System-Side Hose Connection for Foam System?

6/1/2026

Is it acceptable to have a 2-1/2-inch hose connection on the system side of a low expansion foam system?

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6 Comments

Anthony

6/1/2026 07:44:16 am

Yes, you can have a ball valve any where so using that logic this item is acceptable here. If this was intended to be used for fire fighting then you'd have to add a house allowance( i think) to the foam and water flow volume. If this is just a bulk draining convenience then it wouldn't be an issue to place where shown on the section view..

Dan Wilder

6/1/2026 08:04:59 am

Due to its position and the upper control valve shown, I don't think this is for FD use. It looks to be an alternate testing location in lieu of flowing through the system to check the proportioner, mix rates, and verify final solution %. It also provides an easy way to contain and dispose of any solution discharged.

6/1/2026 08:10:27 am

I agree, The image looks like a testing outlet. Hose is then run to containment and the foam can be tested for the proportioning rate.

Glenn

6/1/2026 08:48:28 am

Concur with Dan.

Colin B

6/1/2026 12:08:50 pm

100% agree and just designed a system like this late 2025. Having the extra hose valve allows testing without fully flowing the system to the inspector's test. Totally acceptable and I usually recommend that type of installation when possible.

Jack G

6/1/2026 07:36:06 pm

I would think for testing also.
Unless the entire system plus hose( system side of proportioned ) were calculated together, it would rob foam water solution from the system .
For it to be beneficial, a “ water only “ fdc would have to come off the bulk. The 250 gpm would be in the system calculation and would lower the pressure and flow available for the system design.
I m sure there is an outside hose allowance in the calcs .
An inside hose “ foam /water solution could be added if designed properly.
The above looks for system test.

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System-Side Hose Connection for Foam System?

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