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Home > Fire Sprinklers > Laws, Codes & Standards > Maine Life Safety Standard

The Maine Life Safety Standard (2012 Revision)

"A state-fabricated fire sprinkler system standard "

 

 

DEPARTMENT OF PUBLIC SAFETY (Agency #16)

OFFICE OF STATE FIRE MARSHAL (Bureau #219)

THE MAINE LIFE SAFETY STANDARD

                                    FOR THE INSTALLATION OF SPRINKLER SYSTEMS (2012 Revision)

CONTENTS

                  Preface……………………………………………………………………………….....................................………..….2

Section 1    General Information........................................................................................................ 3

            1.1       Scope........................................................................................................................ 3

            1.2       Levels of Protection................................................................................................... 4

            1.3       Purpose..................................................................................................................... 6

            1.4       Definitions................................................................................................................. 6

Section 2    Installation...................................................................................................................... 9

            2.1       Devices and Materials............................................................................................... 9

            2.2       Acceptance Tests...................................................................................................... 9

Section 3    Water Supply................................................................................................................ 10

            3.1       General Provisions................................................................................................... 10

            3.2       Water Supply Sources............................................................................................. 10

            3.3       Combined Piping Systems....................................................................................... 10

            3.4       Water Utility............................................................................................................ 11

Section 4    System Components..................................................................................................... 12

            4.1       Valves and Drains................................................................................................... 12

            4.2       Pipe and Fittings..................................................................................................... 12

            4.3       Piping Support......................................................................................................... 12

            4.4       Sprinklers................................................................................................................ 12

            4.5       Alarms..................................................................................................................... 13

            4.6       Spare Sprinklers...................................................................................................... 13

            4.7       Fire Department Connection.................................................................................... 13

            4.8       Electrical Wiring........................................................................................................ 13

            4.9       Electrical Supervision/Pump Motor........................................................................... 13

Section 5    System Design............................................................................................................... 14

            5.1       Design Criteria......................................................................................................... 14

            5.2       System Types Allowed............................................................................................. 15

            5.3       Pipe Sizing............................................................................................................... 15

            5.4       Piping Configurations.............................................................................................. 15

            5.5       Location of Sprinklers.............................................................................................. 15

            5.6       Drawings and Calculations...................................................................................... 16

Section 6    Maintenance................................................................................................................. 17

PREFACE

The intent of this design guide is to define an alternative sprinkler system installation which offers an enhanced level of life-safety to occupants evacuating a structure during the first minutes of a detected fire. The system design is not primarily intended to adequately protect the structure itself from fire loss or damage. A complete sprinkler system designed and installed in accordance with NFPA #13 may offer superior protection to the structure and contents.

Before installing a Maine Life Safety fire sprinkler system, be sure to check with your insurance carrier to confirm that they will recognize this standar dor the same discounts that apply to other fire sprinkler system standards.

 

NOTE:         [Text in italicized brackets like this is explanatory material]

 

SECTION 1    GENERAL INFORMATION

            1.1       Scope

                       This standard deals with the alternative design and installation of automatic sprinkler systems as permitted by the Office of State Fire Marshal.

                        1.1.1    The sprinkler system herein described is an alternative design subject to permission for its use by a licensed Responsible Managing Supervisor who is the acting “authority having jurisdiction” for the Office of State Fire Marshal exclusively. The system will ordinarily be permitted in buildings up to and including four stories in height, where the cost of the fire sprinkler system installed according to the applicable nationally-adopted fire sprinkler standard would clearly create an undue economic burden relative to the overall cost of the project and where property protection is not an issue.  This standard is not intended for new, large, expensive projects, (such as but not limited to those over a million dollars in building construction cost).  It is also not intended for any extra hazard use or any high-piled storage use.  Projects considered for using this standard are those which meet the criteria of this paragraph and that fall into one of the following categories where the hazard definitions are those of NFPA 13:

                                    (1) existing buildings with rehabilitation work as defined by NFPA 101 that are also light hazard occupancies,

