Ch 91 - Sprinkler System Codes

Ch 91 - Sprinkler System Codes

Most Recently Revised: March 10, 1992
Fire Suppression Sprinkler System
[Adopted 3/88]

91-1. Installation required; plans to be submitted.

  1. In addition to the requirements of the NFPA 101 Life safety Codes and the BOCA Building Codes, this chapter shall augment or further require the installation of fire suppression sprinkler systems. Where any two (2) requirements conflict, the more restrictive shall apply.
  2. When sprinkler systems are required, two (2) complete sets of plans shall be submitted when applying for a building permit. Plans shall be reviewed and approved or denied by the Building Inspector. The Building Inspector shall review plans with the Fire Chief and approve or deny said plans within thirty (30) days of receipt.

91-2. Use Groups.

  1. Use Group A. Assembly buildings. All buildings and structures, or parts thereof, shall be in Use Group A, which are used for places of assembly, as defined in this chapter. Assembly-type uses with a total occupant load of less than fifty (50) shall be classified as Use Group B.
    1. Use Group A-1, theaters. Buildings of Use Group A-1 shall be further classified as described in Subsection A(2) and (3).
    2. Use Group A-1-A structures. This group shall include all theaters and other buildings used for the purpose of theatrica1- or operatic-type performances and exhibitions using a raised stage, proscenium-curtains, fixed or portable scenery loft, lights, projection booth or other theatrical accessories and provided with fixed seats.
    3. Use Group A-1-B structures. This group will include all theaters without a stage and equipped with fixed seats used for motion-picture performances.
    4. Use Group A-2 structures. This group will include all buildings and places of public assembly without theater stage accessories and shall be designed for use as dance halls, nightclubs and for similar purposes, including all rooms, halls and other spaces connected to the building with a common means of egress and entrance.
    5. Use Group A-3 structures. This use group shall include all buildings with or without an auditorium in which persons assemble for amusement, entertainment or recreation and dramatic presentations, lectures or other similar purposes without stage accessories, other than a raised platform, and to be used without permanent seating facilities, including art galleries, exhibit halls, museums, lecture halls, libraries, restaurants other than nightclubs, and recreation centers, and buildings designed for other similar assembly purposes, including terminals for passengers.
    6. Use Group A-4 structures. This use group will include all buildings used as churches, schools and similar educational and religious purposes.
    7. Use Group A-5 structures. This group will include grandstands, bleachers, stadiums, drive-in theaters, tents and similar structures for outdoor assembly use and shall comply with the provisions of this Article for special uses and occupancies.
  2. Use Group B, Business buildings. All buildings and structures, or parts thereof, shall be classified in Use Group B, which are used for the transaction of business, for the rendering of professional services or for other services that involve stocks of goods, wares or merchandise in limited quantities for use incidental to office or sample purposes, including, among others, offices, banks, civic centers, firehouses, outpatient clinics, police stations, professional services, testing laboratories, radio stations, telephone buildings, motor service stations and similar establishments.
  3. Use Group F, Factory and industrial buildings.
    1. All buildings and structures, or parts thereof, in which occupants are engaged in performing work or labor in the fabricating, assembling or processing of products or materials shall be classified in Use Group F, including among others, factories, assemblies, plants, industrial laboratories and all other industrial and manufacturing uses, except those of Use Group H involving highly combustible, flammable or explosive products and materials.
    2. Factories and industrial uses. The manufacturing processes listed in the following shall be indicative of and include the uses permitted in Use Group F buildings:
      • Bakeries
      • Boiler works
      • Breweries
      • Canneries, including food products
      • Condensed and powdered milk manufacture
      • Dry cleaning using other than flammable liquids in
      • cleaning or dyeing operations or other than
      • classified in Subsection D(2)
      • Electric light plants or powerhouses
      • Electrolytic-reducing works
      • Glass plants
      • Ice plants
      • Leather and tanneries
      • Woodworking facilities
      • Sugar refineries
      • Tenant factories, excluding ladies' dresses and other high-hazard uses
      • Textile mills, including canvas and cotton goods
      • Upholstery shops
      • Water pumping plants
  4. Use Group H, High-hazard buildings.
    1. In general, all buildings and structures, or parts thereof, shall be classified in Use Group H, which are used for the storage, manufacture or .processing of highly combustible or explosive products which are likely to burn with extreme rapidity or which could produce poisonous fumes, for storage or manufacturing which involves highly corrosive, toxic or noxious alkalies, acids or other chemicals producing flame, fumes or poisonous irritants or corrosive gases and for storage or manufacture of any materials producing explosive mixtures or spontaneous ignition.
    2. High-hazard uses. The processes, materials and manufactures listed in the following are indicative of and shall be classified as Use Group H:
      • Acetylene gas and gases under pressure of 15 pound gauge or more in quantities greater than 2,500 cubic feet, including hydrogen, ammonia, chlorine, sulfur, carbon monoxide, methyl oxide and all gases subject to explosion or toxic hazard
