Light oil sweep line problem

This is the original technical Q&A question, haha. Light oils are volatile. Use steam to sweep the line, and the oil will vaporize in large quantities to form explosive gas. The high-speed flow driven by steam can easily produce static sparks, so there is a risk of explosion when sweeping with steam. Most of the oil must be removed with water before sweeping with steam.

Light oil is easily volatile. When steam is used to purge, gasify and expand, the flow rate and pressure increase. Moreover, the increase in flow rate will generate static electricity. When swept into the tank, it will easily cause sudden boiling or vaporize other oil products together. I wonder what the consequences will be. It is like a rocket.* * It's the same as flying. hehe. And it is easy to explode under static electricity.

Same question---Is it feasible to use compressed air to clean the light diesel oil line?

1. For internal and external floating roof tanks, steam, wind, and nitrogen cannot be used to sweep the lines into the tank to prevent oil from being swept onto the floating boat and floating plate. If it is necessary to sweep the line, the oil level must be 0.5 meters lower than the pontoon before sweeping the line into the tank. The pressure of the sweeping medium must be strictly controlled to prevent the sweeping medium from impacting the pontoon, causing deformation of the floating plate and pressure inside the tank, and damaging the tank. Therefore, the sweeping line inside the floating roof tank should be kept separate from the inside and outside of the floating roof tank. 2. When cleaning heavy oil products, open the gauge opening and lighting hole of the cleaning tank before cleaning. Generally, steam is used to sweep the line. When the sweeping line enters the tank, usually the vertical pipe is used. After 5-10 minutes of seeing steam, it is considered to be clean and the steam should be stopped. Check again after 30 minutes. If no abnormality is found, the line cleaning operation is deemed to be completed. If there are any abnormalities, report them to the dispatcher and workshop in time and deal with them promptly. If you need to go down the bottom pipe, someone must be on site to monitor it. After the general clearance, you can change to the riser pipe. 3. When sweeping the line with light oil, open the gauge opening and lighting hole of the line sweeping tank. Do not sweep the line for too long. Stop contacting after 5-10 minutes of sweeping. 4. After the on-duty outside operator of a refinery sent the dirty oil to the device, he used the equipped 0.8 MPa nitrogen to purge the dirty oil line into the dirty oil tank. After 10 minutes, the outside operator found that the tank body had been deformed as a whole and the manhole had bulged. He then closed the purging nitrogen valve and the dirty oil tank was a normal pressure dome tank. The above is my understanding of line sweeping. Please correct me if I am inappropriate!

Mainly for safety reasons, liquefied petroleum gas and gasoline are volatile. When steam is purged, it flows at high speed in the pipeline, which will generate static electricity and form baozha at the purge outlet.* gas, causing safety accidents. The danger is much less after the water tops.