coupling between nipple and nozzle tip assures for correct alignment of the nozzle onto the spray manifold. Several nipples length value and a specific locknut allow for a wide choice of different assembly dimensions. SPRAY ANGLE CODES GWF SPRAY PATTERN...

CLASSIC RANGE WELDING NIPPLE WELDING NIPPLE CODE Stainless Steel AISI 316L NOZZLE CODE DESCALING CATAL

CLASSIC RANGE Type AA SHORT NOZZLES MINI SIZE The modern design of these nozzle offers the same advantage as the full size HW nozzles. In addition it makes possible to use a smaller pitch between the nozzles allowing for a higher impact value per unit length. The nozzle efficiency is enhanced by means of a carefully designed flow stabilizer, which minimizes turbulence due to sharp direction change at the inlet from the main manifold. Provision is also made for a filter to be mounted at the nozzle inlet, minimizing nozzle clogging and abrasion. SPRAY ANGLE CODES HWF SPRAY PATTERN *average...