                                    (2) existing buildings with change-of-use where the new use will be light hazard occupancy,

                                    (3) existing mixed-use occupancies that have a significant portion as light hazard occupancy use,

                                    (4) new light hazard occupancies that are not required to have fire sprinkler protection,

                                    (5) new light hazard occupancies,

                                    (6) existing buildings to be used as ordinary hazard 1 occupancies that do not exceed 9,000 sq ft,

                                    (7) new ordinary hazard 1 occupancies that do not exceed 4,500 sq ft,

                                    (8) existing buildings to be used as ordinary hazard 2 occupancies that do not exceed 6,000 sq ft,

                                    (9) new ordinary hazard 2 occupancies that do not exceed 3,000 sq ft,

                                    (10) ordinary hazard 1 or ordinary hazard 2 occupancies of larger size with more stringent design criteria as approved by a licensed Responsible Managing Supervisor who is the acting “authority having jurisdiction” for the Office of State Fire Marshal.

                                    (11) buildings of temporary use.

                                    (12) buildings where it is known that within approximately 2 years the water supply will be improved enough to support an adopted national fire sprinkler standard, at which time the fire sprinkler system will be converted to that standard.

                        1.1.2    It is advisable to obtain permission for the use of the sprinkler system described herein directly from the Office of State Fire Marshal prior to preparation of plans and hydraulic calculations.

            1.2       Levels of Protection

                        1.2.1    There are various levels of fire safety available to dwelling occupants to provide life safety and property protection.

                                    This standard recommends, but does not require, sprinklering of all areas in a dwelling; it permits sprinklers to be omitted in certain areas. These areas are the ones shown by NFPA statistics (see following table A-1-3) to be the ones where the incidence of life loss from fires in dwellings is low. Such an approach produces a reasonable degree of fire safety. Greater protection to both life and property may be achieved by sprinklering all areas.

                        1.2.2    This standard assumes that one or more smoke detectors will be installed where required by NFPA 101, NFPA 1, or the Maine Uniform Building and Energy Code in accordance with the appropriate standard for the installation, maintenance and use of fire warning equipment.

Table A.1.3

Casual Factors in One- and Two-Family Dwelling Fires Which Caused One or More Deaths

                                                                            Area of Origin

            Living Room                                                  41%

            Bedroom                                                        27%

            Kitchen                                                           15%                     Based on 6066 incidents

            Storage Area                                                     4%                     where area of origin was

            Heating Equipment Room                                3%                     reported

            Structural Area                                                 2%

            Other Areas                                                      8%

            Form of Material

            Furniture                                                         27%

            Bedding                                                          18%

            Combustible Liquid or Gas                             13%

            Interior Finish                                                   9%

            Structural Member                                            9%                     Based on 5080 incidents

            Waste, Rubbish                                                4%                     where form of material

            Clothing, on a Person                                       3%                     ignited was reported

            Cooking Materials                                            3%

            Electrical Insulation                                          2%

            Curtains, Drapery                                             2%

            Other                                                              10%

            Form of Heat Ignition

            Smoking Materials                                          36%

            Heat from Fuel - Fire or Powered Object        25%

            Heat from Miscellaneous Open                      15%                     Based on 5016 incidents

                  Flame (Including Match)                                                       where form of heat

            Heat from Electrical Equipment                     14%                     ignition was reported

            Arcing or Overload

            Hot Objects Including Properly                        7%

                  Operating Electrical Equipment

            Other                                                                3%

            Total number of incidents reported             10,194

            Source: FIDO Data Base 1973 to 1982. NFPA Fire Analysis Dept.

            1.3       Purpose

                        1.3.1    The purpose of this standard is to provide a sprinkler system that will aid in the detection and control of fires in occupancies where the quantity and/or combustibility of contents is low and where fires with relatively low rates of heat release are expected, An operating sprinkler system installed in accordance with this standard is expected to prevent flashover (total involvement) in the room of fire origin, and increase the chances for occupants to escape or to be evacuated.

            1.4       Definitions

                        Approved. Acceptable to the "authority having jurisdiction."

