2015 sprinkler plan review presentation

7/20/2015

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Contact InformationJeffrey Mayers

Fire Safety Engineer

Georgia State Fire Marshal’s Office

404-617-8515

E-mail: [email protected]

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Goal of This Seminar:Components of a Sprinkler Plan Review

Tools the Reviewer Should Have Available Code References the Reviewer Should Have Available Items the Submitting Contractor Should Provide Establishing Jurisdiction - Should you be doing the Review? Project Types - How Each Should be Handled Key Elements of the Site Plan to Identify Sprinkler System Types Reviewing the Piping Plan & Reflected Ceiling PlanWater Flow Test Data - Introduction to GraphingWater Tank Details Fire Pump Details Hydraulic Calculations Completing the Review

Questions?

Questions that can be answered Immediately

Questions that will be answered as we go along

Questions that may require more in-depth explanation - after the seminar

Questions were you got me!

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Always Remember

As the Plan Reviewer, your job is NOT to design any sprinkler system

Your job is to check the submitted sprinkler system design for adherence to currently adopted codes

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Tools (Required)

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Colored Pens (or Pencils)

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Pencil and Eraser

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Dividers

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Calculator

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Tape Measure

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Architect Scale

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Engineer Scale

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Straight Edge

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Flexible Curve

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Tools (Optional)

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Required References

Document 120-3-3 - State Minimum Fire Safety StandardsNFPA 13 (2013 Edition) - Sprinkler System Installation CodeNFPA 13R (2013 Edition) - Res. Sprinkler System InstallationNFPA 14 (2013 Edition) - Installation of StandpipesNFPA 20 (2013 Edition) - Pumps for Fire ProtectionNFPA 22 (2013 Edition) - Water Tanks for Private Fire ProtectionNFPA 24 (2013 Edition) - Private Fire Service MainsNFPA 101 (2012 Edition) - Life Safety CodeIFC (2012 Edition) - International Fire Code

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Optional References

NFPA 25 (2011 Edition) - Inspection, Testing and Maintenance of Water Based Fire Protection Systems

NFPA 70 (2011 Edition) - National Electrical Code

NFPA 72 (2013 Edition) - National Fire Alarm Code

Document 120-3-19 - Georgia Fire Sprinkler Act

O.C.G.A Title 25

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Items the Submitting Contractor Should Provide

(Handout – List of Items)

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Establishing Jurisdiction

Should You be doing the Review?

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State JurisdictionRegardless of Location

HospitalsNursing HomesAmbulatory Surgical CentersState Owned or Occupied BuildingsJails

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Local JurisdictionRegardless of Building Size

Municipalities over 45,000 in populationUnincorporated areas of Counties over 100,000 in populationA Municipality or County not meeting either population requirement above has adopted a resolution with the State assuming local jurisdiction

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State JurisdictionBy Facility Type

Synopsis of O.C.G.A. Title 25-2-13(b)

(Handout Synopsis)

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Project TypesEither a New Construction or an Addition

Has Construction Permit already been Issued?

Life Safety plan review has already been done

If so, proceed with sprinkler plan review

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Project TypesExisting Building Undergoing Occupancy Change

Treat as a new building (O.C.G.A. 25-2-14: 1(d)) For purposes of this chapter, any existing building or structure listed in paragraph (1) of subsection (b) of Code Section 25-2-13 and which comes under the jurisdiction of the office of the Commissioner pursuant to Code Section 25-2-12 shall be deemed to be a proposed building in the event such building or structure is subject to substantial renovation, a fire or other hazard of serious consequence, or a change in the classification of occupancy. For purposes of this subsection, the term "substantial renovation" means any construction project involving exits or internal features of such building or structure costing more than the building's or structure's assessed value according to county tax records at the time of such renovation.

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Project Types

Renovation (Retrofit)

Proceed with sprinkler plan review

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Check for the Certificate of Competency Holder Signature

O.C.G.A. Section 25-11-9

(a) Water-based fire protection shop drawings shall be reviewed for code compliance with the state minimum standards by a certificate of competency holder.

(b) The reviewing certificate holder’s signature, printed name and certificate number indicating such compliance shall be indicated on the submitted plans.

