Any good suggestions?
Set of 10 drain rods Ł15 for a weekend. can't be far off 1m each so two
(anti-spam is as easy as 1-2-3 - not)
130 metres? Blimey. A Jack Russell and a rabbit?
Compressed air is probably the way to go, but you will need a vast air
I calculate volume as 0.2 cubic metres or 7 cubic feet. You need a
compressor that can dump several times that quickly.
Begs the question why a draw rope wasn't inserted as it was laid.
No! Only bad suggestions:
Flood tunnel and use a wire atatched to the tail of a fish.
Radio controlled car with wireless camera so you can stop if you get to a
Firework rocket with fine wire
Big magnet on surface to pull a metal weight along (you need one of the Acme
brand magnets that doesn't obey the inverse square law).
Collect tent poles from the abandoned junk after a rainy pop festival and
use them to push through.
Actually a toy car isn't such a bad idea. Any jumble sale should get you a
few old Rc cars - and some have caterpillar tracks. The RC bit isn't needed.
You could probably waterproof one well enough to handle water once, and if
it fails drag it back out. (making sure your draw wire is strong enough!)
Going back a good few years, I've seen paddies using a tennis ball with a
length of string attached, blown through with the output from a road
breaker type of compressor.
the dot wanderer at tesco dot net
|!On 27 Mar 2007 07:41:03 -0700, Ricardo wrote:
|!> I need to get a draw wire through a 130m of buried duct its 140mm
|!> internal dia, it does have slight smoothe bends nothing serious, So
|!> far compressed air and a carrier bag has been pondered as too has a
|!> radio controlled car the latter of the two I am reluctant to try due
|!> to possible rain water sitting in the bottom.
|!Going back a good few years, I've seen paddies using a tennis ball with a
|!length of string attached, blown through with the output from a road
|!breaker type of compressor.
When you get it in leave it there, you always need it again
Dave Fawthrop <sf hyphenologist.co.uk> 165 *Free* SF ebooks.
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I'm sure you can get longer ones, a quick ring round the hire shops
should sort you out. I've used duct rods for runs with some reasonably
fierce bends and they've flown though.
Somebody asked almost the same question here about a year ago, and
spawned a long discussion which may be useful:
Are there no mid points on the run for access? That's a long run.
I tend to use a dedicated utility sized snake that comes on a metal reel
when I'm doing cabling between manholes in the street.
No it's an absolutely terrible idea that may require digging up several
areas of the ground and opening the pipe to discover where the radio
controlled car has blocked it. RC signals don't pass through damp earth
too well anyway.
Underground cable ducting does flood, it also fills with grit and other
Big huge nylon feed-wire is a good choice. The compressed air system
and "rabbit" is commonly used by some utilities. But they tend to use
their jack-hammer compressor.
That's the one... It's amazing how well it goes through ducts.
I've got an offcut of one, about 20-25m long, that I have for long
runs on trays, above ceilings etc. It's flaming lethal, you have to
unwind it gently then run when it starts to let go and try and lay
itself out flat! You wouldn't think it was that dangerous after using
one that comes on the reel as it just rolls on and off easy as
Sounds like a job for a ferret to me :-)
Instead of compressed air - how about a vacuum cleaner and a carrier bag
(attached to fishing line)
I know this work really well for smaller ducts, and I have done it several
times, but on your run and bore, you might need a "super Hoover" to make it
Or if the run is down hill, then you could attach a tennis ball to a line,
then squirt water down. to push it through
BT/NTL etc have a fiberglass rod on a reel, but I doubt that it would be
130m long as they usually have pits in the road/pavement a lot closer than
that - might be worth asking your friendly BT employee when you see one.
Tie/tape a line to a rat's tail, it will probably end up the other end,
A large-ish firework rocket with the stick removed may well work, but I
guess you would need the first meter or so of line to be metal, or it would
probably burn/melt!..preferably one that doesn't end with a large BANG - one
of the screamers would be best I guess
>BT/NTL etc have a fiberglass rod on a reel, but I doubt that it would be
>130m long as they usually have pits in the road/pavement a lot closer than
>that - might be worth asking your friendly BT employee when you see one.
