Design the pump outlet venting method
Thread Content
I would like to ask everyone: With a new transfer discharge pump, there is a problem after installation. The pump is used to transfer flammable liquids, and it is necessary to vent air before each transfer. This is because, between the tank truck and the pump, only a pressure difference exists; this pressure is not sufficient to force the material in the red pipe at the pump’s outlet past the check valve. Since there is N2 present in that red section, the pump cannot function properly once it is started. The current practice is to manually release air from the pressure gauge at the pump outlet. It was also considered to install an exhaust pipe at the pump outlet, but allowing air to escape directly through that pipe would result in liquid being discharged as well, which is not compliant with regulations. Do any of you have any good suggestions?
Installing an automatic exhaust valve can be considered; such a valve opens automatically to release air when air is present, and it closes the exhaust opening when liquid flows to the valve, thereby ensuring automatic air release from the system while preventing liquid leakage. A gas collection tank can also be installed to collect the emitted gases and a small amount of liquid, thereby meeting environmental and safety requirements. .
Add a bypass pipe at both ends of the check valve, install a valve, open it only to release air at the start of feeding before starting the pump; close the valve once normal operation is achieved. I’m not sure if this will work :)
This is good; the valves should be dual-valve
Add a bypass pipe with a valve at both ends of the check valve. We used this exact method before.
The poster said that the liquid being unloaded is a flammable liquid, and the feed pipe for such liquids should be a submersed pipe; however, when the liquid level in the tank is high, there is still a problem with exhaust not being possible