Water Curtain in Addition to Remote Area?

7/16/2019

We have to provide sprinklers 4 feet on center to protect the opening between a commercial kitchen and a seating area.

The number of heads to be calculated is based on the 1.2 times the square root of 1500 per NFPA 13 2007 Edition. W have first calculated the water curtain demand assuming each sprinkler needs to flow 15 gpm.

We get a required pressure and flow for the end node serving the water curtain. The calculated flow/pressure is then used in the full calc to balance the remaining system around. So in essence we are calculating the system in two parts.

Is this the correct methodology? As best I can tell the water curtain demand must be in addition and must be balanced with the remote area.

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7 Comments

Rusty Scott

7/16/2019 10:27:30 am

Out of curiosity because I'm doing my first water curtain system in the near future, what type of sprinkler heads are you using? I've seen specific water curtain type heads from out of US companies and I've done some light reading that you can use pendent or vertical sidewall type on horizontal as well. Not sure what's true or preferred method, any thoughts?

Your logic about finding the pressure and flow of the end node makes sense. Using that information to balance the remaining system also makes logical sense to me to create an even distributed water curtain. Once again I've never done one before so I wouldn't know the correct methodology without researching more.

Marina link

7/16/2019 10:57:26 am

I use Tyco TY3388 and TY3488

Wayne Ammons

7/16/2019 12:00:29 pm

These are specific application window sprinklers and are specifically listed for the purpose of protecting glazing. They have a different intent than sprinklers used for the purposes of providing a water curtain. Standard spray sprinklers can be used for a water curtain.

Pari

7/16/2019 10:27:57 am

If space between sprinkler is 4 feet , baffles required.

Sprinkler are closer than 6 feet , cross baffles required. NFPA 13 section 8.15.4.3.2

Hydraulic design calculation , shall include a design area selected to include ceiling sprinkler adjacent to the water curtain. NFPA 13 Section 11.3.3.4

Mike

7/16/2019 11:33:10 am

11.3.3.1 Sprinklers in a water curtain such as described in
8.15.4 or 8.15.17.2 shall be hydraulically designed to provide a
discharge of 3 gpm per lineal foot (37 L/min per lineal meter)
of water curtain, with no sprinklers discharging less than
15 gpm (57 L/min).

11.3.3.4 Hydraulic design calculations shall include a design
area selected to include ceiling sprinklers adjacent to the wa
-ter curtain

There is no need for specific application sprinklers. SSP or SSU can be used.

K.T.Daniel Raj

6/5/2021 07:23:29 am

We are considered arround -500 water curtain .. what's pumps required.. kindly give me suggestions..

Joel Mathew

11/10/2022 03:08:27 pm

What code or NFPA section is this requirement for the protection between kitchen and seating from?

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Water Curtain in Addition to Remote Area?

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