Narrative 126 King Street
FIRE PROTECTION SYSTEMS NARRATIVE REPORTS BASIS (METHODOLOGY) OF DESIGN
Section 1-Building Description
Building "USE" Group: R-2 Residential.
Type (s) of occupancies (hazards within building) Apartments.
d. Three stories above grade high point of building roof is 33’.
e. One story below grade.
f. Basement1,980 square feet, First floor 1,990 Square feet, second floor 1,990 square feet, third
floor 1,380 square feet.= 7,340 total square feet.
g. Storage is limited to closets, attic storage spaces and NFPA 13-R criteria.
Highest demand is in the Basement which is designed for ordinary hazard group one .15 X 900 with an estimated flow of 165 GPM required at base of riser at 35 psi.
Water flow test 122 Static, Residual 100 Total Flow 1455 GPM.
Section 2- Applicable laws, regulations and standards
a. 780 CMR code sections "Fire Protection System Requirements"
903.2.0 fire suppression systems, 903.4.2 requires audio visual alarm devices.
903.4.1 monitoring.
b. NFPA Standards and Edition used for design of each specific fire protection
system NFPA 13R, 2007, NFPA 13, 2007, NFPA 72.
Section 3 - Design Responsibility for Fire Protection Systems
Warehouse Mechanical Inc. the installing contractor completely designs and specifies (develops a full
system layout, design criteria and calculations) and certifies system installation for code compliance at
completion. Exempt from requirement for seal of Massachusetts Registered Professional Engineer in
accordance with G:C 112 section 81R and 901.2.1.
Section 4-fire Protection systems to be installed.
a.Water supply, new 4” sprinkler main connected to circulating city main in
King Street.
b. Sprinkler systems and components.
c. Fire alarm systems and components-audio and visual appliances installed throughout the in accordance with NFPA 72.
d. Manual suppression systems-small hose stations and standpipe aren’t required.
e. Seismic Isn’t required. .
f. Single 11/2 pumper connection on the street side of the building.
All of the above items are required by regulations. (780 CMR) all systems are new or existing. .
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:
1. System operates automatically on water flow from a single sprinkler. Closed contact on pressure switch will activate
local audible visual panels and provide alarm contact for the fire control panel.
901.2.1 (1.a.iii) Testing Criteria
Section 1-Testing Criteria in accordance with NFPA 13.
Underground piping: Hydrostatically test at a pressure of 200 psi for two hours without
A loss of pressure. Flush at 390 GPM per minute or the highest flow available.
System piping:
1. Hydrostatically test at a pressure of 200 psi. for two hours without a loss of
pressure. In accordance with NFPA 13 conduct forward flow test of backflow preventer at a rate of 165 GPM through main drain.
3. 2" main drain test shall be conducted, Record Static and residual pressures on test
certificate.
4. Conduct system operational and alarm test on system from
inspectors test connection in accordance with NFPA 13.
5. Central station must receive alarm and trouble signals.
Warehouse Mechanical is in charge of setting up and coordinating testing. Warehouse
Mechanical will provide test certificates.
Section 2-Equipment and Tools
a. Manufacturer's instructions
b. Approved Narrative Report, sequence of operation section.
c. Flow measuring devices-pitot tube for backflow preventer.
d. Gauges-main riser for 2" drain and hydrostatic testing.
e. Fire hose is required to direct backflow preventer flushing.
Section 3-Approval Requirements
a. Certification from Warehouse Mechanical Contractors, Inc.
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 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.
d.. Satisfactory functional test of all fire protection systems witnessed by the Building official and the head of the fire department or their designees.