Method of statement for installation and testing of fire sprinkler system
Scope
this procedure covers installation and inspection of firefighting -sprinkler system
purpose
purpose of this procedure is to define the method of installation and inspection of sprinkler system
Quality control
Quality of installation and materials at site will be ensured by our project team consisting of project manger,project engineer,QA/QC engineer and the site foreman
Quality of the work will be according to NFPA standards and civil defence authority requirements
Storage and handling
The pipes will be stacked in the site store on a flat surface at a height not exceeding 1.7m from bottom layer
Fittings will be separately packed and stored as per the sizes required for the project
All open ends of pipes will be covered to protect from foreign matter,dirt/debris
Responsibilities/supervision
To ensure that all the preparation and application works are carried out according to the contract and manufacturers data sheet
To ensure that the progressing of works is carried out according to the planned program and as per the approved method statement
To ensure that all the equipments and materials required for executing the work are available according to the planned construction program
To co-ordinate with the main contractor MEP coordinator & safety officer for a safe and proper excusion of the work
To provide all necessary information and to distribute responsibilities to his construction team
The foreman will be responsible for
The foreman will carry out his duties by maintaining continuous coordination with project engineer on daily basis ,to ensure proper distribution of the work force in the required and planed locations
To provide project engineer a daily progress report indicating the works achieved and discuss with him the planned activities for the next day
To ensure that the daily work is progressing as planned and advise the project engineer of any requirement for additional resources
To be aware of test frequencies related to pipe work and hydrostatic
To control disposal of waste materials according to the instruction received for the project engineer
To ensure full coordination with the safety officers to maintain safe working and proper housekeeping of the site,following the approved safety measures and further ensure that all his working team are aware of the same to prevent accident and losses
To inform the project engineer about the readiness of work for inspection and its checking if any
Tools&Equipment
The following tools and equipment will be used for fire fighting system installation
Grooving Machine
Threading Machine
Welding Machine
Hilti drill Machine Model TE-1 AND TE-24
and 12''Grinding Machine
Vice Table
Pipe Wrenches
Fire fighting system description
Sprinkler system : Definition
An integrated system of underground and overhead piping designed in accordance with fire protection engineering standards .The portion of the sprinkler system above ground in a network of specially sized or hydraulically designed piping installed in a building ,structure,or area , generally overhead and to which sprinklers are attached in a systematic pattern.The valve controlling each system riser is located in the system riser or its supply piping .The system is activated by heat from a fire discharges water over the fire area
Wet Pipe System
A sprinkler system employing automatic sprinklers attached to a piping system containing water and connected to a water supply so that water discharges immediately from sprinkler opened by heat from a fire
Minimum one four -way inlet branching connection-to 2 ½ ''fire hose and two-way
inlet breaching connection to 1'' fire hose reel system will be connected to the accessibility to connect with fire department
Work Sequence and methodology
Installation of fire sprinkler system
The installation of fire sprinkler system shall be according to approved detailed shop drawings and also as per the recommendations of NFPA 13
Pipe hangers shall be spaced at intervals as specified in our approved shop drawings
Threaded piping will be made with Teflon tape or with a suitable pipe sealing compound -jute and mastic combination-applied
two inches and below sizes of pipe are made threaded - two and half inches and above sizes are normally grooved type.groove can be made cut groove or roll groove
All underground fittings will be welded type .All piping coming underground will be wrapped with poly vinyl chloride tape
All piping must be rigidly supported by a combination network comprised of pipe hangers and rigid support brackets .The spacing will be as per the scheduled attached
Sprinkler head location shall be installed in accordance with approved system plans and coordinated RCP- Reflected Ceiling Plan- layout
Installation of sprinkler head
All the sprinkler heads must be installed according to current NFPA 13 standard
The system piping must be properly sized according to approved drawings and calculations to insure the maximum required flow rate at the sprinkler head
Install the sprinkler heads after the piping is in place to avoid mechanical damage
In the event of a thread leak,remove the unit ,apply new pipe teflon tape,and reinstall
The face of the sprinkler fitting should be installed a nominal 3/8'' to 1'' behind the finished ceiling line,adjustment may be made via the push-on escutcheon plate to compensate for variation in the fittings
Hand tightens the sprinkler into the fitting using the proper size wrench
To install the escutcheon plate,align it with and press it over the sprinkler body until the outer edge of the escutcheon meets the mounting surface
Installation of butterfly valve
The butterfly valve should be located as per the approved drawings,also to make sure that it is located where it will be readily accessible for operation ,inspection and maintenance
During installation make sure that the valve disc does not interfere with the operation of other systems components immediately adjacent to the butterfly valve
When a valve closes,it may be due to debris lodged in the sealing area .This may be corrected by blacking-off the hand wheel and closing it again,several times if necessary . the valve should never be forced to seat by applying a wrench to the hand wheel as this may distort the valve components or score the sealing surfaces
The inlet and outlet piping adjacent to the valve should be properly supported to prevent excessive stress on the valve body . The valve should not be used to force a pipeline into position as this may result in distortion of the valve body
Installation of the flow switch
The flow switch should be located as per approved drawings ,also to make sure that it is located where it will be readily accessible for operation,inspection and maintenance
The flow switch may be mounted on horizontal or vertical pipe. On horizontal pipe they should be installed on the top side of pipe where they will accessible
Drain the system and drill a hole in pipe using a circular saw in a slow speed drill the hole size shall be 2 inches
Clean the inside pipe of all growth or other material for a distance equal to the pipe diameter on either side of hole
Roll the vane so that it may be inserted in the hole,do not bend or crease it
Insert the vanes so that the arrow on the saddle points in the direction of the water flow
Install the saddle strap and tighten nuts alternately
The vane must not rub inside of the pipe or bind in any way
Method of pressure testing systems piping
Sprinkler &Firefighting systems piping
Installation check
Hydro static Testing of pipe line
Test condition performance requirement
Test pressure :1.5 times of the working pressure
Duration : 2 hrs.pressure
Monitoring: By calibrated pressure gauge installed at the lowest element no visible leakage from external piping
At the end of 2 hours Duration ,there should not be any remarkable change in system pressure
Method of testing
Plug all the openings
Close all the drain valves
Fill complete pipeline with water avoiding any air column . For this purpose keep the drain valve at the highest elevation slightly open , while filing water when line is completely filled with water close the valve
By a pressure pump pressurise the line to an intermediate pressure , say 100 psi .wait for 5 minutes ,check all major joints for any visible leak
If the system is OK again pressurise the system to 150 psi and wait for 10 minutes for any drop in pressure or leakage
If the system is found to be leak proof pressurise the line to the required testing pressure and keep for 2 hours
Functional testing for sprinkler system
Open the test valve on alarm check valve water motor alarm gong should be operate
Fire alarm system bell should ring
Main pump should start
By a heat source operate remote sprinkler water should spray covering the area specified
Main pump should start
Indication on fire alarm panel & repeater panel regarding the zone being operated
Health and safety
Work shall strictly follow as per the manufacturer/client/consultant Health &safety recommendations for handling and use of materials .Ensure all involved personnel shall be aware of the same
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