Maintenance methods and preheating temperature of steel lined plastic storage tanks

The main function of steel lined plastic storage tanks is to utilize the special properties of their materials to achieve the purpose of storing and transporting corrosive media. With the continuous progress of society, people's awareness of health is also constantly improving. However, in many industries, chemical substances exist for a long time. In order to ensure that the environment is not polluted and personnel are not harmed, it is necessary to ensure the safe storage of chemical corrosive substances.

Maintenance methods for steel lined plastic storage tanks

Generally, the service life of steel lined plastic storage tanks is relatively long. Long term use of steel lined plastic storage tanks can lead to corrosion and leakage. If not cleaned and inspected regularly, the steel lined plastic reaction kettle is prone to major accidents. The cleanliness of oil tanks affects the quality of oil products, and the health condition of the tanks threatens the safety of the surrounding environment and the oil tank area. Keep the interior of the steel lined plastic reactor clean and reduce oil pollution. At the same time, once the metal of the steel lined plastic storage tank corrodes and punctures, there will be a large amount of oil leakage, causing economic waste and environmental damage, and even posing a risk of fire. Therefore, it is necessary to inspect the bottom of the tank once a year to determine whether cleaning is necessary.

The maintenance cycle of steel lined plastic storage tanks is divided into two types: medium maintenance and major maintenance. Medium maintenance usually takes 2-4 months, while major maintenance usually takes one year. For medium maintenance, it is to clean or replace the liquid level gauge, repair or replace the inlet, outlet and drain valves, clear and clean the cooling water coil. Check and repair the safety valve vent flame arrester, repair the anti-corrosion layer and insulation layer. Major repairs include repairing the internal components of the storage tank as part of a medium repair project. If cracks or severe corrosion are found, corresponding repairs or replacement of the cylinder section will be carried out. According to the internal and external inspection requirements, and after repairing or replacing the cylinder joint, leakage testing is required to address other issues found during the internal and external inspection of the storage tank.

The steel lined plastic storage tank is lined with environmentally friendly, non-toxic, odorless, and corrosion-resistant plastic. It uses a rolling molding process and is formed in one go. It has the characteristics of good integrity, high strength, no welds, no leakage, impact resistance, good toughness, light weight, long service life, acid and alkali resistance, organic solvent resistance, compliance with hygiene standards, low price, and multiple specifications and varieties.

The preheating temperature during welding of steel lined plastic storage tanks should be determined based on the chemical composition of the steel grade and the structural stiffness. The higher the carbon content of the steel grade, the more other alloying elements there are, and the greater the working stiffness, the higher the preheating temperature required. Welding sequence. The same welding performance materials and welding specifications, if the welding sequence is different, the tendency to produce hot cracks will also be different. The reason is that different welding sequences result in different welding stresses. Reasonable welding sequence should be adopted to minimize welding stress to the greatest extent possible.