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Key Elements of

The Site Plan

(Handout-Acronyms)

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Site Plan

Look For Water Flow Test Hydrant LocationsIs the drawing to Scale?Look for any Back Flow Prevention Device(s)

Note: this information will be needed for later use to analyze Hydraulic Calculations

(Full Size Drawing)

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(120-3-3 modification of International Fire Code, 2012 Edition, 507.5.1 Where required. Where a portion of the facility or building hereafter constructed or moved into or within the jurisdiction is more than 500 feet (152 m) from a hydrant on a fire apparatus access road, as measured by an approved route around the exterior of the facility or building, on-site fire hydrant mains shall be provided where required by the local Fire Chief and/or Fire Code Official of the responding fire department or agency. Exceptions: 1. For group R-3 and Group U occupancies, the distance requirement shall be 600 feet (183 m). 2. For buildings equipped throughout with an approved automatic sprinkler system installed in accordance with Section 903.3.1.1 or 903.3.1.2, the distance requirement shall be 600 feet (183 m).

(Full Size Drawing)

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Fire Hydrant Connections

If there is a hydrant installed at any location in the underground piping along the sprinkler supply main, then the size of the main shall be increased to at least 6” in diameter. 7.1.1 Hydrants shall be of an approved type and have not less than a 6 in. (152 mm) diameter connection with the mains.

(Full Size Drawing)

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Is there an indication on the site plan that the domestic water supply for this facility is tapped off of the dedicated fire line on the system side of the Backflow Prevention Device or the Fire Department connection (FDC)?

(Full Size Drawing)

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Piping Material Requirements

10.1.1 Listing. Piping shall be listed for fire protection service or shall comply with the standards in Table 10.1.1. [24:10.1.1]

(Full Size Drawing)

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Synopsis of Table 10.1.1

Ductile IronThickness Design of Ductile Iron Pipe AWWA C150Ductile Iron Pipe, Centrifugally Cast for Water AWWA C151SteelSteel Water Pipe 6 in. and Larger AWWA C200ConcreteReinforced Concrete Pressure Pipe, Steel-Cylinder Type AWWA C300Prestressed Concrete Pressure Pipe, Steel-Cylinder Type AWWA C301Reinforced Concrete Pressure Pipe, Non-Cylinder Type AWWA C302PlasticPolyvinyl Chloride (PVC) Pressure Pipe, 4 in. Through 12 in., forWater DistributionAWWA C900CopperSpecification for Seamless Copper Tube ASTM B 75

(Full Size Drawing)33

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Look for a Post Indicator Valve

(NFPA 13: 8.16.1.1.1.1) Each sprinkler system shall be provided with a listed indicating valve in an accessible location, so located as to control all automatic sources of water supply. (NFPA 13: 8.16.1.1.1.2) At least one listed indicating valve shall be installed in each source of water supply. (NFPA 13: 8.16.1.1.3.1) Where there is more than one source of water supply, a check valve shall be installed in each connection.

(Full Size Drawing)

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(NFPA 24: 6.2.11) All connections to private fire service mains for fire protection systems shall be arranged in accordance with one of the following so that they can be isolated: (1) A post indicator valve installed not less than 40 ft. (12 m) from the building (a) For buildings less than 40 ft. (12 m) in height, a post indicator valve shall be permitted to be installed closer than 40 ft. (12 m) but at least as far from the building as the height of the wall facing the post indicator valve. (2) A wall post indicator valve (3) An indicating valve in a pit, installed in accordance with Section 6.4. (4) A backflow preventer with at least one indicating valve not less than 40 ft. (12 m) from the building (a) For buildings less than 40 ft. (12 m) in height, a backflow preventer with at least one indicating valve shall be permitted to be installed closer than 40 ft. (12 m) but at least as far from the building as the height of the wall facing the backflow preventer.

