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Lightning Protection Calculation

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Lightning Protection Calculation
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   LIGHTNING CALCULATION FOR TG BUILDINGWidth of BuildingL=36mDepth of buildingW=28mHeight of buildingH=23m         2        3  .        0        0 =(L X W) + 2 x (L x H) + 2 x (W+H) + pH 2 sqm=5613.90sqmProbable Number of strikes to the structure per year P= Ac x Ng x 10 -6 Isokeronic Level=73 Annual thunderstorm daysLightning flash density (Clause 8.1.2 and fig1 IS: 2309Ng=6.9Lightning flashes / sqkm / year P=0.038735927Lightning flashes / year =0.000010Use of Structure A=1Table 1, 1AType of ConstructionB=1Table 1, BConsequential EffectsC=1Table 1, 1CDegree of IsolationD=1Table 1, 1DType of CountryE=0.3Table 1, 1E=A x B x C x D x E=0.3=P x A x B x C x D x E=1.162E-02 Protection Needed =20mFigure 5=10mFigure 5=2m=3m=25X6 GI StripTable 4=1008m=5Nos=128m=5Nos=5Nos=25x6 GI StripTable 4Overall Risk Factor Size of Horizontal Conductor   Number of Down conductor is considered to be following : (as per cl:12.2.3 of IS 2309) i)one plus an additional one for each 300 sq.mm ;or part thereof,in excess of the first 100 sq.mm. ii)one for each 30m of perimeter of the structures protected. No of Down Conductors Result: - Overall weightage Acceptable Risk (P o ) Collection Area  Ac Weighting Factors ELEVATIONPLAN28.00         3        6  .        0        0 No of Down ConductorsNo of down conductors to be considered (minimum of the above two)Size of Down Conductor Max spacing between conductors width wiseMax spacing between conductors depth wiseMinimum no of Conductors width wise including periphery conductorsMinimum no of Conductors depth wise including periphery conductorsBase AreaPerimeter    LIGHTNING CALCULATION FOR COOLING TOWERWidth of BuildingL=40mDepth of buildingW=15mHeight of buildingH=12m         1        2  .        0        0 =(L X W) + 2 x (L x H) + 2 x (W+H) + pH 2 sqm=2372.39sqmProbable Number of strikes to the structure per year P= Ac x Ng x 10 -6 Isokeronic Level=73 Annual thunderstorm daysLightning flash density (Clause 8.1.2 and fig1 IS: 2309Ng=6.9Lightning flashes / sqkm / year P=0.016369486Lightning flashes / year =0.000010Use of Structure A=1Table 1, 1AType of ConstructionB=1Table 1, BConsequential EffectsC=1Table 1, 1CDegree of IsolationD=1Table 1, 1DType of CountryE=0.3Table 1, 1E=A x B x C x D x E=0.3=P x A x B x C x D x E=4.911E-03 Protection Needed =20mFigure 5=10mFigure 5=2m=2m=25X6 GI StripTable 4=600m=3Nos=110m=4Nos=3Nos=25x6 GI StripTable 4Overall Risk Factor Size of Horizontal Conductor   Number of Down conductor is considered to be following : (as per cl:12.2.3 of IS 2309) i)one plus an additional one for each 300 sq.mm ;or part thereof,in excess of the first 100 sq.mm. ii)one for each 30m of perimeter of the structures protected. No of Down Conductors Result: - Overall weightage Acceptable Risk (P o ) Collection Area  Ac Weighting Factors ELEVATIONPLAN15.00         4        0  .        0        0 No of Down ConductorsNo of down conductors to be considered (minimum of the above two)Size of Down Conductor Max spacing between conductors width wiseMax spacing between conductors depth wiseMinimum no of Conductors width wise including periphery conductorsMinimum no of Conductors depth wise including periphery conductorsBase AreaPerimeter    LIGHTNING CALCULATION FOR BOILER Width of BuildingL=33mDepth of buildingW=20mHeight of buildingH=50m         5        0  .        0        0 =(L X W) + 2 x (L x H) + 2 x (W+H) + pH 2 sqm=13813.98sqmProbable Number of strikes to the structure per year P= Ac x Ng x 10 -6 Isokeronic Level=73 Annual thunderstorm daysLightning flash density (Clause 8.1.2 and fig1 IS: 2309Ng=6.9Lightning flashes / sqkm / year P=0.095316473Lightning flashes / year =0.000010Use of Structure A=1Table 1, 1AType of ConstructionB=0.2Table 1, BConsequential EffectsC=1Table 1, 1CDegree of IsolationD=1Table 1, 1DType of CountryE=0.3Table 1, 1E=A x B x C x D x E=0.06=P x A x B x C x D x E=5.719E-03 Protection Needed =20mFigure 5=10mFigure 5=2m=2m=25X6 GI StripTable 4=660m=4Nos=106m=4Nos=4Nos=25x6 GI StripTable 4No of Down ConductorsNo of down conductors to be considered (minimum of the above two)Size of Down Conductor ELEVATIONPLAN20.00Max spacing between conductors width wiseMax spacing between conductors depth wiseMinimum no of Conductors width wise including periphery conductorsMinimum no of Conductors depth wise including periphery conductorsBase AreaPerimeter Size of Horizontal Conductor   Number of Down conductor is considered to be following : (as per cl:12.2.3 of IS 2309) i)one plus an additional one for each 300 sq.mm ;or part thereof,in excess of the first 100 sq.mm. ii)one for each 30m of perimeter of the structures protected. No of Down Conductors         3        3  .        0        0 Result: - Overall weightage Acceptable Risk (P o ) Collection Area  Ac Weighting Factors Overall Risk Factor 

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