Huge Cable Pull

[defears]

http://dl.dropbox.com/u/13765110/Scanned Document.jpg

Forgive the crude drawing. I don't remember how to quickly do this in CAD.

If you have the room try to stand the wire 6 or 8 feet straight up out of the 90. Let the tugger do the work.

 

[MD88]

Here's an update guys. As an engineer, Polywater gave me a free copy of their software. I ran through it with their technicians and the sidewall pressure is zero at the incoming 90 (that's to be expected) and with the Polywater J lube, the pulling tension is only a little over 1000 lbs! We're going to run a rag through first to clean it out, then run a lube bag, then pull the cable, with guys lubing it at the start and at each manhole. We'll also have a tension meter on it just in case things get out of hand. According to the Polywater guys, this kind of pull is nothing special... I think that's a big of an exaggeration, but I'm pretty confident that if we do the right steps, we'll be fine.

Thanks for all the input guys, and I'll give an update once we try it.

 

[don_resqcapt19]

Run the pull though the program the other way and see what the sidewall pressure is.

 

[lindstrom]

lindstrom

lindstrom

Remember two things:

1. The manufacturer will have maximum pulling tension allowed for their cable. If you go over that tension, you could damage the cable and void the warranty.

2. If you pull from the elbow end and it 6" PVC, there's a risk of the rope "burning" through the radius of the elbow. The cable could then be damaged as it passes by.

 

[Rockyd]

Seeings you have the "Poly-water" people there, you won't have to worry about the right lube. For all others, a person wants to make sure that the lube is rated for the wire! Not all lubes are designed for MV able....

 

[220/221]

Question gor all.


Do you need a special tugger to use a tension meter?

All I have ever used was a standard greenlee tugger with that wide pulley on it that you wrap the rope around a few times and you just "feel" the tension. The more wraps the more tension it will pull.

I don't see where a meter would go in that situation???

 

[Rockyd]

Greenlee has "tension meters that work for ultra tuggers - no problem.

See the link -

http://www.greenlee.com/cat_docs/Cable_Pulling09.pdf

page 152 shows the meter.

 

[220/221]

Ahh...you run the rope over a pulley with a sensor built in.

Thanks.

 

[don_resqcapt19]

Remember two things:

1. The manufacturer will have maximum pulling tension allowed for their cable. If you go over that tension, you could damage the cable and void the warranty. ...

It would be somewhat rare that the pulling tension is the limiting factor for a power cable pull. Most likely the sidewall pressure will be the limiting factor.