Thanks
i`m sorry it is 30-40 mm not 40cm, 40cm is a huge displacment and makesa big force,and its totaly wrong.

without loop,it comes about 70 cm but my desined loop take its disp. ,
now it only has about 40 mm=4 cm,and not in the nozzle side, in the end of the line, but i dont know what`s the next tie in,and how connect to it,(with or without leg)
so i assumed it`s fixed there(wrost case)
and in my wrost case (expansion) it pass all the stesses and all the disp,
the only thing is matter that 4cm and its axial force,
also it passed all other thingsinother cases (stress,disp,force,...)


and the code is b31.3, i will check te code for max allow. axialforce,
i hope i find it,if not i must check my university books,"

i think the weld on the support is important and i must check it and the next way is to let line freely expand without any axial support.

i checked the site before posting but i didn`t find my answer
thanks again