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Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
Chapter9 Hydrant Bradburn
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Chapter9 Hydrant Bradburn

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  • 1. Fire Hydrants
  • 2. Overview <ul><li>Hydrant Uses </li></ul><ul><li>Hydrant parts </li></ul><ul><li>3. Types of hydrants </li></ul><ul><li>4. Inspection and installation </li></ul><ul><li>5. Operation and maintenance </li></ul>
  • 3. <ul><li>Hydrant Uses </li></ul><ul><li>1. Fire fighting </li></ul><ul><li>2. Flushing mains/sewers </li></ul><ul><li>3. Filling tank trucks for offsite delivery </li></ul><ul><li>4. Construction use </li></ul>
  • 4. Hydrant Parts Upper section -business end of hydrant -connection to fire hose or pump truck Lower section -connects to main -can create negative pressure
  • 5. <ul><li>Upper Section Components </li></ul><ul><li>Operating nut (5-sided)--turn counterclockwise </li></ul><ul><li>Upper barrel (cast/duct iron)--carries water to nozzle outlets </li></ul><ul><li>Outlet nozzles (threaded bronze) </li></ul><ul><li>1. Connect hose (use main pressure </li></ul><ul><li>2. Connect suction hose -- pumper truck </li></ul><ul><li>Most hydrants: </li></ul><ul><li>2--2.5” nozzles (direct hose connection) </li></ul><ul><li>1--4.5” nozzle (for suction) </li></ul>
  • 6. <ul><li>Lower Section Components </li></ul><ul><li>Lower barrel (static/centrifugally cast iron): carries water between base and upper barrel </li></ul><ul><li>Connection to upper barrel &gt; 2” from ground line </li></ul><ul><li>Main valve --operating stem, resilient valve gasket (see next slide) </li></ul><ul><li>Base --AKA: shoe, elbow, foot, inlet piece </li></ul>ground line 2”
  • 7. <ul><li>Common hydrants </li></ul><ul><li>1. Dry barrel </li></ul><ul><li>Wet-top </li></ul><ul><li>Dry-top </li></ul><ul><li>2. Wet barrel </li></ul><ul><li>3. Warm climate </li></ul><ul><li>4. Flush </li></ul><ul><li>Dry barrel hydrant: </li></ul><ul><li>-main valve, drain at base </li></ul><ul><li>-filled w/ water only when main valve open </li></ul><ul><li>-drain opens as main valve closes </li></ul><ul><li>-ideal for freezing climates </li></ul>
  • 8. <ul><li>Common hydrants </li></ul><ul><li>1. Dry barrel </li></ul><ul><li>Wet-top </li></ul><ul><li>Dry-top </li></ul><ul><li>2. Wet barrel </li></ul><ul><li>3. Warm climate </li></ul><ul><li>4. Flush </li></ul><ul><li>Wet-top hydrant: </li></ul><ul><li>-threaded end of operating rod and operating nut not sealed from water </li></ul>
  • 9. <ul><li>Common hydrants </li></ul><ul><li>1. Dry barrel </li></ul><ul><li>Wet-top </li></ul><ul><li>Dry-top </li></ul><ul><li>2. Wet barrel </li></ul><ul><li>3. Warm climate </li></ul><ul><li>4. Flush </li></ul><ul><li>Dry-top hydrant: </li></ul><ul><li>-threaded end of operating rod and operating nut are sealed from water </li></ul>
  • 10. <ul><li>Common hydrants </li></ul><ul><li>1. Dry barrel </li></ul><ul><li>Wet-top </li></ul><ul><li>Dry-top </li></ul><ul><li>2. Wet barrel </li></ul><ul><li>3. Warm climate </li></ul><ul><li>4. Flush </li></ul><ul><li>Wet barrel hydrant: </li></ul><ul><li>-no main valve </li></ul><ul><li>-always filled with water </li></ul><ul><li>-if broken, water will flow until repaired </li></ul><ul><li>Warm climate hydrant: </li></ul><ul><li>-lower barrel always full, under pressure </li></ul><ul><li>-no drain </li></ul>
  • 11. <ul><li>Common hydrants </li></ul><ul><li>1. Dry barrel </li></ul><ul><li>Wet-top </li></ul><ul><li>Dry-top </li></ul><ul><li>2. Wet barrel </li></ul><ul><li>3. Warm climate </li></ul><ul><li>4. Flush </li></ul><ul><li>Flush hydrant: </li></ul><ul><li>-below ground (flush) </li></ul><ul><li>-operating nut, nozzles in box w/ removable cover </li></ul><ul><li>-airports, pedestrain malls </li></ul>