                        Authority Having Jurisdiction. The licensed Responsible Managing Supervisor acting for the Office of State Fire Marshal shall be the authority having jurisdiction.

                        Backflow Prevention Device. A device that does not allow liquid to flow back to the supply and thus cause contamination.

                        Check Valve. A valve that allows flow in one direction only.

                        Compartment. A space completely enclosed by walls and a ceiling. The compartment enclosure is permitted to have openings in walls to an adjoining space if the openings have a minimum lintel depth of 8 inches from the ceiling and the openings do not exceed 8 feet in width. A single opening of 36 inches or less in width without a lintel is permitted when there are no other openings to adjoining spaces.

                        Control Valve. A valve employed to control (shut off or turn on) a supply of water to a sprinkler system.

                                    NOTE: System control valves shall be of the indicating type, such as plug valves, ball valves, butterfly valves, or OS and Y valves.

                        Density. The quantity of water discharged by automatic sprinklers over a specific area expressed as gallons per minute per square foot (gpm/ft²).

                        Design Area. An area expressed in sq. ft. having a number of sprinklers, all flowing at or above the minimum required application rate.

                        Fire Department Connection. A threaded inlet connection located on the exterior of a building, arranged to enable the Fire Department to pressurize and supply the sprinkler system, bypassing the system control valves and supply main.

                        Fuel-fired equipment. Devices that use oil, natural gas, propane, kerosene, diesel, wood, or coal as an energy source at the device.  Electrical, mechanical, solar and/or hydraulic-powered devices are not considered to be fuel-fired equipment.

                        Labeled. Equipment or materials which has attached a label, symbol or other identifying mark of an organization acceptable to the "authority having jurisdiction" and concerned with product evaluation, that maintains periodic inspection of production of labeled equipment or materials and by whose labeling the manufacturer indicates compliance with appropriate standards or performance in a specified manner.

                        Listed. Equipment or materials included in a list published by an organization acceptable to the "authority having jurisdiction" and concerned with product evaluation, that maintains periodic inspection of production of listed equipment or material and whose listing states either that the equipment or material meets appropriate standards or has been tested and found suitable for use in a specified manner.

                                    NOTE: The means used for identifying listed equipment may vary for each organization concerned with product evaluation, some of which do not recognize equipment as listed unless it is also labeled. The "authority having jurisdiction" should utilize the system employed by the listing organization to identify a listed product.

                        NFPA 13. The edition of National Fire Protection Association #13, Standard for the Installation of Sprinkler Systems that is currently adopted by the Office of State Fire Marshal.

                        NFPA 20. The edition of National Fire Protection Association #20, Standard for the Installation of Stationary Pumps for Fire Protection that is currently adopted by the Office of State Fire Marshal.

                        NFPA 22.  The edition of National Fire Protection Association #22, Standard for Water Tanks for Private Fire Protection that is currently adopted by the Office of State Fire Marshal.

                        NFPA 25. The edition of National Fire Protection Association #25 Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems that is currently adopted by the Office of State Fire Marshal.

                        NFPA 101. The edition of National Fire Protection Association #101 Life Safety Code that is currently adopted by the Office of State Fire Marshal.

                        Pre-engineered System. A packaged sprinkler system including all components, designed to be installed according to pretested limitations.

                        Pump. A mechanical device that transfers and/or raises the pressure of a fluid (water).

                        Residential Sprinkler Head. An automatic sprinkler specifically listed for use in residential occupancies.

                  Responsible Managing Supervisor.  A person licensed or certified by the State as qualified to determine whether the plan and installation of fire sprinkler systems meet the standards provided by law, rule, and regulation.

                        Shall. Indicates a mandatory requirement.

                        Should. Indicates a recommendation or that which is advised but not required.

                        Small Pump Policy.  The guidelines and requirements of the Office of State Fire Marshal for small pumps of  fire sprinkler systems, including their power supplies, controller panels, test headers and other small pump related issues. This policy is available under “Fire Sprinklers” at www.mainefiremarshal.com.

