Pipe Schedule NFPA 13 Sizing

ZkDev

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About this app

Pipe schedule sizing for sprinkler systems per NFPA 13: how many sprinklers each pipe size may carry, for light and ordinary hazard occupancies.

WHAT IT CALCULATES
- Pipe size for branch lines, cross mains and feed mains
- Light hazard: 1 in = 2 sprinklers, 1-1/4 = 3, 1-1/2 = 5, 2 = 10, 2-1/2 = 30, 3 = 60, 3-1/2 = 100
- Ordinary hazard: 2-1/2 = 20, 3 = 40, 3-1/2 = 65, 4 = 100, 5 = 160, 6 = 275, 8 = 400
- One schedule applied to the whole system, the way the standard writes it
- Steel, copper and CPVC material options
- Method limits flagged, so you know when hydraulic calculation is required instead

CODE REFERENCES BUILT IN
- NFPA 13 sections 28.5.2 light hazard and 28.5.3 ordinary hazard, numbered 23.4 and 23.5 in older editions
- The 5000 sq ft area limit that caps the pipe schedule method

HOW IT WORKS
Enter hazard, material and the number of sprinklers on the section. You get the required pipe size and the limits that apply to the method.

CORE FEATURES
- Works 100 percent offline, no signal needed on site
- Calculation history you can reopen and reuse
- PDF export for submittals and field records
- Light and dark themes
- English and Spanish
- Material Design 3 interface

TYPICAL USES
- Checking a layout on site before the pipe goes up
- Verifying a contractor submittal during plan review
- Sizing during a bid walk without pulling the code book out of the truck
- Backing a field decision with a PDF you can attach to the job file
- Studying for NICET certification

WHAT THE PDF REPORT INCLUDES
- Every input you entered
- The calculated results with units
- Date and time of the calculation

OPTIONAL PRO UPGRADE - $2.99 ONE-TIME IN-APP PURCHASE
The following features require a separate one-time in-app purchase. They are not required to use the calculator:
- Unlimited saved calculation history
- PDF export of results
- Dark theme
- Ad-free experience

WHO IT IS FOR
- Fire protection engineers and system designers
- Sprinkler fitters and installers
- Fire inspectors and AHJ plan reviewers
- Contractors preparing bids and submittals
- NICET candidates and fire protection students

ACCURACY NOTE
Results are a design aid, not a stamped design. Verify against the edition of the standard adopted in your jurisdiction and confirm with the authority having jurisdiction.

Part of FireTools, the fire protection calculator collection. More tools at tradetools.dev/fire

What’s new

Added a link to TradeTools — the one-app version of this calculator and 61 more, for HVAC, electrical, plumbing, fire protection, solar and carpentry. Nothing else changed.