Okay... I will insert my foot into my mouth and take a WAG. 40 x 64 = 2560-sq. ft. 9 x 20 = 180-sq. ft. x 6 tables = 1080-sq. ft. I'm trying to get a picture of what this looks like...so you are telling me that we have is: 1. all these six tables which are separated only by 1-foot in one direction and 3-foot the other direction 2. almost half of the floor of the room is obstructed 3. there will be plastic sheeting and tubing stored (?) under the tables
What you don't tell me is how many rooms there are and what they are putting on the tables. Based on the information that you have provided so far, I would recommended that they make a choice: A. sprinkler under all the table (probabaly not feasible) B. skirt around all the tables (to eliminate any storage or collection of debris) C. make the tables (platforms) out of some kind of open metal grate material. rick, city of dallas -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd - Work Sent: Wednesday, January 08, 2014 11:31 AM To: [email protected] Subject: Re: concealed space definition - part deux Each 40 ft x 64 ft room in this area has six 9 ft x 20 ft tables, spaced 1 ft apart in one direction and 3 ft apart in the other. Agricultural occupancy so OH2 design. Tables are not skirted. In addition to wood construction, there will be plastic sheeting and plastic tubing under the table. (I am using the term "table" because that is what they call them). It will be a wet environment by nature of the occupancy. One interesting semantic note is that 11.2.3.1.8 (3), which is the 3000 sqft requirement, references 8.14.6, which is the platform requirement also references combustible concealed spaces. But 8.14.6 only references combustible spaces. Nothing about them being concealed Looking at this from a practical perspective (think like fire), if a fire did start under a table, it could have significant time to develop before being detected. There may not be enough heat generated to activate a sprinkler until after it is well developed. Perhaps not until flames actually shoot up around the edge of the table. If flames shoot up around more than one side of the table (possible in a 9x20 table), then a lot of sprinklers over a fairly large area could open. More than would be included in a 1500 sqft area? Potentially. This is where my thought for the 3000 sqft area comes from. (FWIW, EH2 occupancy description also references shielded fires). As for liability, the nature of our society is that we need to consider this as well as the technical aspect of our job. Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com 860-535-2080 (ofc) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
