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  • 1
    Electronic Resource
    Electronic Resource
    Pressure pulsations in the piping of reciprocating pumps (1987)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 10 (1987), S. 262-271 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pressure pulsations in hydraulic systems, generated by reciprocating pumps, can cause serious problems with regard to plant safety and reliability. In particular, fatigue problems arise in high-pressure piping systems. The available knowledge is not sufficient for an accurate computation of pressure peaks in the piping of reciprocating pumps. A number of calculation models are available which, however, neglect both fluid compressibility and friction. This contribution presents a calculation method which allows a precise modelling of various pump installations. Comparison of calculated and experimental data shows a good agreement and provides a validation of the computational model.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270100132
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  • 2
    Electronic Resource
    Electronic Resource
    Verbesserung des Fördervorgangs kompressibler Schüttgüter mit Schnecken gegen Druck beim Extruderbetrieb (1996)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 68 (1996), S. 1462-1466 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330681115
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  • 3
    Electronic Resource
    Electronic Resource
    Schüttgutmechanische Gesichtspunkte bei der Auslegung von Schneckendosier-gerätenVortrag von G. Vetter auf dem Jahrestreffen der Verfahrens-Ingenieure, 27. bis 29. Sept. 1989 in Berlin. (1990)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 62 (1990), S. 224-225 
    Details
    ISSN: 0009-286X
    Keywords: Dosieren ; Schüttguttechnik ; Schneckendosierer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330620321
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  • 4
    Electronic Resource
    Electronic Resource
    Druckschwingungen durch oszillierende Verdrängerpumpen in RohrleitungssystemenVortrag von G. Vetter auf dem Jahrestreffen der Verfahrens-Ingenieure, 30. Sept. bis 2. Okt. 1992 in Wien. (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 677-692 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pressure Pulsations Caused by Reciprocating Pumps in Piping Systems. The safe design of piping installations for reciprocating pumps requires proper knowledge about the pump/installation interaction. In many cases critical resonance effects can be avoided by proper piping geometry or improved pump performance with respect to the volumetric efficiency (primary measures). Normally it is necessary to use various secondary dampening methods which can influence the acoustics of the piping system. Several examples of experimental computer simulations of damper action - upstream and downstream - are presented for fluidand gas-filled damper versions. The influence of entry geometry of the dampers is explained, hints on the proper geometry of the entries are given and the effects of various dampers and their influence on the total acoustics are discussed. Special reference is made to the effect of orifices as dissipative and acoustic elements in piping systems. The investigation shows the importance of analyzing of the total system of pump, piping installation and vessels or reactors and the application of computer simulation for piping design.
    Additional Material: 28 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330650603
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  • 5
    Electronic Resource
    Electronic Resource
    Rühreinrichtungen in Schneckendosiergeräten  -  Wirkung und AuslegungsstrategieNach einem Vortrag der Verfasser auf der Sitzung des GVC-Ausschusses „Agglomerationstechnik“ am 3.5. 1993 in Goslar sowie teilweiser Auszug der Dissertation von H. Wolfschaffner. (1994)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 163-171 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Stirring Devices in Screw Metering Equipment - Action and Design Strategy. The accurarcy of metering by screw dosage equipment with or without gravimetric control depends primarily on the flow of material to the discharging screw. In the case of cohesive solids, stirring devices are generally required to prevent bridging. Experimental observations show that flow conditions correlate directly with the intensity of stirring. Mass flow in the metering container and hence optimum constancy of metering are attainable only from certain stirring efficiencies upwards. Cases of interference to metering due to poor flow of solids can be explained and overcome by modified dimensioning. The effects of the principal parameters - geometry and speed of rotation of the stirrer - are studied with the aid of two stirrer configurations - viz. overhead and concentric. Straightforward model calculations provide a mathematical method of estimation for optimum and reliable stirrer dimensioning also applicable to strongly cohesive solids.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330660204
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  • 6
    Electronic Resource
    Electronic Resource
    Verschleiß selbsttätiger Pumpenventile durch abrasive SuspensionenErweiterte Fassung eines Vortrages von U. Störk auf der Sitzung des GVC-Fachausschusses „Hochdruckverfahrenstechnik“, 11./12. April 1986 in Erlangen. (1987)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 59 (1987), S. 383-392 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Wear of automatic pump valves by abrasive suspensions. In pumping of abrasive suspensions with reciprocating displacement pumps against high pressures, the pump valves prove to be subject to serious wear. Wear of the piston seal can usually be avoided by washing or by separating membranes. Pump valves are fitted with elastic or rigid seals. To resist corrosion and temperature effects, frequently the only possible approach is to finish them in metallic or carbide materials. The major kinds of wear are demonstrated by a tribological study. The rates of wear found for a real valve model with a high pressure experimental setup depend upon the pressure and frequency of reciprocation. A hardness-dependent region of instability exists where wear scoring arises. The volume wear rate for various arrangements of materials and abrasive particles exhibits a crest/trough nature. A design strategy and construction aspects are considered and compared with practical experience.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330590505
