Discussion on new specifications for oil storage tanks
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Clause 6.1.2 of the new oil storage tank specifications stipulates that for storing Class A B liquids with a boiling point below 45 degrees Celsius or a saturated vapor pressure greater than 88 KPa, pressure tanks, low-pressure tanks, or low-temperature atmospheric-pressure tanks should be used. When pressure or low-pressure tanks are employed, measures must be taken to prevent air from entering the tanks, and the gases discharged from these tanks must be captured and treated in a sealed manner. 6.1.3 stipulates that for the storage of Class A A B and Class A B A liquid chemical products as well as light naphtha with a boiling point of not less than 45 degrees Celsius or a saturated vapor pressure of not more than 88 KPa, external floating roof tanks or internal floating roof tanks should be used. So here’s the question: For example, the low-pressure storage tanks currently in use at my facility (with a design pressure of 10 Kpa) need to be replaced with products that meet the requirements of clause 6.1.3. Can I choose to follow clause 6.1.2 instead? The materials specified in clause 6.1.2 are those with higher levels of hazard. Is it not acceptable for me to opt for a nitrogen seal along with measures for the sealed recovery of gases, rather than using an internal floating roof?
Will there be any problems if products that meet clause 6.1.3 are placed in containers that meet clause 6.1.2? The requirements of 6.1.2 should be higher than those of 6.1.3, right?
It’s more environmentally friendly, safety has improved – isn’t that good enough?
According to the definitions in the standards, there should be a gradual progression; the medium mentioned in clause 6.1.2 is clearly more hazardous than that in clause 6.1.3, at least in terms of flash point. For those media with high hazard levels in Item B of 6.1.2, it is recommended to use pressure vessels or low-pressure vessels, which should at least isolate air and recover oil vapors to ensure environmental safety. Clause 6.1.3 refers to media with slightly lower hazard levels, for which the use of floating roof tanks that are in communication with the atmosphere can be considered. So, if it’s a low-pressure storage tank, there’s no major issue with using the medium specified in 6.1.3; however, it’s better to install a nitrogen seal and an oil vapor recovery system for added safety
A low-pressure storage tank, according to the definition of oil depots, is one whose design pressure is greater than 6.9 Kpa; our design pressure is 10 Kpa, and the design follows API650 rather than API620. Is this considered a low-pressure storage tank?
Domestic standards do not use the concept of low-pressure tanks; instead, there are only vessels at normal pressure and under pressure. The term \"low pressure\" itself comes from foreign standards, with pressures ranging from 6 kPa to 100 kPa being considered low pressure
Are there any new regulations? Please share them
The book I bought has an electronic version of the approval draft available on Haichuan; it’s more or less the same
Personally, I think that no matter what the conditions on site are, it is essential to follow the existing regulations and standards. When changing the medium, follow the specifications for the new medium. This is because our national standards and regulations are also formulated by drawing on foreign standards and norms, along with statistics on different types of accidents.
@Still Youthful Travel: For gantry floating roofs, choosing nitrogen sealing combined with a sealed system is the best option. 1. An internal floating disk will surely reduce most of the volatilization. 2. In the winters of the north, having an internal floating disk is like having a low-temperature tank. After all, nitrogen also comes at a cost. Of course, it’s useless in South China.
If you use high-specification storage tanks to hold media that meet lower standards, the safety facilities should be sufficient; therefore, it is acceptable to use equipment that meets the requirements of 6.1.2 to store media specified in 6.1.3.