Search found 18 matches

by uulow98
Mon Jun 08, 2020 10:27 am
Forum: Near Surface Geophysics
Topic: Best GPR for underground utility locating
Replies: 7
Views: 721

Best GPR for underground utility locating

I searched the forum and did not see a topic like this. What's the best ground penetrating radar currently for locating underground pipes and cables? It's been while since last time I checked. I am seeing a lot of RD1500 now but I am not sure it's the best one in terms of the penetrating depth and r...
by uulow98
Wed Aug 06, 2014 5:30 pm
Forum: Near Surface Geophysics
Topic: Technology/Product advise for gold at 5 meter depth
Replies: 9
Views: 1445

Re: Technology/Product advise for gold at 5 meter depth

It looks difficult, maybe it is too deep for any technologies.
by uulow98
Mon Feb 20, 2012 3:03 pm
Forum: Near Surface Geophysics
Topic: How to differentiate pipes and cables in GPR radargram
Replies: 4
Views: 3924

Re: How to differentiate pipes and cables in GPR radargram

Some cables have metallic shields, I assume they will look the same as metallic conduits and pipes in GPR radargram? Can you tell the difference between a metallic pipe and a PVC pipe?
by uulow98
Tue Feb 14, 2012 6:15 pm
Forum: Near Surface Geophysics
Topic: Using GPR as slab leak detector
Replies: 7
Views: 4688

Re: Using GPR as slab leak detector

Considering the cost of slab leak repair, I don't whether it worths it to use GPR to find the leaks.
by uulow98
Mon Sep 20, 2010 5:25 pm
Forum: Near Surface Geophysics
Topic: Archaeological survey
Replies: 41
Views: 29659

Re: Archaeological survey

As a gift here you have my MASW 2D in 2 depth slices The task was: locate weak zones under the floor in the megastore due to collapsing hazard which occured in adjacent shops - the same building. Fields works: 13 parallel lines length 23m, 24 4,5Hz phones, hammer Sorry for quality - fastly made fro...
by uulow98
Sun Aug 29, 2010 8:02 pm
Forum: Near Surface Geophysics
Topic: Heating oil tank
Replies: 19
Views: 14769

Re: Heating oil tank

The tank could have been removed, whether it’s aboveground or underground. I have encountered many tank removal cases where tank associated pipes were left in place. I understand. There were no natural gas services for the house so I guess the tank was still used. I did not find the pipes leading t...
by uulow98
Mon Aug 23, 2010 9:45 am
Forum: Near Surface Geophysics
Topic: Heating oil tank
Replies: 19
Views: 14769

Re: Heating oil tank

So the taller one is the vent?
by uulow98
Sun Aug 22, 2010 11:32 am
Forum: Near Surface Geophysics
Topic: Heating oil tank
Replies: 19
Views: 14769

Re: Heating oil tank

tank pipes.JPG
tank pipes.JPG (16.75 KiB) Viewed 13992 times
Are these pipes for a buried heating oil tank?
by uulow98
Fri Jul 16, 2010 7:45 am
Forum: Near Surface Geophysics
Topic: Lost wells
Replies: 10
Views: 4720

Re: Lost wells

GPR is really a great tool to find everything underground!
by uulow98
Tue Mar 02, 2010 5:07 pm
Forum: Near Surface Geophysics
Topic: Subsurface utility locating
Replies: 10
Views: 6741

Re: Subsurface utility locating

Here is the link for the report: http://www.readingpa.gov/documents/Appendix%20E.pdf" onclick="window.open(this.href);return false;
by uulow98
Thu Feb 25, 2010 4:27 pm
Forum: Near Surface Geophysics
Topic: Subsurface utility locating
Replies: 10
Views: 6741

Re: Subsurface utility locating

I never used TW-6 or FX-3. I know sometimes I can't find some cast iron pipes with the pipe locators even I know they are there. Maybe in this kind of situations they could help?
by uulow98
Mon Feb 22, 2010 6:27 pm
Forum: Near Surface Geophysics
Topic: Subsurface utility locating
Replies: 10
Views: 6741

Re: Subsurface utility locating

I don't think they used every one of them to trace each pipe/cable. But I am sure it cost time to use all of them. I am wondering how many pipes they can find using TW-6 and FX-3.
by uulow98
Fri Feb 19, 2010 1:24 pm
Forum: Near Surface Geophysics
Topic: Subsurface utility locating
Replies: 10
Views: 6741

Subsurface utility locating

A geophysical consulting company did a job for underground utility locating. Beside the ground penetrating radar, they used many cable/pipe locators including a Fisher TW-6, a Fisher FX-3, a Radiodetection C.A.T. and a Radiodetection RD4000. Is it really necessary to use so many of them?
by uulow98
Mon Jan 18, 2010 8:37 pm
Forum: Near Surface Geophysics
Topic: PVC pipe locator
Replies: 13
Views: 36611

Re: PVC pipe locator

Common cable or pipe detectors/locators use electromagnetic (EM) signals to energize the pipe and use EM receivers to pick up the signals. So the pipes have to be made of metals such as steel, copper and cast iron, etc. But if you can put an acoustic signal on the PVC pipe, you can use a leak detect...
by uulow98
Tue Dec 29, 2009 4:37 pm
Forum: Near Surface Geophysics
Topic: Utility device causes bomb scare at Holladay strip mall (Utility locating)
Replies: 1
Views: 4013

Re: Utility device causes bomb scare at Holladay strip mall (Utility locating)

It must be the transmitter of a cable locator. I was always wondering someday this could happen. :D
by uulow98
Fri Sep 04, 2009 2:56 pm
Forum: Near Surface Geophysics
Topic: find buried fiber optic cables
Replies: 10
Views: 10030

Re: find buried fiber optic cables

I would mark "FiberOptic" or "FO" for fiber optic cables, they are really important and deserve designated marks.
by uulow98
Sat Aug 22, 2009 5:07 pm
Forum: Near Surface Geophysics
Topic: find buried fiber optic cables
Replies: 10
Views: 10030

Re: find buried fiber optic cables

As we all know, the cost of the damaging of live fiber optic cables is really high. They normally carry a very heavy load of communications. Finding their exact locations are very important. Unfortunately, they are hard to locate through ground scanning. They are not metallic, and the steel snake tr...