                        Sprinkler-Automatic. A fire suppression device which operates automatically when its heat actuated element is heated to or above its thermal rating, allowing water to discharge over a specific area.

                        Sprinkler System. An integrated system of piping connected to a water supply, with listed sprinklers which automatically initiate water discharge over a fire area. This Design Guide requires sprinkler systems to include a control valve and a device for actuating an alarm upon system operation.

                        Standard. A document containing only mandatory provisions using the word "shall" to include requirements. Explanatory material may be included only in the form of "fine print", italic notes, footnotes, or in appendix.

                        Supply Pressure. Pressure within the water supply system (i.e., city or private water source).

                        System Pressure. Pressure within the sprinkler system (i.e., above the check valve or other backflow prevention device).

                        Water flow Alarm Device. An attachment to the sprinkler system that detects a predetermined water flow and is connected to a fire alarm system to initiate an alarm condition or is used to mechanically or electrically initiate a fire pump or local audible or visual alarm.

                        Wet System. A system employing automatic sprinklers attached to a piping system filled with water and connected to a water supply so that water discharges immediately from sprinklers opened by fire.


SECTION 2    INSTALLATION

            2.1       Devices and Materials

                        2.1.1    Only listed and approved materials, fire sprinkler heads, and devices shall be used in sprinkler systems.

                                    Exception: Listing may be waived for tanks, hangers, water flow detection devices and water control valves. All electrical components must be U.L. listed. Pumps must have a general pump listing but do not have to be listed for fire protection.

                        2.1.2    Pre-engineered systems shall be installed within the limitations which have been established by the testing laboratories where they are listed.

            2.2       Acceptance Tests

                        2.2.1    A Responsible Managing Supervisor shall sign and date and return to the Office of State Fire Marshal within 30 days of the job completion a copy of the fire sprinkler permit to verify that the Responsible Managing Supervisor is satisfied that the job has been installed according to the way that it was designed and permitted, (with minor variations), and that the fire sprinkler system is fully installed, has been tested, meets the design criteria of the permit, and is ready to provide the expected fire sprinkler protection.

                        2.2.2    Underground mains and lead-in connections to system risers shall be flushed before connection is made to sprinkler piping, in order to remove foreign materials that may have entered the underground piping during the course of the installation. For all systems, the flushing operation shall be continued until water is clear.

                                    2.2.2.1 Underground mains and lead-in connections shall be flushed at or above the hydraulically calculated water demand rate of the system.

                                    2.2.2.2 To avoid property damage, provision shall be made for the disposal of water issuing from test outlets.

                        2.2.3    All aboveground piping shall be hydrostatically tested in accordance with NFPA 13, which is typically at 200 p.s.i. for two hours. Pex pipe may be hydrostatically tested at 50 p.s.i. in excess of the demand pressure.

                        2.2.4    It is suggested, but not required, that all underground supply piping from the water utility shut-off to the sprinkler system connection be hydrostatically tested at 50 p.s.i. above the expected static pressure for two hours, to ensure the reliability of the materials and installation.

SECTION 3    WATER SUPPLY

            3.1       General Provisions

                        3.1.1    Every automatic sprinkler system shall have at least one automatic water supply.

            3.2       Water Supply Sources

                        3.2.1    The following water supply sources are acceptable:

                                    3.2.1.1 A connection to a reliable water-works system.

                                    3.2.1.2 An elevated tank.

                                    3.2.1.3 A pressure tank installed in accordance with NFPA #13, and NFPA #22.

                                    3.2.1.4 A stored water source with an automatically operated pump on a dedicated circuit of proper size and capacity. Pumps shall not cycle on and off during minimum flow situations such as when one fire sprinkler head is flowing.

                        3.2.2    All stored water sources shall have a low-water alarm set to give a steady signal when the water level falls below 100% of the calculated required volume. Tanks shall be covered and protected against freezing.   Automatic-fills will only be allowed by prior permission of the Office of State Fire Marshal for unusual situations, because basements get flooded when automatic-fills fail. When automatic fills are allowed they shall be set to regulate the available water supply volume from a minimum low water level equal to 100% of the required calculated volume to a minimum high water level of 110% of the required calculated volume.

