Question about pumping off a load

I did it myself few times, yep after arrival to customer first get at least 10-15 psi before start to pump with dome lid closed, MAKE SURE you supply enough air to keep stable air flow(mine was set up at 25psi) to tank.
After you empty turn pump off, and only then realse air from tank.

 

I've done this many times, Everythings the same as a regular pump off but your charging the tank with air instead of venting.
Are you using customers air? or off your truck. If the latter make sure your truck can run your pump and compressor at the same time. Keep an eye on the air gauge to make sure the air is keeping up.
Use any blow off fittings you have just for releasing any air pressure
that might get trapped in your hoses.
Close your internal valve when done first that'll help ridding pressure off your hoses.
I'd try to get 20-25psi

 

Done it many times. You can run air to the trailer while pumping. You wouldn't need to add alot of air to keep it from impoding. Just act like you're doing and air unload and make sure you have your blow off valves. It will be a change in routine for you, so be mindful of that when you finish the offload and begin to disconnect you're lines

 

I've unloaded latex/glue Numerous times except customers pump, my air. I've built air to 20-22 psi, then start their pump.

 

@BFL123 How'd it go?

 

Don't listen to that one,LoL
You can do it with nitrogen, Never air