E.M check list for High Pressure Fire Misting System

E.M Check List for High Pressure Fire Misting System

E.M Check list for High Pressure Fire Misting System ( High Pressure & Booter & Jockey Pumps , Deluge, wet ) 1 Change operation mode of 15 pumps to off mode 2 Turn on manually pump# 1, after pump pressure reach upto 140 bar, check & fill column of P#1 which is the below mentioned  3 Turn off   pump#1, reduce the pressure to 100 bar 4 Turn on manually pump# 2 after pump pressure reach upto 140 bar, check & fill column of P#2 which is the below mentioned  5 Repeat the above mentioned for 13 remaining pumps 6 When pressure reach to 140 bar solenoid valve must be opened 7 To ensure that safety valve open at 160 bar, close manual valve or disconnect power of solenoid valve & pressure valve for increasing of pressure upto 160 bar 8 Take pressure reading from control panel & mech pressure gauge, for flow rate read from control panel 9 Change operation mode of 15 pumps to auto mode 10 Make drain to reduce pressure under 20 bar, ensure that three pumps will start one by one each one second 11 After 15 second if the pressure does not reach 100 bar other three pumps will start     S.N item P#1 P#2 P#3 P#4 P#5 P#6 P#7 P#8 P#9 P#10 P#11 P#12 P#13 P#14 P#15     set #1 set#2 set#3 1 Check E/M consultants inspection requests, there aren’t  comments                               2 Check pump frame                               1 Check for abnormal noise &vibration                               2 Check for any leakage from pump, connection & fittings                                3 Check pump pressure, it must reach upto 140 bar                               4 Check soleniod valve for overflow                               5 Safety valve / open at 160 bar                               6 Are safety valve drain connected to return line to tank                               7 Manual air drain                               8 Non return valve                               9 Strainer                               10 Record running current value                               11 Check overload relay ( by reduce setting value) or remove wire No. (96 or 95)                               12 Check phase failure relay remove wire No. (11 or 14)                               13 Check contactor, termination no loss, no heat                               14 Check indication lamps & selector switches                               15 Pump running signal sent from fogtech to fire control panel                               16 General fault signal sent from fogtech to fire control panel                               17 Pressure valve#1/ open at 140 bar       18 Pressure valve#2/ open at 140 bar       19 Differential pressure switch 0.6 bar   20 Differential pressure switch 0.8 bar   21 Pressure sensor       22 Flow sensor   23 Pressure sensor for manifold #1   24 Pressure sensor for manifold #2   25 Pressure sensor for main pipe   26 Tank level sensor   Deluge system the below are connected to fire control panel 1 Location:                               2 Valve tag                               3 Limit switch for manual valve                               4 Solenoid valve                               5 Limit switch for drain valve                               6 Check pipes are supported properly                               7 Check nozzles location no obstruction for its job                               8 Check manual valves                               9 Limit switch for F.H.C                                                               Wet system the below are connected as per mentioned 1 Location:                               2 Valve tag                               3 Limit switch for manual valve/fire control panel                               4 Flow switch / control panel.                               5 Check pipes are supported properly.                               6 Check nozzles location no obstruction for its job.                               7 Check drain line.                               8 Check manual valves.                               Interface between Fire Control Panel & fogtech panel   Pump starting signal sent from fire control panel to dedicated panel                                 Alarm signal sent from dedicated panel to fire control panel that dedicated has problem                               Jockey pump 1 Check E/M consultants inspection requests, there arent  comments   2 Check pump frame   3 Check for abnormal noise &vibration   4 Check for any leakage from pump, connection & fittings    5 Check manual valves   6 Check nonreturn valve   7 Pressure gauge   8 Record running current value   9 Check overload relay (by reduce setting value) or remove wire No. (96 or 95)   10 Check phase failure relay remove wire No. (11 or 14)   11 Check contactor, termination no loss, no heat   12 Check indication lamps & selector switches   13 Check that pump will automatically start under 33 bar  , turn off at 35 bar   Booster pump     pump#1 pump#2 1 Check E/M consultants inspection requests, there arent  comments     2 Check pump frame     3 Check for abnormal noise &vibration     4 Check for any leakage from pump, connection & fittings      5 Check manual valves     6 Check non return valve     7 Pressure gauge     8 Record running current value     9 Check overload relay (by reduce setting value) or remove wire No. (96 or 95)     10 Check phase failure relay remove wire No. (11 or 14)     11 Check contactor, termination no loss, no heat     12 Check indication lamps & selector switches     13 Check that pump will automatically if hp pumps start, that pressure will be 3 bar

Over the last dacade, studies on water mist technology have significantly increased. A survey carried out by Mawhinney and Richardson in 1996 indicated that nearly 50 agencies around the world are involved in the research and development of water mist fire suppression systems, ranging from theoretical investigations into extinguishing mechanisms and computer modeling to the development, patenting, and manufacturing of mist-generating equipment. These recent studies have shown that water mist technologies have the potential either to replace current fire protection techniques that are no longer environmentally acceptable, or to provide new answers to problems where traditional technologies have not been as effective as desired.

Water mist fights fires using smallest droplets of pure water. By atomising water, the reaction surface area of the water is increased by more than 200-fold compared to the one of a conventional sprinkler. Our high-pressure mist systems use extra-small Class I droplets in accordance with NFPA 750. Using pressures between 50 and 200 bar, the water can be atomised effectively. 

The effectiveness of a water mist system in suppressing a fire is directly related to the spray characteristics produced by the nozzles. Rabash, in his early study, gave a detailed list of the important parameters of water sprays for fire suppression. These are:

• Mean flow rate per unit area in the fire region,
• Distribution of flow rate in and about the fire area,
• Direction of application,
• Droplet size and distribution
• Entrained air velocity, and
• Droplet velocity relative to entrained air, flame velocity and fuel type