GAS SUPPRESSION SYSTEM CALCULATIONSThe Novec 1230 system is installed in Library and Store & Pharmacy of a hospital. It provides continued fire protection of the costly medicines and irreplaceable photographs, books, documents. The contents of the library are protected by this fire suppression system that does not cause damage while still being environment friendly. Design calculations for Library area Step 01: Determine hazard volume Library volume = 46’ (l) x 32’5” (b) x 10’ (h) = 14950 ft 3 Step 02: Determine Volume of solid, permanent structures, or equipment. 2 Area of each column = 2.42ft Volume = 2.42 x 10 3 = 24.2ft No. of pillars occupying room area = 7 Total Volume = 24.2 x 7 = 169.4 say 170 ft 3 Step 03: Calculate reduced volume Reduced volume = Step 1 ans. – step 2 ans. 3 3 = 14950 - 170 = 14780 ft ~ 418.52m Step 04: Determination of NOVEC 1230 Quantity Q = V x CF x C Alt Where Q = Agent quantity required [kg] V = Hazard volume [m³] CF = Flooding factor [kg/m³] C Alt = Altitude correction factor Therefore, Q = 418.52x 0.5875x 0.90 = 221.29 6 346.0664 + 0.Hence required agent quantity = say 225Kg To check the concentration C reached in the hazard the following formula can be used: = +( 100 ) Where.0773 100 = 4.5 .52 + ( 250 0.2 412. At sea level this would result in 225 kg / 0.41% 418.943 = 250 kg Novec Specific vapour volume(s) for Novec 1230: Formula: = 0.4 910 561 254. filling Tank fill level = actual filling (kg)/max. Hazard temperature [°C] Altitude = 542m A quantity of 225 kg Novec 1230 has been calculated at an altitude of 542 m. filling (kg) 1 x 412.filled with 250kg Novec 1230 lb 346 471 766 Kg 157.077 250 0.0664 + 0.6 * 75% of max.7 kg tanks required .000274 x T (at sea level) T = max. Q = agent quantity supplied from the system [kg] (at sea level) V = hazard volume [m³] s = specific vapor volume [m³/kg] = 0.000274 = 40 = 0.0 213.9 609 455 206.0773 ) (Concentration is less than NOAEL* (10%) – okay for occupied space) *No Observed Adverse Effect Level Step 06: Determination of number and size of tanks required Nominal Cylinder Size 600 lb 900 lb 1000 lb P/N 20508 20509 20510 Fill Capacity Minimum Maximum lb Kg lb 304 137.5 1000 Empty Weight Kg 276.7 453. 05 2.61 40T 65mm 62.72 40T 150mm 154.52/ 292 = 1.Step 07: Determination of number Number of nozzles: Total Volume of hazard area / coverage area of each nozzle 360° Pattern: 418.08 9.72 5.1 .52/ 146 = 2.072 40T 50mm 52.89 4.43 136.25 24.86 say 3 Step 08: Pipe Size Estimation Pipe Type Pipe Diameter Internal Diameter Min Flow (kg/sec) Max Flow (kg/sec) 40T 1 mm 15.855 40T 32mm 35.93 13.05 54.93 0.454 1.7 40T 125mm 128.35 13.95 56.907 2.61 40.82 40T 100mm 102.495 40T 25mm 26.361 40T 20mm 20.8 0.82 90.2 40.5 6.67 40T 40mm 40.71 9.072 24.64 1.59 3.95 40T 80mm 77.43 say 2 o 180 Pattern: 418. 072 √300 4.05 Therefore.072 m³/kg for Novec 1230. **** 0.5<c2<1.05 m² free venting area is required.5 kg/s Find the next higher value in "Max.Total quantity = 250 kg Novec 1230 (in 10 s) from 2 nozzles 12. . use c2=1 250 kg Novec 1230 to be discharged (within 10 seconds). = 25 0. ** A value between 100 and 300 Pascal’s should be used if there is no other value offered by the client or clients’ representative. 0. A = required free venting area (m²) Q = Novec 1230 flow (kg/s) V = specific volume of agent (m³/kg)* Δp = max. Maximum overpressure allowed = 300 Pa.2 1 = 0. Flow" column Estimated Pipe size = 50 mm (2”) Step 09: Pressure Venting = 2 ∆ Where.2% Novec 1230 concentration. Allowable pressure increase (Pa) ** VHOM = specific volume of the homogeneous air / Novec 1230 mixture*** c2 = resistance coefficient for the opening**** * Use 0. to simplify the formula. *** 0.42 is a good average value for 4.