Steam boiler piping

Bill Root

It is my opinion that the piping shown in this photo was not installed as designed and recommended by boiler manufacturers and is the cause of condensate carryover from one boiler to the adjacent standby boiler. I believe it has to do with steam transport theory and the piping patterns have major influence to control the carry over. Installing contractor disagrees with me. So I said I'd ask around. Any of you have opinions or experience with this? Design was to have traditional piping pattern as published by boiler manufactuters. Boilers shown are 2001 Hurst 4 pass fire tube boilers. When one boiler fires condensate carrys from the firing boiler to the stand by boiler, through main header.Standby boiler then floods and can not fire as backup. It is recognized that main header has incorrect piping connection from boilers to it, entering side of header instead of top. A large trap was installed between the two boiler connections to catch condensate, but does not seem to be effective in resolving the problem.
Would appreciate any input or pointing me in direction of literature that describes recommended piping practice and reasons for such.