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What should I do if the pump bearings and seals are not resistant to wear and heat?
Source: China Bearing Network Time: 2018-02-04
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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: using 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 in 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 injection; it can absorb oscillation and impact; in the replaced metal, it will cause oscillation and shaft wear.
Parts: with movable seal bushings and Teflon bearings (2) presents a problem: the support bearings are severely worn. The factory tried a lot of different materials such as carbon, graphite, filled Teflon data; attempt to find a suitable To deal with the problem of wear and shaft violation; all materials are scrapped within 2 to 3 months. During this period, the product of PTFE raw materials wears the shaft due to wear; great leakage occurs; mechanical seal failure occurs.
Treatment method: replace the originally used filler PTFE bearing with polyimide carbon fiber composite material.
Result: Polyimide carbon fiber composite data support bearing device; has been successfully operated for more than 13 months; 8 months after application; the middle part of the agitator was removed and temporarily used for other equipment; then; operator inspection The agitator bearing; found that the leakage per inch per inch is less than 0. 005; at this moment, the intermittent error has improved 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 pump damage; metal parts are also greatly damaged. The uniformity of these pumps is only six months.
Treatment method: replace the stainless steel impeller ring and bushing with polyimide carbon fiber composite data; the operating clearance is reduced by about 50%.
Results: Pumps improved with polyimide carbon fiber composite materials have been used for more than a year now. Some bad conditions have been presented during the operation; the voids are dry; the pump is not working; but after the polyimide The carbon fiber composite data update has now delayed this appearance. In addition, the customer also issued a statement: it was modified by the use of polyimide carbon fiber composite materials; the operating gap was reduced; the pump output flow has increased by 400gpm; The other two multistage pumps were updated.
(4) Presenting the problem: violent oscillation; low pump power treatment method: using polyimide carbon fiber composite data as the pump casing ring and bushing. The working gap is reduced from API specification to 0. 0115 inches per inch.
Result: Start oscillation 0. 600 inches / sec; improved oscillation 0. 094 inches / sec; power promotion 5%.
Oscillation: The reason for the decrease in oscillation is as follows:
1) Recycling activity and its effect on rotor instability.
2) The void is reduced.
3) Natural thermoplastic materials have easy injection molding function; absorb 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: The pump has been in operation for more than four years; is the refinery now available? Polyimide carbon fiber composite materials are used on more than ten pumps.
Advantages and use of anti-abrasive materials for polyimide carbon fiber composite materials:
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 sewage pump, sea water pump (working environment is sand and other abrasive particles) bushing; pipeline pump bearing and bowl wear ring.
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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