Method of Statement for Fire Fighting Works (Part-1)


Purpose:

This method describes the detailed procedure for installation and Testing of Wet Raiser Fire Protection System, Pipes, Sprinkler, Fire Pumps, Valves and Fire Fighting Accessories as per the standard Practice and Codes.

General Equipment & Tools:

The equipment that will be engaged for Installation of Fire Fighting works will be

  • Tool Box
  • Welding Machine
  • Drilling Machine with various Bits
  • Grinding Machine
  • Cutting Machine
  • Threading Machine
  • Chain Block
  • Pipe Wrench
  • Hand Tools-gloves.
  • Hammer
  • Portable Lights
  • Manual Excavation Tools
  • Removable Barricades
  • Scaffolding / Mobile scaffold
  • Ladder
  • Spirit Level
  • Screwdriver, Pliers, Spanner.
  • Marker
  • Pressure gauge
  • Level gauge / Spirit level.
  • Measuring tape
  • Pressure test pump.

Storage & Material Handling:

  • The storage area must be free from dust and the materials should be stacked in proper manner to avoid any damages.
  • The Material shall be stored in designated area of the Store to protect the M.S Pipe and Other Fire Fighting Accessories against effects of weather and environment.
  • The material shall be transported in their original packing to Site location.
  • The pipes will be stacked in the site store on a proper stand on wooden loft on a flat surface at a height not exceeding 1.7m. From the bottom layer.
  • All open ends of pipes will be covered to protect from foreign matter, dirt/debris
  • Fittings will be separately packed and stored as per the sizes required for the project.
  • Chemicals must be stored in well ventilated location and away from direct sunlight.

Inspection of Materials: 

  • Inspection of Pipe / Valve / Flanges:
  • Check Type of Material ,Size of Material , Make of Material.
  • Chemicals such as paints, primer and thinner, check their expiration date before receiving.
  • Physical Damages Inspection:
  • In case of any damages observed during inspection, the concern report will be issued and Material shall be returned to the supplier for replacement.

Installation Procedure:

(1) Pipe Hanger / Support Installations

  • Piping Route will be the as per most advantageous manner possible with respect to headroom, valve access, opening and equipment clearance, and clearance for other work.
  • The Line layout should be verified from Site in charge.
  • After marking the pipe routes, the anchoring points will be drilled according to the required support spacing as shown on the approved shop drawings.
Pipe Diameter (mm) Maximum Hanger Spacing (mm) Rod Size (mm)
25 2000 8
32 2500 8
40 2500 8
50 2500 8
65 2500 10
80 2500 10
100 * 2500 * 12 *
150 * 3000 * 16 *
200 * 3000 * 16 *
 * As per Site Requirement Fabrication Support may be used.
  • Mark out the location of hanger thread rods for pipe installation as per the approved construction drawing.
  • Fasteners and fully threaded rods shall be used for installing the pipe supports. The sizes of pipe supports and installation shall be in accordance with manufacturer’s recommendations.
  • For Single pipes of size 100 mm and above, with the prior approval 50xx50xx6 mm MS Angle iron and for Double Pipe 75x75x6mm with U Clamp with Fastener may be used for Supporting horizontal Pipe from ceiling.
  • Drill the marked position for hangers and supports by using the drill bit of appropriate size.
  • Fix the unfix anchor at drilled position by gentle and uniformly hammering.
  • Fix the threaded rod of appropriate diameter and size & length in the anchor by twisting by turning.
  • After fixing the threaded rod, insert a washer of appropriate size in to the rod.
  • Finally fix the washer near to the slab by tightening a nut over it, this will improve the strength and load bearing capacity of threaded rod.
  • For installing pipes vertically or horizontally inside the building standard pipe supports of reputed make shall be used. Following supports shall be used.
  • Clevis Hangers or MS Chanel for horizontal supports to adjust varying heights.
  • The Pipe route should be min 500mm away from wall.
  • Supports will be arranged as near as possible to pipe joints and any change in direction.
  • Vertical Riser Support:
  • Risers shall be supported by pipe clamps or by hangers located on the horizontal connections within 24 inches (0.6 Meter) of the centerline of the riser.

