💧 FL Supply Pressure Loss Calculator

Hazen-Williams friction loss, velocity check (FPC max 8 fps), and booster pump sizing

FPC 604 + AWWA COMPLIANT

Pressure Calc

Velocity Check

FL Code

Quote

⚙️ Hazen-Williams Friction Loss

Pipe Material

C Factor Override

Nominal Pipe Size

Flow Rate (GPM)

Pipe Run Length (ft)

Equivalent Fitting Length (ft) — or use Fitting Adder below

Supply Pressure (psi)

Elevation Change (ft)

Minimum Fixture Pressure Required (psi)

Pressure Analysis

🔧 Fitting Equivalent Length Adder

Count your fittings — equivalent lengths added to pipe run for H-W calc

Total Equivalent Length Added 0 ft

📐 H-W Formula Reference

Hazen-Williams Friction Loss (psi per 100 ft):

hf = 0.2083 × (100/C)^1.852 × Q^1.852 / D^4.8655

Where: C = roughness coefficient, Q = flow (GPM), D = internal diameter (inches)

Velocity: v = Q / (2.449 × A) where A = π/4 × D²

Elevation correction: 1 psi = 2.31 ft of head

FPC limit: Max 8 ft/sec (FPC 604.8.1)

Min fixture pressure: 15 psi (FPC 604.5)

⚡ Multi-Pipe Velocity Check

FPC 604.8.1 — Maximum 8 fps velocity in supply piping. Exceeding this causes erosion, water hammer, and noise.

Flow Rate to Check (GPM)

Velocity by Pipe Size

💥 Water Hammer & Pressure Surge

Water Hammer Calculator

Flow Rate (GPM)

Pipe ID (inches)

Valve Close Time (sec)

Pipe Material

Pressure Surge Analysis

Water Hammer Prevention

• Air chambers: Vertical pipe stub ≥12" long, same size as supply pipe; install at each fixture

• Water hammer arrestors: ASSE 1010 certified; size A–F based on fixture count; install within 6 pipe diameters of solenoid valve

• Pressure reducing valve (PRV): FPC 604.8.2 — PRV required when supply exceeds 80 psi; set to 60–65 psi

• Slow-close valves: Eliminate most water hammer in residential systems; required on washing machines and dishwashers in many FL jurisdictions

• Expansion tank: Required in closed systems with PRV — FPC 607.3.4

📋 FPC Water Supply Pressure & Velocity

FPC Section 604 — Supply Pipe Sizing

FPC 604.3 — Water Service Pipe: Minimum ¾" pipe from street main to building shutoff. Minimum ½" for branches serving individual fixtures.

FPC 604.5 — Minimum Pressure: All plumbing fixtures shall have a minimum supply pressure of 15 psi at the point of use during peak demand conditions. Minimum 20 psi for flush valve closet tanks.

FPC 604.8 — Maximum Pressure: Supply pressure shall not exceed 80 psi at any point in the system. A pressure-reducing valve (PRV) shall be installed when street pressure exceeds 80 psi.

FPC 604.8.1 — Maximum Velocity: Water velocity in supply piping shall not exceed 8 ft/sec. Velocity greater than 8 fps causes erosion, noise, and water hammer. Design pipe size to stay below this limit.

FPC 604.9 — Booster Pumps: Where water pressure is insufficient to supply the minimum required flow, a booster pump shall be installed. Pump discharge to supply system requires a check valve and pressure tank.

FPC 604.10 — Pressure Reducing Valves: PRVs shall be set to deliver pressure not exceeding 60 psi downstream. Shall include a bypass if system requires higher pressure for fire suppression or industrial processes.

Florida Pipe Material — FPC Chapter 6

Approved cold water supply materials:

• Copper (Type K, L, M) — ASTM B88

• PEX-A, PEX-B, PEX-C — ASTM F876/F877 (no PEX in direct sunlight per FPC)

• CPVC — ASTM D2846 (domestic water) or ASTM F441 (SDR)

• PVC (cold water only, not hot) — ASTM D1785 Schedule 40/80

• Galvanized steel — ASTM A53 (existing systems only in FL — not permitted new)

HVHZ (Miami-Dade/Broward): All materials must be product-approval listed per FL Building Code 1714.5. PEX requires NOA in HVHZ counties — verify product listing before installation.

FL Utility Supply Pressure by County

County / Utility	Typical Static PSI	PRV Required?
Miami-Dade (WASD)	60–80 psi	Often yes
Broward (various munis)	55–75 psi	Sometimes
Palm Beach (PBCWUD)	60–80 psi	Often yes
Hillsborough (Tampa Water)	50–70 psi	Sometimes
Orange (OUC)	55–75 psi	Sometimes
Pinellas (Pinellas County Utilities)	45–65 psi	Rarely
Duval (JEA)	50–70 psi	Sometimes
Lee / Collier (wells common)	40–60 psi	Rarely
Sarasota / Manatee	50–70 psi	Sometimes
Volusia (DeLand / Daytona)	45–65 psi	Rarely
Brevard (Melbourne / Titusville)	40–60 psi	Rarely
Alachua (Gainesville / GRU)	50–65 psi	Sometimes
Leon (Tallahassee)	45–65 psi	Rarely

Pressure Loss Compliance Checklist

Static pressure verified at meter — within 15–80 psi FPC range FPC 604.5–604.8 — verify at peak demand, not static reading only

PRV installed if street pressure exceeds 80 psi FPC 604.8 — PRV set to ≤60 psi; expansion tank required in closed system (FPC 607.3.4)

Velocity at peak demand ≤8 fps in all supply branches FPC 604.8.1 — size pipe up if velocity exceeds limit; use H-W calculator to verify

Minimum 15 psi confirmed at farthest/highest fixture during peak flow FPC 604.5 — calculate total friction loss from meter to fixture; include elevation loss

Pipe material approved for FL building code and local AHJ FPC Chapter 6 — HVHZ (Miami-Dade/Broward) requires product-approval NOA for PEX

Water hammer arrestors installed at solenoid-operated fixtures ASSE 1010 certified; required at washing machine, dishwasher, quick-closing valves

Booster pump sized with proper tank and check valve (if needed) FPC 604.9 — diaphragm tank required; pump permit from local building department

Water service pipe minimum ¾" from meter to building FPC 604.3 — verify with utility — many FL utilities require 1" service for new single family

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Name Phone Email FL County Issue / Project Type Measured Pressure at Meter (psi) Pipe Material (if known) Additional Notes

📍 Serving all 67 FL counties | Licensed FL Plumbing Contractor | FL Lic. #CFC1234567

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