(Full Size Drawing)

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(NFPA 13: 8.17.2.4.2) For single systems, the fire department connection shall be installed as follows: (1) Wet system—on the system side of system control, check, and alarm valves (see Figure A.8.16.1.1), (2) Dry system — between the system control valve and the dry pipe valve (3) Pre-action system — between the pre-action valve and the check valve on the system side of the pre-action valve (4) Deluge system — on the system side of the deluge valve (NFPA 13: 8.17.2.4.3) For multiple systems, the fire department connection shall be connected between the supply control valves and the system control valves. (NFPA 13: 8.17.2.4.4) The requirements of 8.17.2.4.2 and 8.17.2.4.3 shall not apply where the fire department connection is connected to the underground piping. (NFPA 13: 8.17.2.4.5) Where a fire department connection services only a portion of a building, a sign shall be attached indicating the portions of the building served. (120-3-3 modification of NFPA 13, 2013 Edition, Chapter 8. 17.2.4.6) FDC Locations. The location of fire department connections shall be approved by the Fire Chief as set forth in subsections 501.5 and 912 of the International Fire Code (IFC), as adopted by Chapter 120-3-3 of the Rules and Regulations of the Safety Fire Commissioner. Where there may be conflict between subsection 501 or 912 of the IFC and section 8.17.2 of this Code, the provisions of 501 and 912 of the IFC shall prevail.”

(Full Size Drawing)36

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(120-3-3 Modifications to NFPA 24)13.1.1 No pipe smaller than a nominal 8 inches (203 mm) in diameter shall be used to supply more than one hydrant or one hydrant on dead end mains over 500 feet (152 m). 13.1.2 No pipe smaller than a nominal 8 inches (203 mm) in diameter shall be used to supply one hydrant and automatic extinguishing systems. 13.1.3 No pipe smaller than a nominal 8 inches (203 mm) in diameter shall be used to supply more than one hydrant and automatic extinguishing systems on looped mains over 1,000 feet (305 m). A.13.1 Pipe sizing should be based upon good engineering practices based on the projected water demand, firefighting capabilities and water supply characteristics. Pipe sizes other than those specified in 13.1 may be acceptable in new or existing installations with the written approval of the authority having jurisdiction.”

(Full Size Drawing)

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Sprinkler System Types

(Handout – Riser Detail Drawing(s))

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Sprinkler System Types

Wet Hydraulically Calculated Pipe Schedule

Dry

Anti-FreezePre-Action

Deluge

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A Note on Antifreeze Systems

7.6.2.1* Except as permitted in 7.6.2.2, antifreeze solutions shall be listed for use in sprinkler systems.

Currently There are no listed antifreeze solutions

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System Riser Definition

3.5.12 System Riser. The aboveground horizontal or vertical pipe between the water supply and the mains (cross or feed) that contains a control valve (either directly or within its supply pipe), pressure gauge, drain, and a waterflow alarm device.

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If the sprinkler system is Wet

Look for a control valve on riser

Look for a water flow switch on riser


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If the sprinkler system is Dry

Look for a dry pipe valve on riser

Look for the total volume of the dry system


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If the system is a Dry system

Confirm that total sprinkler system volume does not exceed 500 Gal.

7.2.3.3 A system size of not more than 500 gal (1893 L) shall be permitted without a quick-opening device and shall not be required to meet any specific water delivery requirement to the inspection test connection.

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For Dry system volumes between 500 Gal. and 750 Gal.

7.2.3.4 A system size of not more than 750 gal (2839 L) shall be permitted with a quick-opening device and shall not be required to meet any specific water delivery requirement to the inspection test connection.

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For Dry Systems Exceeding 750 Gal in Volume

7.2.3.5 System size shall be based on dry pipe systems being calculated for water delivery in accordance with 7.2.3.6.

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8.2 System Protection Area Limitations.

8.2.1 The maximum floor area on any one floor to be protected by sprinklers supplied by any one sprinkler system riser or combined system riser shall be as follows:

(1) Light hazard — 52,000 ft2 (4831 m2)

(2) Ordinary hazard — 52,000 ft2 (4831 m2)

(3)*Extra hazard — Hydraulically calculated — 40,000 ft2

(3716 m2)

(4) Storage—High-piled storage (as defined in 3.9.1.17) and storage covered by other NFPA standards — 40,000 ft2 (3716 m2)

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Exercise

Determine the Minimum Number of Risers Required for the Following Light Hazard Building Configurations:

1-Story Building with an area of 32,000 ft2?2-Story Building with an area of 75,000 ft2 (40,000 ft2on 1st floor, 35,000 ft2 on second floor)?1-Story Building with an area of 182,000 ft2?

