scholarly journals CaSO4Scale Formation on Vibrated Piping System in the Presence Citric Acid

2018 ◽  
Vol 31 ◽  
pp. 01001
Author(s):  
W. Mangestiyono ◽  
J. Jamari ◽  
S. Muryanto ◽  
A. P. Bayuseno
Keyword(s):  
Citric Acid ◽  
Deposition Rate ◽  
Vibration Frequency ◽  
Scale Formation ◽  
Mechanical Equipment ◽  
Piping System ◽  
Connecting Rod ◽  
Turbine Generator ◽  
Pipe Section ◽  
Crystal Phases

Vibration in many industries commonly generated by the operation mechanical equipment such as extruder, mixer, blower, compressor, turbine, generator etc. Vibration propagates into the floor and attacks the pipe around those mechanical equipment. In this paper, the influence of vibration in a pipe on the CaSO4scale formation was investigated to understand the effect of vibration on the kinetics, mass of scale, crystal phases and crystal polymorph. To generate vibration force, mechanical equipment was prepared consisted of electrical motor, crankshaft, connecting rod and a vibration table at where test pipe section mounted. Deposition rate increased significantly when the vibration affected to the system i.e. 0.5997 and 1.6705 gr/hr for vibration frequency 4.00 and 8.00 Hz. The addition 10.00 ppm of citric acid declined the deposition rate of 8 Hz experiment from 3.4599 gr/hr to 2.2865 gr/hr.

Preparation and Characterization of the Nano Powder for Al2O3-SiO2-CaF2 Glass by Homo-Precipitation Method

2007 ◽  
Vol 280-283 ◽  
pp. 1643-1646
Author(s):  
G.C. Yuan ◽  
Q.G. Wu ◽  
G.X. Zeng ◽  
X.H. Zhang
Keyword(s):  
Citric Acid ◽  
Amorphous Structure ◽  
Precipitation Method ◽  
Inorganic Salts ◽  
Mixture Ratio ◽  
Nano Powder ◽  
Desiccation Process ◽  
Amorphous Compounds ◽  
Crystal Phases

The nano-powder of Al2O3-SiO2-CaF2 bio-glass was prepared by the homo-precipitation method with some inorganic salts containing Al3+, Ca2+, Na+, F-, SiO3 2+, Cl- as starting-reagents. The composition and characteristics of the powders were studied with XRD, EDAX, TEM and DTA. The results indicate that the prepared powder belongs to amorphous compounds containing Al, Ca, Si, O and F atoms and the size of particle is in the range of 30 ~ 70 nm. Adding citric acid and the well-controlled desiccation process can slightly improve the dispersing effect of the powders; the mixture ratio of the reagents rarely affects the characteristic of powder. The crystal phase CaF2 was precipitated firstly from the amorphous structure when the temperature is above 600°C, with the temperature rising, Al2SiO5 and Al4.4Si1.2O9.5 etc. crystal phases were precipitated sequentially.

Finite Element Formulation and Vibration Frequency Analysis of a Fluid Filled Pipe

2005 ◽  
Author(s):  
Yi Jia ◽  
Reinaldo E. Madeira ◽  
Frederick Just-Agosto
Keyword(s):  
Finite Element ◽  
Coriolis Force ◽  
Frequency Analysis ◽  
Cross Sections ◽  
Vibration Frequency ◽  
Dynamic Performance ◽  
Element Model ◽  
Piping System ◽  
Element Formulation ◽  
Variable Cross

This paper presents the formulation of a finite element model and vibration frequency analysis of a fluid filled pipe having variable cross sections. The finite element method with consideration of Coriolis force developed in [1] was adopted for frequency analysis of a pipe in this study. The stiffness matrix, the c-matrix (Coriolis force) and mass (for dynamic analysis) matrix that contain all parameters of the fluids properties and flow conditions have been developed. The numerical model was employed to simulate the dynamic performance of the piping system with the specific configurations for an application. A critical relationship between the natural frequencies and pipe geometry has been established. The results of frequencies analysis of the piping system gave us an insight whether a resonance frequency might occur.

The Influence of Piping Arrangement on the Response of Vibration Isolation System Under Underwater Explosion Loading

2019 ◽  
Author(s):  
Chen Pan ◽  
Wei Qiang ◽  
Liu Zhizhong ◽  
Wang Guan
Keyword(s):  
Shock Loading ◽  
Vibration Isolation ◽  
Underwater Explosion ◽  
Mechanical Equipment ◽  
Piping System ◽  
Flexible Pipe ◽  
Isolation System ◽  
Floating Raft ◽  
Shock Resistance ◽  
Actual Response

Abstract The response of ship equipment under non-contact underwater explosion shock loading was one of the main loadings of equipment. In order to cut down mechanical noise caused by mechanical equipment, vibration isolation measures, such as floating raft, vibration isolation, were widely used on noise mechanical equipments in acoustical stealth of ship, vibration isolation can reduce the vibration transfer to install base effectively, while the anti-shock resistance of vibration isolation and the equipment was important synchronously, as for the response of the equipment on vibration isolation, especially the actual response of the vibration isolation with piping system under shock loading. In this paper, the research on the response of vibration isolation, equipment, flexible piping and piping under underwater explosion shock loading were considered together, and the response of vibration isolation under shock load was analyzed with different piping arrangement. Found that the piping system has a significant impact on the response of the equipment under horizontal impact, but almost all equipments were assessed in experiment without considering the piping system. With the precondition of the effect of vibration isolation, a more rigid flexible pipe can be taken was benefit to the anti-shock resistance of vibration isolation.

