On the selection of materials for brine pipelines and their advantages and disadvantages
Thread Content
This post was last edited by sunjl1981 on 2013-1-6 at 20:45. The conventional design for chlor-alkali raw brine systems uses lined or composite pipes; can carbon steel pipes be used instead? Corrosion is limited, and iron ions do not affect subsequent processes, thereby reducing the amount of ferric chloride that needs to be added in those processes. I kindly ask all experts for their guidance. ， ， -
It is said that some factories do use carbon steel, and it doesn’t corrode. I think it’s possible that after operating for a while, calcium carbonate forms scale on the pipe walls, which acts as a protective layer. This might work in older saltwater processing methods, but I’m concerned it could still be a problem with newer methods. As a precaution, CS/PO is still the better choice
Saltwater is highly corrosive, and moreover, the use of carbon steel pipes will lead to an excess of iron ions in the saltwater, causing many problems in subsequent treatment. It is still recommended to use steel-reinforced plastic composite pipes, as they are easy to install, resistant to pressure and corrosion, and do not delaminate. They are already being used for saltwater transportation in many chlor-alkali plants; please consider this option.
It seems that our factory has been using rubber-lined carbon steel pipes all along. One drawback of these pipe sections is that they are highly sensitive to temperature variations; some pipes have become severely corroded. In particular, during startup and shutdown procedures, leaks occur to varying degrees at locations such as flange joints.
Thick carbon steel pipes can be used before entering the floating tank, but rubber-lined or other materials can be used after the Kay membrane. Previously, we used PO pipes, but they simply didn’t work. Now, we’ve switched to carbon steel pipes, which operate stably.
The most comprehensive and up-to-date information on anti-corrosion and wear-resistant piping technologies can be found at Henan Kaisheng Pipe Industry Co., Ltd. – the manufacturer of lined pipes, steel pipes with lining, piping fittings, and steel-lined pipes. Contact Manager Gao at 13838467263; website: http://www.hnksgy.com. Products include ultra-high molecular weight polyethylene piping series, steel belt polyethylene spiral corrugated piping for sewage disposal, polyethylene piping for water supply and drainage, anti-corrosion piping with rubber, plastic, or fluorine lining, piping floats for sand removal and dredging, as well as piping systems for oil wells, gas fields, coal mines, and oil transportation pipelines
Carbon steel pipes are not suitable; they caused leaks frequently over the course of three days of use, and there was no time to carry out repairs. . If possible, it is still recommended to use titanium tubes.
Over time, corrosion causes the alkali solution to turn red... which increases the costs of maintenance