(2) Pipe Welding / Fabrication:

  • Welding Machine:
  • Welding machines shall be in good working condition and shall have proper control for regulating current.
  • Location of welding machines and the distribution boards to be connected with them shall be verified by site electrical Team to avoid overloading of the distribution boards, cables and electrical power sources.
  • All welding Machine ,other Electrical Tools, the electric cables, distribution boards and connections for machines shall be carefully checked once a Month to maintained it in a good working condition.
  • Welding cables used shall have proper insulation throughout the length. The cables sh
  • all be carefully examined and repaired as necessary every day.
  • Welding Electrodes:
  • Electrodes used for welding should comply with IS:814, 1991.
  • Generally all welding shall be performed using Shielded metal arc welding (SMAW) process using cellulosed-coated electrode (E6013 type) for root run and subsequent passes
  • Storing of Welding Electrodes:
  • Welding electrodes shall be stored in indoors free from moisture.
  • Qualified and certified welders only shall do welding.
  • No welding shall be done if there is impingement of any rain, or high winds
  • Fabrication of Pipe (But Welding):
  • The welding of pipes in the field should comply with IS:816, 1969.
  • All pipes and fittings shall be cleaned of Dust, Mud from inside and outside before Welding.
  • All pipe, fittings shall be smooth, clean and free from blisters, loose mill scale, sand and dirt prior to the installation.
  1. Edge Preparation: Before welding, the ends shall be cleaned by wire brush, filing or grinding and making “V” on edge of both pipe.
  2. Welding of Root Run: Primary Welding shall be done by E6013, 2.5mm Welding Rod (90 to 90A, 18 to 25V) of approved make.
  3. Chipping and Cleaning of Root Run: Each weld- Root run shall be thoroughly cleaned to remove the slag, irregularities and any defects, before the next run is deposited.
  4. Final Welding Run: Final Welding shall be done by E6013, 3.5mm Welding Rod (80 to 140A, 20 to 25V) of approved make.
  5. Chipping and Cleaning of Final Run: Each Final weld shall be thoroughly cleaned to remove the slag, irregularities and any defect

(3) Pipe Installation:

  • Installation of pipe shall be co-ordinate with architectural, structural and MEP work for a fit for purpose installation. Any deviation shall be intimated to the engineer for approval.
  • Cut all pipes accurately to measurement determined at the site. After cutting the pipe, ream it and remove all burrs.
  • Run all piping as direct as possible, avoiding unnecessary offsets and conceal piping in finished rooms.
  • Install all piping close to walls, ceilings and columns so piping will occupy the minimum space but Proper space will be provided for covering and removal of pipe, special clearance, and for offsets and fittings.
  • Pipe work will be installed not closer than 200 mm to electrical conduits, lighting, and power cables.
  • Pipes will be spaced in ducts, ceilings, voids and plant areas, such as adequate access is permitted to any pipe for maintenance or removal without disturbance to the remaining pipe work and other services.
  • Pipes will not be solidly built into walls or plaster. Pipe joints will not be positioned within the thickness of walls, floors or in any other inaccessible position. Pipes passing through walls and floors will be sleeved.
  • Couplers, unions and fittings will be screwed up to the reduced depth of the thread, such that no more three-turns are showing when pulled up tight.
  • All pipes, valves and fittings and connected equipment will be thoroughly cleaned of rust, sand and dust, scale and other foreign matter before erection and before any initial fill water for hydraulic testing.
  • After completion of pipe end connection, fix / tight the support clamps properly to make the pipe straight and level as per the layout.
  • Check the levels of pipe work with spirit levels and measuring tape.
  • The Spacing of fire pipe supports for sprinkler / clevis hanger shall not be more than that specified below
Pipe Support Details
Nominal Pipes Diameter Spacing between supports Hanger rod diameter Hanging Strip Size(thickxwidh)
Up to 25 mm 2.00 meter 8 mm 1.5mmx25mm
32 to 50 mm 2.50 meter 8 mm 1.5mmx25mm
65 to 80 mm 2.50 meter 10 mm 2mmx30mm
100 mm * 2.50 meter * 12 mm * 2mmx30mm *
150 mm * 3.00 meter * 16 mm * 3mmx30mm *
200 mm & above * 3.00 meter * 16 mm * 3mmx30mm *
* As per Site Requirement Fabrication Support may be used.
  • All lines shall be suitably supported so as to provide rigidity and avoid vibrations.
  • Proper lines and levels shall be maintained while installing exposed pipes.
  • All lines less than 50 mm NB size can be socket welded to matching rating fittings.
  • All lines above 50mm NB size shall be butts welded with full penetration welds.
  • All bolts, nuts and washers used shall be of GI.
  • Extra supports shall be provided at the bends and at heavy fittings like valves to avoid undue stress on the pipes.
  • Open ends of piping shall be blocked as soon as the pipe is installed to avoid entrance of foreign matter.
  • Pipes must be of Heavy grade M.S. pipe conforming to IS 1239. The pipes, fittings and installation shall be hydraulically tested to a pressure of 15 Kg/Sq.cm. or 1.5 times the working pressure whichever is higher.