      • Ammunition and fireworks production
      • Artificial flowers manufacture
      • Cotton batting and cotton waste processes
      • Cotton dressmaking
      • Dry-cleaning businesses storing more than 3 gallons of gasoline or other hazardous liquids with a flash point of under 100 degrees F. or more than 60 gallons of flammable liquids with a flash point between 100 degrees F. and 140 degrees F. in a closed cup tester
      • Feather renovating
      • Fruit-ripening processes
      • Grain elevators
      • Hydrogenation processes
      • Industries using solids which ignite when coming in contact with water
      • Kerosene fuel or any oil storage with a flash point under 200 degrees F.
      • Match storage or manufacture
      • Paint and varnish manufacture
      • Paint spraying or dipping
      • Petroleum manufacture
      • Processing of paper goods
      • Refrigerating systems using high-hazard products
      • Smokehouses (commercial)
      • Straw goods manufacture
      • Tar or resin processing
      • Tire storage buildings
      • Wastepaper processing or storage
  5. Use Group I, Institutional buildings. All building and structures, or parts thereof, shall be classified in Use Group I, in which people suffering from physical limitations because of health or age are harbored for medical or other care or treatment, or in which people are detained for penal or correction purposes, or in which the liberty of the inmates is restricted.
    1. Use Group I-I structures. This use group shall include buildings housing six (6) or more individuals who, because of age, mental instability or other reasons, must live in a supervised environment but who are physically capable of responding to an emergency situation without personal assistance. Included in this group are uses such as facilities for children, aged person, mentally impaired and convalescents, including convalescent facilities, group homes, homes for the aged, mentally retarded care facilities, nursing homes (ambulatory), orphanages and residential care facilities. Occupancies such as the above with five (5) or less occupants shall be classified as a residential use group.
    2. Use Group 1-2 structures. This use group shall include all buildings used for housing people sUffering from physical limitations because of health or age, including, among others, day nurseries, hospitals, sanitariums, infirmaries, orphanages and homes for aged and infirm.
    3. Use Group 1-3 structures. This use group shall include all buildings designed for the detention of people under restraint, including, among others, jails, prisons, reformatories, insane asylums and similar uses.
  6. Use Group M, Mercantile buildings. All buildings and structures, and parts thereof, shall be classified in Use Group M, which are used for display and sale purposes involving stocks of goods, wares or merchandise intended for such purposes and are accessible to the pUblic, including retail stores, shops and salesrooms and markets. Highly combustible goods, such as merchandise made of pyroxylin products, shall be limited to small quantities that do not constitute a high hazard and, if not so limited, the con- struction shall comply with the requirements of Use Group H.
  7. Use Group R, Residential buildings. All buildings and structures, or parts thereof, shall be classified in Use Group R, in which families of households live or in which sleeping accommodations are provided for individuals with or without dining facilities, including those that are classified as institutional buildings.
    1. Use Group R-1 structures. This group shall include all hotels, motels and dormitory buildings arranged for the shelter and sleeping accommodations of more than twenty (20) individuals.
    2. Use Group R-2 structures. This group will include all multiple-family dwellings having more than two (2) dwelling units and shall also include all dormitories, boarding- and lodging houses arranged for the shelter and sleeping accommodations of more than two (2) and not more than twenty (20) individuals.
    3. Use Group R-3 structures. This group will include all detached one-and two-family units and their dwelling accessory structures.
  8. Use Group S, storage buildings.
    1. All buildings and structures, or parts thereof, shall be classified in Use Group S, which are used for the storage of goods, wares or merchandise, except those of Use Group H that involve highly combustible or explosive products including, warehouses, storehouses and freight depots.
    2. Moderate-hazard uses. Buildings used for the storage of moderate-hazard contents, which are likely to burn with moderate rapidity but which do not produce either poisonous gases, fumes or explosives, including the materials listed, shall be classified in Use Group S-l:
      • Bags, cloth, burlap and paper
      • Bamboo and rattan
      • Baskets
      • Belting, canvas and leather
      • Books
      • Boots and shoes
      • Buttons, cloth covered
      • Cardboard and cardboard boxes
      • Clothing, woolen
      • Furniture
      • Furs
      • Glue or paste
      • Linoleum
      • Livestock shelters
      • Lumberyards
      • Motor vehicle repair shops
      • Petroleum warehouses for storage of lubricating oils with a flash point of 200 degrees F. or higher
      • Public garages and stables
      • Silk
      • Soap
      • Sugar
      • Tobacco products
      • Upholstering and mattress manufacturing
      • Wax products and candles.
    3. Low-hazard uses. Buildings used for storage of noncombustible materials and of low-hazard wares that do not burn
      • rapidly shall be classified in Use Group S-2 unless otherwise classified, including, among others, the materials listed:
      • Asbestos
      • Chalk and crayons
      • Food products
      • Glass
      • Ivory
      • Metal
      • Porcelain and pottery
      • Public garages (Group 2)
      • Talc and soapstones

