A06_Salient_Characteristics_-_Density_Meter.docx
DOCX document 23 KB Posted
- Attached to
- DENSITY METER Federal contract opportunity
- Solicitation number
- 140G0125Q0083
About this file
This salient characteristics document outlines requirements for one density meter and associated transmitter needed by the US Geological Survey's Grand Canyon Monitoring and Research Center in Flagstaff, AZ. The equipment will be used for measuring suspended-sediment concentration (SSC) in water, building on previous research including recent promising work by the Concessionary of the Rhone River in France.
The required density meter must provide real-time flow and density measurements for pumped slurry and water with computer output capabilities, feature a ¾-inch measurement tube diameter, liquid flow accuracy of ≤0.1%, liquid density accuracy of ≤0.005 g/cm³, and stainless steel construction. The associated RFQ (140G0125Q0083) will be issued around March 7, 2025, with quotes due March 13, 2025 and anticipated award date of March 17, 2025. The procurement falls under NAICS code 334513 with a size standard of 750 employees. Delivery is required within 21 days after receipt of order.
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Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| Sol_140G0125Q0083_Amd_0001.pdf | ||
| B08_Attachment__2_-_Questions_and_Answers_0001.docx | DOCX document | |
| Sol_140G0125Q0083.pdf |
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Text version
Scope of Work
PROJECT BACKGROUND AND DESCRIPTION STATEMENT
This is a request for the purchase of one (1) density meter and (1) associated transmitter.
Suspended-sediment concentration (SSC) density-based surrogates have been tested and found promising in laboratory studies (Lewis and Rasmussen, 1999). Attempts to use the technology in the field have given mixed results: Larsen et al., 2001 found “some correspondence” between the densiometric measurements and SSC, Gray et al., 2010 using the same methods but on the Paria River has similar mixed results, and Brown et al., 2015 had much more promising results but concluded that the techniques they used would limit results to streams with SSC greater than ~10,000 mg/l. More recent unpublished work by the Concessionary of the Rhone River (CNR) in France using new instrumentation has shown even more promise. The CNR is responsible for the operation of a series of dams on the Rhone River, as part of these operations they release sediment flushing flows to transport channel filling sediments downstream though the series of dams. To minimize flushing operation costs, they monitor the SSC during these flows using density as one of the surrogates. Using commercially available fluid density meters (surrogate for total SSC) through which river water is pumped, combined with turbidity measurements (surrogate for silt and clay SSC) and physical samples they create continuous SSC records for both sand and silt and clay portions of SSC. They have found that the calibrated density measurements are in good agreement with the physical samples for concentrations above ~2,000 mg/l (G. Pierrefeu, June 25, 2024, personnel communication).
The purchased flow and density meter must have the following salient characteristics:
Real-time flow and density measurements for pumped slurry and water Real-time output to computer for recording and analysis Measurement tube diameter of ¾ inch Liquid flow accuracy equal to or less than 0.1% Liquid Density accuracy equal to or less than 0.005 gram/cubic centimeter Stainless Steel construction
DELIVER TO:
| Name of Company: | US Geological Survey, Grand Canyon Monitoring and Research Center |
| Address: | 2255 N. Gemini Dr, Flagstaff, AZ 86001 |
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