PE Problem #10

6/14/2018

A class III commodity is encapsulated and stored on shelves within a large walk-in cooler. A dry system is being designed to serve this hazard. If the storage is anticipated to be 13 ft. in height with a 17 ft. ceiling, determine the required design density with the smallest remote area for high temperature sprinkler protection using the Control Mode Density/Area approach.
a. 0.14 gpm/sqft / 2,000 sqft
b. 0.14 gpm/sqft / 2,600 sqft
c. 0.15 gpm/sqft / 2,600 sqft
d. 0.17 gpm/sqft / 2,000 sqft

Solution | Posted 06/15/18

12 Comments

FPE

6/14/2018 08:02:39 am

c. 0.15 gpm/sqft / 2,600 sqft
(Ref. NFPA 13-2016, figure 14.2.4.2 and section 14.2.4.5.

EwdH

6/14/2018 09:26:08 am

c. Not less than 0.15 gpm/sqft / 2,600 sqft

NFPA 13-2016 14.2.4.5

jakes

6/14/2018 10:45:46 am

the correct answer is not an option, it should be 0.225 gpm/ft2 /3000 ft2

Per NFPA13-2016 14.2.4.7

KJK

6/14/2018 05:59:41 pm

Except we aren't using ordinary temp heads, and the question doesn't clarify what type of shelves are used.

jakes

6/15/2018 09:15:42 am

true, but with the assumption of back-to-back storage, this is true even for high temp rated sprinklers

6/14/2018 03:42:11 pm

David

6/14/2018 04:08:53 pm

DIAA

6/15/2018 03:37:35 pm

B) 2600 ft2 and denisty 0.14 gpm /ft2 as per NFPA 13 2016 ed. Figure 14.2.4.2 and its modification of caluse no. 14.2.4.3, 14.2.4.5 and figure of no. 14.2.4.3

Too long question and need the examinee to be very familiar with NGPA13 and sprinkler storage system

DIAA

6/15/2018 03:42:10 pm

The correct is C) not B) due to 14..2.4.5

Renardy

9/19/2018 09:20:30 pm

Section 14.2.4.6 says density shall not be less than the density for the corresponding area of operation for OH2, which at 2600 Sq. ft. of Area of operation would be a minimum of 0.17 - 0.18 density. (since storage height is over 12 ft.)

What are your thoughts on this? Thanks,

KMAB

10/8/2018 08:40:14 am

I got caught up on this too; though it looks like 0.17 - 0.18 gpm/ft^2 over 2600 ft^2 isn't an option. Does anyone have any ideas as to why this code section isn't used?

10/23/2018 07:36:17 pm

agreed should be 2600 sqft/ 0.17 gpm/sqft

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