浮顶油罐的设计计算书

伊拉克油罐计算书（中文）罐体参数：直径d=76.25m高h=12.8m其中一道抗封圈，三道加强圈。具体尺寸见附图。二、油罐总用水量Q=πdh10.2L/min=3.14x76.25x12.8x10.2=31259.328L/min因为采取四根立管，所以取四分之一，q=31259.328/4=7814.832L/min三、喷头数的初步确定根据喷水角度相切的原理，计算尺寸见下图：由正弦定理得：=X=1.325°则每圈喷头个数n==135.8，应为136个整个圆周分成四部分，只计算其中四分之一即可，喷头个数为34个，如下图：四、喷头的流量，压力计算1、第一区：高1.1m面积S5/4=65.84m2此区域需流量Q=Sx10.2L/minm2=65.84x10.2=671.57L/min=11.2L/s每个喷头的流量为q=671.57/34=19.8L/min，间距1.76m。据此选水幕喷头SMTBD-22-120，主要参数如下：特性系数K=11.81.1Q=222L/min雾化角=12010°接管螺纹1/2“由公式q=Kq——喷头流量（L/min）P——喷头工作压力（MPa）K——喷头流量系数上图节点1到18进行水力计算，如表一。表一顶环编号流量L/min压力MPa管径mm长度m水力损失编号流量L/min压力MPa管径mm长度m水力损失1220.3510235.30.4411-2201.760.004501.760.003244.220.35411260.20.4442-3201.760.015501.760.004366.950.36912285.30.4483-4251.760.01501.760.004490.00.379310.50.4524-5251.760.018501.760.0055113.60.397335.80.4575-6321.760.006501.760.0066137.40.403361.30.4636-7321.760.009501.760.0077161.40.412386.90.4707-8321.760.012501.760.0088185.80.424412.80.4788-9401.760.007500.880.0049210.40.431825.60.482401.760.01825.60.48229.040.132总的损失=1.2x沿程损失=1.15x0.132=0.15182、第二区：高2.0m5/4=119.65m2此区域需流量Q=Sx10.2L/minm2=119.65x10.2=1220.27L/min=20.34L/s每个喷头的流量为q=1220.27/34=35.9L/min，间距1.76m。据此选水幕喷头SMTBD-40-120，主要参数如下：特性系数K=21.41.6Q=403L/min雾化角=12010°接管螺纹3/4“由公式q=Kq——喷头流量（L/min）P——喷头工作压力（MPa）K——喷头流量系数上图节点1到18进行水力计算，如表二。表二二环编号流量L/min压力MPa管径mm长度m水力损失编号流量L/min压力MPa管径mm长度m水力损失1400.3510422.30.4491-2251.760.004701.760.003280.260.35411467.80.4522-3251.760.014701.760.0033121.30.36812513.450.4553-4251.760.031701.760.0044164.050.399559.30.4594-5321.760.013701.760.0055207.490.412605.40.4645-6321.760.02701.760.0056247.800.432651.740.4696-7501.760.004701.760.0067290.380.436698.40.4757-8501.760.005701.760.0078333.500.441745.20.4828-9501.760.006700.880.0049376.940.4471490.40.486701.760.0021490.40.48629.040.136总的损失=1.2x沿程损失=1.2x0.136=0.16323、第三区与第二区基本相同，只进行流量与压力的校核。见表三表三三环编号流量L/min压力MPa管径mm长度m水力损失编号流量L/min压力MPa管径mm长度m水力损失1400.3510420.80.4551-2251.760.004501.760.01280.260.35411466.90.4652-3251.760.014701.760.0033121.30.36812513.20.4683-4251.760.031701.760.0044164.050.399560.50.4724-5321.760.013701.760.0055207.490.412607.70.4775-6321.760.02701.760.0056247.800.432655.10.4826-7501.760.004701.760.0067290.380.436702.80.4887-8501.760.005701.760.0078333.500.441750.80.4958-9501.760.006700.880.0049376.940.4471501.60.499501.760.0081501.60.49929.040.14949=0.17884、第四区：高7.7m461.0m2此区域需流量Q=Sx10.2L/minm2=461x10.2=4701.1L/min=78.35L/s由于流量比较大，所以喷头相应增加为48个。每个喷头的流量为q=4701.1/48=98.0L/min，间距1.25m。据此选水幕喷头SMTBD-100-120，主要参数如下：特性系数K=53.53.2Q=1005L/min雾化角=12010°接管螺纹3/4“由公式q=Kq——喷头流量（L/min）P——喷头工作压力（MPa）K——喷头流量系数下图节点1到25进行水力计算，如表四。