Reference library
Fire protection reference tables
Structured lookup tables that support calculator setup and engineering checks.
Tables
8
Engineering lookup pages
Linked tools
30
Calculator library
Use
Setup
Inputs and screening checks
Page role
Use this page for a defined task before moving to the next project record.
- Audience
- Engineers, designers, reviewers, and technicians selecting calculator input values.
- Job
- Choose controlled lookup values before running a calculator or worksheet.
- Evidence
- Pipe material, K-factor, pipe schedule, fitting type, hazard class, AWG size, or field condition.
- Output
- A selected row or value retained with the calculation workpaper.
- Next
- Open the linked calculator that consumes the selected reference value.
How reference tables support the calculators
Use these tables to select C values, K-factors, internal pipe diameters, equivalent fitting lengths, density and area baselines, AWG resistance, and hazard classes before running a calculator.
Choose the controlled input table
Pick the reference table by the input field you are about to carry into a calculator or worksheet.
| Reference table | Controlled field | Use when | Downstream use | Open |
|---|---|---|---|---|
Hazen-Williams C Values for Fire Sprinkler Pipe Hazen-Williams C values pipe | Pipe Material / C Value | Use this table when a sprinkler hydraulic check needs a C value tied to pipe material, condition, and wet or dry system context. | Hazen-Williams Sprinkler Friction Loss Calculator, Sprinkler System Demand Calculator, NFPA 13 Hydraulic Design Worksheet | Open table |
Fire Sprinkler K-Factor Table sprinkler K-factor table | K-Factor / Typical Use | Use this table when a sprinkler discharge check needs the listed K-factor before solving flow, pressure, or minimum flow. | Sprinkler K-Factor Flow and Pressure Calculator, Sprinkler System Demand Calculator, NFPA 13 Hydraulic Design Worksheet | Open table |
Sprinkler Pipe Internal Diameter Reference pipe internal diameter schedule 10 40 | Nominal Size / Schedule 10 ID (in) | Use this table when a calculator needs internal diameter rather than nominal pipe size. | Hazen-Williams Sprinkler Friction Loss Calculator, Sprinkler Pipe Velocity Calculator, NFPA 13 Hydraulic Design Worksheet | Open table |
Equivalent Pipe Lengths for Common Fittings equivalent pipe length fittings NFPA 13 | Pipe Size / Fitting | Use this table when fittings need to be added to straight pipe length for a preliminary sprinkler friction-loss screen. | Equivalent Length Calculator for Sprinkler Fittings, Hazen-Williams Sprinkler Friction Loss Calculator, NFPA 13 Hydraulic Design Worksheet | Open table |
NFPA 13 Design Density and Area Reference NFPA 13 density area curve | Hazard Classification / Density (GPM/sq ft) | Use this table when a preliminary hazard class needs a paired density and design-area basis for demand screening. | NFPA 13 Density and Area Demand Calculator, Design Density Lookup Calculator, Hazard Classification and Density Setup Worksheet | Open table |
AWG Wire Resistance Table for Fire Alarm Circuits AWG wire resistance table | Wire Size / Ohms per 1000 ft | Use this table when fire alarm voltage drop or circuit resistance needs conductor resistance by AWG size. | Fire Alarm NAC Voltage Drop Calculator, Fire Alarm Wire Resistance Calculator, Fire Alarm Battery and NAC Worksheet | Open table |
Occupancy Hazard Classification Reference NFPA 13 occupancy hazard classification | Occupancy / Likely Hazard Class | Use this table to screen common occupancy examples before selecting a preliminary sprinkler hazard class. | Occupancy Hazard Classifier Calculator, Design Density Lookup Calculator, Hazard Classification and Density Setup Worksheet | Open table |
US Code Adoption and AHJ Checkpoints US fire code adoption AHJ checklist | Checkpoint / Why It Matters | Use this checklist at project intake before relying on any NFPA calculator, worksheet, or reference table. | Sprinkler System Demand Calculator, Fire Alarm Battery Capacity Calculator, Occupancy Hazard Classifier Calculator | Open table |
Tables
| Reference table | Lookup purpose | Used by | Open |
|---|---|---|---|
Hazen-Williams C Values for Fire Sprinkler Pipe Hazen-Williams C values pipe | Lookup common Hazen-Williams roughness coefficients for steel, copper, CPVC, cast iron, and dry-system sprinkler pipe materials. | 2 linked calculators | Open |
Fire Sprinkler K-Factor Table sprinkler K-factor table | Reference common sprinkler K-factor values used for quick flow and pressure checks in NFPA 13 style sprinkler calculations. | 2 linked calculators | Open |
Sprinkler Pipe Internal Diameter Reference pipe internal diameter schedule 10 40 | Compare typical Schedule 10 and Schedule 40 internal pipe diameters used in sprinkler hydraulic and velocity calculations. | 2 linked calculators | Open |
Equivalent Pipe Lengths for Common Fittings equivalent pipe length fittings NFPA 13 | Reference common equivalent length allowances for fittings when estimating sprinkler pipe friction loss and remote-area demand. | 2 linked calculators | Open |
NFPA 13 Design Density and Area Reference NFPA 13 density area curve | Lookup common density and design-area combinations for light, ordinary, and extra hazard sprinkler design screening. | 2 linked calculators | Open |
AWG Wire Resistance Table for Fire Alarm Circuits AWG wire resistance table | Lookup copper conductor resistance values for fire alarm NAC and SLC voltage drop calculations using common AWG sizes. | 2 linked calculators | Open |
Occupancy Hazard Classification Reference NFPA 13 occupancy hazard classification | Screen common occupancy examples against broad NFPA 13 hazard classes for early sprinkler design scoping and calculator setup. | 2 linked calculators | Open |
US Code Adoption and AHJ Checkpoints US fire code adoption AHJ checklist | Use this jurisdiction checklist before applying NFPA calculators on a United States project because adopted editions, local amendments, and AHJ direction can vary. | 3 linked calculators | Open |