103017-CFP638-Narrative-River Rock TownhouseNARRATIVE
For Fire Sprinkler Systems
Per Massachusetts 780 CMR Eighth Edition 901.2.1 (1. a.)
Date: October 5th, 2017
Project:
River Rock Residences
Townhouses
72-82 Boston Street
Salem, MA
Contractor:
Difava Fire Protection of MA, Inc.
4 Sheridan Road
Wilmington, MA 01887
1 - Building Description:
Project Narrative
1 - Building Description:
* Wood Frame Construction.
* Building Footprint = 4,200 sqft approximately
* Floors above grade = 3
* Floors below grade = 1
* Occupancies = Residential
* Hazardous materials = None known
* High storage = None known
2 - Applicable Laws, Regulations, Standards:
* NFPA 13 (2013) Installation of Sprinkler Systems
* Underwriters Laboratories Inc. Publications
* Manufacturer's Listed and Approved Design/Installation/Maintenance Manuals
3 - Design Responsibility for Fire Protection Systems:
* Shop drawings developed by Comprehensive Fire Protection LLC.
* Fire Alarm by others
* Kitchen/Cooking suppression by others
* Underground fire service by others
* Manual suppression systems by others
* Smoke control systems by others
4 - Fire Protection Systems to be installed:
The fire protection project consists of installing new sprinklers and pipe in a new building. The system
riser consists of a 4" Storz FDC, 4" wet riser, 3" dry riser, 4" water supply, and all other required valves
and fittings.
5 — Design Methodology:
Fire Sprinkler System Design Parameters:
* System(s) design to be per NFPA 13 (2013), local and State code.
* Sprinklers on 1st through 3rd floors to be residential type, white coated, recessed pendents or
sidewalls.
* Sprinklers on garage level to be commercial type.
* Install sidewall sprinklers to protect under garage doors.
* Calculation area within dwelling units to be the most hydraulically demanding 4 sprinklers calculated
to .10 density over the actual area protected.
* Calculation of sprinklers in the storage area to be at a density of .20 over 900 sqft using the quick
response area reduction allowance.
* Calculation of sprinklers in the garage to be at a density of .15 over 1950 sqft after increasing the
area by 30% for being a dry system.
* The garage and sprinkler room is protected by the dry system. All other areas are protected by the
wet system.
* Install a zone control assembly for each townhouse unit as shown.
* Install steel schedule 10 with grooved fittings or steel schedule 40 with threaded fittings on the
garage level.
* Install cpvc sprinkler pipe on levels 1-3.
CODE REFERENCES:
* Design and installation to conform to NFPA 13, 2013 editions.
* Design and installation to conform to State Code, Local Fire and Building Departments.
6 - Special considerations and descriptions:
* No official code interpretations.
* No official waivers or variances.
7 - Sequence of operation:
* Fire sprinkler activates.
* Water starts flowing and activates the water flow switch.
* Water flow switch sends alarm signal to alarm panel and Fire Department.
* Building alarm is activated.
8 - Testing criteria:
* Tests will be conducted to the satisfaction of local authorities.
* Tests to be set up and scheduled by the contractor.
* Water will be flowed from the inspector's test valve.
* Pipes to be pressure tested to 200 psi for two hours.
* All alarm and tamper switches to be tested for proper activation.
* Written approval of final tests to be obtained from the code official.
* Required fire sprinkler and aboveground piping reports to be submitted to the code officials.