What are the maintenance precautions for oil arc gear pumps? Problems in pipeline drawing design

≪ One> What are the maintenance precautions for circular gear pumps

1. Check for any looseness in the stainless steel pump pipeline and joints. Rotate the circular gear pump by hand to see if it is flexible

2. Add bearing lubricating oil to the bearing body and observe that the oil level should be at the centerline of the oil mark. The lubricating oil should be replaced or replenished in a timely manner

3. Unscrew the water inlet plug of the circular gear pump body and inject water (or slurry)

4. Close the gate valve, outlet pressure gauge, and vacuum gauge of the water outlet pipeline

5. Inch the motor and check if the direction of rotation is correct

6. Start the motor, and when the arc gear pump is running normally, open the outlet pressure gauge and vacuum pump to see if they show appropriate pressure. Gradually open the gate valve and check the motor load condition

7. Try to control the flow rate and head of the circular arc gear pump within the range indicated on the label, and operate the circular arc gear pump at the rated point to achieve significant energy-saving effects

During the operation of the circular arc gear pump, the bearing temperature should not exceed the ambient temperature of 35C, and the high temperature should not exceed 80C

If any abnormal sound is found in the circular arc gear pump, it should be stopped immediately to check the cause

When stopping the use of the circular arc gear pump, first close the gate valve and pressure gauge, and then stop the motor

Within one month of operation, the circular arc gear pump needs to change the lubricating oil after 100 hours, and then every 500 hours. 12. Regularly adjust the packing gland to ensure that the leakage inside the packing chamber is normal (preferably in drops)

13. Regularly check the wear of the shaft sleeve, and replace it promptly if there is significant wear

14. When using the circular gear pump in the cold winter season, after parking, it is necessary to unscrew the drain plug at the bottom of the pump body to drain the medium completely. Prevent frost cracking

15. If the circular arc gear pump is not used for a long time, it is necessary to dismantle all the pumps, dry the water, apply grease to the rotating parts and joints, and properly store them

< II Problems in pipeline drawing design

1. Parameter design

The basis of petroleum equipment pipeline design is to understand the environment in which the pipeline belongs, in order to determine the temperature and pressure of the pipeline. The reason why this is called the foundation is because it is related to the selection of materials for petroleum equipment pipelines and the design requirements, as well as the design of pipelines and valves, and even to the subsequent work of pipeline and valve installation and inspection. In design, we often make mistakes in detecting the temperature and pressure of the environment where the pipeline belongs, resulting in improper temperature and pressure design, or forgetting to mark the temperature and pressure on the drawings due to carelessness. These seriously affect the normal progress of gear oil pump pipeline construction and the final quality of stone oil equipment pipeline construction. It is also crucial for the design parameters of pipelines and valves to be the same as those of petroleum gas storage stations. If the design parameters are different, it will lead to mismatch between pipelines and petroleum gas storage pipelines, resulting in air leakage

2. Material Selection for Pipes and Accessories

The material for gear pump pipes should be high-quality and seamless steel pipes, and the pipe fittings that match the pipes should also be made of high-quality carbon steel. Remember to avoid using cast iron materials.

. If it is a gas phase liquefaction pipeline with relatively low pressure, we will set it according to the "Urban Gas Design Specification"

3. Quality of process flow design

Every step in the pipeline design process should consider problems and prevent potential problems.

. For example, when designing pipelines for oil and gas storage stations, air valves are installed at the oil and gas transmission outlet to prevent pumping and backflow, while also taking into account the actual situation of thermal expansion and contraction inside the pipeline

4. Selection of installation and acceptance specifications

The standards that petroleum equipment pipelines should exceed in actual design specifications.

. All our processes should strictly follow the Construction and Acceptance Specification for Industrial Metal Management Engineering (UB50235-07), as this is the basic standard for gear oil pump pipelines