tailieunhanh - Hydroblasting and Coating of Steel Structures Episode 4

Tham khảo tài liệu 'hydroblasting and coating of steel structures episode 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 48 Hydroblasting and Coating of Steel Structures Table Recommended water Alter sizes Kauw 1992 . Operating pressure in MPa Recommended filter size in pan 100 100-200 200 100 10 Manufacturer recommendation Table Recommended water quality for plunger pumps and drinking water quality WOMA Apparatebau GmbH Duisburg . Parameter element Permissible value Drinking water analysis1 Temperature pH-value Hardness Fe Mn Cl KMnO so4 Cl Solved oxygen Abrasive particles Conductivity 30 C Depends on carbon hardness 3-30 mg 1 mg 1 100 mg 1 12 mg 1 100 mg 1 mg I min. 5 mg 1 5 mg l 1000 pS cm 10-14 c mg I mg 1 48-58 mg 1 140-205 mg 1 700-900 pS cm 1 Water works Duisburg. 2 . German hardness. centrifugal booster pumps that are part of commercial hydroblasting systems. For some pump types header tanks located on a higher level than the suction pipe are sufficient. In order to achieve optimum and reliable pump performance pump manufacturers recommend drinking water quality. SSPC-SP 12 NACE No. 5 states the following The cleaner the water the longer the service life of the waterjetting equipment. More detailed requirements are listed in Table . General structure of High-Pressure Pumps Subdivision and basic components High-pressure pumps generate the operating pressure and supply water to the spraying device. Generally they can be divided into positive displacement pumps and hydraulic intensifiers. Positive displacement pumps are standard for hydroblasting applications. In Germany almost 90 of all on-site devices are driven by positive displacement pumps. The most common form is a triplex three plunger pump as shown in Fig. . Major parts of a positive displacement pump are crank-shaft pump head with low-pressure inlet valves and high-pressure outlet valves high-pressure plunger conversion set Hydroblasting Equipment 49 Figure Solid content in water and maintenance cost for plunger pumps Reliance .