91-3. Installation and maintenance requirements. [Amended 3/92]

  1. Fire suppression systems shall be installed and maintained in full operating condition in accordance with the provisions of NFPA 13-1987, Standard for the Installation of Sprinkler systems.
  2. Sprinkler systems shall be installed in all new structures as indicated in this section or in existing structures undergoing alterations or expansion whereby the total cost for such alterations or expansion is fifty percent (50%) or larger of the most recent property and structure evaluation or whereby an occupancy changes from one use group to another or whereby alterations exceed fifty percent (50%) of the square footage of the structure, all floors included, therefore indicating that the more restrictive requirement shall apply.
    1. Use Group A-I. sprinkler systems shall be installed in all buildings or structures or portions thereof of Use Group AI.
    2. Use Group A-2. Sprinkler systems shall be installed in all buildings or structures or portions thereof of Use Group A2.
    3. Use Group A-3. sprinkler systems shall be installed in all buildings or structures or portions thereof of Use Group A3 with more than four thousand (4,000) square feet in area on all floors.
    4. Use Group A-4. Sprinkler systems shall be installed in all buildings or structures or portions thereof of Use Group A4 with a total area, including all floors, of more than four thousand (4,000) square feet or greater than two (2) stories in height.
    5. stages in Use Group A. Sprinkler systems shall be installed throughout stages of any size buildings of Use Group A as follows:
      1. Over the stage.
      2. Under the stage gridiron with sidewalk sprinkler heads rated as one hundred thirty-five (135) degrees Fahrenheit having heat baffle plates. The heads shall be installed around the entire perimeter of the stage, except above the proscenium opening as a point not more than thirty (30) inches below the gridiron nor more than six (6) inches below the baffle plate.
      3. Under all fly galleries.
      4. Under the stage.
      5. For all basements, cellars, workrooms, dressing rooms, storerooms and property rooms.
      6. In toilets, lounges and smoking rooms.
    6. Use Group H. Sprinkler systems shall be installed in all buildings or structures or parts thereof of Use Group H.
    7. Use Group I. Sprinkler systems shall be installed in all buildings or structures or parts thereof of Use Group I, except as follows:
      1. One-story day nurseries housing fifteen (15) children or less, with each room having an exit directly to the outside.
      2. Buildings of Use Group I-l having an occupant load of less than four (4).
    8. Use Groups M, B, Sand F. Sprinkler systems shall not be required in buildings or structures of Use Groups M, B, S and F provided the following requirements are met:
      1. Direct exits to the outside are provided as per the applicable BOCA National Building Code;
      2. The building or structure has an automatic fire alarm system per NFPA Code requirements; and
      3. The building does not exceed one story in height.
    9. Public Garages
      1. Sprinkler systems shall be installed in all public garages when there is:
        1. More than ten thousand (10,000) square feet in area.
        2. More than seven thousand five hundred (7, 500) square feet in area and more than one (1) story in height.
        3. More than five thousand (5,000) square feet in area and more than two (2) stories in height.
        4. More than three (3) stories in height.
        5. Located in buildings where the upper stories are designed for other uses.
        6. Located in any story that is more than fifty percent (50%) below grade.
      2. The exception shall be noncombustible open parking garages.
    10. Bus garages. Sprinkler systems shall be installed in all bus garages as follows:
      1. When used as passenger terminals for four (4) or more buses at one (1) time.
      2. When used for storage or loading of four (4) or more buses.
    11. Unlimited area buildings. Sprinkler systems shall be installed in unlimited area buildings as required. Indoor participation sports areas, such as tennis courts, skating rinks, swimming pools and equestrian clubs, may be unlimited in area and exempt from the automatic fire suppression system requirements, provided that the requirements of Subsection B(ll) (a) through (d) are met.
      1. Exits. Direct exits to the outside are provided for all the occupants of the recreation area.
      2. Posting. The recreation area is conspicuously posted as to use and occupant load.
      3. Fire alarm system. The building is equipped with a manual fire alarm system.
      4. Fire suppression. All other areas are equipped with an automatic fire suppression system.
    12. Storage and workshop areas.
      1. Sprinkler systems shall be installed in all portions of Use Groups A, B, I and R-2 occupied for storage, workshop or similar purposes.
