MeyerFire
  • Blog
  • Forum
  • THE TOOLKIT
    • SUBMIT AN IDEA
    • BACKFLOW DATABASE*
    • CLEAN AGENT ESTIMATOR*
    • CLOUD CEILING CALCULATOR
    • DOMESTIC DEMAND*
    • FIRE FLOW CALCULATOR*
    • FIRE PUMP ANALYZER*
    • FIRE PUMP DATABASE*
    • FRICTION LOSS CALCULATOR
    • HANGER SPACER*
    • IBC TRANSLATOR*
    • K-FACTOR SELECTOR*
    • NFPA 13 EDITION TRANSLATOR ('19 ONLY)
    • NFPA 13 EDITION TRANSLATOR ('99-'22)*
    • LIQUIDS ANALYZER*
    • OBSTRUCTION CALCULATOR
    • OBSTRUCTIONS AGAINST WALL*
    • PLUMBING FIXTURE COUNTS
    • QUICK RESPONSE AREA REDUCTION
    • REMOTE AREA ANALYZER*
    • SPRINKLER DATABASE*
    • SPRINKLER FLOW*
    • SYSTEM ESTIMATOR*
    • TEST & DRAIN CALCULATOR
    • THRUST BLOCK CALCULATOR
    • TRAPEZE CALCULATOR
    • UNIT CONVERTER
    • VOLUME & COMPRESSOR CALCULATOR
    • WATER STORAGE*
    • WATER SUPPLY (US)
    • WATER SUPPLY (METRIC)
  • UNIVERSITY
    • About
    • Catalog
    • CONTENT LIBRARY
  • PE Exam
    • PE Forum & Errata
    • PE Store
    • PE Tools
    • PE Prep Series
    • PE 100-Day Marathon
  • LOGIN
  • PRICING
    • SOFTWARE & TRAINING
    • STORE
  • THE CAUSE
    • ABOUT US
    • BECOME AN INSTRUCTOR
    • HELP/SUPPORT
Picture

How to Inspect for Hangers?

3/19/2022

0 Comments

 
MeyerFire University | FX103.15
By Franck Orset
RESOURCES
  • Notes Page

TRANSCRIPT

How do you inspect hangers?  

HANGER POSITION

We’re continuing on our series covering inspections from an insurer’s point of view. Today we’re covering hangers for fire suppression systems. 

The position of hangers should be checked during the field inspection. Here, we’re looking for obvious deviation from the standards. 

HANGER POSITION CONT

Normally, there should be a minimum of one hanger for each section of pipe, though there might be some exceptions. This comes up commonly when sprinklers are close together, or there are a sequence of small pipe jogs that aren’t particularly long. 

Missing hangers or hangers that are detached should be reported for corrective action.  

Hangers should not be located too close to upright oriented sprinklers. We don’t want the hanger itself to create an obstruction to the water discharge from the sprinkler. For upright sprinklers, a minimum of 3-inches should be maintained to avoid affecting the distribution pattern. This doesn’t apply to pendent or sidewalls, since the hangers don’t obstruct the spray.  

PIPE END SECTIONS

The end section of pipes is also an area of concern. These can be missed frequently in the field.  

To avoid a long run of pipe cantilevered at the end, hangers need to be within a certain distance to the end of a pipe. NFPA 13 addresses these as the “maximum unsupported horizontal lengths of pipe”. It details the maximum distance between the last hanger and the end of the horizontal pipe. These limits are: 
​
  • 3 ft for 1” pipe  
  • 4 ft for 1”1/4 pipe  
  • 5 ft for 1”1/2 pipe and more  

There are also requirements for preventing pipe moving vertically upward. If a sudden surge in pressure occurs, either from a pendent sprinkler spray under a lot of pressure, or from a fire pump kicking on, we don’t want the system to move significantly and potentially risk not getting water where it needs to go.  

For systems subject to pressures over 100 psi (or 6.9 Bar), we use surge restrainers to limit the upward movement of pipe. Another method is to deliberately cut the hanger rod so that the rod prevents upward pipe movement. This takes a little more field effort, but works just as well. 

Suppression systems need adequate support to avoid movement during the dynamic course of a fire, but we also need to be kind to the building structure. We don’t want to create too much load or strain that a facility cannot handle structurally. 

EARTHQUAKES & SWAY BRACINGS

Many additional provisions come in with bracing and restraint in areas subject to earthquakes. We’ll spend plenty of time on this in the future, but know that if a building is required to be protected against seismic activity then we would also be looking to review seismic bracing and restraint throughout the system.  

For a quick overview of hangers from an insurance perspective, we’re generally concerned with the frequency of hangers, adequate support and attachment to the building, and guards against upward movement on the end of lines. 

