How to clean the inner wall of black steel seamless pipe

Posted by chase Liu on April 6th, 2023

Seamless black steel pipe is uncoated steel, also known as black steel pipe. The dark color comes from iron oxides that form on its surface during the manufacturing process. When steel pipe is forged, a black oxide scale forms on its surface, giving it the finish seen on this type of pipe. During the production process of black steel seamless pipe, there will be oil stains, scale produced by welding and some other dirt. The outer wall is easier to clean: if it is oily, you can use organic solvents or lye to wash it; if it is rusty, use a special rust remover. But how to clean the inner wall thoroughly?

The mainstay of black steel seamless pipe is octg pipe that delivers propane or natural gas to residential and commercial buildings. The pipe has no seams making it a better pipe for carrying gas. Black steel seamless pipe is also used in fire sprinkler systems because it is more fire resistant than galvanized pipe.

Cleaning method

1) Ultrasonic cleaning

If the cleanliness requirements are high, use ultrasonic cleaning. The drastic change in the sound pressure when the ultrasonic waves propagate in the liquid causes the liquid to undergo a strong air phenomenon, generating millions of tiny cavitation bubbles per second. Under the action of sound pressure, these bubbles are rapidly produced in large quantities, and continue to explode violently, generating strong impact and negative pressure suction, which is enough to quickly peel off stubborn dirt.

2) Ultrasonic vibrating plate

If the steel pipe is relatively long and you have a sink, you can buy an ultrasonic vibrating plate and put it into the water for ultrasonic cleaning. If it is not too long, you can use an ultrasonic vibrating rod to insert it into the pipe for cleaning, and then wash away the dirt stripped by ultrasonic waves with running water.