Precision Cleaning in a Production Environment with High-Pressure Water

1992 ◽  
Vol 35 (4) ◽  
pp. 34-44
Author(s):  
R. Nagarajan ◽  
R. Welker
Keyword(s):  
High Pressure ◽  
Chlorinated Solvents ◽  
Disk Drive ◽  
Water Spray ◽  
Production Environment ◽  
Cleaning Efficiency ◽  
Contamination Control ◽  
Advantages And Disadvantages ◽  
Production Run ◽  
Pressure Water

The increasing contamination control requirements for disk drives, and the prevailing mandate to climinate chlorinated solvents in cleaning applications have allowed high-pressure water spray to emerge as an effective and environmentally sound method for cleaning. Certain substrates, such as machined metals and alloys, can be cleaned using high-pressure water to state-of-the-art cleanliness levels. Following developmental investigations in the laboratory, two cleaners utilizing high-pressure (up to 3000 psig), high-flow (up to 50 gpm) water have been procured for use at suppliers of critical disk-drive components. Acceptance-runoff, certification, and production-run cleanliness data pertaining two the two high-pressure cleaners are presented here in terms of liquid-born particle counts on contaminants extracted from substrates ultrasonically, or by means of a low-pressure water spray. Results indicate that residual particulate contamination levels on high-pressure sprayed parts may be lower by more than two orders of magnitude compared with those obtained by more conventional cleaning methods. The cleaning efficiency increases significantly with particle size. The importance of nozzle manifold design and placement, for both cleaning and drying, is demonstrated quantitatively with examples of the deleterious consequences of not optimizing them. The underlying cleaning mechanism is explained briefly. Potential advantages and disadvantages associated with high-pressure water spray cleaning are fully discussed, and recommendations are offered for utilizing this technology most effectively.

Options for the Removal of Contaminated Concrete From the Bore of the Windscale Pile Chimney

2009 ◽  
Author(s):  
Colin Campbell ◽  
Stephen Hepworth ◽  
Jeremy Hunt
Keyword(s):  
High Pressure ◽  
Internal Surface ◽  
Secondary Effluent ◽  
Advantages And Disadvantages ◽  
Pressure Water ◽  
Reaction Forces ◽  
Future Strategy ◽  
Inherent Problem ◽  
Mechanical Devices ◽  
Effluent Waste

A legacy of the 1957 Windscale Pile reactor fire is the penetration of radioactive contamination into the internal surface concrete of the chimney bore. Gamma imaging of Cs-137 has shown that the contamination is widespread throughout the chimney, and core samples have shown that the contamination has penetrated to depths of around 5–25mm. The Pile chimney is 100m tall and has an internal bore diameter of 15m. It is constructed of a hard concrete comprised of Whinstone aggregate. The baseline decommissioning scheme is to remove approximately 5–25mm of the surface concrete from the entire bore of the chimney. The technology baseline in 2006 was to remove layers of contaminated concrete by mechanical means using shavers or scabblers. However, risks associated with mechanical technologies that may preclude their use include: the ability of mechanical devices to remove the hard concrete; clogging of the devices due to wet concrete; and deployment of the delivery systems. This paper discusses the options under consideration to reduce the risks associated with the removal of the contaminated concrete through application of alternative techniques. The present baseline technology is high pressure water jetting technique. Demonstrations have shown that this technology can successfully remove concrete without significant reaction forces. However, an inherent problem with this technology is the production of secondary liquid effluent waste, which would need to be treated by an appropriate conditioning process. To address the secondary effluent waste issue, technologies that produce little or no secondary waste have been considered. The technologies that have been considered are laser scabbling, microwave scabbling and nitrogen jet blasting. The paper discusses each technique in turn, highlighting their advantages and disadvantages. The results of an in-active laser scabbling and high pressure liquid nitrogen jetting trial are presented. The paper concludes with a discussion of the merits of each technology in support of the future strategy for concrete removal.

scholarly journals Development of Hard Secondary Cooling by High-pressure Water Spray in Continuous Casting

2011 ◽  
Vol 51 (9) ◽  
pp. 1454-1460 ◽  
Author(s):  
Yoichi Ito ◽  
Takeshi Murai ◽  
Yuji Miki ◽  
Masayuki Mitsuzono ◽  
Takatoshi Goto
Keyword(s):  
High Pressure ◽  
Continuous Casting ◽  
Water Spray ◽  
Secondary Cooling ◽  
Pressure Water

Study on the Application of Water Jet Technology in Artillery Maintenance

2014 ◽  
Vol 697 ◽  
pp. 322-326
Author(s):  
Yuan Jiang Chen ◽  
Hong Ge Xu ◽  
Qing Sheng Gao
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
Chemical Cleaning ◽  
Lubricating Grease ◽  
Advantages And Disadvantages ◽  
Mechanical Removal ◽  
Pressure Water ◽  
High Pressure Water Jet

