Regarding the selection of a discharge pump or discharge compressor for automotive tank trucks?
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1. When unloading vehicles, how should one decide whether to use an unloading pump or an unloading compressor? I’ve seen before that liquefied hydrocarbons can be handled using unloading pumps, but are there also cases where unloading compressors are used? 2. Why do extremely highly hazardous media require top-loading and unloading?
1. The choice between a unloading pump or a unloading compressor depends on the physical state of the medium being transported and the required method of unloading it. For liquids, unloading pumps are generally used, while for gases or volatile liquefied gases such as LPG and liquid ammonia, unloading compressors are typically employed. When selecting the appropriate equipment, factors such as the properties of the medium, safety, cost-effectiveness, and efficiency must be taken into account. 2. Top-loading is required for extremely hazardous media mainly for safety reasons. Top loading and unloading can reduce the risk of medium leakage during these processes, especially for volatile and toxic substances. By using top loading and unloading, gas leaks can be controlled more effectively, thereby protecting the safety of workers and the environment. .
1. What to use depends on whether a suitable pump can be found. 2. Where does it come from?
This pump will work, and the compressor will work too
This post was last edited by ice2008 on 2024-1-15 17:18. Thank you for your replies!
What are the advantages and disadvantages of pumps and compressors? For example, in terms of cost, pumps are cheaper while compressors are more expensive； But in terms of effectiveness? Can LPG be unloaded using sliding vane pumps and similar devices now?
A few things I encountered and saw at work to share: 1. Recently, when unloading coal powder, a tank truck for transporting powders was used, which was equipped with a compressor. The compressor was not started during loading; it will be needed once it arrives at the cement plant. Ash discharge from the top; it appears to be a Roots blower with a pressure of 0.2 Mpa and a flow rate of 12.5 m3/min. It is equipped with a safety valve, but no calibration seal was seen. An external air source can be connected, though no connectors were found. The maximum pressure limit is 0.25 Mpa. 2. The diesel tank truck comes equipped with a discharge pump; our diesel tanks are buried, and by connecting the discharge pipe, dumping the contents is possible. Anti-static bridging wires must be installed on the flanges of the inlet and outlet pipes. 3. For ammonia tank trucks, there is no onboard pump; a discharge pump is installed outside the tank enclosure. 4. For hydrogen fluoride, sulfuric acid, and liquid alkali tank trucks, some have onboard pumps while others do not. Tanks are all built at a lower level by utilizing the height difference of the platform, with unloading taking place at a higher level. Summary: When conditions permit, make use of gravity-fed unloading as much as possible; since the pressure is low, the risk of leakage is relatively low. For frequent high-level unloading, considering installing a dedicated unloading pump and connecting it to compressed air pipes is an option.
The pump cannot empty it completely; a truck unloading compressor is needed
Should I use a pump or a compressor for unloading butadiene?
This post was last edited by ice2008 on 2024-7-16 at 10:38. Previous projects used either pumps or compressors; centrifugal pumps were used before, but they seemed to not be very effective. As a result, some owners suggested using dump compressors. In fact, other pumps with self-priming functionality should work just as well.