You didn't read any of the other replies then.
You're comment about the rolls that BT use not being 130m because they
are closer, what does that mean, I can't work it out.
Similar to this? A bit pricey for a 1 off job but they must be
available for hire somewhere.
Of course it was a terrible idea - but the blocking of the RC signal is
irrelevant because you don't need to control the car - you just lock it into
forward and I did say that you needed a strong enough draw wire to drag it
> I know this work really well for smaller ducts, and I have done it
> several times, but on your run and bore, you might need a "super
> Hoover" to make it work!
Using vacuum you're restricted to atmospheric pressure - at very best. No
such restriction with compressed air. If you've got a vacuum which blows
as well as sucks, the blow part will be more efficient.
*If at first you do succeed, try not to look too astonished.
Dave Plowman da...@davenoise.co.uk London SW
To e-mail, change noise into sound.
Borrowing from 2 of my immediate neighbours would get me 45m of drain
Regards, Paul Herber, Sandrila Ltd.
Electronics for Visio http://www.electronics.sandrila.co.uk/
>In message <4609a61a$0$759$bed6...@news.gradwell.net>, Sparks
>>BT/NTL etc have a fiberglass rod on a reel, but I doubt that it would
>>be 130m long as they usually have pits in the road/pavement a lot
>>closer than that - might be worth asking your friendly BT employee when
>>you see one.
>Similar to this? A bit pricey for a 1 off job but they must be
>available for hire somewhere.
Am I in everyones killfile or something? I posted a link to a hire
shop with a duct rod in it the other day and no-one seems to have read
If there is a problem with some of my posts not showing please let me
You posted "the right answer", hence the silence :-)
Hmm, I'll have to stop doing that then.
That's alright then, I'll put it down to people not being fully up to
speed with how to read a thread\click links etc....
There are many who read an o/p's post and reply without any reference to
the rest of the thread, leading to many diverging non-solutions. I'm sure the
o/ps reads all the posts so will see the useful stuff. That said, many o/ps
don't acknowledge helpful posts.
Rest assured, you're on the white list in my newsreader (even if your
current solution is 10m short of the o/p's requirement) :-D
Plusnet - I hope you like vanilla
>Rest assured, you're on the white list in my newsreader (even if your
>current solution is 10m short of the o/p's requirement) :-D
Ssssh, I was hoping no-one would mention that bit too much.
But, longer ones are available, I just didn't see any the other day.
I believe this may be one, but a picture would be handy.
I think the above link is the the cobra half way down the page here,
but not sure, a phone call may be in order.
Or even this one from Brandon, looks a good price too. Not so many
Brandon tool hire places though as Speedy's or HSS's
>Hungry Ferret at one end .. bunny rabbit at 't other!..
Ferret and compressed air.
I can even supply the ferret
(evil, bitey smelly little bastard that it is).
> Ssssh, I was hoping no-one would mention that bit too much.
> But, longer ones are available, I just didn't see any the other day.
There must be a limit of how far you can push a flexible rod? We've got
cable TV here and they seem to work on more like 100 yards max.
*Why is the time of day with the slowest traffic called rush hour?
It's not going to be easy, we normally install a pulling pit every 50-75 metres,
plus one each side of a bend. If you have any bends in your 130m run, you're in
deep trouble & blowing it through may be the only option, assuming the conduit
is still reasonably clean (they never are)
If you can't be a good example, then you'll just have to be a horrible warning.'
If, and it is a >BIG IF<, you can arrange a large water tank at the
head end of the run, and can let water quickly disperse at the tail
end, rather than use an air compressor you could tie a stout cord
through a suitable sized ball, and wash it down with a rapid pulse of
water. This assumes there is a fall of course.