At the oil well site, explosion proof motors are used to drive the pumping unit. The job of a pumping unit is to pump crude oil from underground to the surface. Since there may be flammable and explosive gases such as oil vapor and natural gas around the oil well, the explosion-proof motor can effectively prevent the electric spark generated during the engine's operation from causing an explosion.
How to choose the suitable explosion proof motor in the oil industry.
1. Select the appropriate explosion-proof rating.
The degree of explosion risk varies significantly in different regions of the oil industry. According to the type, concentration, and frequency of combustible substances present in the workplace, the corresponding explosion-proof grade is selected. For example, in the crude oil distillation workshop with a high concentration of flammable gas accumulation, ExdⅡB T4 and above grade explosion-proof motors should be selected; Tank farms storing light oil products also require high levels of explosion protection to prevent any potential explosion risk.
You can refer to the table below to select the explosion-proof level.
| Explosive classification | Representative substance | |
| GB 3836, IEC 60079 | ||
| Ⅰ | Methane | |
| Ⅱ | ⅡA | propane |
| ⅡB | ethylene | |
| ⅡC | hydrogen | |
| acetylene | ||
| Ⅲ | ⅡA | combustible floc |
| ⅡB | non-conductive dust | |
| ⅡC | conductive dust | |
| Temperature class | The maximum surface temperature of the motor |
| T1 | 450℃ |
| T2 | 300℃ |
| T3 | 200℃ |
| T4 | 135℃ |
| T5 | 100℃ |
| T6 | 85℃ |
2. Choose the suitable protection of the explosion motor
The oil environment is complicated, in addition to the hidden danger of explosion, there are chemical corrosion, dust, water vapor, and other interfering factors. The explosion proof motor of the outdoor pump station should resist the invasion of rain wind and sand, and the protection level should be up to IP55 or even IP65 to prevent dust and moisture intrusion resulting in damage to the motor insulation; In the area of corrosive gas, the explosion proof motor shell material should have corrosion resistance.
3. Use adaptive power and speed
Different petroleum equipment has different requirements for explosion proof motor power and speed. When driving a large oil pump, it is necessary to accurately calculate the required power combined with pipeline parameters and crude oil viscosity to ensure sufficient power; The design speed of the pump body determines the explosion proof motor speed, and the improper matching between the two will easily lead to the damage of the pump body and the overload of the explosion proof motor, which will reduce the service life and operation efficiency of the equipment.
You can also choose the appropriate explosion proof motor parameters according to the following information.
In addition to choosing the appropriate explosion-proof grade, the appropriate power speed, and the protection grade, we should also pay attention to the daily maintenance of the explosion-proof motor to improve the service life of the explosion-proof motor.
How to maintain explosion proof motor
Under normal operation, explosion proof motor maintenance should include the following:
| 1.1 Keep the explosion proof motor and related equipment clean to prevent foreign matter from entering the motor. |
| 1.2 Regular measurement of winding, and bearing temperature, shall not exceed the limit. |
| 1.3 Periodically measure motor vibration and pay attention to motor noise and odor. |
| 1.4 Check the integrity of the lubrication system, cooling system, and testing system. |
| 1.5 Check existing electrical and mechanical connections to ensure normal operation. |
| 1.6 Monitor the motor current and do not exceed the rated value. |
| 1.7 Monitoring power supply voltage does not exceed the rated range. |
| 2. Winding maintenance |
| 2.1. Measure winding insulation resistance regularly. |
| 2.2 Keep the winding free of dust, oil, metal dust, and pollution |
| 3 . Oil change cycle The replacement of lubricating oil depends on the operating conditions of the sliding bearing: load, speed, running time, running temperature, etc., after the motor is put into operation, it is regularly inspected, and the results of the inspection will provide the correct information of the lubricating oil change cycle |
| 4 Maintenance of junction Boxes |
| 4.1 Check the tightness of the junction box to ensure that the protection level is intact. |
| 4.2 To clean and dry the junction box cavities, especially the insulators. |
| 4.3 To check whether the rubber seal is damaged, whether it loses elasticity, replace it if necessary |
If you want to know more about explosion-proof motors, please leave a message or contact me directly.
Nicole
Wechat/WhatApp:+8613011925239
Email: nicole@milestonemotor.com
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