You are right, I don't have time to argue with you. I will have 82 more pump system problems to solve for people today. You can do a search on this forum and see how many times removing the above ground or second check valve solved the water hammer on pump start problem. I got over 200 to read when I did the search. Most of them read like this.
Removed the check valve near pressure tank and the pressure held steady, so there is no leak in the line to the pump. The water hammer is gone. Success!
https://terrylove.com/forums/index....and-water-hammer-at-cut-in.81238/#post-587263
I would much rather discuss transient pressure waves and hydro or thermal dynamics than get into chest thumping over who has the most experience, but OK.
I haven't pulled a pump for anyone else since 1998 when I sold my pump company. Prior to that I spent 30 years running up to a half dozen pulling units and 2-3 drill rigs at the same time, building and installing more than 2000 pumps a year. With that many rigs running I never got to see the normal 1HP pull and sets. All I got were the problems. Water hammer, repeated failures, fishing jobs, pumping salt water or hot water, pumping out of lakes or 2000' deep wells, lost circulation, or any other problem job was the one I got. While everyone else was doing the 1900 regular jobs, I got the 10o jobs a year that nobody else could figure out, which taught me a lot.
I had many mentors over the years, one of which actually wrote most of the AIM manual. However, all of them are dead and gone and I realized now I am the old man with more than 50 years experience. I went to my first pump school at Reda in 1973, and I had already been working on pumps for years. I have been the one teaching those classes for the last 25 years or so.
Now those 82 CSV's I sell everyday are to solve 82 pump system problems. No one ever calls me or gets a CSV unless they are already having problems. When pump guys suggested more check valves, extra pressure tanks, VFD's, or any of the other things that didn't solve their problem, they finally call me. The CSV really does cure most pump problems. It is the only product I know of that has been blacklisted by Goulds and several other pump companies for working too well. When I heard CSV's had been black listed for "making pumps last longer and using smaller tanks", I knew there was more to it than I could see. So I have spent the last 26 years figuring out all the reasons the CSV can solve so many pump system problems. I think that gives me more experience than just about anyone in the business.
And you are also right that if the bottom check is bad and needs replacing, the top checks were just masking the problem. Replacing or adding additional check valves will not solve the problem. I see it as adding a cast on your arm for a small scratch, not gonna help. Just make sure the bottom check is good and the pump doesn't cycle too much and you don't need anymore check valves to cause further problems down the road.
Now if you want to talk transient pressure waves and how to prevent them I am all for it. But if you want to just continue to insult me, we are done.