What is the harm of overcurrent to high temperature hot oil

40. What is the harm of overcurrent to high temperature hot oil pump?

A: The rated current is the current that the motor normally works under the rated voltage and rated power. If the rated current exceeds the rated current, the motor is easy to overheat and the relay protection device acts to stop the pump. If the relay protection device does not act or does not work well, it is easy to burn the motor and damage the pump.

38. What are the main performance parameters of the pump?

Answer: mainly include: flow, head, Napo allowance, speed, power and efficiency and other contents.

 

39. Why do we need to turn over the spare equipment regularly?

What should be paid attention to when turning a car?

Answer: 1) for the standby equipment regularly turning, one is to check whether the operation of the equipment is flexible, there is no jam phenomenon;

The second is to prevent the bearing from bending and deformation, and really play a backup role.

2) when turning the car should pay attention to: one is the stop position of the rotor after turning the car and the original position into 180 degrees Angle;

The second is to throw oil lubrication of the machine pump should be fed oil, rear plate car, in order to prevent damage to bearings.

41. What are the main contents of the pump inspection?

Answer: 1) Check whether the indicating value of the pressure gauge and ammeter is in the specified area and remains stable;

2) Check whether the operation sound is normal and whether there is noise;

3) Whether the temperature of bearings and motors is normal (no more than 60 degrees);

4) Check whether the cooling water is smooth, whether the packing pump and mechanical seal leak, such as whether the leak is within the allowable range;

5) Check whether the connecting part is tight and whether the anchor bolt is loose;

6) Check whether the lubrication is good and the oil level is normal;

 

42. What should the plant operator do when the maintenance personnel arrive for maintenance?

Answer: 1) check whether the maintenance work ticket is consistent with the actual bit number of the equipment to be repaired;

2) Contact the duty monitor to find the area electrician for power failure;

3) Provide equipment damage and specific parts to maintenance personnel;

4) Cooperate with on-site maintenance and supervise maintenance quality;

5) After the maintenance is completed, contact power transmission and test run;

6) After the operation is normal, report to the monitor on duty and keep records.

 

43. What is the function of the inlet and outlet valves of RY hot oil pump?

Answer: 1) The pump inlet valve is a part that is isolated or cut off from the slurry pump and the system during maintenance. It cannot be used to adjust the flow and should be fully open;

2) The outlet valve is the part that adjusts the flow and separates the pump from the system and cuts off the pump when it is opened or shut down for maintenance.

 

44 chemical production pump according to what selection of seal?

Answer: according to the process conditions and working pressure, medium corrosion status of rotation speed selection.

 

45. What are the types of flat pad seals?

A: 1) Non-metallic gasket seal;

2) Non-metal and metal composite gasket seal;

3) metal gasket seal.

 

46. What are the main causes of gasket leakage?

A :1) leakage caused by design;

A. Improper selection of flange and flange sealing surface;

B Improper selection of gaskets;

C. Improper selection of flange and bolt materials;

2) Leakage caused by manufacturing, installation and operation;

A The machining accuracy of flange and gasket does not meet the technical requirements;

B. Improper operation when tightening bolts causes gasket deviation;

C Flange sealing face clean, there are impurities.

 

47. What is a mechanical seal?

Answer: mechanical seal is also called the end seal, is by at least a pair of vertical rotation axis of the end face, under the action of fluid pressure and compensation mechanism, so that the two end face closely fit, and the relative sliding and constitute a device to prevent fluid leakage.

 

48. What are the commonly used seal forms of the pump?

A: There are two kinds, dynamic seal and static seal.