(4) Flanges:

  • Mild steel flanges shall be in accordance with Table – 17 of IS : 6392 i.e. “Plate Flanges for Welding” and flange thickness shall be as under. Gasket thickness shall not be less than 3 mm.
  • Check the flange size and specification according to pump size and valve size,
Flange  Details
Pipe Dia Flange Thickness No. of holes
200 mm. 24 mm. 12
150 mm and 125 mm 22 mm. 8
100 mm and 80 mm 20 mm. 8
65 mm. 18mm 4
40 mm and below. 16mm 4
  • All hardware items such as Nuts, Bolts, and Washers shall be of appropriate size.
  • Washers shall be used on both sides of the bolt.

Method for Installation of DB or Panel-(Part-2)


(4) ELECTRICAL CHECKS BEFORE CHARGING THE  PANEL

  • TESTING CONTINUITY BETWEEN ALL METAL PARTS AND GROUND
  • For performing this test, it is generally recommended to use a milliohm meter for continuity measurement.
  • INSULATION RESISTANCE TESTS For SWITCHGEAR
  • It is recommended to perform these tests before connection starting so all isolating devices will be closed.
  • If cables are already connected, open the isolating devices before any test.
  • Disconnect the ground sensing device and the control cables.
  • Using a 1000 V DC megohmmeter, measure the insulation resistance after a one minute Electrification time between :
  • 1) Phase to Phase
  • 2) Phase to Neutral
  • 3) Phase to Ground
  • 4) Ground to Earth
  • Using a 500 V DC megohmmeter, measure the insulation resistance after a one minute electrification time between:
  • 1) Auxiliary circuit and ground.
  • Reconnect the cables after testing.
  • Control Wiring Electrical Tests for Switchgear and Switchboards
  • Perform insulation-resistance tests on control wiring with respect to ground. Apply 500 volts dc for 300-volt rated cable and 1000 volts dc for 600-volt rated cable for one minute each.
  • Important: Units with solid-state components could be damaged if not properly isolated (via removal of plugs and/or fuses) before applying test voltage. Be sure to follow all manufacturers’ recommendations when performing dielectric tests on solid state components
  • Minimum insulation-resistance values of control wiring should be comparable to previously obtained results but not less than two megohms.

