New PDF release: Hydroblasting and Coating of Steel Structures

By A. Momber

ISBN-10: 0080508413

ISBN-13: 9780080508412

ISBN-10: 185617395X

ISBN-13: 9781856173957

KEY positive aspects: • this method is transforming into in value. • the 1st accomplished publication during this subject.A sensible and finished account of the expertise and functions of hydroblasting, a strategy used a growing number of within the coaching of metal and different surfaces.Steel surfaces will corrode except they're safely ready and covered. Such corrosion could have disastrous results (eg bridge cave in) for that reason the education of the outside is of significant importance.Due to environmental strain to maneuver clear of grit-blasting, high-pressure water can now be used to arrange surfaces, with few environmental costs.This ebook systematically and significantly reports the country of present hydroblasting expertise and its functions. The e-book is largely functional in nature and is written by way of knowledgeable within the box.

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Extra info for Hydroblasting and Coating of Steel Structures

Example text

13(a). It can be noticed that the function approaches Eq. 2 9) with three characteristic parameters: a threshold nozzle diameter dw, a progress parameter A2, and a power exponent B 2. 05 mm; this was far from the diameter of commercially applied nozzles. The progress parameter A2 increased as traverse rate decreased. For low traverse rates, the power parameter was B 2 > 1. 13(b) illustrates the influence of the nozzle diameter on the cleaning width. The relation was equal to that obtained for the pump pressure.

2 Process p a r a m e t e r s Process parameters in hydroblasting are shown in Fig. 10(b). They can be subdivided into hydraulic parameters and performance parameters. 10 Target and process parameters for hydroblasting. Hydroblastingand Coating of Steel Structures 30 parameters characterise the pump-nozzle-system; they include the following: 9 9 9 operating pressure (p)" volumetric flow rate (Q); nozzle diameter (dN). 2 in Chapter 3. Performance parameters are more related to the process performance and include the following: 9 9 9 stand-off distance (x); traverse rate (Vw); impact angle (4,).

The certain value of the p a r a m e t e r / z depends on nozzle design, pump pressure and nozzle diameter. 95 (Momber and Kovacevic, 1998). 2. 95) is v] = 671 m/s. s) Ej = 1/2 9thw" v~" tE. The actual water mass flow rate is fnw = Qw " Pw -- AN" vj " P w a -(-rr/4)" d 2 . vj" Pw. 6) In this equation, a is a nozzle orifice parameter that considers the reduction in the volumetric flow rate due to the sudden changes in the fluid conditions in a nozzle with a sharp orifice. Basically, for diamond orifices, its value is about O.

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Hydroblasting and Coating of Steel Structures by A. Momber


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