Search results

For deep water subsea, all seals experiencing hydrostatic pressure should have bidirectional capability [1].
In monophase flow pressure surge, frequently called a water hammer, may be caused by a pump shutdown or a closed valve.
References [1] Bai and Bai, Subsea engineering handbook, Gulf professional publishing, 2012, section 21.3
[2] Guo, Song, Chacjo and Ghalambor, Offshore pipelines, Gulf professional publishing, 2005, p. 121 [3] ASTM SA-182/SA182M Specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves and parts for high –temperature service, 2008A, section 5.4
[22] Ingolf fra Holmslet, private comunications, Dec 12, 2012, ingolf@valve.no [23] NS-EN 12266-1:2012 [24] Bai and Bai, Subseqa engineering handbook, Gulf professional publishing, 2012, p. 392.

By the investigation of the performances of heat transfer between refrigerant and water in condenser/evaporator and flow resistance in water side, whether the non energy saving operating faults in water side or not can be identified.
In summer, the reclaimed water is taken as cooling water flowing through condenser, while the user side water is the chiller water for building cooling flowing through evaporator.
The rating flow rate of chilled water pump is 47 m3/h, the testing flow rate of cooling water pump on ultrasonic flow rate meter is 36 m3/h.
The flow mode of cooling water(reclaimed water) belongs to internal flow inside tube, while the flow mode of chilled water belongs to external flow outside tube.
For plant 2, the fouling of the condenser and cooling tower should be entirely removed, and all kinds of function parameters of the compressor should be carefully checked and the motive parts of the compressor should also deeply maintained by professional staff.

Professional design, stable beam quality and effective transmission, safety and free maintenance. 2.
Accidents are avoided with the chain protection of water-air-light and the requirements of safety operation are achieved.
Integral cold water cooler satisfies the requirement of cooling water when laser continuous work 24 hours, meets the requirement of cooling water for processed machine, outer light path, the reflector of laser, and the output of window. 2.
It has special refrigeration control circuit, high precision temperature control and the real-time display function of water temperature, double temperature control, automatic high efficiency and low noise operation.
Low temperature water is supplied for cooling laser, which can ensure laser stability, efficient operation; Normal temperature water is supplied for cooling the entire outer light path optical element. 3.

As the largest ore slurry pipeline system,and the third iron concentrate slurry pipeline interiorly, include the longest water pipeline with only one pump station in China, Bayan Obo slurry pipeline engineering of Baotou has been operated.
It can transports 5.5 million tonnes of iron ore concentrate  and 2000 million m3/h of water per year.
Table 1 External diameter, Wall thickness, Length Type External diameter[mm] Wall thickness[mm] Length[Km] slurry f355.6 11.0~15.5 145.78 water f920 13.0~17.0 130.56 Table 2 Transport capacity(8000 hours operation per year) Type Every year[million ton] Every day [ton] Every hour [ton] Flow[m3/h] slurry 5.50 16500 687.5 509.9 water 20.00 60000 2500 2500 The earliest planning of this project was prepared in 2005, started in 2007.Well in 2008, formally began on April 12th.August 14, 2009 hydro test success,and on December 23, 2009 draw water went up into the high tank, pulp landed in January 4, 2010.
Fig. 4 Inside pressure curve of ore slurry pipeline Fig. 5 Inside pressure curve of water supply pipeline Fig. 6 Network diagram of pipe welding (miniutes) Fig. 7 Optimization of welding network pipeline down into the ditch Because there is no professional sideboom tractor, in order to put the pipe into the ditch, a method for specific construction with three sets of 50T crawler crane and 1 shovel was leaded in adoption by CSMCC.On this basis, a set of results are applied about the long distance pipeline large deformation theory and structural mechanics, construction scheme has been improved and adjusted by CEEC. 50T crawler crane increased to 4 sets, the shovel increased to 2 sets ,prescribed a limit to maximum hookon height and Minimum hoisting spacing.This newer scheme has better stability, higher security, faster speed ,the average speed reached 1 km every day.Show in fig. 8, and fig. 9.
The upper limit is 90 percent of the yield strength.The highest test pressure reach 28. 3 MPa, The test pressure of the special ellipsoidal head reach 34.5 MPa.According to the source of the water, The slurry pipeline is divided into seven section, the water piping is divided into five section, table 9 and table 10 gives the test pressure of each segment, when the testing runs, a blowout and a weld leakage appeared，then after the welding again,the second pressure testing was satisfied.Shows in fig.11 and fig.12.

These factors have an influence on the temperature balance of water objects.
Soil contamination by heavy metals is a threat to the plants, animals, surface and ground waters and human health [18,19].
After the concentration of heavy metals increased, due to the forest fire, they were then flushed by the storm and melt waters to the water objects.
The economical benefits of such methods consists of many factors; for instance, easy to use construction system with vegetation, absence of complex mechanisms for the water level or volume regulation, absence of any kind chemical reagents, and the fact that it could be operate without professional staff, etc.
The proposed method could be use in areas with a low level of the ground water allows recharging and increasing volumes of the underground waters due to the more effective infiltration system and localization of stormwater during rainfall.