                                    Exception: Where a performance-based design approach is used as explained in 5.1.2.

            3.3       Combined Piping System

                        3.3.1    A piping system serving both sprinkler and domestic needs shall be acceptable when:

                                    3.3.1.1 A demand flow of 5 gpm is included for domestic use. The domestic use shall be added to the sprinkler system in determining the size of common piping and the size of the total water supply requirement. In multiple occupancies, 2.5 gpm for each living unit up to a maximum of 50 gpm shall be added to the calculated system demand.

                                    3.3.1.2 All piping in the system conforms to the piping specifications of this standard.

....................................3.3.1.3 Permitted by the local plumbing or health authority.     

            3.4       Water Utility

                        3.4.1    Every Life-Safety Sprinkler System supplied by a water utility shall be provided with the following:

                                    3.4.1.1 A State Department of Health & Human Services approved and local utility accepted backflow prevention device arranged to prevent non-potable water from entering the domestic water supply of the distribution system. Connection for fire protection to city mains is often subject to local regulation concerning metering and backflow prevention requirements. The flow characteristics of the meter and/or backflow prevention device must be included in the hydraulic calculation of the system.

                                    3.4.1.2 An approved pressure reducing valve in those locations where water utility pressure exceeds 120 p.s.i.

                                    3.4.1.3 A service line to support a Life-Safety Sprinkler System installed to the utilities specifications.

                                    3.4.1.4 The local water utility compliance with the local fire department requirements concerning notification of the disruption of water service to properties protected by the Maine Life Safety Standard.

 

SECTION 4    SYSTEM COMPONENTS

            4.1       Valves and Drains

                        4.1.1    Each system shall have a control valve. Control valve shall be an indicating type, and shall be locked, electrically monitored or sealed in the open position.

                        4.1.2    Each sprinkler system shall have a 1/2" or larger drain and test connection with valve on the system side of the control valve and flow alarm device. The test orifice size shall be equal to the sprinklers installed. Drain shall discharge to the atmosphere or to a suitable interior sanitary drain with air gap, as required by local/state plumbing codes.

                        4.1.3    A pressure gage shall be installed on both the system side and the supply side of each system check valve and backflow prevention device, in an accessible and visible-location.

            4.2       Pipe and fittings

                        4.2.1    Pipe or tube used in sprinkler systems shall be as permitted by NFPA #13 including specified steel, copper and plastic.

                        4.2.2    The use of Chlorinated Poly Vinyl Chloride and Polybutylene and Cross-linked Polyethylene (Pex) tube when each is listed for use in fire sprinkler systems shall be permitted when installed according to the manufacturer’s specifications but pex pipe shall be limited to light hazard occupancies as defined by NFPA 13, and CPVC pipe (exposed or concealed) shall not be used in kitchens. [Pipe/joint failures have been known to occur after exposure to cooking oil fumes over extended periods of time]. Pex pipe may be used in stand-alone systems. Pex pipe may be exposed in basements when the entire basement has fire sprinkler coverage and when the pex is not exposed to direct sunlight.

                        4.2.3    Whenever the word pipe is used in this standard, it shall be understood to also mean tube.

                        4.2.4    Fittings used in sprinkler system shall be as permitted by NFPA #13 except as noted in 5.2.2.

                        4.2.5    Joints for the connection of copper tube may be soldered when used for wet pipe systems. Solder used shall conform to local plumbing codes.

            4.3       Piping Support

                        4.3.1    Piping shall be supported from structural members. This standard contemplates hanging methods comparable to those used in local plumbing codes.

                        4.3.2    Piping that is laid on open joists or rafters shall be secured to prevent lateral movement.

            4.4       Sprinklers

                        4.4.1    Only fire sprinkler heads tested and listed by a nationally-recognized independent testing agency shall be used.  All fire sprinkler heads shall be installed according to their listing.

                        4.4.2    The sprinklers shall have fusing temperatures not less than 35 degrees F above maximum expected ambient temperature.

