If I were you I would remove the repeat and instead make a new event for the growth and another one for the spawning of the pipe or simply add it in the growth event.
You can do this by adding a variable to the Pipe_tubing called "Length" or something.
Then you make an event like so:
Every 0.1 second
Pipe_tubing.Length < 100
For each Pipe_tubing
----Add 2 to Pipe_tubing.Length
----Set Pipe_tubing.Height = Pipe_tubing.Height + 2
----If (Pipe_tubing.length = 100)
-------- Spawn Pipe_pump