Naipu WS dredging pump is single-stage single-suction cantilever horizontal centrifugal pump with advantages of light weight ,good wear-resistant ,super dredging performance ,perfectly suited for the dredge on the whole construction ,high multiple economy benefits and so on .It throughout meets requirements of the dredge to dredging pumps .The pump mainly consists of the pump head , gearbox specifically for the dredging pump ,high elastic coupling and supervisor system of the driving device for the dredge.
Sand Reclamation
WS Dredging Pump Construction Drawing
Main Part Number At The Drawing
Materials of Construction
VOLUTE
IMPELLERS
BASE
EXPELLER
EXPELLER RING
SHAFT SLEEVE
SEALS
Standard
High Chrome Alloy
High Chrome Alloy
Cast Iron
Chrome Alloy
Chrome Alloy
SG Iron
Natural Rubber
Options
SG Iron
SG Iron
Mild Steel
SG Iron
SG Iron
EN56C
Nordel
Dredging Slurry Pump,River Sand Dredging Pump,Submersible Dredging Pump,Horizontal Dredging Pump Shijiazhuang Naipu Pump Co., Ltd. , https://www.naipu-pump.com
Typical Applications---
Suction Hopper Dredging
Constructional Material
Sand gravel processing
Barge Loading
2 – Frame
3 – Mechanical Seal Assembly
4 – Connecting Plate
5 – Rear Liner
7 – Cover Plate
8 – Front Liner
9 – Impeller
10– Support
or
SG Iron
or
SG Iron
Fabricated
Ferralium
Hasteloy C
Ceramic
Stellite
Chrome Oxide
Neoprene
Viton
Butyl
EPDM
WS Dredging Pump Selection Chart
WS Dredging Pump Performance Parameters
Atmospheric pollution control refers to the six industries will impose special restrictions
**Abstract**
After more than half a month of daily air quality reports for several cities, the Ministry of Environmental Protection has introduced what it calls the "strictest" industrial policy aimed at combating air pollution. On the 19th, the ministry confirmed that it will focus on key control areas across 19 provinces, autonomous regions, and municipalities, including 47 prefecture-level cities and above. The new policy targets major polluting industries such as thermal power, steel, petrochemicals, cement, non-ferrous metals, and chemicals. It also includes stricter emission standards for both new and existing projects, particularly for coal-fired industrial boilers, thermal power plants, and petrochemical facilities.
During an executive meeting held on the 19th, Minister Zhou Shengxian emphasized that rapid industrialization and urbanization during the “Twelfth Five-Year Plan†period have led to increased pressure on the atmosphere. With rising vehicle ownership and coal consumption, severe air pollution is not only harming public health but also degrading the environment. To address this, the government must adopt strict environmental management measures.
An expert involved in drafting the policy stated that this is the most powerful air pollution control measure since the smog crisis last month. The policy introduces differentiated regulations based on regional conditions, with emission limits that are among the strictest in China’s history—some even reaching international standards. This approach reflects a shift toward more targeted and effective pollution control.
Chai Fahe, deputy dean of the Chinese Academy of Environmental Sciences, noted that the U.S. implemented similar strict air quality regulations under its Clean Air Act, setting regional emission standards that helped improve environmental conditions over time. In China, these special emission limits aim to prevent further deterioration of air quality and promote gradual improvement.
According to data from the Ministry of Environmental Protection, in 2011, industrial sources accounted for the majority of sulfur dioxide and nitrogen oxide emissions. Chai pointed out that industrial sources remain the primary contributor to air pollution, especially in terms of smoke and dust. Implementing these special emission limits, he said, is like "grasping the bull by the horns."
For new projects, starting March 1, 2013, thermal power and steel projects will be subject to stricter emission standards. Other sectors, including petrochemicals, cement, and coal-fired boiler projects, will follow once revised standards are in place. For existing projects, thermal power units in major cities will implement stricter soot limits by July 2014, while steel sintering equipment will follow suit from 2015. Existing petrochemical and coal-fired boiler projects will comply after transition periods.
Chai also highlighted that while these measures may increase pollution control costs for companies, the long-term health and economic benefits justify the investment. Currently, many of these costs are borne by the public and the government, rather than the polluters themselves. It's time to make companies internalize these external costs.
In the thermal power sector, for example, some regions currently allow sulfur dioxide levels up to 200 mg/m³, but the new special emission limit is set at 50 mg/m³—effectively tightening controls significantly.
Liu Zhiqiang, an engineer at the China Electricity Enterprise Association, noted that while technical solutions exist, the real challenge lies in balancing environmental goals with economic feasibility. He compared the effort needed to reach higher standards to the difficulty of improving from 80 to 100 points in an exam, which is far greater than moving from 60 to 80.
For the cement industry, the upcoming emission standards will introduce special limits for the first time. Kong Xiangzhong from the China Cement Association said that most companies will absorb the new costs, though some may need to close if they cannot adapt.
Finally, Chai warned that while some heavy polluters might move to less populated areas, the goal should be to reduce emissions through clean technologies and sustainable practices. This approach would benefit both heavily polluted regions and underdeveloped areas.
1 – Shaft
6 – Pump Casing