Why cannot mixed carbon 5 be stored in atmospheric-pressure tanks
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I would like to ask the experts: The pump pressure at the delivery end is 1.0 Mpa; the fluid is transported through pressure pipes to a storage tank at atmospheric pressure. The main component of this fluid is mixed carbon 5, with pentane being the primary component. Why do the safety assessment agencies say that a pressure storage tank is necessary, and that a atmospheric-pressure storage tank won’t do?
This post was last edited by Qian Hui on 2022-12-9 at 10:20
Atmospheric pressure storage tanks are not under pressure; your mixed C5 material tends to evaporate and vaporize easily. Such tanks usually come equipped with breather valves – aren’t you concerned about explosions?
This post was last edited by Qian Hui on 2022-12-9 at 15:20. Measures such as cooling tanks or low-pressure tanks, as well as fire arresters installed after the breathing valve, may be employed; for more details, refer to the tank area design codes and fire protection design codes.
For large tanks constructed in accordance with GB 50341-2014 \"Code for Design of Vertical Cylindrical Welded Steel Oil Tanks\", the maximum design pressure is 18 kPa; however, the saturated vapor pressure of C5 at 40°C already exceeds this maximum design pressure； Moreover, storage tanks for media that are prone to vaporization due to environmental influences are generally equipped with water spray cooling systems to prevent overpressure.
The spherical tanks we use for C5 – I guess it’s because these atmospheric-pressure tanks tend to vaporize easily
Using an Excel program, the P (saturation vapor pressure) in MPa (absolute pressure) at 37.8°C was calculated: n-pentane, 0.107； Isopentane, 0.141 ； Cyclopentane, 0.068. Meets the requirements of the “SHT 3007-2014 Standards for the Design of Storage Areas in Petrochemical Processing and Transportation Systems”. 4.2.4 Storage of methane with a boiling point below 45°C or a saturated vapor pressure greater than 88 kPa at 37.8°C. For liquid-like substances, pressure storage tanks, low-pressure storage tanks, or atmospheric-pressure storage tanks with cooling should be used……