My water pipe can't hold pressure at the fittings!

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barapt

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I had to replace a 8 m old water pipe 1'' (was made from galvanized steel and started to rust from inside), so I decided to use some 2 pipes of 4m pp 1''1/4'' (40mm) made of pp and I used to join them:
1 compression fitting pp 1''1/4'' x 1''1/4''
2 compression fitting pp fe 1''1/4' x 1''1/4'
both my elbows ends where I join my pipe are 1'' so I used some reductions!
(you will see them in the pictures)
Now, I'm quite sure that all the compression fittings were mounted and sealed like in the instructions, but the problem is that my pipe can't hold the water pressure on the fittings, when I start the water, my pipe start to bend sightly and the water start to leak on the fittings and after short my pipe just bounce out from fitting ( i also try'ed to hold the pipes straight and turn the pressure max low from the valve, no success).
What I'm doing wrong ? And what pipes/fittings should I use? Here are the pictures to have a better idea:
 
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Valveman

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Those compression fittings with the blue Ferrell nuts are suppose to have grippers for whichever type of pipe you are using. On poly pipe they should have a 3 grove gripper that gets tight into the pipe when you tighten the nut. These hold pretty good when you get the nuts tight enough. However, compression fittings on flexible pipe suck. They work best on rigid pipe with thrust blocks, so pressure can't push the pipe out of the compression fitting. Any compression fitting without the grippers will not work unless you chain or cable the pipes from coming apart. I don't know how many compression fittings on well heads I have seen with a chain and boomer holding it together.

The best thing for poly is butt fused weld. Maybe you can rent a butt fuse welder and weld some threaded ends on that pipe.
 

Smooky

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It might hold with some barbed fittings. They should fit tight. You should have to heat the pipe to insert the fitting. Then use clamps to hold it together.
one inch galvanized barbed fitting.jpg
one inch hose mender.jpg
 
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