I’m Franck Orset, this is MeyerFire University 
0 Comments



Leave a Reply.

    Sentry Page Protection
    Please Wait...

    FULL CATALOG

    SEARCH

    FILTER BY:

    All
    By: Aaron Johnson
    By: Al Yakel
    By: Ben Brooks
    By: Chris Campbell
    By: Chris Logan
    By: David Stacy
    By: Edward Henderson
    By: Franck Orset
    By: Joe Meyer
    By: Kelsey Longmoore
    By: Steve Frederick
    By: Steven Barrett
    By: Tyler Mobley
    Category: Business
    Category: Documents
    Category: Fire Alarm
    Category: Fundamentals
    Category: Life Safety
    Category: Smoke Control
    Category: Suppression
    Category: Tools
    Course
    Exercise
    Level: Advanced
    Level: Intermediate
    Level: Introductory
    On-Demand Course
    Simulation
    Workshop

    ARCHIVES:

    February 2023
    January 2023
    December 2022
    November 2022
    October 2022
    September 2022
    August 2022
    July 2022
    June 2022
    May 2022
    April 2022
    March 2022
    February 2022
    January 2022
    December 2021
    November 2021
    October 2021
    September 2021
    August 2021
    July 2021
    June 2021
    May 2021

    INSTRUCTORS:

    Aaron Johnson, CFEI
    Al Yakel, SET
    ​Chris Campbell, PE
    ​Chris Logan, CFPS, RSE
    ​
    David Stacy, PE
    Ed Henderson, PE
    ​Franck Orset
    Joe Meyer, PE
    Steve Frederick

    RSS Feed

Picture
​Home
Our Cause
The Blog
The Forum
PE Exam Prep
The Toolkit

MeyerFire University
​Pricing
Login
​Support
Contact Us
Picture

MeyerFire.com is a startup community built to help fire protection professionals shine.
Our goal is to improve fire protection practices worldwide. We promote the industry by creating helpful tools and resources, and by bringing together industry professionals to share their expertise.

​MeyerFire, LLC is an International Code Council Preferred Education Provider.

All text, images, and media ​Copyright © 2022 MeyerFire, LLC

We respect your privacy and personal data. See our Privacy Policy and Terms of Service. 
The views, opinions, and information found on this site represent solely the author and do not represent the opinions of any other party, nor does the presented material assume responsibility for its use. Fire protection and life safety systems constitute a critical component for public health and safety and you should consult with a licensed professional for proper design and code adherence.

Discussions are solely for the purpose of peer review and the exchange of ideas. All comments are reviewed. Comments which do not contribute, are not relevant, are spam, or are disrespectful in nature may be removed. Information presented and opinions expressed should not be relied upon as a replacement for consulting services. Some (not all) outbound links on this website, such as Amazon links, are affiliate-based where we receive a small commission for orders placed elsewhere.

  • Blog
  • Forum
  • THE TOOLKIT
    • SUBMIT AN IDEA
    • BACKFLOW DATABASE*
    • CLEAN AGENT ESTIMATOR*
    • CLOUD CEILING CALCULATOR
    • DOMESTIC DEMAND*
    • FIRE FLOW CALCULATOR*
    • FIRE PUMP ANALYZER*
    • FIRE PUMP DATABASE*
    • FRICTION LOSS CALCULATOR
    • HANGER SPACER*
    • IBC TRANSLATOR*
    • K-FACTOR SELECTOR*
    • NFPA 13 EDITION TRANSLATOR ('19 ONLY)
    • NFPA 13 EDITION TRANSLATOR ('99-'22)*
    • LIQUIDS ANALYZER*
    • OBSTRUCTION CALCULATOR
    • OBSTRUCTIONS AGAINST WALL*
    • PLUMBING FIXTURE COUNTS
    • QUICK RESPONSE AREA REDUCTION
    • REMOTE AREA ANALYZER*
    • SPRINKLER DATABASE*
    • SPRINKLER FLOW*
    • SYSTEM ESTIMATOR*
    • TEST & DRAIN CALCULATOR
    • THRUST BLOCK CALCULATOR
    • TRAPEZE CALCULATOR
    • UNIT CONVERTER
    • VOLUME & COMPRESSOR CALCULATOR
    • WATER STORAGE*
    • WATER SUPPLY (US)
    • WATER SUPPLY (METRIC)
  • UNIVERSITY
    • About
    • Catalog
    • CONTENT LIBRARY
  • PE Exam
    • PE Forum & Errata
    • PE Store
    • PE Tools
    • PE Prep Series
    • PE 100-Day Marathon
  • LOGIN
  • PRICING
    • SOFTWARE & TRAINING
    • STORE
  • THE CAUSE
    • ABOUT US
    • BECOME AN INSTRUCTOR
    • HELP/SUPPORT