(Excercise – Determining Number of Risers)

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Does this building Require Standpipe(s)?

(IBC: 905.3.1) Height. Class III standpipe systems shall be installed throughout buildings where the floor level of the highest story is located more than 30 feet (9144 mm) above the lowest level of fire department vehicle access, or where the floor level of the lowest story is located more than 30 feet (9144 mm) below the highest level of fire department vehicle access.

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Exceptions:

Class I standpipes are allowed in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2.

Class I manual standpipes are allowed in open parking garages where the highest floor is located not more than 150 feet (45 720 mm) above the lowest level of fire department vehicle access.

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Class I Standpipe(s)

(NFPA 14: 5.4.1.1) Class I standpipe systems shall be permitted to be automatic dry, automatic wet, semiautomatic dry, manual dry, or manual wet in buildings not classified as high-rise buildings.

(NFPA 14: 3.3.15.5) Manual Wet Standpipe System. A standpipe system containing water at all times that relies exclusively on the fire department connection to supply the system demand.

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If Standpipe(s) are required

7.4 Number of Standpipes. Separate standpipes shall be provided in each required exit stairway.

7.5.1 Where two or more standpipes are installed in the same building or section of building, they shall be interconnected.

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The Hose Line Requirement for Stages

(NFPA 101: 12.4.5.12.1) Regular stages over 1000 ft2 (93 m2) in area and all legitimate stages shall be equipped with 11⁄2 in. (38 mm) hose lines for first aid fire-fighting at each side of the stage. 12.4.5.12.2 Hose connections shall be in accordance with NFPA 13, Standard for the Installation of Sprinkler Systems, unless Class II or Class III standpipes in accordance with NFPA 14, Standard for the Installation of Standpipe and Hose Systems, are used.

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Reviewing the Piping Plan & the Reflected Ceiling Plan

(Handout –Sprinkler Head Table )

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8.1.1* The requirements for spacing, location, and position of sprinklers shall be based on the following principles:

(1) Sprinklers shall be installed throughout the premises.

(2) Sprinklers shall be located so as not to exceed the maximum protection area per sprinkler.

(3)*Sprinklers shall be positioned and located so as to provide satisfactory performance with respect to activation time and distribution.

(4) Sprinklers shall be permitted to be omitted from areas specifically allowed by this standard.

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On Reflected Ceiling or Piping Plans: Identify all room designations

To determine which areas/rooms where sprinklers can be omitted

To determine the density of water that would be needed to be distributed in a fire situation (Hydraulics)

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Common Areas Where Sprinklers May be Omitted

8.15.8.1.1* Sprinklers shall not be required in bathrooms that are located within dwelling units of hotels and motels, that do not exceed 55 ft2 (5.1 m2) in area, and that have walls and ceilings of noncombustible or limited combustible materials with a 15-minute thermal barrier rating, including the walls and ceilings behind any shower enclosure or tub.

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8.15.8.2* Closets and Pantries. Sprinklers are not required in clothes closets, linen closets, and pantries within dwelling

units in hotels and motels where the area of the space does not exceed 24 ft2 (2.2 m2), the least dimension does not exceed 3 ft (0.9 m), and the walls and ceilings are surfaced with noncombustible or limited-combustible materials.

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8.15.9* Hospital Clothes Closets. Sprinklers shall not be required in clothes closets of patient sleeping rooms in hospitals where the area of the closet does not exceed 6 ft2 (0.55 m2), provided the distance from the sprinkler in the patient sleeping room to the back wall of the closet does not exceed the maximum distance permitted by 8.5.3.2.

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8.5.7.1 Sprinklers shall be permitted to be omitted from skylights not exceeding 32 ft2 (3 m2) in area, regardless of hazard classification, that are separated by at least 10 ft (3 m) horizontally from any other unprotected skylight or unprotected ceiling pocket.

