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  1. ShawnO1

    RTU penetration head spacing

    Sadly that's what I thought. Nothing like retail work - moves so quick there's never time to wait on approvals. Thanks for your opinion and have Merry Christmas!
  2. ShawnO1

    RTU penetration head spacing

    Thanks for your reply skdesigner. I really don't mind meeting the plan reviewer's request. My issue is I like to understand his argument and remove this problem from future submittals on similar future projects. If I don't understand his argument it's going to be difficult for me to prevent...
  3. ShawnO1

    RTU penetration head spacing

    Anyone want to take a stab at this?
  4. ShawnO1

    RTU penetration head spacing

    A little background... Unobstructed noncombustible bar joist retail construction. EH density with standard coverage heads - 100 square feet max spacing. Green represents ductwork dropping down from RTUs. I am told to apply the 3X rule to the vertical ductwork and therefore maintain 24"...
  5. ShawnO1

    Flexible Sprinkler Connection Spacing

    Thanks for the info. Yhe flex heads sound good on paper and they are easy to install but the key is outlet location vs head location. They are not slinkys so if it needs to be longer after the grid is installed you have to remove the installed flex drop i.e. drain systen, retest, cut pipe, add...
  6. ShawnO1

    Flexible Sprinkler Connection Spacing

    Figured it out. After determining the entire length of the flexdrop I deducted the takeout for the branchline outlet, the head, the difference in branchline height and ceiling height. Determined the minimum distance for a bend after leaving the outlet, and then the leftover flex. Using the...
  7. ShawnO1

    Flexible Sprinkler Connection Spacing

    thanks for your response but I'm not asking about head spacing so much as I am outlet location on the branchline (the outlet the flexhead attaches to) vsersus where the actual head is located. I suppose the thread title should have been "Flexhead oultet location." If the head is very close to...
  8. ShawnO1

    Flexible Sprinkler Connection Spacing

    Morning All, So does anyone have a nice spreadsheet setup for spacing the flexible connection outlets? My brain is hurting to determine minimum and maximum locations of heads away from the branchlines while still maintaining only (2) bends with a side outlet configuration. Also when you take in...
  9. ShawnO1

    How many of you provide a new copy of NFPA 25 per system?

    twd22285- I think I'm going to add an extra $45 to the spreadsheet for all jobs and just start the chore. If a dry system freezes and burst and they didn't maintain and I DID NOT give them the NFPA 25 then the trouble can start. Still at 400 jobs a year that adds up to $18k a year which is not...
  10. ShawnO1

    How many of you provide a new copy of NFPA 25 per system?

    Check this out Per NFPA 2010... "24.4 Instructions. The installing contractor shall provide the property owner or the property owner's authorized representative with the following: (1)All literature and instructions provided by the manufacturer describing proper operation and maintenance of...
  11. ShawnO1

    How many of you provide a new copy of NFPA 25 per system?

    NJ1 - Thanks for your help. Only problem is it prints out the statement... "Copyright 2012 NFPA...for individual use and single download... No other repoduction or transmission in any form.... For inquiries or to report unauthorized use, contact locensing@nfpa.org" cdafd - I suppose I...
  12. ShawnO1

    Hangers for systems in a concrete parking structure

    +1 on the HDI-P anchors. Just be carful you are not running 6" or greater and need 1/2" all thread rod.
  13. ShawnO1

    How many of you provide a new copy of NFPA 25 per system?

    I realize it's in the code and I should be doing it. As a matter of fact it's a goal to start doing this quarter. However, at $45 a copy it can get rather expensive. $45 is a lot of money for a $5 paperback. Probably not as expensive as an insurance claim though. Does anyone have what they feel...
  14. ShawnO1

    How do you estimate fire sprinkler design hours?

    Well here's the deal. I came from the field straight into design. I've been in design for 15 years but have recently been asked to estimate design hours for upcoming bids. I don't really have a quick and dirty way to figure my design time as I haven't been tracking over the years to see how much...
  15. ShawnO1

    Section Modulus for Trap Members 10'-6" On Center

    Helpful links... https://www.wheatland.com/SpecSheets/Sprinkler/Sway%20Bracing/NFPA_13_2010_Sway-Seismic_Bracing_Sch10%20pipe.pdf https://www.wheatland.com/SpecSheets/Sprinkler/Sway%20Bracing/NFPA_13_2010_Sway-Seismic_Bracing_Sch40%20pipe.pdf Thanks for all of your advice. I have an engineer...
  16. ShawnO1

    Section Modulus for Trap Members 10'-6" On Center

    NFPA 13 gives a table of Section Modulus for varying spans of trapeze members based on 15' of water filled pipe. Not sure if anyone else installs main hangers on 15' centers but we use 10'-6" spacing and 5'-3" from each end (typical 21' lengths. 2 hanges per pipe. Is there a formula available...

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