Attachment A - Hydrostatic Flow Test Report.pdf

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DESIGN BUILD CONSTRUCTION FOR UTILITY INFRASTRUCTURE, ROADS & CLINIC AT USCG BASE CHARLESTON, SOUTH CAROLINA
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70Z04725RPCNI0007
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This document is a Hydrostatic Flow Test Report prepared by TranSystems for the US Coast Guard Base Charleston - Pier "November" Replacement project. The report details water distribution system testing performed on August 12, 2021, at six hydrants along S. Hobson and Dyess Avenues. The tests were conducted in accordance with NFPA 291 "Recommended Practice for Fire Flow Testing and Marking of Hydrants" to determine the rate of water flow available for fire-fighting purposes and assess the overall strength and capacity of the water distribution system.

The test results revealed varying Available Fire Flow Rates (Q20) across the six tested hydrants, ranging from 3,054 to 4,618 gallons per minute. The highest flow rate of 4,618 gpm was recorded at hydrant 08-N11-0216 on the corner of Halsey and Dyess. TranSystems noted a potential issue with the water distribution system, suggesting that an isolation valve along the Transmission Main or Hobson Distribution Main may be throttled down or closed, which could reduce available flow around the project site and within the Federal Law Enforcement Training Center (FLETC) Complex. The report recommends that Charleston Water System investigate and resolve this potential valve restriction to maintain proper water flow and quality.

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TranSystems

4400 Leeds Avenue Suite 430 Charleston, SC 29405 Tel 843-266-9300 Fax 843-529-9616 www.transystems.com

Hydrostatic Flow Tests (DRAFT) Report 08/20/2021 Tetra Tech US Coast Guard Base Charleston – Pier “November” Replacement

TranSystems has been retained to coordinate the performance of Hydrostatic Flow Tests to determine the rate of flow available at specific locations for fire-fighting purposes and to determine the overall strength and available capacity of the water distribution system for design and construction at a Project Site.

Location:

The Project Site is a portion of the area of the former Charleston Naval Complex which is bounded on the west by Viaduct Road, on the north by Cooper River, on the east by Halsey Street, and on the south by Bainbridge Ave. Potable Water utility services for the site are provided by Charleston Water System (CWS), a municipal entity separate from the City of Charleston, SC.

Utility Description:

Potable water for the site is supplied by a looped network of Ductile Iron Pipe (DIP) as depicted by Exhibit – 001 and mainly consists of a 16” Transmission Main on the west end which feeds parallel 12” Distribution Mains along S. Hobson and Bainbridge Avenues. The loop is completed on the east end by several 6”, 8”, 10”, & 12”mains. Fire hydrants are located along S. Hobson Ave. Dyess Ave., and Halsey St. at an average spacing of 600’ and are typically 3-way Mueller or American Darling hydrants. Two hydrants are located along Bainbridge Ave.; but, are inaccessible to the site as they are located outside of the perimeter security fence. Water valves throughout the project site and the former Charleston Naval Complex are “Open Left” valves with all other valves within the CWS systems being “Open Right”. Please refer to the CWS Valve Cards containing the hydrants to be tested.

Test Performed:

Hydrostatic flow tests were performed by CWS Staff with oversight and observations by TranSystems at six hydrants along S. Hobson and Dyess Avenues on Thursday, August 12th 2021. The Hydrostatic Flow Tests were performed in accordance with NFPA 291 “Recommended Practice for Fire Flow Testing and Marking of Hydrants”. To obtain satisfactory test results, two hydrants were flowed for each test to ensure that the pressure drop at the Residual Hydrant was at least 25% of the Static Pressure as stipulated in NFPA 291 paragraph 4.3.6. Please refer to the Hydrostatic Flow Test calculations for each hydrant tested to ascertain the Available Fire Flow Rate (Q20).

Results:

Hydrant Number Q20 (gpm)

08-N11-0199 3,136

08-N11-0201 3,054

08-N11-0207 3,548

08-N11-0216 4,618

08-N11-0217 4,509

08-N11-0231 3,943

The test results of the Available Fire Flow Rates (Q20) are summarized in the table above and are shown on Exhibit – 001. As can be seen in the Exhibit, the highest flow rate is 4,618 gpm at hydrant 08-N11-0216 on the corner of Halsey and Dyess, with the flow rates progressively decreasing in a counter-clockwise direction around the pipe loop, even though the subsequent hydrants are progressively closer to the 16” Transmission Main feeding the loop. This appears to indicate that an isolation valve located along the Transmission Main or the Hobson Distribution Main is either throttled down or closed creating a dead-end run out of the looped system. This effectively reduces the available flow around the Project Site and within the FLETC Complex. TranSystems has asked CWS to investigate and resolve the issue as the distribution system around the Project Site is looped specifically to provide more flow, to maintain more residual chlorine for disinfection, and to provide better water quality. In addition, FLETC has reportedly experienced some issues with limited available flow capacity.