      2. Exceptions shall be as follows: an individual store or workshop area located entirely within a dwelling unit.
    13. Use Group R.
      1. (a) Sprinkler systems shall be installed in all buildings or structures of Use Group R-1.
      2. (b) Exception. sprinkler systems shall not be required when each room or unit has its own exit to outside and when a structure is no more than one (1) story.
    14. Windowless story.
      1. Sprinkler systems shall be installed in every story, cellar or basement of all buildings where there is not provided at least twenty (20) square feet of opening entirely above the adjoining ground level in each fifty (50) linear feet or fraction thereof of exterior wall in the story, cellar or basement on at least one (1) side of the building. Openings shall have a minimum dimension of not less than twenty-two (22) inches. Such openings will be accessible to the Fire Department from the exterior and shall be unobstructed to allow fire-fighting and rescue operations from the outside.
      2. When openings in a story are provided on only one (1) side and the opposite wall of such story is more than seventy-five (75) feet from the openings, the story shall be provided with an approved automatic fire suppression system, or openings as specified above shall be provided on at least two (2) sides for the exterior walls of the story. If any portion of a basement or cellar is located more than seventy-five (75) feet from openings required in this section, the basement or cellar shall be provided with an approved fire suppression system.
      3. Exception; Use Group R-3.
    15. Painting rooms. Sprinkler systems shall be installed in spray painting booths, rooms or shops where painting, brushing, dipping or mixing is regularly conducted using flammable materials.
    16. Trash rooms and chutes. Sprinkler systems shall be installed in rooms or areas used for incinerations, trash and laundry collection or similar uses and at alternate floor levels and at the top of all chutes used in conjunction with these rooms or areas.
    17. Furnace rooms. Sprinkler systems shall be installed in furnace rooms, boiler rooms and rooms for similar uses. The exception shall be such rooms located entirely within and serving a single-dwelling unit.
    18. Alternate protection. In special use areas of buildings or structures, an alternate type of automatic suppression system may be installed when approved by the Fire Chief and Building Inspector if an automatic sprinkler system installation would be dangerous or hazardous to the specific use or occupancy.
    19. Use Group T, Temporary and miscellaneous uses. In general, structures and buildings of a temporary character and miscellaneous structures not classified in any specific use group shall be constructed, equipped and maintained to meet the requirements of this chapter commensurate with the fire and life hazard incidental to their use. Miscellaneous uses shall include all accessory buildings and structures used as private garages, sheds, fences and similar purposes.
    20. Doubtful use classification. When a building or structure is proposed for a use not specifically provided for in this chapter or the classification of which is doubtful, such building or structure shall be included in the use group which it most nearly resembles in respect to the existing or proposed life and fire hazard, and it shall be so classified by the Fire Chief and Building Inspector.
    21. Mixed use and occupancy.
      1. Two (2) or more uses. When a building is occupied for two (2) or more uses not included in the same use group, one (1) of the following shall apply:
        1. The provisions of this chapter applying to each use will apply to such parts of the building as come within that use group, and if there are conflicting provisions, the requirements securing the greater public safety shall apply to the entire building;
        2. The mixed uses shall be completely separated, both horizontally and vertically, by fire separation walls and floor/ceiling assemblies having a fire-resistance rating corresponding to the highest fire grading prescribed in Table 200 for the separate uses. Each part of the building will be separately classified as to use; or
        3. The mixed uses will be completely separated by fire walls having a fire-resistance rating corresponding to the highest fire grading prescribed in Table 200 for the separate uses. Each use group shall then comply with the provisions of this chapter applying to that group.
      2. Incidental uses. When the use is supplemental to the main use of the building and the area devoted to such use does not occupy more than ten percent (10%) of the area of any floor, the building shall be classified according to the main use. Where the incidental use is a higher hazard than the main use, it shall be constructed and segregated by fire-resistance rated construction as required in 91-3B(21) (a) .