  • 12. <ul><li>Dry hydrant main valves </li></ul><ul><li>1. Standard compression </li></ul><ul><li>2. Slide gate </li></ul><ul><li>3. Toggle </li></ul><ul><li>Standard compression: </li></ul><ul><li>-sealed by upward water pressure from main on valve seal ring </li></ul><ul><li>-turning operating stem pushes lower valve plate down--water comes up! </li></ul>
  • 13. <ul><li>Dry hydrant main valves </li></ul><ul><li>1. Standard compression </li></ul><ul><li>2. Slide gate </li></ul><ul><li>3. Toggle </li></ul><ul><li>Slide gate: </li></ul><ul><li>-simple gate valve </li></ul><ul><li>-turning operating stem raises gate--allowing water into lower barrel </li></ul>
  • 14. <ul><li>Dry hydrant main valves </li></ul><ul><li>1. Standard compression </li></ul><ul><li>2. Slide gate </li></ul><ul><li>3. Toggle </li></ul><ul><li>Toggle: </li></ul><ul><li>-valve opens horizontally </li></ul><ul><li>-operating arms sciscor and pull valve open </li></ul><ul><li>-lower barrel extends below connection to main </li></ul>
  • 15. opening fire hydrant valve
  • 16. <ul><li>Auxillary Valve </li></ul><ul><li>-should be installed on </li></ul><ul><li>every hydrant </li></ul><ul><li>-can turn individual hydrants </li></ul><ul><li>off for repair </li></ul><ul><li>-flanged connection common </li></ul>water main
  • 17. <ul><li>Breakaway hydrants </li></ul><ul><li>-”Traffic” design </li></ul><ul><li>-easier to repair if hit by vehicle </li></ul><ul><li>-two-part barrel with flanged coupling </li></ul><ul><li>-designed to break on impact avoiding damage below ground </li></ul><ul><li>-no excavation required </li></ul>
  • 18. <ul><li>Inspection and Installation </li></ul><ul><li>-inspect at time of delivery </li></ul><ul><li>operating nut: size, shape, turn orientation </li></ul><ul><li>outlet nozzle: size, config., thread dimensions </li></ul><ul><li>inlet connection: size, type, main valve size </li></ul><ul><li>-after inspection: </li></ul><ul><li>cycle full open/close </li></ul><ul><li>-storage: </li></ul><ul><li>indoors, no water entry </li></ul>
  • 19. <ul><li>Installation concerns </li></ul><ul><li>1. Location </li></ul><ul><li>2. Footing, blocking </li></ul><ul><li>3. Drainage </li></ul><ul><li>4. Color </li></ul><ul><li>Location: </li></ul><ul><li>-setback 2’ from curb (or further if no curb) </li></ul><ul><li>-pumper outlet faces street </li></ul><ul><li>-guard posts </li></ul>2’ setback auxillary valve Valve box pumper outlet
  • 20. <ul><li>Installation concerns </li></ul><ul><li>1. Location </li></ul><ul><li>2. Footing, blocking </li></ul><ul><li>3. Drainage </li></ul><ul><li>4. Color </li></ul><ul><li>Footing, blocking: </li></ul><ul><li>-firm footing (concrete slab) </li></ul><ul><li>-blocking keeps hydrant stable relative to main (in case of water hammer) </li></ul><ul><li>-tie hydrant valve to main </li></ul>thrust block 3/4” shackle rods (tie to main if blocking not possible) footing
  • 21. <ul><li>Installation concerns </li></ul><ul><li>1. Location </li></ul><ul><li>2. Footing, blocking </li></ul><ul><li>3. Drainage </li></ul><ul><li>4. Color </li></ul><ul><li>Drainage: </li></ul><ul><li>-1/3 yard drainage stone below hydrant and above drain </li></ul><ul><li>-put barrier above stone to prevent clogging with dirt </li></ul>clean drainage stone soil barrier
  • 22. <ul><li>Installation concerns </li></ul><ul><li>1. Location </li></ul><ul><li>2. Footing, blocking </li></ul><ul><li>3. Drainage </li></ul><ul><li>4. Color </li></ul><ul><li>Color: </li></ul><ul><li>-visible colors </li></ul><ul><li>-reflective paint </li></ul><ul><li>-color coding capacity </li></ul>
  • 23. <ul><li>Installation concerns </li></ul><ul><li>1. Location </li></ul><ul><li>2. Footing, blocking </li></ul><ul><li>3. Drainage </li></ul><ul><li>4. Color </li></ul>
  • 24. <ul><li>Hydrant Maintenance </li></ul><ul><li>-inspected annually, twice annually in cold climates </li></ul><ul><li>-make sure dry before winter (in freezing climates) </li></ul><ul><li>-keep electronic records </li></ul>
  • 25. End Chapter 9

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