scholarly journals Process water system integrity: A metallurgical evaluation

1989 ◽  
Author(s):  
M. R. Louthan, Jr.
Keyword(s):  
Water System ◽  
Process Water ◽  
System Integrity ◽  
Metallurgical Evaluation

Optimization Design of FPSO Central Cooling Water System Based on Pipe Network Fluid Analysis

2019 ◽  
Author(s):  
Huan Zhang ◽  
Hongtao Yuan ◽  
Chao Wang ◽  
Weiwen Kong ◽  
Jiangguo Xu ◽  
...  
Keyword(s):  
Water System ◽  
Cooling Water ◽  
Normal Operation ◽  
Network System ◽  
Pipe Network ◽  
Economic Point ◽  
Power Generator ◽  
System Integrity ◽  
Cooling Water System ◽  
The Impact

Abstract Marine power generator plays important role to guarantee the normal operation of all subsystems of FPSO, in which cooling device are emphasized on its reliability and stability. As the main cooling system of FPSO power generator, the design of central cooling water system is very important. Traditional pipeline network system design is mainly based on the design manual and empirical formula, which single pipeline is designed for circulation of different media. Lacking the concept of system integrity, which results in the weak integrated design without rational consideration. In this paper, a FPSO central cooling water system is taken as the research object. Based on the initial design scheme, it is different from the empirical and singularity of traditional design, and the impact of the pipe network of cooling water system to that of other systems in the whole vessel is put into consideration on the comprehensive way. From the economic point of view, the study on the pipe network of flow balance is carried out, and the optimization scheme of the central cooling water pipe network system is proposed.

Cod Removal in a Closed Water Circuit of a Papermill by an Anaerobic Fluidized Bed Reactor

1992 ◽  
Vol 26 (1-2) ◽  
pp. 445-454 ◽  
Author(s):  
M. C. Barascud ◽  
F. Ehlinger ◽  
M. Pichon ◽  
J. Rouger
Keyword(s):  
Fluidized Bed ◽  
Water System ◽  
Anaerobic Treatment ◽  
Cod Removal ◽  
Process Water ◽  
Organic Load ◽  
Flow Sheet ◽  
Circulating Water ◽  
Biomass Activity ◽  
Closed Water

In waste paper processing mills, entirely closed process water systems cause high specific polluting problems, deteriorate the quality of the paper produced and corrode the equipment. Operating an anaerobic fluidized bed on part of the circulating water could make it possible to achieve lower dissolved organic concentration in the closed process water system. Laboratory experiments have been carried out according to the following flow-sheet : Water circuit; Acidification tank; Fluidized bed. When the anaerobic treatment is added to the water circuit, COD removal is 75% in the circuit and 65% in the acidification tank. Consequently, until reaching steady state, the organic load entering the fluidized bed decreases continuously from 28.75 to 9.86 kg COD/m3 d−l without disturbing biomass activity. From a mass balance, a mathematical model is drawn to check the COD removal in the water circuit and study the transitory period. Efficient fluidized bed performances are achieved even with high organic load (28.75 kgCOD/m3d−1) 52% to 75% COD removal are obtained in the water circuit respectively within 75 and 24 hours. The treated water represents a very small part of the circulating water. To achieve 52% COD removal the equivalent of 0.5 m3/t produced paper is treated. For a 75% COD removal efficiency, treated flow rate is 2.6 m3/t produced paper.

Recycled paper mill process water pre-treatment using ultrafiltration for water system closure

2021 ◽  
Vol 44 ◽  
pp. 102407
Author(s):  
Hans Estrella Cainglet ◽  
Tomas Saavedra ◽  
Stefan Bürgmayr ◽  
Jianhua Zhang ◽  
Zongli Xie ◽  
...  
Keyword(s):  
Water System ◽  
Paper Mill ◽  
Process Water ◽  
Recycled Paper ◽  
Pre Treatment ◽  
Mill Process

Service Water Life Cycle Management

2008 ◽  
Author(s):  
Eric J. Houston ◽  
Arlene S. Rahn ◽  
George J. Licina
Keyword(s):  
Nuclear Power ◽  
Deterministic Model ◽  
Operating Time ◽  
Water System ◽  
Water Systems ◽  
Most Probable Number ◽  
Probable Number ◽  
System Integrity ◽  
Service Water ◽  
Water Piping

Nuclear plant service water systems are a critical part of the facility’s infrastructure. System integrity and performance are vital for plant reliability and essential to achieving a plant life of 40 years and beyond. Corrosion, fouling (macrofouling, microfouling and sedimentation) and other effects that are detrimental to the reliability of the service water system led to the issue of NRC Generic Letter 89-13 “Service Water System Problems Affecting Safety-Related Equipment.” This generic letter continues to be a fundamental guideline for safety related service water systems at all U.S. nuclear plants. The low temperature and pressure service water piping systems are primarily degraded by corrosion. Because of the complexity and random nature of corrosion processes, it is nearly impossible to develop a mathematically deterministic model that accurately predicts pipe wall loss. However, if statistical distributions are used to describe the various corrosion processes, mathematical algorithms that incorporate all of the distributions, iterated a statistically significant number of times, can be used to forecast the most probable number of leaks. This paper predicts the condition of service water piping at Kewaunee Nuclear Power Plant using the described model and includes the expected number of through-wall leaks as a function of operating time.

Effluent-free papermaking: industrial experiences and latest developments in the German paper industry

2007 ◽  
Vol 55 (6) ◽  
pp. 205-211 ◽  
Author(s):  
U. Hamm ◽  
S. Schabel
Keyword(s):  
Paper Industry ◽  
Water System ◽  
Process Water ◽  
Paper Mills ◽  
Comprehensive Survey ◽  
Pros And Cons ◽  
Closed Water ◽  
Ongoing Development ◽  
White Water ◽  
Packaging Paper

Thanks to multiple recirculation of process water, the German paper industry has succeeded in decreasing the specific fresh water demand from an average of 50 m3/t thirty years ago to 13 m3/t today. Although the increasing closure of white water loops creates many problems, it is bound to be part of the German paper industry's ongoing development. For a few years, in the production of packaging paper, two paper mills have been running with a totally closed water system including different process water treatment plants as ‘kidneys’. This paper presents a comprehensive survey of the pros and cons of closed process water systems followed by significant examples of effluent-free production of corrugating medium and test liner. Additionally, operation experiences and economic aspects are discussed.

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