Some experts also mentioned other possible factors leading to the instability, such as unfavorable geological structure, unfavorable deformation caused by the coal mining at the foot of the moutain, accumulated water in the mountaintop cracks, bad weather and oscillation brought by earthquakes, etc.
The experts from canadian professional department of geological survey presented the after-disaster topographic map and disaster-caused area, and restored the before-disaster topography by using the historical pictures and maps as reference [3].
There exists probably a bottom water pressure in the dynamic process of large-scale high-speed landslide.
When there is no bottom water pressue in the dynamic process, the apparent friction angle is the bottom kinetic friction angle, but when the bottom water pressure exists, the normal effective stress on the sliding plane will decrease, according to the Terzaghi theory, and then the friction resistance will also decrease as is shown in following equation: (5) Where is the friction resistance on the sliding plane, p is the water pressure, is the kinetic friction angle, and are respectively the total normal stress and the effective stress on the sliding plane.
On this basis, the study analyses the causes of the large-scale high-speed landslide and finds out that the high-speed motion of landslide, the high normal stress on the sliding plane and the water pressure can make the friction resistance decrease.

Zinc removal using Honey dew rind N.Othman*, A.S.Che-Azhar, A.Suhaimi Department of Water & Environmental Engineering, Faculty of Civil and Environmental Engineering, University Tun Hussein Onn, Beg Berkunci 101, 86400 BatuPahat, Johor, Malaysia norzila@uthm.edu.my Keywords: Biosorbent, biosorption, honeydew rind, zinc Abstract Heavy metals pollution in wastewater from agriculture and industrial waste has been a great concern due to their toxic condition and adverse effect to the environment and human life.
The rind then washed repeatedly with distilled water, soaked in 15% nitric acid (HNO3) for 24 hours before rinsing and soaking with distilled water for another 24 hours to remove the residual nitric acid on the honeydew rind.
References [1] Drinan, J.E. & Spellman F.R. (2013).Water and Wastewater Treatment: AGuide for the Non Engineering Professional. 2nd edition.
Progress in Polymer Science.Vol 30 pp 38-70 [6] Standard Method for the Examination of Water and Wastewater (1998). 22th. ed.
Washington: American Public Health Association, American Water Work Association and Water Environment Federation [7] Prabu, K., Shankarlal, S. and Natarajan, E. (2012).

Risks of maintenance technology of ETICS Professional approach to management and maintenance of ETICS, long-term monitoring of technical condition, documentation of maintenance, strategy of maintenance planning and prevention planning are absent.
Elimination of microorganisms by biocides, which is used in combination with subsequent washing of the cleaned surfaces with power water, 2.
Application of biocides, contaminated surface should be dry cleaned if needed or washed with pressurized water before application of biocides.
Protective methods and technologies eliminating biodegradation of building materials are besides other environmental problems (contamination of surface water when leaching, contamination of sewage water by chemical substances containing heavy metals) [5].
During the early rainy days after application of biocides (so called "First Washing") there is the greatest amount of biocides release into the water.

Alginates are powders that by mixing with water lead to the formation of a mould [4].
It depends on the water/powder ratio, mixing time and the time elapsed from gelling.
Alkaline alginates are water soluble (for example, magnesium alginate).
The fibers form a network and in its nodes water is retained.
It may, however, absorb an amount of water through imbibition phenomenon [15, 16].

of the water in the normal wind period,it transports the deposition of sediment at the far offshore to the nearshore so as to make it recovered and gradually deposited.Based on the above regularity and mechanism,measures can be taken like that,to fill a sediment barrier parallel to the shoreline,which can make the water carry more sediment to the nearshore so as to speed up the recovery at Silver Beach.The sediment can be got from Baihutou and Yingpan Town.
Silver Beach sediment transport simulation Simulation method.MIKE.is the product of the Danish institute of water resources and water environment.This software is currently the world’s leading software,which has been proven by practical engineering most times and has been widely accepted by the water resources researchers.
This issue adopts the method of MIKE21 model.MIKE21 is one of the four big software of MIKE,which is a professional engineering software packages of two-dimensional free surface flow simulation system.It’s mainly used in surface water flow,waves,water environment changes,sediment transport,etc of estuaries,rivers,sea,reservoirs and so on.The software includes two-dimension hydrodynamic model,the wave model,the water migration model,the rich nutrition model and the sediment transport model.MIKE21 incorporate GIS technology into itself so it’s convenient for data collection and processing.What’s more,it contains advanced numerical methods,special graphic tools and important regional variable subdivision mesh encryption calculation processing technology.The detailed introduction of MIKE21 see ref[5].
The sediment recovery mechanism of Silver Beach is that the dynamic action of the waters transport the sediment in the deposition area of the far-shore to the nearshore and then be deposited[6].
[5] Ting Xu:Water Conservancy Science and Technology and Economy Vol.16,No.8 p.867~869 In Chinese