Results from CWS’s investigation will be forwarded upon receipt.

VALVE CARDS

Charleston Water System

Hydrostatic Flow Test Calculations

TranSystems

Main Size (in): 12 Nozzle Ht (in): 18.00 Ground Elev (Ft):

Nozzle Dia (in): 2.5 Nozzle Ht (in): 16.00 Ground Elev (Ft):

Nozzle Dia (in): 2.5 Nozzle Ht (in): 20.00 Ground Elev (Ft):

Time: 11:15 Duration (min): 3.0

86 psi Flow Pressure A: 25 psi Nozzles Flowed: 2

26 psi Flow Pressure B: 15 psi Nozzles Flowed: 2

Pressure Drop: 60 psi = 69.8 % Total Test Flow = 2,979 gpm Consumption (Est): 8,937 gal

Hydrant A Coeff: 0.90

Hydrant B Coeff: 0.90

Min Reqd Fire Flow Pressure: 20 psi Available Fire Flow (Q20) = gpm

Min Reqd Domestic Demand Pressure: 25 psi Available Domestic Flow (Q25) = gpm

Reqd Fire Service Demand Pressure: psi Available Fire Service Flow (Q) = gpm

Reqd Fire Service Demand Flow: gpm Fire Hydrant Bonnet Color:

EQUATIONS USED

Flow Hydrant

Project Location:

USCG Base Charleston - Pier "N" Replacement

FLETC - Btwn Hobson & Dyess Ave, Brumby & Halsey St

RESULTS

Residual Hydrant: #

Flow Hydrant B: #

08-N11-0199

08-N11-0207

TEST HYDRANT DATA

GAUGE READINGS

Residual Pressure:

Residual Hydrant

HYDROSTATIC

FLOW TEST

Test Date:

Project #:

TranSystems 4400 Leeds Avenue

Suite 430 Charleston, SC 29405 www.TranSystems.com

Project Title: 8/12/2021

P306210051

08-N11-0201

Flow Hydrant A: #

Static Pressure:

3,006

TEST EQUIPMENT DATA

Equip Make & Model (Hyd A):

Blue

LOCATION SKETCH

Equip Make & Model (Hyd B):

3,136

Pollard Water - Hydrant Pro 100 Diffuser

Pollard Water - Hydrant Pro 100 Diffuser

FLOW_PRESS

NOZZLE_DIAHYD_COEFF29.84TEST_FLOW

0.54

RESSRESIDUAL_PSSSTATIC_PRE

0.54

SSDEMAND_PRESSSTATIC_PRE

_FLOWTOTAL_TESTFLOWAVAILABLE_

0 500 1000 1500 2000 2500 3000 3500 4000

P S

I

GPM

AVAILABLE FLOW

Main Size (in): 12 Nozzle Ht (in): 20.00 Ground Elev (Ft):

Nozzle Dia (in): 2.5 Nozzle Ht (in): 18.00 Ground Elev (Ft):

Nozzle Dia (in): 2.5 Nozzle Ht (in): 18.00 Ground Elev (Ft):

Time: 11:45 Duration (min): 3.0

86 psi Flow Pressure A: 23 psi Nozzles Flowed: 2

24 psi Flow Pressure B: 16 psi Nozzles Flowed: 2

Pressure Drop: 62 psi = 72.1 % Total Test Flow = 2,953 gpm Consumption (Est): 8,859 gal

Hydrant A Coeff: 0.90

Hydrant B Coeff: 0.90

Min Reqd Fire Flow Pressure: 20 psi Available Fire Flow (Q20) = gpm

Min Reqd Domestic Demand Pressure: 25 psi Available Domestic Flow (Q25) = gpm

Reqd Fire Service Demand Pressure: psi Available Fire Service Flow (Q) = gpm

Reqd Fire Service Demand Flow: gpm Fire Hydrant Bonnet Color:

EQUATIONS USED

Flow Hydrant

Project Location:

USCG Base Charleston - Pier "N" Replacement

FLETC - Btwn Hobson & Dyess Ave, Brumby & Halsey St

RESULTS

Residual Hydrant: #

Flow Hydrant B: #

08-N11-0201

08-N11-0203

TEST HYDRANT DATA

GAUGE READINGS

Residual Pressure:

Residual Hydrant

HYDROSTATIC

FLOW TEST

Test Date:

Project #:

