Roof Drains Rep Search Links Contact Us Froet Home Page Sitemap
Roof Drain Roofs Drainage Roof Drains Froet Drains Roof Drain Roof Drain Downspout Nozzle Downspout Nozzle


Roof Drain Capacity Calculation
Roof Drain Flow Rates
Published Flow Rates for Froet Roof Drains

 

Please Note:
The below flow testing results are for Froet Drains only. Do not use this information with any other drain. Do not assume there are any similarities with any other drains. The flow testing results are to be use in combination with your existing piping calculations, these are not a replacement of the pipe flow results.
Froet Industries feels it is important to get this information to the enginering community so we have posted as it is. This should give you information to help you design your drainage systems correctly. If you have any questions in regard to this information please call Froet Industries.



Click the play button to play.
When Playing, Double-Click Video for Full Screen

Best viewed in Google Chrome

 


Roof Drain Capacity Calculation


Click here to use the Roof Drain GPM or SF Calculator
(You must have Microsoft Excel installed to view)

 

Roof Drain Flow Rates

(Click to view)

Drain Body: 100C2
NSF Report: J-00259280


Drain Body: 100C3
NSF Report: J-00259281


Drain Body: 100C4
NSF Report: J-00259282


Drain Body: 100C5
NSF Report: J-00259283


Drain Body: 100C6
NSF Report: J-00259284


Drain Body: 100C8
NSF Report: J-00259285


Drain Body: 200C3
NSF Report: J-00259276


Drain Body: 200C4
NSF Report: J-00259275


Drain Body: 200C5
NSF Report: J-00259278


Drain Body: 200C6
NSF Report: J-00259279



 

Flow Rates (below) for Froet Roof Drains were tested with the
primary and overflow outlets connected, which in turn vented the piping.


Froet 3” Bi-functional Drain

DRAIN WITHOUT DRAIN PIPE

Water head (inch)

1"

2"

3"

4"

5"

6"

Flow of water into box (gpm)

120

168

225

212

244

313

Velocity of flow (ft/s)

4.3

4.0

4.5

4.4

5.1

5.3

DRAIN WITH 10 FT PIPE

Water head (inch)

1"

2"

3"

4"

5"

6"

Flow of water into box (gpm)

105

220

137

157

261

522

Velocity in drain pipe (ft/s)

8.0

8.9

8.9

8.8

8.7

9.3

Pressure in drain pipe (in. W.C)

9.0

7.4

5.8

-4.2

-7.4

-24.8

DRAIN WITH MODIFIED PIPES

Water head (inch)

1"

2"

3"

4"

5"

6"

Flow of water into box (gpm)

118

154

221

261

287

423

Velocity in 1st stack (ft/s)

3.8

6.0

6.0

6.0

7.1

8.6

Velocity in horizontal pipe (ft/s)

5.5

5.8

6.0

5.7

7.6

8.3

Velocity in 2nd stack (ft/s)

6.4

6.9

7.2

7.0

6.9

7.8

Pressure in 1st stack (in. W.C)

6.8

2.6

5.0

-4.0

-14.7

-16.9

Pressure in horizontal pipe (in. W.C)

-13.0

-12.2

-12.0

-11.8

-10.2

-9.1

Pressure in 2nd stack (in. W.C)

-3.1

-14.1

-16.7

-15.8

-28.4

-32.1



Froet 4” Bi-Functional Drain

DRAIN WITHOUT DRAIN PIPE

Water head (inch)

1"

2"

3"

4"

5"

6"

Flow of water into box (gpm)

83

155

240

306

334

367

Velocity of flow (ft/s)

3.5

4.3

5.7

6.2

5.7

6.1

DRAIN WITH 10 FT PIPE

Water head (inch)

1"

2"

3"

4"

5"

6"

Flow of water into box (gpm)

117

187

254

312

497

671

Velocity in drain pipe (ft/s)

4.3

7.0

7.2

7.8

8.5

8.9

Pressure in drain pipe (in. W.C)

5.5

5.2

4.4

1.2

-15.6

-29.6

DRAIN WITH MODIFIED PIPES

Water head (inch)

1"

2"

3"

4"

5"

6"

Flow of water into box (gpm)

118

166

239

286

470

558

Velocity in 1st stack (ft/s)

3.8

3.5

5.1

5.4

7.9

7.9

Velocity in horizontal pipe (ft/s)

2.3

3.8

3.7

6.9

8.6

8.8

Velocity in 2nd stack (ft/s)

5.1

6.0

6.8

5.7

7.0

7.1

Pressure in 1st stack (in. W.C)

4.1

3.9

2.0

3.3

-15.1

-28.7

Pressure in horizontal pipe (in. W.C)

-13.2

-13.0

-13.2

-11.8

-8.4

-18.7

Pressure in 2nd stack (in. W.C)

5.5

1.4

-9.1

-19.4

-38.2

-38.4



Froet 6” Bi-Functional Drain

DRAIN WITHOUT DRAIN PIPE

Water head (inch)

1"

2"

3"

4"

5"

6"

Flow of water into box (gpm)

118

202

402

616

714

870

Velocity of flow (ft/s)

1.8

4.5

6.2

7.8

3.3

3.2

DRAIN WITH 10 FT PIPE

Water head (inch)

1"

2"

3"

4"

5"

6"

Flow of water into box (gpm)

120

192

397

604

704

866

Velocity in drain pipe (ft/s)

2.4

3.2

8.2

8.8

8.9

8.6

Pressure in drain pipe (in. W.C)

7.4

7.6

6.9

5.5

5.3

5.6

DRAIN WITH MODIFIED PIPES

Water head (inch)

1"

2"

3"

4"

5"

6"

Flow of water into box (gpm)

117

210

401

596

916

1164

Velocity in 1st stack (ft/s)

3.2

2.9

4.2

5.0

7.0

8.6

Velocity in horizontal pipe (ft/s)

0.5

3.2

5.2

6.5

7.3

6.9

Velocity in 2nd stack (ft/s)

4.2

5.9

6.4

8.0

8.9

7.9

Pressure in 1st stack (in. W.C)

15.5

17.6

17.3

18.1

14.2

-5.4

Pressure in horizontal pipe (in. W.C)

-13.2

-13.2

-13.3

-13.8

-11.7

-10.6

Pressure in 2nd stack (in. W.C)

5.9

6.0

1.9

-11.0

-22.4

-34.3





InformationDear Architects, Engineers, Building Owners, Wholesalers, Contractors and Manufacturer Representatives,

It has come to our attention that there is a rumor going around in the industry that our patent is no longer in force. That is totally false .Our patent is and will continue to be in force until November 6th, 2021. The installation of a product that infringes on our patent could present a liability issue to any entity involved in the sale or use of said product. We have made a PDF copy of our patent available for any one 's use to determine if a given product may or may not infringe on our patent.

© 2018 Froet Industries, LLC  
 
Roof Drain Roofs Drainage Roof Drains Froet Froet Drain Froet Drain Drains Downspout Nozzle Roof Drain Roof Drainage Froet Drain Froet Drain Froet Drain