2019 California Residential Code (CRC)
2019 California Plumbing Code (CPC)
2019 California Mechanical Code (CMC)
2019 California Electrical Code (CEC)

2019 California Fire Code (CFC)
NFPA 13, 13D, 13R
Town Ordinances and State Laws
Mammoth Lakes Fire Protection District Ordinance


The Mammoth Lakes Fire Protection District prefers to utilize a paperless plan review and permitting process. All applications, including plans and technical documents, may be submitted in digital format via any of the following methods: (1) PDF emailed to, (2) Dropbox or Google Drive link emailed to, or (3) USB flash drive or CD delivered to the Prevention Division during regular business hours at Station 1, 3150 Main Street, Mammoth Lakes.


Please make sure your application packet is complete prior to submitting.

The installation of, work, or repair on any fire sprinkler system must be conducted by a California State Fire Marshal certificated technician and possess a C-16 certification.

1. General Information (Cover Sheet):

Project name, address, Assessor Parcel Number (APN), project owner's name, address and phone number, and name, title, address and phone number of design professional.

List of current applicable codes.

Occupancy group(s) and type of construction.

Gross square footage for each separate occupancy classification.

Detailed description of scope of work.

Plans that are signed and dated by the design professional. If the installation contractor is not the system designer, the plans will be required to be stamped and signed by the licensed system design engineer.

Index of drawings with numbered pages.

NOTE: It is not advisable to have any type of wet piping system installed if piping is required on the exterior of the building or the building is unoccupied and can not maintain a temperature above freezing. The Mammoth Lakes Fire Protection District requires sprinkler systems to be protected to -30 degrees F.

2. Information Required on the Fire Sprinkler Design

North arrow.

Type of system noted:

Hydraulic calculation

Pipe schedule







2019 NFPA 13, 13D or 13R code compliant plan design.

Site plan to scale, showing the underground pipe size, location, water meter size and connection point to the city main.

A complete set of piping plans drawn to scale indicating location of sprinkler heads and room descriptions.

The location of partitions, fire rated walls and building elevation views.

All water supply valves and flow switches.

Termination of all sprinkler drains.

Auxiliary drain location and size.

Type and location of hangers, sleeves and brace details showing all components and attachment devices.

A building cross section showing sprinkler system components and building construction.

A system riser detail showing all valves and devices (no shut-off devices shall be installed on the system side).

A detailed fire department connection on the street side of the building which, when connected to the water supply, does not obstruct emergency access.

Hydraulic calculations.

Location of the exterior sprinkler bell or exterior horn/strobe device.

Local water flow alarm located above the fire department connection (if applicable).

Sprinkler head symbols which include manufacturer, mode, K-factor, orifice size and temperature.

Provide pipe hanger spacing.

Provide seismic protection details (flexible couplings, seismic separation, proper pipe clearance noted on the plans for pipe penetrations, etc).

Type of piping being used in all areas (system piping, riser piping and underground piping).

Specify the calculation method used, density area or room design.

Reference points in the calculation worksheet should match points on the plans, and occupancy hazard classifications should be appropriate for occupancy use.

Any use of quick response sprinklers in a design area should meet design specifics.

Sprinkler head information should match information on the plans.

Calculations are correct for static PSI, pipe length, GPM, K for drops or branch lines, evaluation data, hose allowance, friction loss, pipe and fitting lengths.

Calculations are provided for extra hazard occupancies, deluge, exposure and in-rack systems.

A minimum of 2 summary calculations is provided for a grip system.

Water flow information is provided with static PSI, residual PSI, and available GPM at 20 PSI with graphed results.

Pipe size and length references in the calculation worksheet should match the plans.

If design area adjustments are made, the adjustment methodology should be provided.

Calculations for a single and for a multiple spinkler discharge.

A calucation design based on the 4 most demanding spinklers at the minimum list flow rate or 0.10 gpm/ft. (residental).

Wet Sytem:

Relief valve of not less than ¼ ich should be detailed for gridded system.

Alarm connection of not less than 1 inch discharging to the exterior should be provided to test the waterflow alarm.

Dry System:

Only upright, listed dry sprinklers should be used. Exceptions will be made for return bends and sidewall sprinklers.

System capacity should be provided.

System should be designed to meet the water delivery times for the hazard classification.

Compressor capacity specification sheet should be provided, which shows system restoration is possible within 30 minutes.

The location for the quick opening device (QOD) for systems greater than 500 gallons should be displayed.

The location of the check valve for QOD and the antiflooding device betweenthe riser and the QOD should be displayed.

Compressor piping systems with air fill lines not less than ½ inch, and check-relief-shutoff valves should be displayed.

A trip test connection with a shut-off valve and at least a 1 inch plug should be at the furthermost sprinkler pipe.

Only one dry pipe valve is permitted for any system that has less than a 750 gallon capacity.