TranSystems 4400 Leeds Avenue

Suite 430 Charleston, SC 29405 www.TranSystems.com

Project Title: 8/12/2021

P306210051

08-N11-0199

Flow Hydrant A: #

Static Pressure:

2,927

TEST EQUIPMENT DATA

Equip Make & Model (Hyd A):

Blue

LOCATION SKETCH

Equip Make & Model (Hyd B):

3,054

Pollard Water - Hydrant Pro 100 Diffuser

Pollard Water - Hydrant Pro 100 Diffuser

FLOW_PRESS

0.54

SSDEMAND_PRESSSTATIC_PRE

_FLOWTOTAL_TESTFLOWAVAILABLE_

0 500 1000 1500 2000 2500 3000 3500 4000

P S

I

Main Size (in): 12 Nozzle Ht (in): 16.00 Ground Elev (Ft):

Nozzle Dia (in): 2.5 Nozzle Ht (in): 18.00 Ground Elev (Ft):

Time: 10:50 Duration (min): 3.0

89 psi Flow Pressure A: 30 psi Nozzles Flowed: 2

34 psi Flow Pressure B: 15 psi Nozzles Flowed: 2

Pressure Drop: 55 psi = 61.8 % Total Test Flow = 3,139 gpm Consumption (Est): 9,417 gal

Hydrant A Coeff: 0.90

Hydrant B Coeff: 0.90

Min Reqd Fire Flow Pressure: 20 psi Available Fire Flow (Q20) = gpm

Min Reqd Domestic Demand Pressure: 25 psi Available Domestic Flow (Q25) = gpm

Reqd Fire Service Demand Pressure: psi Available Fire Service Flow (Q) = gpm

Reqd Fire Service Demand Flow: gpm Fire Hydrant Bonnet Color:

EQUATIONS USED

Flow Hydrant

Project Location:

USCG Base Charleston - Pier "N" Replacement

FLETC - Btwn Hobson & Dyess Ave, Brumby & Halsey St

RESULTS

Residual Hydrant: #

Flow Hydrant B: #

08-N11-0207

08-N11-0231

TEST HYDRANT DATA

GAUGE READINGS

Residual Pressure:

Residual Hydrant

HYDROSTATIC

FLOW TEST

Test Date:

Project #:

TranSystems 4400 Leeds Avenue

Suite 430 Charleston, SC 29405 www.TranSystems.com

Project Title: 8/12/2021

P306210051

08-N11-0199

Flow Hydrant A: #

Static Pressure:

3,407

TEST EQUIPMENT DATA

Equip Make & Model (Hyd A):

Blue

LOCATION SKETCH

Equip Make & Model (Hyd B):

3,548

Pollard Water - Hydrant Pro 100 Diffuser

Pollard Water - Hydrant Pro 100 Diffuser

FLOW_PRESS

0.54

SSDEMAND_PRESSSTATIC_PRE

_FLOWTOTAL_TESTFLOWAVAILABLE_

0 500 1000 1500 2000 2500 3000 3500 4000 4500

P S

I

Nozzle Dia (in): 2.5 Nozzle Ht (in): 16.00 Ground Elev (Ft):

Time: 9:10 Duration (min): 3.0

86 psi Flow Pressure A: 35 psi Nozzles Flowed: 2

46 psi Flow Pressure B: 21 psi Nozzles Flowed: 2

Pressure Drop: 40 psi = 46.5 % Total Test Flow = 3,524 gpm Consumption (Est): 10,572 gal

Hydrant A Coeff: 0.90

Hydrant B Coeff: 0.90

Min Reqd Fire Flow Pressure: 20 psi Available Fire Flow (Q20) = gpm

Min Reqd Domestic Demand Pressure: 25 psi Available Domestic Flow (Q25) = gpm

Reqd Fire Service Demand Pressure: psi Available Fire Service Flow (Q) = gpm

Reqd Fire Service Demand Flow: gpm Fire Hydrant Bonnet Color:

EQUATIONS USED

Flow Hydrant

Project Location:

USCG Base Charleston - Pier "N" Replacement

FLETC - Btwn Hobson & Dyess Ave, Brumby & Halsey St

RESULTS

Residual Hydrant: #

Flow Hydrant B: #

08-N11-0216

08-N11-0217

TEST HYDRANT DATA

GAUGE READINGS

Residual Pressure:

Residual Hydrant

HYDROSTATIC

FLOW TEST

Test Date:

Project #:

TranSystems 4400 Leeds Avenue

Suite 430 Charleston, SC 29405 www.TranSystems.com

Project Title: 8/12/2021

P306210051

08-N11-0287

Flow Hydrant A: #

Static Pressure:

4,426

TEST EQUIPMENT DATA

Equip Make & Model (Hyd A):

