[TowerTalk] Poly rod, Fiber glass rod, Fiber Protrusion rod tension?

CEPitts cpitts at ec.rr.com
Sun May 13 20:44:58 EDT 2018

Question: For those that have used what is commonly referred to 
depending on discussion “poly rod”, “fiber glass rod”, “Fiber protrusion 
rod”, etc. in lieu of ehs or phillystran what is the recommended tension 
of said rod for 5/16” rod?

I have done quite amount of research both on line and contacting 
manufacturers and have found nothing that I can use for a reference or 
make any sense due to the engineering specs the manufacturers provide me.

I am not an engineer and cannot figure out what the recommendation would be.

I have my current tower project spec’d on ROHN 55G 130 mph at 130 feet 
100 % guying (130 feet) and it calls for the lower guys if using EHS 
spec ¼” at 665 lbs tension per guy and 5/16” at 1120 lbs tension per guy 
for the upper guys. (3 sets of guys, the two lower ¼”, the final upper 
at 5/16”)

If I am correct if I was using phillystran the tension would be the same 
based on the same equivalency of that material used to the EHS guy specs.

Since I am using this 5/16” “rod" on all three guy levels I want to make 
sure I do not under or over tension.

Rod provided was second hand (no issues, brand new) and was a great 
deal! I am all set to go up with tower but want to get this right before 
proceeding further. I have Loos gauges and Dynaometer at my disposal 
along with everything to get this project up as described above. Hope to 
get going when I get back from Dayton. From what I have determined so 
far it is best to tension everything up of course beginning with bottom 
set of guys to roughly 250 lbs + or -, get plumb and go from there with 
turnbuckle adjustment and get somewhere in the ball park of a safe and 
secure tension on final product as we go up to the final set of guys 
(#3) at 130 feet. 250 lbs is far off from 665 and 1120 but because of 
the material possibly those tension specs are not in the ball park of 
EHS or Phillystran? What say the group with any knowledge of using this 
type of guy material? When I get back from Dayton I am working on 
getting the tower up with a successful and safe out come? Thanks in 
advance , if you see me at the Crowne or the venue stop and say hi! 73! 

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