atwoodnarritive
Fire Sprinkler portion of
Narrative Report For
New three story Office Building
8 Atwood Drive
Northampton, Ma
BY
Warehouse Mechanical Contractors, Inc.
Ma Sprinkler Contractor License SC 2254 Expires 11/23/2013
413-536-9222
January 3, 2012
FIRE PROTECTION SYSTEMS NARRATIVE REPORTS
BASIS (METHODOLOGY) OF DESIGN
Section 1-Building Description
a. Building "USE" Group: B-business offices.
b. Type (s) of occupancies (hazards within building): Office.
d. Three stories above grade high point of building roof is 42’-11”.
e. Zero stories below grade.
f. First floor = 12,900 square feet, second and third floors = 13,200 square feet each, total 39,300.
g. Storage is limited to designated closets or rooms.
Project includes a wet pipe sprinkler system. The building is classified Light Hazard in
accordance with NFPA 13. Sprinklers are provided throughout with one zone for each of the
three floors. All non-leased areas will be provided with upright heads and one inch outlets for
future tenant ceilings under separate contract.
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 13, 2007 NFPA 72, 2007, NFPA 24, 2007…
Section 3 - Design Responsibility for Fire Protection Systems
Warehouse Mechanical Contractors, Inc. (develops a full system layout, design criteria and calculations)
installs 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.
a. Water supply new 6” sprinkler main connected to the 8” main in Atwood Drive
Which is connected to a circulating main in US Route 5.
b. Automatic sprinkler systems and components.
c. Fire alarm systems and components-audio and visual appliances installed
throughout in accordance with NFPA 72.
d. Manual suppression systems-small hose stations and standpipe aren’t required.
e. Seismic provided in accordance with NFPA 13.
f. Storz connection provided on the front of the building.
All of the above items are required by regulations. (780 CMR) all systems are new.
903.1.1(1.B) 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 contacts
on the wet system flow switch will activate alarm, local audible visual panels and
provide alarm contact for the fire control panel.
903.1.1 (1.C) Testing Criteria
Section 1-Testing Criteria in accordance with NFPA 13.
Underground piping::Hydrostatically test at 200 psi for two hours without a loss of pressure. Flush at
880 gpm or highest pressure obtained.
System piping:
1. Hydrostatically test wet sprinkler system at a pressure of 200 psi. for two hours without a loss of
pressure.
2. In accordance with NFPA 13 conduct forward flow test of backflow preventer at a
rate of 151 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 wet and dry systems 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 flushing.
d. Gauges-main riser for 2" drain and hydrostatic testing.
e. Fire hose is required to direct backflow preventer flushing discharge.
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 shop drawings for conformance to 780 CMR 903.3 and has identified
deviations if any, from the approved fire protection construction
documents.
b. Confirmation by the building owner/developer or authorized representative that
They-have received the as-built sprinkler system shop drawings from the
installing contractor.
c. 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.