表四四环编号流量L/min压力MPa管径mm长度m水力损失编号流量L/min压力MPa管径mm长度m水力损失11000.35131372.20.4281-2321.250.003801.250.0082200.50.353141484.00.4362-3321.250.0131001.250.0023302.850.366151596.00.4383-4501.250.0041001.250.0034405.760.3701708.40.4414-5501.250.0071001.250.0035509.640.3771821.10.4445-6501.250.011001.250.0036614.880.3871934.20.4476-7701.250.0031001.250.0047720.530.3902047.80.4517-8701.250.0061001.250.0048827.00.3962162.00.4558-9701.250.0071001.250.0049934.40.4032276.60.459701.250.0081001.250.0051042.70.4102391.80.464801.250.0051001.250.0061151.70.4152507.80.470801.250.0061001.250.0061261.50.4212624.50.476801.250.0071000.630.0035249.00.4795249.00.47929.380.129总的损失=1.3x沿程损失=1.3x0.129=0.1677由表一~表四得：四分之一油罐所需总流量Q=(5249+1501.6+1490.4+825.6)x1.15=10426.6L/min=173.78L/s则L=12.8m,选DN250钢管，水力损失=0.013MPa流速v=3.48m/s四分之一油罐所需总水压P=0.35+0.1518+0.128+0.013=0.643MPa五、立管尺寸的确定根据以上数据，第一环至二环段流量q=825.6L/min=13.76l/s管径为DN80流速v=2.77l/s第二环至四环段流量q=3817.6L/min=63.63l/s管径为DN150流速v=3.75l/s四环以下流量q=9066.6L/min=151.1l/s管径为DN250流速v=3.10l/s以上为冷却水喷淋计算。油罐泡沫消防部分计算：根据NFPA11罐壁到泡沫挡板距离d=600mm泡沫液供给强度12.2L/minm2供给时间20min二、大罐密封圈环型面积s=罐顶总表面积-不需要保护的面积=R2-r2=（R2-r2）=3.14x(38.132-37.632)=118.94m2所需总炮沫量=s泡沫供给强度=118.94x12.2=1451.1L/min=24.2l/s泡沫浓缩液的量（6%）=1451.1x20x6%=1741.32L三、根据油罐的圆周确定泡沫喷射口的设置数量1泡沫挡板使用高305mm时，泡沫喷射口在油罐圆周上的最大间距为12.2m；2泡沫挡板使用高610mm时，泡沫喷射口在油罐圆周上的最大间距为24.4m；本次设计挡板高于610mm，所以间距宜取24.4m油罐圆周长度=d=3.14x76.25=239.425m喷射口数量=239.425/24.4=9.8125取为10个泡沫系统简图，如下所示：四、管道水力计算一流量：每个喷射口所需要泡沫量=所需总泡沫量/10=24.2/10=2.42l/s二压力：空气泡沫产生器选PC4，选用DN50的焊接钢管，具体参数如下：进口压力0.5MPa混合液流量4L/s发泡倍数>=6特性系数K=5.75流速v=1.88m/s沿程水头损失=0.001772MPa（m）局部水头损失=0.000532MPa（m）总水头损失=0.002304MPa（m）管长L=14m，则总管线的水头损失=14x0.002304=0.0322MPa得H=h+h0+hz=0.0322+0.5+0.13=0.6622MPaH——油罐底部管线进口压力（MPa）h——系统管道的沿程压力损失与局部压力损失之和（MPa）h0——最不利点处泡沫产生器装置的工作压力（MPa）hz——最不利点处泡沫产生装置与管道进口的静压差（MPa）CALCULATIONSHEETOFONEOILTANK（英文）Coolingwatersystem1、TankParameter：Diameter=76.25mHigh=12.8m2、WaterquantityQ=πdh10.2L/min=3.14x76.25x12.8x10.2=31259.328L/minTotalfourstandpipe,eachstandpipe=31259.328/4=7814.832L/min3、Nozzlequantity=X=1.325°Nozzlequantityofeachring==135.8，应为136个4、NozzleFluxandpressure1)Firstarea：H=1.1m65.84m2Q=Sx10.2L/minm2=65.84x10.2=671.57L/min=11.2L/sFluxofeachnozzle=671.57/34=19.8L/min.Checkoutbycomputer:Quantityofnozzle172shouldbeinsteadof136.Spacebetween:1.39m。Lostpressure=1.15x0.132=0.1518Thenominaldiameterofringpipe1is50mminaccordingtoflux、velocityofflow.Secondareaandthirdarea：H=2.0m119.65m2Q=Sx10.2L/minm2=119.65x10.2=1220.27L/min=20.34L/sFluxofeachnozzle=1220.27/34=35.9L/minCheckoutbycomputer:Quantityofnozzleare136.Spacebetween:1.76m。Lostpressure=1.2x0.136=0.1632Thenominaldiameterofringpipe2and3is65mminaccordingtoflux、velocityofflow.3)fourtharea:H=7.7m461.0m2Q=Sx10.2L/minm2=461x10.2=4701.1L/min=78.35L/sFluxofeachnozzle=4701.1/48=97.9L/minCheckoutbycomputer:Quantityofnozzle192shouldbeinsteadof136.Spacebetween:1.25m。Lostpressure=1.3x0.129=0.1677Thenominaldiameterofringpipe4is100mminaccordingtoflux、velocityofflow.4)FluxofOnefourthoiltank=(5249+1501.6+1490.4+825.6)x1.15=10426.6L/min=173.78L/sThenominaldiameterofstandpipeis250mminaccordingtoflux、velocityofflow.Lostpressure=0.013MPaFoamsystem1、AccordingtoNFPA11Thedistancefromtankshelltofoamdam:600mmFoamapplicationrate:12.2L/minm2Foamdischargetime:20minutesProportioningrate: