Another question regarding the transfer of propylene oxide (PO) from tank trucks to atmospheric pressure dome tanks
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Is it necessary for the tanks and troughs workshop to be connected by gas lines? Some expert could please explain in detail the connection relationship among tank trucks, pumps, and tanks, as well as the purposes of these connections. Thanks
First of all, I want to clarify that I’m not an expert: lol. 1. When unloading PO (including all liquid materials transported in tank trucks), a metal hose is usually used to connect the tank truck to the unloading pump; the specific connection methods include quick connectors and flange connections, among others； A fixed pipeline is used to connect the unloading pump to the storage tank. 2. When unloading from a tank truck, the installation position of the unloading pump is usually such that its inlet is below the outlet of the tank truck’s tank, creating a height difference that facilitates the proper operation of centrifugal-type unloading pumps. 3. The materials to be unloaded are pumped into the storage tank, thereby completing the process of unloading the raw materials. 4. The gas connection pipe between the tank and the tank truck is necessary because, during unloading, as the liquid level in the tank rises, the pressure in its gas space increases, resulting in large-scale breathing. Without this connection pipe, the nitrogen used for sealing the tank would be discharged in large quantities through the breathing valve, leading to waste of nitrogen, environmental pollution, and certain safety risks ； The gas that passes through the gas-connected pipeline is directly discharged into the tank of the tank truck, which not only helps to achieve pressure balance but also ensures that a slight positive pressure exists inside the tank for safety purposes. For reference!
Do all propylene oxide (PO) tank trucks have vapor lines? I haven’t seen it, so I’d like to ask: handshake
I don’t know if all tank trucks have vapor equilibrium line interfaces; what if the diameters of different tank trucks vary?
For Building 2: It is best to use dry quick connectors for connection to the vehicle
The boiling point of propylene oxide at 101 kPa is 34.24°C, and its vapor pressure at 25°C is 75.86 kPa. Due to its high volatility and toxicity, it must be transported in specialized tank trucks. It can be loaded and unloaded using liquefied gas flexible hoses.
It is advisable to use a slurry-circulating canned pump for the unloading pump; during unloading, cyclopropane evaporates, and the tail pipe of the canned pump can be connected to the tank to prevent bubbles from causing damage. It is best to have such a gas line in place. Since different tank truck interfaces vary, it is advisable to use several pumps with different diameters to accommodate various types of tank trucks.