Large API 650 cylindrical liquid-storage tank

Service Conditions and Hydrogen-induced Cracking
When the service conditions might include the presence of hydrogen sulfide or other conditions that may promote hydrogen-induced cracking effects, particularly near the bottom of the API 650 cylindrical liquid-storage tank shell at the shell-to-bottom connections, care shall be taken to ensure that the materials and details of construction of the tank are adequate to resist hydrogen- induced cracking. The Purchaser shall consider restricting the sulphur content of the material to be stored through thickness testing of the steel, laboratory surveillance tests, and the use of internal tank coatings to reduce the possibility of hydrogen-induced cracking.

The API 650 tank Standard has the built in flexibility to be used in building tanks to store a wide variety of products while ensuring the structural stability of the API 650 cylindrical liquid-storage tank tank.

The Indian customer purchased our A516 Gr 70 pressure vessel steel plates to make tanks. They have very strict requirement for raw materials quality. For the A516 Gr 70 pressure vessel steel plates, they asked for Normalizing, 0℃ impact, A578 UT test, PWHT and so on tests, our Q/C department witness the production process with the technician from the customer company together. Meanwhile, we arrange BV inspection to check the quantity, spray mark, stamp on the A516 Gr 70 pressure vessel steel plates, and so on.

Generally speaking, the duration of the "exhalation" of the API 650 cylindrical liquid-storage tank is longer than that of the "inhalation" of the API 650 cylindrical liquid-storage tank every day. There are many factors affecting the "small breathing" loss, mainly including the following points: the change of temperature difference between day and night, sunshine time of the API 650 cylindrical liquid-storage tank location, open area of the API 650 cylindrical liquid-storage tank, atmospheric pressure, filling degree of API 650 cylindrical liquid-storage tank, etc. When the API 650 cylindrical liquid-storage tank is full of gas, the space volume is small, and the "small breathing" loss is less; if the space volume is large, the loss is also large.

It is very important for a company to have a sound after-sales service system, which better guarantees the interests of customers and increases the reliability of the company's products in the hearts of customers. Our company has a dedicated after-sales service team and good after-sales service reputation, and has been recognized by customers over the past decades. Whenever there is problem about our API 650 cylindrical liquid-storage tank steel materials during application on the user site, our after-sales service persons will assist to find solutions at the first time.