                        4.4.3    Fused, damaged or painted sprinklers shall be replaced with sprinklers having the same performance characteristics as original equipment.           

            4.5       Alarms

                        4.5.1    Local water-flow alarms shall be provided on all sprinkler systems. (See section 1.4 for definition of water flow alarm device.)

            4.6       Spare Sprinklers

                        4.6.1    At least 3 spare sprinklers of each type, temperature rating and orifice size used in the system should be kept on the premises. When fused sprinklers are replaced by the owner, Fire Department, or others, care should be taken to assure that the replacement sprinkler has the same operating characteristics.

                                    Exception: If fewer than 3 sprinklers of a particular type, temperature rating and orifice size are used in the system, then the number of spare heads required only needs to be the number of that type, temperature rating and orifice size in use.

            4.7       Fire Department Connection

                        4.7.1    The size, type, and location of the Fire Department Connection shall be according to the local fire department.

            4.8       Electrical Wiring

                        4.8.1    All electrical wiring for pump motors, magnetic contactors, switches, circuit breakers, alarms, etc. shall be in accordance with all applicable Local, State and National codes and the Small Pump Policy. Pump motor bases shall be at least 6" above the floor.  Starting loads and operating loads of pump motors must be considered in determining sizing of electrical feeds, breakers and starting devices.

            4.9       Electrical Supervision/Pump Motor

                        4.9.1    The pump power circuit shall be monitored.

                        4.9.2    Methods of monitoring the pump power circuit condition include, but are not limited to, the following:

                                    4.9.2.1 Installation of a power alarm relay connected to the pump power circuit and to a separately controlled power circuit, in such a manner as to activate an audio/visual alarm in the event of interruption of the pump power circuit, which will be promptly noticed.

                                    4.9.2.2 Interconnection of a frequently used light or appliance with the pump power circuit, so that interruption of the pump power circuit will be promptly noticed.

                        4.9.3    NOTE: In all cases the pump power failure alarm should be wired so that an alarm indicator must remain "ON" until the pump power is restored. A silencing switch which deactivates an audible alarm, but simultaneously activates a visual indicating light until the pump power is restored is one means of accomplishing this objective.

SECTION 5    SYSTEM DESIGN

            5.1       Design Criteria

                        5.1.1    Design Discharge. The system shall provide a discharge of not less than the design density listing of the fire sprinkler heads for the hazard and the head spacing.

                        5.1.2    Number of Design Sprinklers. The number of design sprinklers shall be 3 for wet systems and 4 for dry systems. If for a wet system a compartment contains more than 3 sprinklers, only 3 must be calculated and those sprinklers must be adjacent to one another.

                                    Exception: The required number of fire sprinklers calculated to flow may be increased and/or the minimum time duration increased according to a performance-based need, considering evacuation time, emergency response time, hazards, nature of occupancy, construction type, the presence of other fire protection features, and whether or not the system is wet or dry, and any other related factors. This increase in design criteria will be with prior approval by a Responsible Managing Supervisor acting as the “authority having jurisdiction” for the Office of State Fire Marshal. [Also see section 5.1.3 for an exception which allows a 1 or 2-head calc.]

                                    5.1.2.1 Any variations are to be noted on the hydraulic summary plate on the system riser.

                                    5.1.2.2 The design area shall be that compartment or section of the building which is most hydraulically remote from the water supply.

                        5.1.3    Water Demand. The water demand for the system shall be determined through hydraulic calculation of a minimum of the 3 most hydraulically demanding adjacent sprinklers for a wet system, in accordance with section 5.1.2 for a duration of 10 minutes, but if the largest room has only 2 fire sprinkler heads, then 2 sprinklers may be calculated instead of 3. If the largest room has only 1 fire sprinkler head, then 1 sprinkler may be calculated instead of 3. There will be no hose stream demand requirement.

