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Blocked Conduit - Need to See in 3/4" Conduit - Fibre optic Camera?

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Blocked Conduit - Need to See in 3/4" Conduit - Fibre optic Camera? Scott Townsend 09-26-2006
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Posted by Scott Townsend on September 26, 2006, 1:58 pm
Thanks for the Suggestions. We were thinking about putting Air/Water in the
conduit to see if we could locate it.

Thanks,
Scott<-=
> Scott Townsend wrote:
>
>> I have a 3/4" Conduit that seems to be blocked at the end. We can kind of
>> hear the Fish tape tink at then stopping point, though we don't know
>> where it is... We don't know how to locate the end of the conduit. We
>> were thinking if we could see the end, it might help us determine the
>> location. It is about 6'-8' to the end of the conduit. I've tried looking
>> for Small Cameras, but nothing that will really fit in the Conduit.
>> Found a bunch of Borescopes, though they are too expensive.
>>
>> It would be great to get something like this:
>> http://www.accessweb.it/en/optical_fibres/fo1.htm Though 97cm is too
>> short.
>>
>> Any Suggestions on how to see to the end or find the end?
>>
>> Thanks!
>>
>>
>>
> Trick we have used on water pipes:
> Take a carry tank and connect hose to conduit.
> Blow 100 psi air thru and search for the "whistle"
> at the other end.
>
> Alternate: pump Mercaptan in with the compressed air and
> locate by smell.
>
> Jim
>



Posted by dpb on September 26, 2006, 2:03 pm

Scott Townsend wrote:
> Thanks for the Suggestions. We were thinking about putting Air/Water in the
> conduit to see if we could locate it.

Air good, water bad...

Who pulled the conduit?


Posted by Scott Townsend on September 26, 2006, 2:13 pm
Its been installed in the Driveway pillars for years. That whole planning
for the future thing. Just now getting to it.

Thanks,
>
> Scott Townsend wrote:
>> Thanks for the Suggestions. We were thinking about putting Air/Water in
>> the
>> conduit to see if we could locate it.
>
> Air good, water bad...
>
> Who pulled the conduit?
>
>



Posted by dpb on September 26, 2006, 2:37 pm

Scott Townsend wrote:
> Its been installed in the Driveway pillars for years. That whole planning
> for the future thing. Just now getting to it.
>
Just noticed a mention of the lights in an earlier post I hadn't
previously seen--are they already there or is there an indication where
they're to go? Starting from the other end might lead somewhere? Not
being able to see the situation makes more really specific ideas
difficult. Is the distance the tape is going near the end point that
you could actually be hitting the box cover? If it's way short,
perhaps the conduit just terminates? All kinds of possibilities rear
their head not knowing what actually have...

At this point if I was adamant to get something working I'd probably do
something similar to the other suggestion of essentially starting from
scratch from the end of the run, knowing at some point I'd have to find
the existing run coming back....


Posted by Pete C. on September 26, 2006, 6:02 pm
Scott Townsend wrote:
>
> I have a 3/4" Conduit that seems to be blocked at the end. We can kind of
> hear the Fish tape tink at then stopping point, though we don't know where
> it is... We don't know how to locate the end of the conduit. We were
> thinking if we could see the end, it might help us determine the location.
> It is about 6'-8' to the end of the conduit. I've tried looking for Small
> Cameras, but nothing that will really fit in the Conduit. Found a bunch of
> Borescopes, though they are too expensive.
>
> It would be great to get something like this:
> http://www.accessweb.it/en/optical_fibres/fo1.htm Though 97cm is too
> short.
>
> Any Suggestions on how to see to the end or find the end?
>
> Thanks!

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=93765

Cheapest thing out there (ready to go), but at 7/8" too big for 3/4"
conduit. Plenty of smaller mini cams out there though the small dia ones
don't have internal LED lighting so you'd have to rig something. One of
the 1/2" dia mini cams paired with some 1/8" plastic fiber optic cable
and a light source mounted behind the cam could work. Attach the whole
thing to the end of the fish tape and push it in.

Check distance to blockage from each end with the fish tape to see if
it's a small blockage or a big problem like a section crushed by a
loaded cement truck.

If you think it's just a rock or bit of cement, attach a pointed chisel
to the end of the fish tape and see if you can bash through it.

Pete C.

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