Charging & Testing of Panel:

  •  Cable Terminations:
  • Identify cable to be laid and Cut the cable to required length.
  • Put temporary marker onto the cable.
  • Carefully pull (using suitable method) and lay the cable to its route
  • Make appropriate opening (Cut-out) in DB /PANEL for inserting the cable with a rubber gasket so that there will be no sharp edges and secure the wire insulation from damage.
  • Gland the cables using appropriate cable glands size.
  • Terminate cables inside enclosure by securing cables to switchboards with gland bracket; and enclosure with glanding plates or fabricated steel extension boxes.
  • Slice the cable and identify cores to be used. Installed the ferrule number and cable lug
  • Dressing the cable inside the panel and Secure the cables (if necessary) with cable ties or other suitable method
  • Install cable marker / tag as specified
  • Terminate the cable properly & as per termination schedule
  • Earth the glands to the equipment earth grid
  • After complete termination of wire/cable same DB compartment shall be cleaned and fixed door.
  • Earthing Connections:
  • The Panel Main earthing bar is to connected to earth electrode or earthing Grid by Suitable size of 2 No’s of Eathing Strip or Earthing Wire via testing joints.
  • Energize the Panel
  • Switch off All Switchgear of Panel.
  • Connect the incoming cables of Panel to the Power Supply Source.
  • Check healthy ness of Power Supply at incoming of Panel.
  • NO LOAD:
  • Measure input Voltage of Power Supply between Phase to Phase, between Phase and Neutral and between Neutral and Ground.
  • If measured incoming Voltage is within limit than Switch ON the Main Breaker of Panel.
  • Measure Voltage on Bus bar between Phase to Phase, between Phase and Neutral and between Neutral and Ground.
  • If measured Bus bar Voltage is within limit than Panel should operate on NO LOAD Condition for 5 minutes to observe any heating, sparking and performance of accessories of Panel.
  • After 5 minute, one by one Switch ON the all Circuit Breaker of Panel.
  • ON LOAD:
  • Measure Voltage on each outgoing feeder of panel between Phase to Phase, between Phase and Neutral and between Neutral and Ground.
  • If measured Voltage of outgoing feeders are in within limit than Panel should Energize for 2 hours and verify complete performance. Check for any unusual temperature rise in cables, terminals and protective devices.
  • Correct Phasing:
  • Check Phase Sequence of Power Supply at Outgoing Circuit of Panel.
  • If there is not correct phase sequence for three phase power supply, reverse one phase at incoming side of Panel.
  • Indicators
  • Check all Power Supply ON /OFF / TRIP indicator works properly.
  • If any associated converters check the indications to the corresponding output terminal block.
  • Under/Overvoltage Protection
  • Check the relay operation and adjust to the desired rating.
  • The protection information reports shall be checked up to the distribution board output terminal block.
  • Automatic Transfer Switches
  • Check mechanical and / or electrical interlocks.
  • With the both available supplies (Main Power & D.G Power) confirm the functional checks by presence of voltage, loss of supply, restoration of supply in manual and in automatic mode.
  • The both incoming supplies are readiness in the distribution board
  • Record The Test Data:

Floor Marking Near Electrical Panels:

  • Keep Space in Front of Electrical Panels Clear
  • The area in front of electrical panels must be kept clear and marking with effective floor marking taps.
  • While specific colors of floor marking tape are not required, it’s often recommended that employers select colors that indicate a hazard is present. Striped black and yellow floor marking tape often serves this purpose, as black and yellow are regularly used for hazard markings.
  • When the nominal voltage to ground for a piece of electrical equipment is 600 volts or less, the minimum depth of clear working space in front of the equipment must be 3 feet (in some circumstances, it must be larger). This distance applies to some situations involving voltages up to 2500 volts as well. 

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Codes and Standards:

  • Panel shall comply with the latest Relevant Indian Standards and Electricity Rule and Regulations and shall be as per IS-13947-1993.
  • The general construction shall confirm to IS-8623-1977 (Part-1) for factory built assembled switchgear & control gear for voltage up to and including 1100 V AC.

FLOW CHART:

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