Blue

LOCATION SKETCH

Equip Make & Model (Hyd B):

4,618

Pollard Water - Hydrant Pro 100 Diffuser

Pollard Water - Hydrant Pro 100 Diffuser

FLOW_PRESS

0.54

SSDEMAND_PRESSSTATIC_PRE

_FLOWTOTAL_TESTFLOWAVAILABLE_

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000

P S

I

Nozzle Dia (in): 2.5 Nozzle Ht (in): 16.00 Ground Elev (Ft):

Time: 9:30 Duration (min): 3.0

86 psi Flow Pressure A: 35 psi Nozzles Flowed: 2

45 psi Flow Pressure B: 20 psi Nozzles Flowed: 2

Pressure Drop: 41 psi = 47.7 % Total Test Flow = 3,487 gpm Consumption (Est): 10,461 gal

Hydrant A Coeff: 0.90

Hydrant B Coeff: 0.90

Min Reqd Fire Flow Pressure: 20 psi Available Fire Flow (Q20) = gpm

Min Reqd Domestic Demand Pressure: 25 psi Available Domestic Flow (Q25) = gpm

Reqd Fire Service Demand Pressure: psi Available Fire Service Flow (Q) = gpm

Reqd Fire Service Demand Flow: gpm Fire Hydrant Bonnet Color:

EQUATIONS USED

Flow Hydrant

Project Location:

USCG Base Charleston - Pier "N" Replacement

FLETC - Btwn Hobson & Dyess Ave, Brumby & Halsey St

RESULTS

Residual Hydrant: #

Flow Hydrant B: #

08-N11-0217

08-N11-287

TEST HYDRANT DATA

GAUGE READINGS

Residual Pressure:

Residual Hydrant

HYDROSTATIC

FLOW TEST

Test Date:

Project #:

TranSystems 4400 Leeds Avenue

Suite 430 Charleston, SC 29405 www.TranSystems.com

Project Title: 8/12/2021

P306210051

08-N11-0216

Flow Hydrant A: #

Static Pressure:

4,321

TEST EQUIPMENT DATA

Equip Make & Model (Hyd A):

Blue

LOCATION SKETCH

Equip Make & Model (Hyd B):

4,509

Pollard Water - Hydrant Pro 100 Diffuser

Pollard Water - Hydrant Pro 100 Diffuser

FLOW_PRESS

0.54

SSDEMAND_PRESSSTATIC_PRE

_FLOWTOTAL_TESTFLOWAVAILABLE_

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500

P S

I

Nozzle Dia (in): 2.5 Nozzle Ht (in): 20.00 Ground Elev (Ft):

Nozzle Dia (in): 2.5 Nozzle Ht (in): 16.00 Ground Elev (Ft):

Time: 10:10 Duration (min): 3.0

86 psi Flow Pressure A: 36 psi Nozzles Flowed: 2

37 psi Flow Pressure B: 16 psi Nozzles Flowed: 2

Pressure Drop: 49 psi = 57 % Total Test Flow = 3,357 gpm Consumption (Est): 10,071 gal

Hydrant A Coeff: 0.90

Hydrant B Coeff: 0.90

Min Reqd Fire Flow Pressure: 20 psi Available Fire Flow (Q20) = gpm

Min Reqd Domestic Demand Pressure: 25 psi Available Domestic Flow (Q25) = gpm

Reqd Fire Service Demand Pressure: psi Available Fire Service Flow (Q) = gpm

Reqd Fire Service Demand Flow: gpm Fire Hydrant Bonnet Color:

EQUATIONS USED

08-N11-0207

Flow Hydrant A: #

Static Pressure:

3,779

TEST EQUIPMENT DATA

Equip Make & Model (Hyd A):

Blue

LOCATION SKETCH

Equip Make & Model (Hyd B):

3,943

Pollard Water - Hydrant Pro 100 Diffuser

Pollard Water - Hydrant Pro 100 Diffuser

HYDROSTATIC

FLOW TEST

Test Date:

Project #:

TranSystems 4400 Leeds Avenue

Suite 430 Charleston, SC 29405 www.TranSystems.com

Project Title: 8/12/2021

P306210051

Flow Hydrant

Project Location:

USCG Base Charleston - Pier "N" Replacement

FLETC - Btwn Hobson & Dyess Ave, Brumby & Halsey St

RESULTS

Residual Hydrant: #

Flow Hydrant B: #

08-N11-0231

08-N11-0228

TEST HYDRANT DATA

GAUGE READINGS

Residual Pressure:

Residual Hydrant

FLOW_PRESS

0.54

SSDEMAND_PRESSSTATIC_PRE

_FLOWTOTAL_TESTFLOWAVAILABLE_

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

P S

I

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