Private Hydrant and/or Sprinkler Underground Piping Guideline per California Fire Code

Press Enter to show all options, press Tab go to next option


The purpose of this guide is to provide information necessary to ensure that the design and installation of private fire hydrant and/or fire sprinkler underground piping systems will comply with the applicable provisions of the 2013 California Fire and Building Codes, as amended.



This guideline is applicable to all privately owned fire hydrants and/or fire sprinkler underground piping systems. This guideline is not applicable to private underground piping systems serving residential fire sprinkler systems.


Requirements for Plan Submittal

A minimum of four (4) sets of plans for installation shall be approved by the City of Corona Fire Department, prior to installation.

Note:  Underground plans and overhead plans shall be submitted separately. 

Indicate the following in blue/black line print:

  1. Installation and/or design contractor’s name and address, state license classification and number.  Contractors may possess any of the following licenses:  A, C16, C34, C36 or a registered professional engineer (RPE)
  2. If the piping plan is designed by an RPE, it shall contain the license number and shall indicate who the installing contractor will be along with their license classification and state contractor’s license number.
  3. The locations of water mains, including pipe size and locations of public hydrants within 300 feet of the site.
  4. Location of all on-site piping, hydrant(s) and riser(s), sectional valve(s), OS&Y valve(s), and PI valve(s), as required.  Specify class, size and material of all piping and fittings.
  5. A water availability form shall be submitted with the underground plans.  The form shall be dated within six month of the submittal.
  6. Place the following notes (verbatim) on the piping plans:
    1. Prior to installation, required permits shall be secured from the Fire Department.
    2. Installation, inspection and testing shall conform to the 2013 edition of NFPA Standard 13 and the 2013 edition of NFPA Standard 24, as amended.
      1. The potable water supply shall be protected against backflow in accordance with Health & Safety Code Section 13114.7.  The location and type of control devices shall be approved by the Fire Department and the Department of Water and Power.
    3. Approved fire department connections (FDC) shall be located within 150’ of a public fire hydrant.  The FDC shall be oriented to face the fire department access road.  The FDC shall be properly supported and shall be protected against mechanical damage.  Fire department inlet connections shall be painted OSHA safety red.
    4. FDCs shall be on the address side of the building and located immediately   adjacent to the approved fire department access road. The FDC shall be in a position allowing hose lines to be readily and conveniently attached. The FDC shall contain a minimum of two (2) 2½” inlets. Sites containing public or private hydrants shall have FDCs with a minimum of two (2) 2½” inlets and two (2) 4” inlets to accommodate large diameter hose.  Specific configuration shall be determined by the Fire Code Official.
    5. Every sprinkler riser shall have a separate connection from the private fire main.
    6. Private fire hydrants shall meet City of Corona Water Standard 412, with a minimum of one (1) 2½” and one (1) 4” outlet.  Hydrant size and outlets shall be determined by the Fire Code Official. All outlets shall be provided with National Standard Threads (NST).  All fire hydrants shall be installed on a 6” riser.  4” outlet(s) shall face toward the fire department access roads Fire hydrants shall be located a minimum of 40’ from all structures.  A keyed gate valve shall be provided for each hydrant in an accessible location (valves shall not be located in parking stalls).  Super Hydrants Enhanced shall contain two (2) 4” outlets and one (1) 2½” outlet.
    7. Large private fire service main systems shall have post indicator type sectional controlling valves at appropriate points in order to permit sectionalizing the system in the event of a break, or for the making of repairs or extensions.
    8. All pipe shall be approved for use in “Fire Service Systems”, Class 150 minimum.  Class 200 shall be provided where the pressure exceeds 150 pounds per square inch (PSI).  All ferrous metal pipe shall be lined.  All ferrous pipe and fittings shall be protected with a loose 8-mil polyethylene tube.  The ends of the tubes shall be sealed with 2” tape approved for underground use.  All bolted joint accessories shall be cleaned and thoroughly coated with asphalt of other corrosion retarding material after assembly and prior to poly-tube installation.
    9. A six-inch bed of clean fill sand shall be provided both below and 12 inches above the pipe (total of 18” plus outer diameter of the piping).
    10. Pipe shall be center loaded with clean sand to prevent uplift during hydrostatic test.  All joints shall remain exposed.
    11. A minimum of 30” of cover from finished grade to top of pipe shall be provided above the pipe.  When surface loads are expected, a minimum of 36” of cover shall be provided.
    12. Listed and approved piping shall be installed under the building footings.  Adequate clearance shall be provided over pipe that runs under footings to prevent damage from building settling.  A minimum of 2” clearance (interstitial space) shall be provided where pipe passes through the floor or wall.  Underground piping serving fire sprinkler risers shall terminate within 18” of an exterior wall and 6” above finished floor.

      Note:  Underground piping serving fire sprinklers shall not terminate 5’ from the building.
    13. Thrust blocks or other approved method of thrust restraint shall be provided wherever pipe changes direction.
  7. The following additional notes pertaining to field inspection requirements shall also be placed (verbatim) on the plans:

Field Inspection Notes and Requirements

  1. A Fire Department final inspection is required. Contact the Corona Fire Department at (951) 736-2220, a minimum of 72 hours in advance, to schedule all inspections and tests (subject to availability).
  2. The trench shall be excavated for thrust blocks and inspected prior being covered.  All corrosion protection shall be in place.  Care shall be taken when forming and pouring thrust blocks that fittings and joints are not buried in concrete.
  3. A hydrostatic test (200 PSI pressure for 2 hours or 50 PSI over the maximum static pressure when it is over 150 PSI) shall be witnessed by an inspector before backfill and soil compaction.  The trench shall be backfilled between joints before testing to prevent movement of pipe.
  4. The system shall be connected to the city main and flushed thoroughly prior to connection to the overhead system.  Flow rate shall be a minimum of 10 ft./sec. through not less than 4 inch pipe or hose.  Approved equipment shall be provided by the contractor, to ensure safety.  The flush shall be witnessed by an inspector.
  5. Private fire hydrants, sprinkler control valves, detector check assemblies, post indicator valves and fire department connections shall be painted OSHA safety red.
  6. All control valves shall be provided with permanent signs that clearly indicate the building, system and function the valve serves.
  7. All fire sprinkler system control valves (including detector check assemblies), that control 20 or more fire sprinkler heads, shall be supervised by an approved Central Monitoring Station listed by UL, unless otherwise approved Corona Fire Department.


Revised 01/10/2014

Ask Ally Refresh


Powered by AboutXtreme