91-4. Residential requirements.

  1. Fire suppression systems shall be installed and maintained in full operating condition in accordance with the provisions of NFPA 130-1984, Sprinkler Systems, One- and Two-Family Dwellings.
  2. Sprinkler systems shall be installed in all new structures as indicated in this section or in existing structures undergoing alterations or expansion whereby the total cost for such alterations or expansion are fifty percent (50%) or larger of the most recent property and structure evaluation or whereby occupancy changes from one use group to another or whereby alterations exceed fifty percent (50%) of the square footage of the structure, all floors included, therefore indicating that the more restrictive shall apply.
    1. Use Group R.
      1. Residential sprinkler systems shall be installed in all buildings or structures or portions thereof of Use Group R-2.
      2. Exceptions shall be as follows:
        1. Use Group R-3.
        2. Not required in Use Group R-2 when each room or unit has its own exit to the outside and when the structure is no more than one (1) story.

91-5. water supply requirements.

The amount of water required for sprinkler systems is as listed below. In all cases, the most restrictive requirement applies:

  1. Water supply required to be stored on site for systems installed as per 91-3 of this chapter in areas where municipal water service is not available:
    1. Supply for five (5) activated sprinkler heads for thirty (30) minutes duration.
    2. Supply twenty (20) gallons per minute per sprinkler head with at least fifty (50) pounds net head pressure at the operating sprinkler heads.
  2. Water supply required to be stored on site for systems installed as per 91-4 of this chapter in areas where municipal water service is not available:
    1. Supply five hundred (500) gallons for every three (3) units. Systems must be equipped with an automatic pump.
  3. Water supply for systems installed as per 91-3 or 91-4 of this chapter where municipal water is available:
    1. No supply required to be stored on site.
    2. The size of incoming water supply shall be as agreed upon by the Fire Chief and Building Inspector.
  4. In all cases, should municipal water supply become available to a new area, all sprinkler systems shall be attached to the municipal system if the sprinklered property has frontage on a street or road which obtains municipal water supply.

91-6. Modifications of requirements.

The specific requirements of this chapter may be modified by the Town of Conway Building Inspector or Fire Chief to allow alternative
arrangements that will secure as nearly equivalent safety to life from fire as practical, but in no case shall the modification afford less
safety to life than compliance with the provisions as set forth in 91-1 through 91-5.

91-7. Violations and penalties.

Any person, persons, firm, corporation or partnership who shall violate any provisions of this chapter or who shall fail to comply with any of the requirements thereof shall be guilty of a violation punishable by a fine of not less than one hundred dollars ($100) nor more than five hundred dollars ($500). Each day that a violation continues to exist shall constitute a separate offense.

Appendix A - Sprinkler System - Minimum Monthly Maintenance Program

  1. A visual inspection of all sprinklers to ensure against obstruction of spray should be included.
  2. An inspection of all valves to assure that they are open should be included.
  3. A test of all water flow devices should be included.
  4. The alarm system, if installed, should be tested.
  5. Pumps, where employed, should be test operated.
  6. The pressure of air used with dry systems should be checked.
  7. The water level in tanks should be checked.
  8. Care should be taken to see that sprinklers are not painted either at the time of installation or during subsequent redecoration. When painting sprinkler piping or painting in areas next to sprinklers, the sprinklers may be protected by covering with a bag, which should be removed immediately after painting has been finished.

Table 200 - Sprinkler System, Fire Grading of Use Groups

Sprinkler System
Table 200
Fire Grading of Use Groups
Use Group   Fire Grading (Hours)
A-1 Assembly, theaters 3
A-2 Assembly, nightclubs 3
A-3 Assembly, recreation centers, lecture halls, terminals, restaurants 2
A-4 Assembly, churches, schools 1-1/2
B Business 2
F Factory and industrial 3
H High-hazard 4
I-1 Institutional, restrained 3
I-2 Institutional, incapacitated 2
M Mercantile 3
R-l Residential, hotels 2
R-2 Residential, multifamily dwellings 1
S-l storage, moderate-hazard 3
S-2 Storage, low-hazard 2