The Kinetic Aspect of CaCO3 Scale Formation in the Solenoid Magnetic Field in the Various Temperatures of Solution in Piping System

2019 ◽  
Vol 13 ◽  
pp. 299-304
Author(s):  
Sutomo Sutomo ◽  
Stefanus Muryanto ◽  
Wiji Mangestiono ◽  
Jamari Jamari ◽  
Athanasius Priharyoto Bayuseno
Keyword(s):  
Magnetic Field ◽  
Scale Formation ◽  
Piping System ◽  
Kinetic Aspect

Electrophoretic Deposition of Green Parts for LPS SiC-Based Ceramics

2006 ◽  
Vol 314 ◽  
pp. 45-50 ◽  
Author(s):  
Saša Novak ◽  
Goran Dražič ◽  
Katja Mejak
Keyword(s):  
Silicon Carbide ◽  
Citric Acid ◽  
Liquid Phase ◽  
Deposition Rate ◽  
Electrophoretic Deposition ◽  
Aluminum Phosphate ◽  
Sintering Additives ◽  
Solids Loading ◽  
Solids Content

Electrophoretic deposition of silicon carbide in ethanol suspensions was studied with the aim to fabricate liquid-phase sintered (LPS) SiC-based ceramics densified at temperatures below 1500°C. The effect of suspensions composition (solids content, pH, sintering additives) on the deposition rate and the properties of the deposits was analysed. The consistency of deposits and their solids loading was found to be significantly dependent on composition of the starting suspension: the highest solids loading (54.5 vol. %) for pure SiC was obtained with the addition of citric acid, while for the suspension containing aluminum phosphate the deposition was more successful from alkaline suspensions.

Direct observations of membrane scale in membrane bioreactor for wastewater treatment application

2010 ◽  
Vol 61 (9) ◽  
pp. 2267-2272 ◽  
Author(s):  
J. Kim ◽  
T. I. Yoon
Keyword(s):  
Citric Acid ◽  
Sodium Hypochlorite ◽  
Membrane Bioreactor ◽  
Membrane Surface ◽  
Pilot Scale ◽  
Scale Formation ◽  
Membrane Pores ◽  
Direct Observations ◽  
Treatment Application ◽  
Inorganic Fouling

The formation of inorganic fouling on MF membrane was investigated in membrane bioreactor (MBR) treating industrial wastewater. Membrane autopsy works using microscopic techniques and surface analysis were carried out at the completion of pilot-scale operation to analyze foulant materials extensively. Scaling occurred on the membrane surface significantly in the MBR treating calcium-rich wastewater (LSI > 2.0). Our experiments showed that the coverage of the membrane surface by the inorganic fouling consisted mostly of calcium while the internal fouling within membrane pores due to the scale formation was almost negligible. Most of calcium was rejected on the MF membrane surface as scale formation of calcium carbonate (>90% as rejection). The sequence sodium hypochlorite-citric acid for the removal of membrane scale was more effective than the sequence citric acid-sodium hypochlorite cleaning. It appeared that the structure of organic compounds combined with calcium became loose by the addition of the sodium hypochlorite, thereby releasing calcium more easily from the membrane by applying the acid cleaning agent.

scholarly journals Vibration Modal Analysis and Optimization of the Motor Base

2018 ◽  
Vol 175 ◽  
pp. 03046 ◽  
Author(s):  
Meiling Qiu ◽  
Dafang Wang ◽  
Hui Wei ◽  
Xiu Liang ◽  
Yue Ma
Keyword(s):  
Modal Analysis ◽  
Natural Frequency ◽  
Vibration Frequency ◽  
Natural Frequencies ◽  
Mechanical Equipment ◽  
Boundary Constraints ◽  
Vibration Modal ◽  
Different Thickness

When the motor works normally, its base will vibrate. The structure will generate the resonance and result in damage of the mechanical equipment when the vibration frequency reaches the natural frequency. The article which is based on the modal analysis of the motor base compares the natural frequencies in different boundary constraints in order to select appropriate way to install the motor base, and optimizes the motor base by contrasting different effects on the natural frequencies of the different thickness of the ribbed plates for selecting reasonable structure to prevent resonance.

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