IL Fire Sprinkler cheat sheet

Light hazard density starts at 0.10 gpm/ft² over 1,500 ft²; ordinary Group 1 at 0.15 gpm/ft² over 1,500 ft²; ordinary Group 2 at 0.20 gpm/ft² over 1,500 ft² (NFPA 13 density/area curves).

Design area may be reduced per the density/area curve only when the system meets the qualifying criteria: wet system, no dry-pipe or sloped-ceiling penalty, and the calculated area minimum is not exceeded.

Minimum design area is 1,500 ft² for light and ordinary hazard; the area may be reduced up to 25% for quick-response sprinklers with a 1,500 ft² minimum floor, but not below the curve's lower limit.

Maximum sprinkler spacing: light hazard 15 ft (225 ft² per head), ordinary hazard 15 ft (130 ft² per head); minimum spacing is 6 ft unless baffles or a calculated design permits closer.

Sprinklers must be within 12 in of the ceiling, and deflectors must be within 1 to 12 in below combustible ceilings and 1 to 18 in below noncombustible ceilings, per NFPA 13 positioning rules.

Sprinkler coverage must extend to within 6 in of a wall in light hazard and within 12 in in ordinary hazard unless the wall is noncombustible and the area is otherwise protected.

A dry-pipe system requires a quick-opening device or an increased design area (30% increase) because water delivery time delays the effective discharge; dry systems in light hazard need a 30% area increase.

Hydraulic calculation requires the remote area to be the hydraulically most demanding, using the Hazen-Williams formula: head loss per foot = 4.52 × Q^1.85 / (C^1.85 × d^4.87), with C = 120 for steel pipe.

Sprinkler K-factor relates flow to pressure by Q = K√P; a K-5.6 head at 7 psi discharges about 14.8 gpm, and pressure at the most remote head must be at least 7 psi (7 psi minimum for standard spray).

NFPA 25 requires gauges on wet systems to be inspected monthly, and the main drain test annually (or after any supply change) to confirm the water supply and valve position.

Waterflow alarm devices must be tested quarterly for vane-type and pressure-switch types; a flow of at least the equivalent of one sprinkler (typically 10 gpm) must activate the alarm within 90 seconds.

Alarm and supervisory valves (OS&Y, PIV, post indicator) are inspected weekly/monthly for position; valve tamper switches are tested semiannually, and main control valves are operated annually.

Sprinkler heads are inspected annually from the floor level; heads showing corrosion, paint, physical damage, or loading must be replaced, and spare heads (at least 6, or a stock matching the system) must be maintained.

Dry-pipe and preaction systems require an annual trip test, plus a full-flow trip test every 3 years; the dry pipe valve must deliver water to the test outlet within 60 seconds.

The 5-year internal inspection of piping (or flushing) applies to systems with galvanized pipe, dry systems, and where conditions suggest obstruction; the 5-year requirement follows NFPA 25 Table 5.5.

Standpipe and hose systems: hose valves are inspected quarterly, and the 5-year hydrostatic test of the piping is required at 200 psi (or 50 psi above maximum pressure) for 2 hours.

Antifreeze systems require annual concentration testing; acceptable concentrations range from the minimum freeze protection to no more than 30% for propylene glycol and 40% for glycerin, and the solution must be replaced if out of range.

Illinois Fire Sprinkler Contractor Licensing Act (225 ILCS 317) requires any person or entity that designs, installs, repairs, alters, or maintains fire sprinkler systems to hold a state license issued by the Office of the State Fire Marshal (OSFM).

The license is issued to a business entity, and a designated responsible managing employee (RME) must hold a valid NICET Level III certification in water-based systems layout or an equivalent qualification.

Individual installers must be certified by the OSFM or hold NICET Level II; the contractor license number must appear on all bids, contracts, and permits.

License renewal occurs annually; the OSFM may require continuing education and the license is subject to discipline for code violations, fraud, or failure to maintain the RME.

Work performed without a license is a violation subject to civil penalties and cease-and-desist orders; local authorities may not issue permits to unlicensed contractors.

The contractor must notify the OSFM of any change in the RME within a specified period; loss of the RME without replacement can result in license suspension.

The Act authorizes the OSFM to adopt rules consistent with NFPA standards; the OSFM Fire Prevention Code (41 Ill. Adm. Code 141) incorporates NFPA 13, 13D, 13R, 14, 20, and 25 by reference.

Municipalities may adopt stricter local amendments, but a state-licensed contractor is still required; local permits and inspections do not substitute for state licensure.

NFPA 13 governs commercial, industrial, and large multi-family sprinkler design; NFPA 13R covers residential occupancies up to and including four stories; NFPA 13D covers one- and two-family dwellings and manufactured homes.

NFPA 14 covers standpipe and hose systems; NFPA 20 covers stationary fire pumps; NFPA 25 covers inspection, testing, and maintenance of water-based systems.

NFPA 13D requires at least one sprinkler in each dwelling and a minimum design of two sprinklers flowing simultaneously, with a 10-minute water supply duration and no more than 7 psi residual at the most remote head.

NFPA 13R permits omitting sprinklers in closets, bathrooms, and certain concealed spaces, but requires protection of attics with fuel-fired equipment and limits the design to four sprinklers flowing simultaneously.

The Illinois OSFM adopts the current editions of the referenced NFPA standards; the edition in effect is the one adopted by rule at the time of permit application, not necessarily the newest published edition.

NFPA 13 requires a water supply test (flow test) within the prior 12 months, or the use of a documented municipal supply curve; results must be adjusted for seasonal and daily fluctuations.

Plan review and approval by the OSFM or delegated local authority is required before installation; as-built drawings and hydraulic calculations must be submitted with the permit application.

NFPA 13 requires acceptance testing before the system is placed in service: hydrostatic test at 200 psi for 2 hours (or 50 psi above working pressure), plus flushing and flow testing of alarms and devices.