Asphalt pump failure and troubleshooting

Asphalt pump failure and troubleshooting, insulation pump for conveying medium temperature 350 ℃, the viscosity is not greater than 200mm2 / s, solid particles of asphalt, paraffin and other types of solidification at room temperature as well as the alpine region outdoor installation and technology The process requires insulation occasions.
First, the insulation pump, asphalt pump does not oil 1, the import and export valves are not open, out of the pipeline blockage, runner impeller blockage; check, go blockages.
2, the direction of motor movement is wrong, the motor phase loss, the number of revolutions is very slow; adjust the motor direction, tighten the motor wiring.
3, suction tube leaks; tighten the sealing surface, remove the air.
4, the pump is not filled with liquid, the pump cavity with air; open the pump cover or open the exhaust valve, exhaust air.
5, YHB gear lubrication pump inlet insufficient oil, suction stroke is too high, the end of the valve leakage; stop checking and adjustment (grid connection pipe and suction with the use of easy to use this phenomenon).
6, pipe resistance is too large, pump improper selection; reduce pipe corners, re-election pump Second, insulation pump, asphalt pump outlet pressure less than 1 liquid in the air; liquid air.
2. too low speed impeller damage; pump speed, replace the impeller.
3 outlet valve opening too large; small outlet valve.
Third, the insulation pump, asphalt pump flow less than 1, insulation pump impeller impeller blockage, grease deposition, valve opening insufficient; place plug, re-adjust the valve opening, pumps and pipes.
2, the number of revolutions is too low; increase the pump shaft revolutions.
3, impeller wear; replace the impeller.
4, the outlet valve opening too large; replace the impeller.
5, low voltage; regulator.
Fourth, asphalt pump motor heat 1. Ambient temperature is too high, motor cooling is poor 2. Motor load is too heavy. 3. The voltage is too high or too low or lack of phase. 4. The motor into the oil; check the mechanical part of the timely adjustment process, ZYB booster fuel pump regulator is the outlet valve so that the pump in the vicinity of the rated flow and lift work.
Fifth, insulation pump, asphalt pump oil leakage 1, mechanical seal wear; replacement.
2, the pump has sand holes or cracks; welding or replacement 3, the sealing surface is not smooth; trimming.
4, loose bolts; fastening.
Six, asphalt pump vibration or noise 1. Unit installation is not solid; pump flange should be reinforced at the bearing.
2. The suction pipe leak or suction pipe port submerged depth is not enough, so that the pump air intake; plug the air leak or lengthen the submerged depth of the suction tube.
3. Impeller cavitation; YCB arc gear pump to reduce the pump installation height or increase the suction pipe diameter or increase the inlet pressure, and replace the damaged impeller.
4. deviation from the operating conditions; as far as possible transferred to the high-efficiency zone (rated point) operation, to avoid the pump at large flow point operation.
Seven, heat pump and asphalt pump power is too large 1, more than the rated flow use; adjust the flow, off the small outlet valve.
2, Suction too high; reduce the installation surface.
3, bearing wear; replace the bearing.

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