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Handling pump bearings and seals that are not resistant to wear and heat

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(1) Presenting the problem: the shaft violates the high oscillation; shortens the life of the mechanical seal; noise occurs together.
Treatment method: use the impeller mouth ring of polyimide carbon fiber composite material to cooperate with the stainless steel pump casing ring; replace the original graphite bushing with the throat bushing of our data.
Results: Reduced oscillation fluctuations; then extended the life of the seal and the service life of the bearing; enhanced the pump's free operation. Many pumps use packing as a filler in the application; the primary effect of the packing is to prevent leakage; But also the effect of the bearing; stability axis. Many pumps have now changed the packing to mechanical seal; followed by the transformation of the mechanical seal; the bearing has no effect; and the axis violation (high oscillation and associated effects) has become a problem.
Improve the pump with polyimide carbon fiber composite data; successfully deal with the customer's problems; the first two points are:
1) Polyimide carbon fiber composite material is a metal-free wear and non-bite material. This reduces the working space (as long as half of the gap between the metal materials of the API rule); the bush with smaller gap can stabilize the axis; Small gaps in the mouth can further limit the leakage and leakage speed.
2) Polyimide carbon fiber composite material is a kind of high-strength, high-performance thermoplastic material. It is easy to inject; it can absorb oscillation and impact; in the replaced metal, it will cause oscillation and shaft wear. Parts: Match The problem with the movable seal bushing and the Teflon bearing (2) is that the support bearing is severely worn. The factory tried a lot of different materials such as carbon, graphite, and filled Teflon data; trying to find a suitable one to deal with wear. And the problem of shaft violation; all materials are scrapped within 2 to 3 months. During this period, the products of PTFE raw materials cause wear of the shaft due to wear; great leakage occurs; mechanical seal failure occurs. Treatment method: using polyimide The carbon fiber composite material replaces the filler-filled PTFE bearing. The result: the polyimide carbon fiber composite material supports the bearing device; it has been successfully operated for more than 13 months; the eighth month after the application; the middle part of the mixer is Removed and temporarily used other equipment; at that time; the operator detected the agitator bearing; found that the leakage per inch per side was less than 0. 005; Engraved advances by 300% to 400%.
(3) Presenting the problem: the pump is made of stainless steel and stainless steel with a hard outer casing as the ring and bushing. Generally speaking, the dry running of the pump is due to the reduction of the suction volume during the operation; the first some dry rotation The situation often leads to premature damage to the pump; the metal parts are also greatly damaged. The uniformity of these pumps is only six months. The treatment method: replace the stainless steel impeller port with polyimide carbon fiber composite material. Rings and bushings; operating gaps are reduced by about 50%. Results: Pumps improved with polyimide carbon fiber composite data have been used for more than a year now. Some bad conditions have been present during the operation; The pump is not working; however, the renewal of the polyimide carbon fiber composite data has now delayed this appearance. In addition, the customer also issued a statement: the modification was carried out by using polyimide carbon fiber composite materials; the operation gap was reduced; The output flow of the pump has increased by 400gpm; the other two multistage pumps have also been updated. (4) Presenting the problem: violent oscillation; low pump power treatment: using poly The imine carbon fiber composite material was used as the pump casing ring and bushing. The working gap was reduced from API specification to 0. 0115 inches per inch of conversion. Result: 0. 600 inches / sec. oscillation; improved oscillation 0. 094 inches / sec The power is promoted by 5%. Oscillation: The reason for the decrease in oscillation is as follows: 1) Recycling activity and its effect on rotor instability are reduced; 2) void reduction. 3; 3) Natural thermoplastic data has easy injection molding function Absorbing sensation or impact. Power: The power improvement is due to the reduction of the gap between the pump casing and the impeller ring. The gap here will in turn reduce internal recirculation. Reliability: This pump is now in operation More than four years later; the refinery has now used polyimide carbon fiber composite materials on more than ten pumps. The advantages and use of polyimide carbon fiber composite data for anti-abrasive data: a. Excellent wear resistance. It is superior to rubber, bronze, carbon graphite and other materials in the case of abrasive particles. b. Widely used in bushings in sewage pumps, sea water pumps (working environment is sand and other abrasive particles); line pump bearings and bowl wear rings. c. Only referrals are used as fixed parts (because of the temperature constraints of the data). d. Compared with other non-metallic materials; anti-abrasive composite materials have better chemical resistance. e. Compared with rubber bushings and other metal materials; polyimide carbon fiber composite data has a very low coefficient of friction.

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