                        5.1.4    Sprinkler Coverage. The coverage shall be according to the listing of the fire sprinkler head.

                                    5.l.4.1  Maximum distance between sprinklers and the maximum distance to a wall or partition shall be according to the listing of the fire sprinkler head. The “small room rule” of NFPA 13 may be used for head spacing. The minimum distance between sprinklers within a compartment shall be according to the listing of the fire sprinkler head.

                                    5.1.4.2 The minimum operating pressure of any sprinkler shall be in accordance with the listing information of the sprinkler and provide the minimum flow rates specified in section 5.1.1. Application rates, design areas, areas of coverage, and minimum design pressures other than those specified may be used with special sprinklers which have been listed for such specific installation conditions.

                        5.1.5    Position of Sprinkler. Sprinklers shall be positioned according to their listing.

                                    5.1.5.1 Sprinklers shall be positioned so that the discharge is not obstructed by beams, light fixtures or other obstructions. When tests are performed which show that sprinklers are positioned so that the discharge is not obstructed, sprinklers may be installed in accordance with the test results.

            5.2       System Types Allowed

                        5.2.1    Wet-Pipe System. A wet pipe sprinkler system is one that is filled with water at all times and is protected against freezing.

                        5.2.2    Dry Pipe System. A dry pipe sprinkler system is one that is filled with air or nitrogen under pressure.  When the dry pipe is filled with air, the pipe must be schedule 40 or greater, and the joints must be threaded or cut-grooved.  When the dry pipe is filled with nitrogen, then the pipe may be schedule 10 and the joints may be roll-grooved. In either case the pipe is to be black steel or to be prefabricated before galvanization. Galvanized pipe may only be used otherwise when filled with nitrogen or with special prior permission from the Office of State Fire Marshal. Pitching of pipe is to be a minimum of ½” within 10’ for all pipe including mains where feasible. When a dry system is installed there must be a desiccant dryer on the air maintenance line or a better method for keeping moisture reduced inside the pipe such as the use of nitrogen. [Desiccant dryers must be checked frequently for replacement or restoration after each introduction of water into the pipe and then quarterly as a minimum until history proves otherwise.  They are typically blue when dry and turn pink when moist. Keeping the inside of the pipe free from moisture will greatly reduce expensive maintenance and will greatly increase the life-span of the pipe. Note also that testing shows that black steel will last longer than galvanized pipe unless the pipe is prefabricated before galvanization or unless the pipe is filled with nitrogen.]

                        5.2.3    Multipurpose System.  A multipurpose (also called "network") wet sprinkler systemis a fire sprinkler system that is interconnected with the domestic plumbing.

            5.3       Pipe Sizing

                        5.3.1    Piping shall be sized hydraulically in accordance with the methods described in NFPA #13.

                        5.3.2    The minimum pipe size shall be 3/4" on all systems using copper, CPVC, pex, and polybutylene. The minimum pipe size shall be 1" for steel.  The minimum pipe size for copper, CPVC, pex, and polybutylene when interconnected with domestic plumbing shall be ½”.

            5.4       Piping Configurations

                        5.4.1    Piping configurations may be looped, gridded, straight run or combinations thereof except dry systems shall not be gridded.

            5.5       Location of Sprinklers

                        5.5.1    Sprinklers shall be installed in all areas except where noted below.

                                    Exception No. 1: Sprinklers may be omitted from all closets and pantries where the least dimension does not exceed 3 ft. and the area does not exceed 24 sq. ft. and the walls and ceilings are surfaced or backed with non-combustible or limited-combustible materials. Sprinklers may also be omitted from closets of any size on exterior balconies as long as they have no openings directly into the building.

                                    Exception No. 2: Sprinklers may be omitted from porches, balconies, corridors & stairs when any of these are open and attached.

                                    Exception No. 3: Sprinklers may be omitted from carports, garages and similar structures.

                                    Exception No. 4: Sprinklers may be omitted from attics, crawl spaces, floor-ceiling spaces, and other concealed spaces all of which are not used or intended for living purposes and do not have fuel-fired equipment. When they meet this exception except for having fuel-fired equipment, then only the area of the fuel-fired equipment needs to have fire sprinkler coverage.

