封头球面半径R1=960mm 封头材料的选用 16mnR
封头材料在设计温度下的许用应力????159MPa
t ??0.85
??5PtRi5?3.71?960??22mm t6????6?159?0.85?d???2C2?22?2?2?26mm
?n??d?2C1???26?0???26mm
?e??n?C1?C2?26?0?2?24mm
水压试验校核 内压作用 pT?1.25P????1.25?3.71?151.8?4.43MPa
159???t ?t?pT(1.15Di??e)4.43?(1.15?1200?24) ?2?e2?24 =129.6mpa
0.9??s?0.9?0.85?325?248.6mp a ?t?0.9??s 符合要求 外压作用 pT?1.25P????1.25?3.71?151.8?4.43MPa t159???
?t?pT(1.15Di??e)4.43?(1.15?1200?24)??129.6MPa
2?e2?240.9??s?263.4MPa
?t?0.9??s 符合要求
b)浮头法兰计算厚度
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pc?3.71MPa t=230℃
法兰外直径 Dfo=1240mm 螺栓中心圆外径 Db=1230mm 法兰内直径 Dfi=1160mm 螺栓材料 40CR 垫片材料 Ocr19Ni9 垫片系数 m=3.5 比压力 y=44.5 螺栓直径 dB=30mm 螺栓数量 n=52个 浮头垫片的基本参数，可得 外径 D=1192mm 内径 d=1160
D?d1192?1160??16mm 22N16?8mm b0??22垫片宽度 bn? b0?6.4mm
b?2.53b0?2.538?7.16mm
DG?Di?2b?1200?2?7.16?1185.68mm
Fp?6.28DGbmpc=6.28?1185.68?3.5?3.71?692280.5N F=0.785DGP?0.785?1185.682?3.71?4094289N
2Wa?3.14DGyb?3.14?1185.68?44.8?7.16?1193545.6N
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F+FP=4786570N
Am?F?FP???tbWa?4786570?26592mm2 180Am2????b?1193545.6?5630mm
212Am?Am1或Am1中较大值
Am?Am1?26592mm2 螺栓根径 dmm?26.3mm
Pb?n?4d2?52??4?26.3?28235N
W=0.5Am?Ab???b?0.5(26592?28325)?212?5821202N
封头边缘处的球壳中面切线与法兰环的夹角
?1?arcsin0.5Di0.5?1160?arcsin?36°
Ri?0.5?n960?0.5?26在操作情况下法兰的受力
FD0.785DfiPc?0.785?11602?3.71?3918858N FG?FP?692280.5N
FT?F?FD?4094289?3918858?175431N Fr?FDcot??3918858?cot36°=5393845N
力臂 Ld?0.5(Db?Dfi)?0.5(1230?1160)?35mm
2LG?0.5(Db?DG)?0.5(1230?1185.68)?22.16mm LT?0.5(LD?LG)?0.5(35?22.16)?28.58mm
设法兰厚度 ?t=164mm l=36mm Lr=
?t2??n2cos?1?l
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=
16426??2?64mm 22?cos36o力矩 MD?FDLD?3918858?35?137160030N MG?FGLG?692280.5?22.16?15340935.8N MT?FTLT?175431?28.58?5013817.98N MR?FRLR?5393845?64?345206080N 操作情况下法兰总力矩
MP?MD?MG?MT?MR??187691296.2N 预紧螺栓时法兰的受力
FG?W?5821202N 11力臂 LG?(DB?DG)?(1230?1185.68)?22.16MM
22力矩 MG?FG?LG?582120?22.16?128997836.3N 法兰材料为锻件 16mn ???t?150mpa ???f?135mpa
t L?PcDfi4Ri?Dfit228???f(Dfo?Dfi)
3.71?11604?9602?11602? 8?135?(1240?1160)?76mmDfo?DfiMP操作状态 Jp?t()
???fDfiDfo?Dfi?187691296.21240?1160() 135?11601240?1160
??35956mm2?Dfo?DfiMa预紧状态 Ja?()
???fDfiDfo?Dfi 38
128997836.31240?1160() 150?11601240?1160
?22241mm2?操作状态下的法兰厚度 dfp?L?JP?L2
2?76?35956?76 ?280mm预紧状态下的法兰厚度 dfa?Ja?22241?149mm
2.7.2 壳程压力PS作用下浮头盖的计算
球冠形封头的计算厚度 假设?n=30mm
?e??n?C2?C1?30?2?0?28mm
RO?e?970?34.64 28 A?0.1250.125??0.0036 RO34.64?e B=158 ?P?BRO??e158?4.56MPa?3.71MPa 合理 34.64 ?P??Pc ?1?arcsin =arcsin0.5DfiRi?0.5?n
0.5?1160?36°
960?0.5?30 Fr?FDcos?1?3918858?cos36°=539384513N
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