To coat with much of lubricating grease is an effective approach to slow down the wearing and rusting trend of each mechanism, the lubricating grease must be removed before grease-change maintenance and overhauling of the artillery. At present, the grease removing methods mainly include physical heating, mechanical removal, chemical cleaning, etc. Comparing the advantages and disadvantages of various methods, this paper proposes to use the technology of a high-pressure water jet cleaning. This method overcomes the problems in the process of grease removal.

scholarly journals An outbreak of psittacosis in a bird park in Japan

2007 ◽  
Vol 136 (4) ◽  
pp. 492-495 ◽  
Author(s):  
T. MATSUI ◽  
K. NAKASHIMA ◽  
T. OHYAMA ◽  
J. KOBAYASHI ◽  
Y. ARIMA ◽  
...  
Keyword(s):  
Risk Factors ◽  
High Pressure ◽  
Cohort Study ◽  
Water Spray ◽  
Increased Risk ◽  
Chlamydophila Psittaci ◽  
Pressure Water ◽  
Student Interns

SUMMARYAn outbreak of psittacosis related to a bird park occurred in Matsue City, Shimane Prefecture, Japan, during winter 2001. Seventeen cases of psittacosis (12 visitors, three staff, and two student interns) were confirmed. A cohort study was conducted among the park staff and students to determine the risk factors for the development of acute serologically confirmed psittacosis (SCP) infection. Being ‘bird staff’ had an increased risk of SCP infection (RR 3·96, 95% CI 1·48–10·58). Entering the staff building, where ill birds were maintained without proper isolation, was also associated with an increased risk of SCP infection (RR 3·61, 95% CI 1·03–12·6). Isolation of ill birds and quarantine measures were found to be insufficient. Dehumidifiers and a high-pressure water spray under a closed ventilation environment may have raised the concentration of Chlamydophila psittaci in the hothouses. Bird park staff and visitors should be educated about psittacosis.

High-Pressure Water Spray Research Based on Neural Network

2010 ◽  
Vol 29-32 ◽  
pp. 138-142
Author(s):  
Rui Li ◽  
Zi Ming Kou
Keyword(s):  
Neural Network ◽  
High Pressure ◽  
Influencing Factors ◽  
Back Propagation ◽  
Back Propagation Neural Network ◽  
Industrial Processes ◽  
Water Spray ◽  
Key Factors ◽  
Pressure Water ◽  
The Relationship

The spray cleaning method is important and universal in many industrial processes and other occasion. Because the size of the waterdrop is one of key factors for cleaning, this paper not only studied the relationship between the size of waterdrop and other influencing factors, but also researched the forecasted method for the size of waterdrop. In lab, by measuring the size of the waterdrop, jetted by one kind of nozzle, data were acquired and were used to train the Back Propagation Neural Network ( BPNN ). Through comparing those diameters, between measured in lab and calculated by BPNN after trained. It was acquired that the maximum errors was smaller than 1.62%, between the computed results and the factual measured ones. The experimental results showed that BPNN is an effective tool to predict the variation of the non-linear waterdrop diameter.

Effect of washing with a high pressure water spray on removal of Listeria innocua from Gorgonzola cheese rind

Food Control ◽  
2008 ◽  
Vol 19 (5) ◽  
pp. 521-525 ◽  
Author(s):  
Germano Mucchetti ◽  
Barbara Bonvini ◽  
Salvatore Francolino ◽  
Erasmo Neviani ◽  
Domenico Carminati
Keyword(s):  
High Pressure ◽  
Listeria Innocua ◽  
Water Spray ◽  
Pressure Water

scholarly journals HIGH-PRESSURE WATER SPRAY APPLICATION FOR AUTOMATIC FIRE EXTINCTION IN THE UNDERGROUND

Vestnik MGSU ◽  
2017 ◽  
pp. 669-673
Author(s):  
V.P. Prokhorov ◽  
E.S. Vagner
Keyword(s):  
High Pressure ◽  
Cost Effectiveness ◽  
Water Spray ◽  
Spray Application ◽  
Fire Extinguishing ◽  
Production Processes ◽  
Pressure Water ◽  
Hazardous Production ◽  
Important Object ◽  
Fire Extinction

The paper is devoted to ensuring the fire safety of an important object for the majority of megacities as the underground. The author examines in detail the fire-hazardous production processes and talks about the use of high-pressure water spray (WS) for extinguishing fires at underground facilities as the most effective firefighting measures. The paper describes the advantages of using of high-pressure water spray for automatic fire extinguishing in terms of safety and cost-effectiveness.

Experiments on aerosol removal by high-pressure water spray

2017 ◽  
Vol 311 ◽  
pp. 28-34 ◽  
Author(s):  
Ada del Corno ◽  
Sonia Morandi ◽  
Flavio Parozzi ◽  
Lucio Araneo ◽  
Francesco Casella
Keyword(s):  
High Pressure ◽  
Water Spray ◽  
Pressure Water
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