# Re: inrack sprinkler question

```The only exception to the practice of balancing is that new single layer scheme
way at the end of the in rack section of Data Sheet 8-9.```
```
Best

Bruce Verhei

> On Feb 23, 2018, at 12:40, Ron Greenman <rongreen...@gmail.com> wrote:
>
> I've seen in-racks that seem to be essentially a separate system as they
> come off a common manifold and look like risers, and still calculate both
> back to the manifold, adjust there and the calc out to the source.
>
>
>
> Ron Greenman
>
> rongreen...@gmail.com
>
> 253.576.9700
>
> The Universe is monstrously indifferent to the presence of man. -Werner
> Herzog, screenwriter, film director, author, actor and opera
> director (1942-)
>
>> On Fri, Feb 23, 2018 at 10:44 AM, Bob <b...@firebyknight.com> wrote:
>>
>> Timothy,
>> The in-rack demand is added to the ceiling demand at the point of
>> connection
>> to the system.  Also, the pressure is to be balanced to within .5 psi.
>>
>> From the 2013 ed.:
>> 23.8.2   Water demand of sprinklers installed in racks shall be added to
>> ceiling sprinkler water demand over the same protected area at the point of
>> connection.
>> 23.8.3   The demand shall be balanced to the higher pressure.
>> 23.8.4   Water demand of sprinklers installed in racks or water curtains
>> shall be added to the ceiling sprinkler water demand
>> at the point of connection. Demands shall be balanced to the higher
>> pressure. (See Chapter 8.)
>>
>> 23.4.2.4  Hydraulic Junction Points.
>> 23.4.2.4.1   Pressures at hydraulic junction points shall balance within
>> 0.5
>> psi (0.03 bar).
>> 23.4.2.4.2   The highest pressure at the junction point, and the total
>> flows
>> as adjusted, shall be carried into the calculations.
>>
>>
>> Thank you,
>>
>> Bob Knight, CET III
>> 208-318-3057
>>
>> -----Original Message-----
>> From: Sprinklerforum [mailto:sprinklerforum-bounces@lists.firesprinkler.
>> org]
>> On Behalf Of Easter, Timothy M CIV NAVFAC MIDLANT, CI
>> Sent: Friday, February 23, 2018 11:30 AM
>> To: sprinklerforum@lists.firesprinkler.org
>> Subject: inrack sprinkler question
>>
>> Does the in-rack sprinkler system need to be combined with the ceiling
>> sprinkler system, for hydraulic calcs? Can anyone cite reference that
>> requires this?
>>
>> V/R,
>> Timothy M. Easter, P.E.
>> NAVFAC Mid-Atlantic
>> Capital Improvements
>> Fire Protection Engineer
>> Comm: (757) 341 - 0130 / DSN 341 - 0130
>> Office Hours: 0800 - 1730
>> RDO: 2nd Friday
>>
>>
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