Hello everyone, I'm new to pumping and just recently got hired on. I was just taught today to prime a Z frame wide open and full throttle with some slick pack. Ive work around pressure before and this seems counter intuitive since less time to react if there is a plug. 

How do you Z framers prime? Any input would be greatly appreciated.

It can be done but you gotta know your concrete and your machine. I'm not a fan of slick pack myself but I know other operators like using betonite for priming.

even on Z booms I prime A framed , then go into Z , you can prime in Z and you sometimes can get a pig back in Z , but I prefer priming and sucking back A framed.

I have had to prime with boom laid down in bldg with system attached and not known ahead that would be required, if caugh where I'm unsure I will put clean out ball in  and use it to keep prime from separating.  I usually don't even use slick pac but that's just me. I have nothing. Against slick pac and have had times I had wished I had used one LOL.

I run a Concord 38 Z. I prime in both Z And A depending on the room I have. When its Z real close to the truck so sections are almost straight up and down. For A I like to be 30 feet from the truck so 1 and 2 are as up as possible and 3 and 4 are down. Both of these i fill my prime port with water. Inside a building when boom has to be flatter I use a slick pack mixed with 5 or 6 gallons and dump into prime port. Always 3/4 volume and full engine RPM. Not to say its always a 100% but most of the time no problems. 

PM 32 or 36 I always prime in Z. Just keep sections close...almost straight up and down. I only use water in the hopper(hate slick pack), but that's just me. Full rpm and like between a third and half your max pump speed.