Internal floating roof API standard 650 duplex stainless steel tanks

Fixed roof API 650 oil storage tank includes inner floating roof tank, which API standard 650 duplex stainless steel tanks can effectively prevent sand, rain, snow or dust from polluting the storage liquid. Under various weather conditions, API 650 oil storage tank can ensure the quality of liquid storage, which is called "all-weather API standard 650 duplex stainless steel tanks storage tank".

Prefabrication requirements of large vertical API standard 650 duplex stainless steel tanks accessories: the prefabrication shall be deepened as far as possible in strict accordance with the requirements of construction drawings and specifications, according to the principle of convenient installation and construction, as much as possible to reduce the installation workload, especially the workload of high-altitude operation. The prefabricated accessories shall be strictly inspected to ensure the quality and make marks. In addition, effective measures should be taken to prevent deformation, damage and corrosion during storage, transportation and stacking on site.

Preheat Treatment
Many laboratory tests have shown preheat treatment of carbon steel to 300°F-400°F to be the equivalent of the post-heat treatment at no less than 1100°F insofar as the physical properties of the weldment are concerned.40,41 Some tests have indicated a slight advantage of the post-heat treatment. Most of the tests have been made on plates 3/4 in. - 1 in. thick; results must be viewed with caution if preheating is applied appreciably beyond this thickness range. However, for all practical purposes, improvement resulting from preheating is sufficiently well established so that preheat should be considered for field fabrication of API 620 crude oil tank plates over 3/4-in. thick whenever toughness of the tank API standard 650 duplex stainless steel tanks is highly desired and the thermal post-heat treatment is impractical.

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