This is the one I use which factors in the width and depthof the top and bottom chords of the bar-joist as well as the depth and spacing. All dimensions are in inches. Output is Feet Bar-Joist Depth =BJD Depth of Top Chord =DTC CL Distance Between Joists =DBJ Bottom Chord Depth =BCD Bottom Chord Width =BCW Outside Diameter of Pipe =OD ((DBJ-BCW)*(BJD-DTC)/(BCD+OD))/12 Example:24” Deep Bar-Joist 3” Deep Top Chord 48” Between Joists 4.75” Bottom Chord Width 3” Deep Bottom Chord 2” OD Pipe ((48”-4.75”)*(24”-3”)/(3”+2.375”))/12”
43.25”*21”=908.25”/5.375”=168.9767”/12”=14’-1” Richard L. Mote, CETRimrock Design Services,LLCP.O. Box 36Middleburg, PA 17842Ph. 928.821.8725 & 570.541.2685Email: [email protected]: https://rimrockdesignservices.com -----Original Message----- From: Prahl, Craig/GVL via Sprinklerforum <[email protected]> To: [email protected] <[email protected]> Cc: Prahl, Craig/GVL <[email protected]> Sent: Mon, Dec 16, 2019 11:18 am Subject: Routing pipe through bar joist - clearance issues <!-- #yiv6536750668 _filtered #yiv6536750668 {font-family:"Cambria Math";panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv6536750668 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} #yiv6536750668 #yiv6536750668 p.yiv6536750668MsoNormal, #yiv6536750668 li.yiv6536750668MsoNormal, #yiv6536750668 div.yiv6536750668MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri", sans-serif;} #yiv6536750668 a:link, #yiv6536750668 span.yiv6536750668MsoHyperlink {color:blue;text-decoration:underline;} #yiv6536750668 a:visited, #yiv6536750668 span.yiv6536750668MsoHyperlinkFollowed {color:purple;text-decoration:underline;} #yiv6536750668 p.yiv6536750668msonormal0, #yiv6536750668 li.yiv6536750668msonormal0, #yiv6536750668 div.yiv6536750668msonormal0 {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri", sans-serif;} #yiv6536750668 p.yiv6536750668xmsonormal, #yiv6536750668 li.yiv6536750668xmsonormal, #yiv6536750668 div.yiv6536750668xmsonormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri", sans-serif;} #yiv6536750668 p.yiv6536750668xmsonormal0, #yiv6536750668 li.yiv6536750668xmsonormal0, #yiv6536750668 div.yiv6536750668xmsonormal0 {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri", sans-serif;} #yiv6536750668 p.yiv6536750668xmsochpdefault, #yiv6536750668 li.yiv6536750668xmsochpdefault, #yiv6536750668 div.yiv6536750668xmsochpdefault {margin-right:0in;margin-left:0in;font-size:10.0pt;font-family:"Calibri", sans-serif;} #yiv6536750668 span.yiv6536750668xmsohyperlink {color:blue;text-decoration:underline;} #yiv6536750668 span.yiv6536750668xmsohyperlinkfollowed {color:purple;text-decoration:underline;} #yiv6536750668 span.yiv6536750668xemailstyle20 {font-family:"Calibri", sans-serif;color:windowtext;} #yiv6536750668 span.yiv6536750668EmailStyle26 {font-family:"Calibri", sans-serif;color:windowtext;} #yiv6536750668 span.yiv6536750668SpellE {} #yiv6536750668 .yiv6536750668MsoChpDefault {font-size:10.0pt;} _filtered #yiv6536750668 {margin:1.0in 1.0in 1.0in 1.0in;} #yiv6536750668 div.yiv6536750668WordSection1 {} #yiv6536750668 _filtered #yiv6536750668 {} #yiv6536750668 ol {margin-bottom:0in;} #yiv6536750668 ul {margin-bottom:0in;} -->I’ve got a structural guy wanting to substitute bar joist for wide flange steel. The issue is clearance. They just assumed if they provided bar joist we could run our piping in the webs of the joist which would put us 1 – 5 ft above the ceiling. The spacing between joists is unknown but could be “close”. So the question, does anyone have any cheat sheets or spreadsheets showing the maximum diameter of pipe based on a full length stick that can be routed up within bar joist based on the bar joist spacing and depth? Craig Prahl|Jacobs| Group Lead/SME – Fire Protection | 864.676.5252 |[email protected]|www.jacobs.com 1041 East Butler Road Greenville, South Carolina 29606 NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer. _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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