[TowerTalk] [Bulk] Re: Phillystran

[Roger (K8RI) on TT]

This should not be a factor where the Phillystran is used as a truss at 
a fraction of its strength.  As guy lines the standard "Big Grip is 
recommended.  They haven't used Spelter sockets and epoxy for some 
years  even on the larger 6,000# cable.

For a truss 3 saddle clamps are used with the saddle on the live side 
(never saddle a dead horse) so creep has never been a problem when used 
on a truss.  The Big Grips (Recommended by Phillystran and sold by 
vendors) grip entirely on the jacket, but it's over about 18" or more.  
If you wrote a recent article recommending Spelter sockets, it is not 
what the manufacturer recommends, hence they have not been the proper 
method of termination for a number of years.  I don't know when they 
changed, but it was Big Grips in 2002, or 13 years ago when I installed 
my 45G using Phillystran's recommendations.  I didn't find any sellers 
of Phillystran even offering Spelter sockets.

Follow the "Prime Directive"

73

Roger (K8RI)


On 10/21/2015 11:35 PM, Grant Saviers wrote:
> I strongly advise against saddle clamps.  The problem is creep of the 
> plastic jacket causes the clamp force to decay with time. Until the 
> clamp completely cuts through the jacket the clamp force decays.  At 
> room temperature it took about 3 weeks and at least 4 tightenings to 
> get the saddle to cut through the jacket.  I used a torque wrench to 
> set the tightening force and measured the residual torque at a late 
> time each cycle.  I built a tension tester and verified saddle 
> terminations will slip well below the breaking strength of the 
> Philly.  Even after 121 days and 4 tightening cycles the saddle clamp 
> torque values indicated continuing creep and reduced termination 
> strength.  I was unable to achieve more than 30% of the break strength 
> of the Philly. (25000# Philly and 7000# load for slippage).
>
> Later I tested the proper terminations for this Philly (Spelter 
> sockets with epoxy) on a commercial 100,000# tension test stand and 
> the guy failed at 28000# tension and not the termination. See NCJ 
> Nov-Dec 2014 for my article.
>
> I've seen bent booms as a result of using saddle clamps.  I also found 
> them loose on my steppIR 4L after a year on the 1200 size so will 
> never use it again.
>
> Phillystran says use grips on all 2100 and larger.  Follow the 
> directions!
>
> Grant KZ1W
>
> On 10/21/2015 13:06 PM, Mike Reublin NF4L wrote:
>> Mostly what compresses is the jacket. No strength is lost. My SteppIR 
>> uses Phillystran (as a bridle) with small saddle clamps. The PS is 
>> very flat in the clamps.
>> 73, Mike NF4L
>>
>>
>>> On Oct 21, 2015, at 3:46 PM, GMuller885--- via TowerTalk 
>>> <towertalk at contesting.com> wrote:
>>>
>>> All:
>>>       Thank all of you for the input.    Based on all the input my 
>>> guys and
>>> stays are of Phillystran 6mm dia 2100 lbs  break strength. I am 
>>> using guy
>>> line clamp kits, three to a  connection.  The only question left is 
>>> that if
>>> the Guy cliompress  the Phillystran how much strength is lost if any?
>>>
>>> Gerald Muller K9GEM
>>> GMuller885 at aol.com
>>> _______________________________________________
>>>
>>>
>>>
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-- 

73

Roger (K8RI)


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