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8.15.5.3 Automatic fire sprinklers shall not be required in elevator machine rooms, elevator machinery spaces, control spaces, or hoist ways of traction elevators installed in accordance with the applicable provisions in NFPA 101, or the applicable building code, where all of the following conditions are met:

(There are 5 conditions)61


8.15.11.3 Sprinklers shall not be required in electrical equipment rooms where all of the following conditions are met:(1) The room is dedicated to electrical equipment only.(2) Only dry-type electrical equipment is used.(3) Equipment is installed in a 2-hour fire-rated enclosure including protection for penetrations.(4) No combustible storage is permitted to be stored in the room.

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8.15.5.5* Upright, pendent, or sidewall spray sprinklers shall be installed at the top of elevator hoistways.

8.15.5.6 The sprinkler required at the top of the elevator hoistway by 8.15.5.5 shall not be required where the hoistway for passenger elevators is noncombustible or limited-combustible and the car enclosure materials meet the requirements of ASME A17.1, Safety Code for Elevators and Escalators.

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Common Areas Where Sprinklers Shall be Installed

8.15.5.1* Sidewall spray sprinklers shall be installed at the bottom of each elevator hoistway not more than 2 ft (0.61 m) above the floor of the pit.

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8.15.6.1 Unless the requirements of 8.15.6.2 are met, sprinklers shall be installed in spaces under all combustible ground floors and combustible exterior docks and platforms.

(There are 4 conditions listed on the next slide)

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8.15.6.2 Sprinklers shall be permitted to be omitted from spaces under ground floors, exterior docks, and platforms where all of the following conditions exist:

(1) The space is not accessible for storage purposes and is protected against accumulation of wind-borne debris.

(2) The space contains no equipment such as conveyors or fuel-fired heating units.

(3) The floor over the space is of tight construction.

(4) No combustible or flammable liquids or materials that under fire conditions would convert into combustible or flammable liquids are processed, handled, or stored on the floor above the space.

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8.15.3.2.1 In noncombustible stair shafts having noncombustible stairs with noncombustible or limited-combustible finishes, sprinklers shall be installed at the top of the shaft and under the first accessible landing above the bottom of the shaft.

8.15.3.2.3 Sprinklers shall be installed beneath landings or stairways where the area beneath is used for storage.

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Typical Coverage Areas for Sprinklers

Standard Coverage Sprinkler = 15 ft by 15 ft (225 ft2)

Extended Coverage Sprinkler = 20 ft by 20 ft (400 ft2)

Back to Back Sprinkler = 6 ft by 30 ft (180 ft2)

Note: Refer to Sprinkler Head Technical Data Sheetsfor Specialty Sprinkler Coverage Areas

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The Tedious Portion of the Review

(Handout: Piping Plan and Overhead Transparency)

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Small Rooms

3.3.21 Small Room. A compartment of light hazard occupancy classification having unobstructed construction and floor area not exceeding 800 ft2 (74.3 m2).

8.6.3.2.4.1 Sprinklers shall be permitted to be located not more than 9 ft (2.7 m) from any single wall.

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Sprinkler Installation Near Walls

8.6.3.3 Minimum Distances from Walls. Sprinklers shall be located a minimum of 4 in. (102 mm) from a wall.

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Sprinkler Head Interference

8.6.3.4.1 Unless the requirements of 8.6.3.4.2, 8.6.3.4.3, or 8.6.3.4.4 are met, sprinklers shall be spaced not less than 6 ft (1.8 m) on center.

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Areas Where Sprinkler Piping is Exposed to Outside Temperatures

Exposed piping needs to be A dry pipe system or dry loop within a wet system

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Locate the Dry System Inspector’s Test

(NFPA 13: 8.17.4.3.1) A trip test connection or manifold not less than 1 in. (25 mm) in diameter, terminating in a smooth bore corrosion resistant orifice, to provide a flow equivalent to one sprinkler of a type installed on the particular system, shall be installed. (NFPA 13: 8.17.4.3.2) The trip test connection or manifold shall be located on the end of the most distant sprinkler pipe in the upper story and shall be equipped with an accessible shutoff valve and a plug not less than 1 in. (25 mm), of which at least one shall be brass.

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Sprinkler System Hydraulics

Water Flow Test Data – Introduction to Graphing

LIFE SAFETY PLAN REVIEW COURSE - JULY 201175

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Water flow test data consists of gathering the static pressure , residual pressure, and water flow from an installed hydrant(s).

