32C-107 32 Smith Fire Narrative-2
FIRE PROTECTION SYSTEMS NARATIVE REPORT
BASIS (METHODOLOGY) OF DESIGN
Section 1 – Building Description
a. Building "Use Group: Mixed (F-2) Low Hazard Factory
(B) Business, Offices.
b. Type(s) of occupancies (hazards within the building): Metal
Worker.
c. Two stories above grade high point of building roof is 23'-0".
d. Zero stories below grade.
e. First floor existing 17,388 S.F., Second floor existing 3,654 SF, new
addition 5,600 S.F. Total = 26,642 Square feet.
f. Storage: In accordance with NFPA-13 ordinary hazard occupancy. Storage
of Flammable/Combustible liquids shall be in accordance with the exempt
quantity limitations of 780 CMR Table 307.7 (1) & (2) and 527 CMR 14
and its referenced sections of NFPA 30.
The building is protected by a wet pipe system and the two exterior canopies
are protected by a dry pipe system.
Factory wet sprinkler flow requirement is .20 GPM over the most remote 1500
square feet which requires 431.1 GPM@ 47.0 PSI at the base of the riser and
681.1 GPM @ 54.5 PSI at the connection to the city main. These are preliminary
Design pressures and flow.
Water flow test is 145 PSI Static, 120 PSI Residual with 1,503 GPM flowing.
Section 2 – Applicable Laws, Regulations and Standards
780 CMR code sections "Fire Protection System Requirements"
Fire Suppression Systems
Requires audio visual alarm devices
Monitoring
NFPA Standards and Editions used for the design of each specific fire protection system, NFPA 13, 2013; NFPA 72, 2010; NFPA 24, 2007
Section 3 –Design Responsibility for the Fire Protection Systems Warehouse Mechanical the installing contractor completely designs and specifies (develops a full system layout, design
criteria and calculations) installs the system and certifies system installation for code compliance at completion. Exempt from Requirement for seal of Massachusetts Registered Professional
engineer in accordance
With MGLC 112 section 81R.
Section 4 –Fire Protection Systems to be installed
The new six inch sprinkler main will tie into the existing eight main in Smith street.
Sprinkler systems and components.
Fire alarm systems and components- audio and visual appliances installed throughout in accordance with NFPA 72.
Manual suppression systems are not required.
Seismic isn’t required in accordance with NFPA 13.
Storz fire department connection provided on the front of
the building.
All of the above items are required by regulations (780 CMR) all systems are new
901.2.1(1.a.ii) Sequence of Operation
Section 1
Wet sprinkler system:
System operates automatically upon the fusing of a single fire sprinkler. Operational Sequence:
Wet system operates automatically on water flow from a single sprinkler.
Closed contacts on the flow switch will provide alarm contact for the fire
control panel and activate the local audible visual panels.
Dry system operates automatically. Air exhausted through a single
sprinkler head allows water to flow operating the closed contact on the
pressure switch.
901.2.1(1.a.iii) Testing Criteria
Section 1- Testing Criteria in accordance with NFPA 13
System piping:
Hydrostatically test wet and dry system piping at a pressure of 200 psi for
two hours without a loss of pressure.
2. Conduct a full forward flow test of the backflow preventer at a rate of
431.1 GPM through both the wet and dry main drain.
3. A 2" main drain test shall be conducted. Record static and residual
pressures on the test certificates.
Conduct system operational and alarm test on the system from the
inspector's test connection in accordance with NFPA 13.
Central station must receive the alarm and trouble signals.
Warehouse Mechanical is in charge of setting up and conducting the testing. Warehouse Mechanical will provide test certificates
Section 2- Equipment and Tools
Manufacturer's instructions
Approved narrative report, sequence of operations section
Flow measuring devices- pitot tube for backflow preventer full forward flow test
Gauges- main riser for 2" drain and hydrostatic testing
Fire hose is required to direct backflow flushing
Section 3- Approval Requirements
Certification from Warehouse Mechanical Contractors stating that the fire
protection sprinkler system has been installed in accordance with the
approved fire protection construction documents and that he has reviewed
the as-built drawings for conformance to 780 CMR 901.7.4 and has
identified deviations if any, from the approved fire protection construction
documents.
Confirmation by the building owner/developer or authorized
representative that they have received the as-built sprinkler system shop
drawings from the installing contractor
Material Test, Performance and Completion Certificates, properly
executed by the installing contractor in accordance with the applicable
NFPA Standards.
Satisfactory functional test of all fire protection systems witnessed by the
Building official and the head of the fire department or their designees.