I believe the terms "Flushing" and "Pumping" are interchangeable. As far as pure BB'ing goes, some studies have suggested that faster muscle recovery and growth is gains through exercising opposite muscle groups, as doing SS's, in a single workout. Usually thought of as for the tricep/bicep but SS's seem to work just as well with the larger muscle groups. The compound exercises and the push/pull effect when doing BB rows SS'ed with bench's for example work well. Legs SS'ed with leg biceps, ab's SS'ed with lower back, up-right rows SS'ed with overhead presses, etc, etc, etc.
If anyone wants a true 'Flushing" effect to bring a consent flow of nutrients (amino acids,growth hormones, etc) to feed muscle cells throughout the day, than they might try the one day arm program. Also been told it works very well for stubborn calves. Lot of Pro's and Con's on this but it could be worth an experiment. Just think of it as setting aside one whole training day to focus on gaining new arm size. The idea is to bring a light pump/flush into a area by exercising (triceps/biceps- one set only SS'ed) that area once an hour with a very light weight. Probably 7 to 9 times on one day. This style program is meant to be done only once in a while not as a regular workout. Do a search if you would want a total planned program for the all day protocol. Protein shakes and Creatine intake (all day)all day go along with the one day arm program.
I believe Pyramid training was to start with more reps (12 or more) and light weight. And than work up to the the heaviest (top of the Pyramid) weight/set (5 reps or so). Than work back down to the original light weight and reps (again...12 or more) used at the start. As up one side of a pyramid and down the other. This gives a great pump and affect most muscle fibers in a different way. Could take 3 or 4 sets, adding more weight each set, (or steps up the Pyramid) to get to the heaviest top weight for those 5 reps (or so). And than reduce the weight going back down (the steps) to the original reps/weight used.
Would do just one cycle of this style training. Heard it also called ladder training by a lot of athletes in their training. Good Luck.