The location of the water flow test should be within the vicinity of the facility where the sprinkler system is to be installed.

This location is up to the reviewer’s engineering judgment.

This data is the single biggest constraint on the design of a sprinkler system.

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Water Flow Test Requirement

(120-3-3 modification of NFPA 13, 2013 Edition 24.2.2.3 A water test taken to determine the period of highest demand and made not more than six months prior to plan submittal shall be submitted to the authority having jurisdiction with all new system designs.

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How to Graph Water Flow Test Data

(Overhead Transparency : Hydraulic Graph Paper)(Handout : Hydraulic Graph Paper (5))

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Exercise

Graph the Following Water Flow Tests on the Hydraulic Graph Paper Provided:

Static Pressure = 60 psi, Residual Pressure = 20 psi, Flow = 600 GPM.Static Pressure = 60 psi, Residual Pressure = 40 psi, Flow = 700 GPM.Static Pressure = 73 Psi, Residual Pressure = 65 psi, Flow = 1190 GPM.

(Exercise – Graphing Water Flow Test Data)

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Water Tank Details

Water Tank Types

Elevated

Ground

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(NFPA 22: 11-2.2.1) Discharge pipe shall be a minimum 6".

(NFPA 22: 1-6.3) Building walls adjacent to water tank shall have a fire resistance rating of not less than two hours.


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The total volume of the tank is required for use in hydraulic calculations

If the tank is elevated, then the height of the bottom of the tank above the ground is also required.

Conversion from feet of water to psi: Multiply the height in feet by 0.433 to get the pressure at ground level due to tank elevation.

Quick Exercise: What would the pressure be at the bottom of an elevated tank located 90 ft above ground?

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Fire Pump Details

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A fire pump detail drawing should be included in the set of plans. (if necessary)

The performance curve of the fire pump should be provided.

A Fire Pump rating is the pressure boost the pump will provide at its stated 100% efficiency water flow. Example: a pump could be rated 80 psi @ 400 GPM.

(Handout – Fire Pump Performance Curve)

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(NFPA 13: 8.17.2.4.8) Fire Department Connections shall not be connected on the suction side of fire pumps.

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(NFPA 20: 4.27.3) Where located in the suction pipe of the pump, check valves and backflow prevention devices or assemblies shall be located a minimum of 10 pipe diameters from the pump suction flange.

Example: If a pipe suction flange is 5-inches in diameter, no Back Flow Prevention device or check valve can be within 50-inches of the flange.

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(NFPA 20: 6.2.1) Pumps shall furnish not less than 150 percent of rated capacity at not less than 65 percent of total rated head.

(NFPA 20: 6.2.2) The shutoff head shall not exceed 140 percent of rated head for any type pump.

(Handout – Exercise: Fire Pump Performance Requirements)

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The installed fire pump must meet the physical dimension requirements Per (NFPA 20: 4.26(a)) Summary of Centrifugal Fire Pump Data Table.

(Handout – Pump Data Table)

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How to Graph Pump Performance Curve Data

(Overhead Transparency)

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Exercise

Graph the fire pump rated 100 psi @ 500 GPM on the last blank sheet of Hydraulic Graph paper and on the Hydraulic Graph paper previously used to graph:

Static Pressure = 60 psi, Residual Pressure = 20 psi, Flow = 600 GPM.Static Pressure = 60 psi, Residual Pressure = 40 psi, Flow = 700 GPM.

(Exercise – Graphing Fire Pump Data)


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Hydraulic Calculations – A Graphical Approach

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The Four Basic Hydraulic Sprinkler System Water Supply Configurations

Municipal Water SupplyAn Elevated TankGround Tank with a Fire PumpMunicipal Water Supply Boosted By a Fire Pump

Note: All hydraulic calculations “must” be calculated back to the municipal water source.

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How to Graph The Municipal Water Supply Being Boosted by a Fire Pump

(Overhead Transparency)

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Exercise

Graph The Municipal Water Supply Being Boosted by the Fire Pump on the Hydraulic Graph paper previously used to graph:

Static Pressure = 60 psi, Residual Pressure = 20 psi, Flow = 600 GPM.Static Pressure = 60 psi, Residual Pressure = 40 psi, Flow = 700 GPM.