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  • 7
    Electronic Resource
    Electronic Resource
    Untersuchungen an Dosierpumpen für die VerfahrenstechnikVortrag auf dem Jahrestreffen der Verfahrens-Ingenieure, 6. bis 8. Oktober 1963 in Hannover. (1964)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 36 (1964), S. 185-191 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Die Anwendungsmöglichkeiten von Dosierpumpen in der Verfahrenstechnik werden durch Fördermedium, Druck, Temperatur und Fördermenge bestimmt. Das Förderverhalten oszillierender Verdrängerpumpen ist vor allem von der Kompressibilität, der Viscosität und dem Dampfdruck des Fördermediums abhängig. Untersuchungen zur Ermittlung der Dosiergenauigkeit bei verschiedenen Bedingungen zeigen, daß Dosierpumpen bei geeigneter Ausführung und passenden Randbedingungen genau arbeiten. Für die Gewährleistung der Dosiergenauigkeit sind Maßnahmen erforderlich, um den Verschleiß niedrig zu halten. Besondere Anforderungen stellen Entwicklung und Bau von Dosierpumpen für Drucke bis 3000 at.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330360304
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  • 8
    Electronic Resource
    Electronic Resource
    Fatigue of thick-walled pipes from soft martensitic and semi-austenitic chrome-nickel steels under pulsating internal pressure (1992)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 15 (1992), S. 300-312 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Thick-walled components subjected to pulsating internal pressure are widely applied in high-pressure technology and in manufacturing processes such as fluid-jet cutting and high-pressure cleaning, mainly in conjunction with reciprocating pumps. Corrosive fluids require high-strength and tough chrome-nickel steels with soft martensitic or semi-austenitic structure. This contribution reports on the fatigue of thick-walled plain and cross-bored pipes made from high alloy chrome-nickel steels such as X5 CrNiMoCu 21 8 and X5 CrNiMo 16 5. The speciments, uniaxial standard form and thick-walled pipes, were cut from forged blocks in the three axial directions. For loading with pulsating pressure, a suitable, high-frequency piston pulsation machine has been developed. The fatigue tests on pipe specimens show typical Woehler characteristics with only slight scatter and relatively good isotropy. The surprisingly large admissible pulsating pressure can be explained for the applied steels by dynamic generation of residual stresses as a result of shake-down effects. Presentation in a Smith digram explains the occuring dynamic shake-down and its favourable results in comparison to the more brittle highly tensile steels. It also reveals that heat treatment to higher tensile strength does not always yield an increase in the admissible pulsating pressure. It will be shown that static autofretting and shake-down affect the fatigue strength of thick-walled pipe specimens in the same way. Tests with internal liners in the tube specimens provide indications on the sensitivity of material failures towards fluids. The investigation aids the understanding of the fatigue behaviour and the design of components made of modern high-strength corrosion resistant steels.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270150504
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  • 9
    Electronic Resource
    Electronic Resource
    Stand und Trends bei der Entwicklung leckfreier oszillierender VerdrängerpumpenVortrag auf der Pumpentagung 84, vom 2. bis 4. Okt. 1984 in Karlsruhe. (1985)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 57 (1985), S. 218-229 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Leakfree oscillating positive-displacement pumps - state of the art and trends of development. Leak- and maintenance-free oscillating positive-displacement pumps are very important for avoiding pollution and improving the reliability of plants. Technical progress in the field of hydraulic diaphragm- and tube-pumps for high pressures are explained. The actual data (pressure, efficiency, temperature) and experience with different fluids are surveyed. The various hydraulic control systems, the diaphragm design, and methods for rupture-control are compared. Further development trends are explained.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330570306
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  • 10
    Electronic Resource
    Electronic Resource
    Pumpen und Verdichter für hohe Drücke  -  Festigkeit, Dichtungen, VerschleißVortrag auf dem Jahrestreffen der Verfahrens-Ingenieure, 25. bis 27. Sept. 1985 in Hamburg. (1986)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 58 (1986), S. 183-195 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pumps and compressors for high pressures - strength, seals, wear. In high pressure processes pumps and compressors are used for the pressure range of 100 to 4 000 bar. Very careful design is necessary because of the extreme mechanical demands. The special features of high pressure technology are explained. The methods used for generating high pressures - displacement or fluid flow machine - impose design limitations, partly by the final temperature, Mach number, material fatigue, or vibrations. A survey of typical high pressure pumps and compressors shows the range and limitations of application. There is a definite trend to leak-free systems. The best design of thick-walled components with pulsating pressureload avoids grooves, requires smooth surfaces, and uses tough, clean, and high-strength steels. The various designs of dynamic seals are explained and the state of the art is depicted. Detailed reference is also made to the exceptionally difficult wear problem of oscillating pump valves with abrasive suspensions.
    Additional Material: 26 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330580304
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