NYS Office of General Services

NYS Office of General Services

Background:

This 142 cfs (92 MGD, 14,511 m3/h) cooling water intake is located in Albany, NY and provides water to both heat and cool buildings owned and operated by the state of New York. The facility was required to install 0.75-mm slot size wedgewire screens with a through-screen velocity of no more than 0.5 fps (15 cm/s) to reduce both entrainment and impingement in accordance with NYS Commissioner Policy #52. Fish species offered protection by this screening system include river herring (Alewife and Blueback Herring), Atlantic Sturgeon, Shortnose Sturgeon, and tens of other anadromous, catadromous, and resident Hudson River fish species. This project is to be fabricated in 2021 and installed in 2022 and this page will be updated as the project progresses.
ISI is providing four T72-84EA-R screens where each T screen unit has two 72-inch (1,829-mm) diameter, 84-inch (2,134-mm) long cylindrical wedgewire screens with 0.75-mm slot openings and a 30 percent open area. The screens surface area provided by this system results in a through-screen velocity of 0.45 fps at the design capacity of 142 cfs (92 MGD, 14,511 m3/h). The screens are retractable T screen with slide gates. ISI is also providing large bypass gates which will allow the facility to withdraw Hudson River water without use of the T screens during winter operation.

Benefit of ISI System

ISI's retrievable brush-cleaned cylindrical screen system was selected as the project's preferred alternative as it provided the following key advantages:


  1. The brush cleaning system ensures that the screen surface will remain free of debris and fouling organisms and therefore maintain compliance with through-screen velocity requirements and reliably source water to the facility;

  2. The on-river design keeps fish in the river rather than subject them to any type of collection or conveyance which would have occurred under a retrofit of the existing traveling screens for fish protection;

  3. The cylindrical screen design provides the necessary screen surface area with a reduced facility footprint compared to other concepts;

  4. The retrievable screen with gate design allows the screens to be raised out of the river when entrainment and impingement are documented to be very low and avoid potential interactions with surface and frazil ice which have been documented to occur at the site;

  5. The submerged screen design allows withdrawals to occur over tidal and seasonal river stage fluctuations;

  6. The retrievable screen design allows inspection and maintenance of individual screen units without shutting down facility operations.

Owner:

NYS Office of General Services

Engineer(s):

HDR

General Contractor:

D.A. Collins

Location:

Hudson River, Albany, NY


Year Installed:

2022

Slot Size:

0.75 mm

Screen Model:

T72-84EA-R

Drive System:

Electric

Industry:

Industrial Facility

Water Body:

Stream/River

Flow Rate:

142 cfs (92 MGD, 14,511 m3/h)

Screen Type:

T Screens (dual cylinders)

Retrieval Systems:

Retrievable Vertical Track

Number of Screens:

4

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