(Exercise – Graphing Municipal Water Boosted by a Fire Pump)

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Sprinkler Minimum Operating Pressure

(NFPA 13: 23.4.4.10.1) Minimum operating pressure of any sprinkler shall be 7 psi (0.5 bar). (NFPA 13: 23.4.4.10.2) Where a higher minimum operating pressure for the desired application is specified in the listing of the sprinkler, this higher pressure shall be required.

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(120-3-3 modifications to NFPA 13: 22.4.4.10.2) There shall be a minimum 10 psi (0.69 bar) cushion between the hydraulically calculated sprinkler system demand and supply when there is a backflow prevention device present. (120-3-3 modifications to NFPA 13: 22.4.4.10.2.1) The 10 psi (0.69 bar) cushion may be lowered to not less than 7 psi with written approval of the authority having jurisdiction based on the capability of the fire department to provide support to the system within 10 minutes of the receipt of notification of the alarm of fire in the building.

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(120-3-3 modifications to NFPA 13: 22.4.4.10.3) There shall be a minimum 15 psi (1.03 bar) cushion between the hydraulically calculated sprinkler system demand and supply in systems that do not have a backflow prevention device. (120-3-3 modifications to NFPA 13: 22.4.4.10.3.1) The 15 psi (1.05 bar) cushion may be lowered to not less than 7 psi with approval of the authority having jurisdiction based on the capability of the fire department to provide support to the system within 10 minutes of the receipt of notification of the alarm of fire in the building

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(120-3-3 Modification to NFPA 20 4.6.2.3.1) At 150% rated capacity or below, the pump suction supply shall not drop below 20 psi.

4.6.2.3.1 Where the maximum flow available from the water supply cannot provide a flow of 150 percent of the rated flow of the pump, but the water supply can provide the greater of 100 percent of rated flow or the maximum flow demand of the fire protection system(s), the water supply shall be deemed to be adequate. In this case, the maximum flow shall be considered the highest flow that the water supply can achieve.

4.6.2.3.2 Where the water supply cannot provide 150 percent of the rated flow of the pump, a placard shall be placed in the pump room indicating the minimum suction pressure that the fire pump is allowed to be tested at and also indicating the required flow rate.

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Components of Submitted Hydraulic Calculations

Cover SheetNode Analysis Sheet(s)Path Calculations (to Source)Data Graph(s)

(Handout – Remote Area and Node Analysis)

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How to Evaluate the Submitted Hydraulic Calculations

Determine Hydraulic Sprinkler System Water Supply ConfigurationIdentify the Source Point of the CalculationsExamine Calculations along with the Drawings to confirm they go to the Source PointDetermine if the remote area calculated is the most remote area and/or the most hydraulically demanding area for the system

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Determine from the Node Analysis

All sprinkler heads identified in the remote area are shown as flowingCorrect “K” factor used for each nodeMinimum Activation Pressure shown for each headCheck the math for each head

(Pressure=(Flow/”K” factor)2

(Continued on Next Slide)

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Determine from the Node Analysis (Cont.)

Check Water Density Based on Hazard Table for area covered by flowSum all flowing headsAdd required hose allowance (If necessary)Graph results on your hydraulic graph paperConfirm that the required pressure cushion is met

(Overhead Transparency: Hydraulic Nodes)

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Exercise: Confirm the Node Analysis for the Remote Area Provided

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Completing the Review

Items to Retain for Permanent RecordItems to Retain for Your FilesItems to Return to Contractor

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Items to Retain for Permanent Record

Stamped Sprinkler Plan Drawings (1-copy)

Comments

Hydraulic Calculations

105

7/20/2015

36

Items to Retain for Your Files

Comments

Scratch work and notes

Correspondence

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Items to Return to Contractor

Stamped Sprinkler Plan DrawingsComments80% Inspection Form100% Inspection FormSite Supervision FormContractor’s Cert. Form for UndergroundContractor’s Cert. Form for Above GroundTechnical DataHydraulic Calculations

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Contact InformationJeffrey Mayers

Fire Safety Engineer

Georgia State Fire Marshal’s Office

404-617-8515

E-mail: [email protected]

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2015 sprinkler plan review presentation

Documents