Lower Monumental Full Flow Project
From PTAGISWiki
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Synopsis
The objective of this project is to add PIT Tag detection to the Juvenile Bypass System at Lower Monumental Lock and Dam. The new antennas will be deployed upstream of the primary/secondary bypass switch gate.
Project Information
- General Contractor: Diversified Maintenance Systems. Salt Lake City, Utah.
- In Water Work Window: December 15th to March 15th 2007.
- FullFlow PIT-tag Detection System online: 3/19/07 at 2:00 PM PDT with antenna 01 operating. Antennas 02, 03 and 04 were put into operation on 3/22/07.
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Journal
During the course of the installation by the contractor, as every project goes, various issues come up and more often then not, there is a resolution that satisfies all parties of interest.
One of the key components of any PIT-tag system is the grounding scheme and power source. Early on in the construction phase of the project, the grounding loop was damage while concrete was being removed from the installation. The ground loop was eventually repaired using a 5000 psi crimp lug. PSMFC brought attention to this issue at the weekly coordination meeting and requested that at some point, a ground resistance test be performed to ensure that ground resistance is < 5 ohms. This request was not covered by the contract funds but the COE agreed that it would be prudent to do by whatever means. As of this date, the test has still not been performed although the COE has agreed to purchase the test equipment in order to perform the test themselves.
Prior to PSMFC starting the installation, the transport pipe was watered up in order to meet the in-water work window requirement. No testing of the PIT-tag system was possible prior to this.
PSMFC began installing PIT-tag equipment the week of March 14, 2007. The antenna configurations are standard with all previous full flow systems installed to date. The configuration is 2 individual windings ~ 9 wraps each, then wired in parallel with each other and in series with the reader.
Initial testing of the system with all 4 antennas active showed that the system was experiencing a “Beat Frequency” amongst all 4 antennas, or at least that’s what it appeared to be. After manipulating the grounds in many different configurations and an extensive evaluation of the antennas/shields/field clamps, the problem persisted, but the system was still detecting tags at a relative high rate.
As a test, we asked the site biologist to briefly cut off water to the transport flume to see what effects this had on the situation. When the pipe was completey dewatered the system was extremely stable and noise levels were below 5 percent.
On March 29th 07, NOAA performed a live fish test. The state of the system during this test was good but a little unstable. Stick test were performed prior to running live fish in order to obtain base line detection efficiencies. Various tag types were tested and the overall hits per tag and total tags detected were in the high 80’s to mid 90 percentile.
The obvious thing to do in order to circumvent the Beat Frequency problem was to synchronize all the transceivers with a master clock. This posed a problem in it’s self due to the distance between electronics shelter 1 and 2. After some research and testing, it was found that clock synchronization cable could be extended to great lengths by the use of a CAT-5E type cable rather than the factory sync cable supplied by the manufacturer.
On April 5th, PSMFC was back on-site to synchronize the transceivers. After synchronization was complete, the Beat Frequency was eliminated, but some mild interference was still being observed on the transceiver display. At this point, the random interference was thought to have been emanating from level transducers upstream of the installation but after further analysis, the transducers were not source of interference.
Summary
As of April 25, 2007, the slight residual noise that exists does not appear to be hindering PIT-tag detection. The daily detection efficiencies per antenna are at 99.9 percent or better and the efficiencies for the entire monitor are 100 percent. PTAGIS O&M will continue to be persistent in finding the source of interference or at minimum, research alternative methods of suppressing the interference.
Summary Document Including Efficiency Results
Lower Monumental Summary Document.doc
Noise Monitoring Evaluation Document
PTAGIS Field Operations 07/21/06 10:21 AM
The document describes the test outline along with data and other information collected during the evaluation.
Lower Monumental Full Flow Pit_Rev3.doc
Weekly Construction Meeting Minutes
06Feb07
- 1st antenna shield to arrive on-site.
- Still on track for the March 1st water-up
- Transport pipe ends are out of round and will require re-work to make them round for insertion into the pipe flanges.
- Feb.19th or 20th, Pipe supports arrive.
- PSMFC requests that the grounding grid be tested to ensure the grid is adaquate. Criteria for passing test is < 5 ohms of resistance.
20Feb07
- Shelter slabs were poured at the same 2 degree grade slope as the transport pipe. Looking for solutions in order to bring the slabs level. If not the shelters will be leaning.
- Shelters to be installed the week of March 5th.
- Electricial Contractor, Fusion Electric to begin electrical work on or around March 5th.
27Feb07
- Transport pipe repair begins this day.
- March 5th water-up schedule has been pushed back due to transport pipe problems.
- Electronics shelter delivery has been pushed back to March 15th.
- PSMFC to provide contractor information regarding the RF door gaskets for shields
27Feb07
- Electronic shelters due to be delivered on March 7th.
- Electricians currently on-site working on transformer power.
- Fiber Optics currently being installed.
- Broken earth ground loop has been repaired.
- PSMFC to provide information on how to perform the ground resistance test.
- PSMFC possibly could start installing equipment on March 12th.
16Mar07
- RF door gaskets due in on March 23rd.
- Conduit hubs for transciever enclosures will be installed when originally were ommitted.
- Apollo Sheet Metal to fabricate field clamps.
Meeting Minutes end. No further information to post.
Links
Pertinent links