                                    Exception No. 5: Sprinklers may be omitted from unheated entrance foyers including unheated mudrooms which are not the only means of egress. 

                                    Exception No. 6: Sprinklers may be omitted from walk-in refrigerators, freezers, coolers and similar unheated areas.

                                    Exception No. 7: Sprinklers may be omitted from bathrooms that are less than 55 square feet.

                                    Exception No. 8: Sprinklers may be omitted from penthouse equipment rooms.

                                    Exception No. 9: Sprinklers may be omitted from elevators & elevator machine rooms.

                                    Exception No. 10: Sprinklers may be omitted from ceiling pockets that have a total volume that does not exceed 100 cubic feet, and that have limited-combustible or noncombustible interior finish, and that are separated from adjacent unprotected ceiling pockets by at least 10 feet of horizontal distance, and that have the entire floor beneath them protected by the sprinklers at the lower ceiling level. Skylights that do not exceed 32 square feet shall be permitted to have a plastic cover and still meet this exception.

                                    Exception No. 11: Sprinklers may be omitted from storage areas that are accessed through trap-doors, ceiling pull-down ladders, cabinet-sized doors and access panels, and other areas that are clearly not used or intended for living purposes and do not have fuel-fired equipment. Some indicators of areas clearly not used or intended for living purposes are dirt floors, low ceiling height, inadequate lighting, wet or excessively damp, unfinished, unheated, unheated and/or areas that are not accessible from the interior of the building. When they meet this exception except for having fuel-fired equipment, then only the area of the fuel-fired equipment needs to have fire sprinkler coverage.

            5.6       Drawings and Calculations

                        5.6.1    Scaled and dimensioned drawings showing building and system layout, pipe sizing, ceiling heights and similar construction features shall be submitted along with hydraulic calculations to the Office of State Fire Marshal for review and approval prior to installation. Pump performance data and pump manufacturer's data shall be included in submittal.

                        5.6.2    There shall be a Responsible Managing Supervisor specified who is responsible for the fire sprinkler design.

SECTION 6    MAINTENANCE

            6.1       The responsibility for properly maintaining a sprinkler system is the obligation of the owner, or the owner’s representative who should understand the sprinkler system operation.

                        6.1.1    The fire sprinkler system shall be inspected, tested, and maintained according to NFPA 25.

                        6.1.2    The licensed contractor that is responsible for the installation shall provide the owner or owner’s representative with instructions regarding the operation and maintenance of the fire sprinkler system and its components.

                        6.1.3    The licensed contractor that is responsible for the installation shall make available to the owner or owner’s representative a copy of NFPA 25 for their purchase when the owner or owner’s representative elects to do their own inspection, testing and maintenance of their fire sprinkler system.

                         6.1.4 Facilities that are licensed by the Department of Health and Human Services shall have quarterly inspections done according to NFPA 25.

                         6.1.5    The property owner shall notify the local fire department anytime that the sprinkler system as been temporarily or permanently turned off.

 

[Last updated 9-17-12 by changing section 5.2.2. to include cost-savings options when using nitrogen, and some editing of section 5.1.3 for simplification plus several clarifications and grammatical corrections. Previously updated 9-10-12 to clarify exception #11 under section 5.5.1. Previously updated 2-27-12 by rearranging the explanatory text in 5.2.2. so that it's closest to the text that it explains, and then highlighting in bold text the 5.2.3 heading. Previously updated 2-24-12 by adding a reference note to the end of the exception in section 5.1.2, and then improving the grammar of section 5.1.3 to give context with the requirement in section 5.1.2 for added clarity and then section 3.2.2 was reworded for simplicity & clarity. Previously updated 2-16-12, to add some text to 3.2.2 and to 4.2.2 to add clarity & to add a sentence right after the Preface regarding insurance. Previously updated 2-15-12 which was the replacement of the 1988 standard with a 2012 revision of the standard. Questions about this standard may be addressed to 207-626-3889, or fax 207-287-6251, or e-mail "eric.j.ellis@maine.gov".]