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Contents:
Centrifugal Long Life pump shaft sleeves. Bossong Engineering manufactures a range of long life pump shaft sleeves to assist in the efficient running of pumps being used in the mining, mineral processing and power generation industries The cost associated with pump shaft sleeve wear forms a significant part of pump operating costs for the following reasons: 1)
Frequent packing adjustment to compensate for shaft sleeve wear.
Conventional methods of applying abrasion resistant surfaces to shaft sleeves are: metal
powder spraying, Bossong Engineering utilizes the plasma welding technique known as Plasma Transferred Arc or PTA. Pump shaft sleeves form one of the main production lines for our PTA systems. The PTA weld metal overlay process is used to produce long life pump shaft sleeves, shafts, plungers, wear plates and specific wear parts, along with various valve components. The high quality weld metal deposit achieved and the range of materials that can be used distinguishes this process from any other. The PTA process allows us to develop and apply our own metal alloys, metal carbides and inter-metallic materials. Fine spherical particles of tungsten carbide or other carbides and nickel alloy are injected into the plasma arc which is focused onto the surface of the sleeve. The arc produces temperatures up to 25,000 deg C, which causes the nickel alloy and the sleeve surface to fuse together creating a strong metallurgical bond. The surfaces of the carbide particles are also fused to the nickel alloy. The now fully integrated coating offers superior resistance to abrasion, corrosion and/or the thermal shock experienced by pump sleeves. This
has enabled us to provided metallurgical solutions for mineral
processing and refining equipment which is exposed to severe
combinations of erosion and corrosion. Trials conducted in highly abrasive areas of the Alumina processing industry have exceeded 5800 hrs. In Iron ore briquette production, shaft sleeve life has been improved tenfold over “metal sprayed sleeves”. Sleeves are manufactured to order from Carbon steel or 316 Stainless steel hollow bar. Our standard coating thickness is 1mm, but this can be varied to meet specific customer requirements. The advantages of sleeves produced by Bossong Engineering using the PTA process are as follows: Pump
sleeves have lasted more than 10 times the life of conventional sleeves.
Valve components can have greatly increased life span with the correct selection and application of PTA metal cladding. Materials can be selected to provide significant improvements in corrosion and abrasion resistance.Valves components can be produced for most standard valve configurations.
Positive displacement pump pistons and valves Positive displacement pistons can be refurbished or manufactured to provide extended life in corrosive and abrasive environments. A high quality surface finish is obtained from selected coatings, increasing the life of packing and seals. Fully welded coatings are resistant to delaminating failures, the common mode of failure in metal sprayed coatings. They provide increased resistance to high stress abrasion when compared with ceramic coatings. Non-return valves are PTA coated with materials that provide significant impact and abrasion resistance. PTA metal cladding provides improved life and reliability to positive displacement pumps.
PTA The PTA process is a welding process combining the advantages of plasma welding with powdered metal consumables. Corrosion and erosion resistant overlays of exceptional quality can be produced on a wide range of substances. Deposition rates as low as 0.3 Kg per hour can be applied to intricate components and up to 25 Kg per hour on heavy components, wear plates and pipes.
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