nazwa klienta: Sulfer-mine

DESCRIPTION OF THE PROBLEM
The subject matter of the regeneration and protection included a vacuum pump of the PR-75 type, produced in 1992. The said pump transports hydrogen sulfide with water. Due to highly aggressive properties of the pumped medium, the body of the pump made of reinforced concrete undergoes a constant degradation. The three-year-long period of the utilization of the equipment in such an environment resulted in a necessity to take it out and replace it with a new pump or regenerate and protect the surface of the body and rotor with the material resistant to abrasion and hydrogen sulfide.

DESCRIPTION OF THE REPAIR
All elements of the pump (the body and rotor) were subject to a double sanding. Thus there was removed the whole layer damaged by the hydrogen sulfide and the surface was prepared (made rough) for the placement of the regeneration material. Then, elements of the pump were defattened with Chester Fast Cleaner. After the defattening material evaporated, all lacks were filled in and leveled in the parent material with Chester Metal Super SL. The long time of the hardening of the material allowed the renovation team level the regenerated surfaces very carefully (lacks up to 5mm). Then three layers (ca. 1mm) of Chester Metal Ceramic FSL were placed all over the whole surface of the pump to finally protect elements of the equipment against the abrasion and the aggressive effect of hydrogen sulfide.

ACHIEVED EFFECTS
The pump was repaired in two days. The total cost of the renovation amounted to 10% of a purchase of a new pump of this type. After one-year-long utilization of the equipment repaired according to Chester's technology, the pump showed lacks in the material leading to the necessity to take it out for renovation. The plant plans to regenerate and protect all vacuum pumps of the PR-75 type gradually and successively with materials of Chester Molecular.