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发表于 2013-7-3 09:32:46
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1.程序自动反算MAWP时,考虑开孔补强不?这个问题也是好多初学者疑惑的地方,很复杂。需要视频讲解。
是会考虑的,要求设计者熟练的理解透标准和熟练的运用软件,会看计算书,并加以调整,不要既希望软件什么多能做,他不过是个工具,也是人编的,除非编程人员懂机械标准,理解透ASME规范,这好像不可能。
见计算书:我拷贝了一个实例,见下面的警告部分,这就是步枪限制了设备的MAWP。
Nozzle Calculation Summary:
Description MAWP Ext MAPNC UG45 [tr] Weld Areas or
MPa MPa Path Stresses
---------------------------------------------------------------------------
Noz N1 Fr20 0.5272 ... ... OK 6.80 OK Passed
---------------------------------------------------------------------------
Min. - Nozzles 0.5272 Noz N1 Fr2
Min. Shell&Flgs 1.1820 20 30 1.651
Computed Vessel M.A.W.P. 0.527 MPa
Note: MAWPs (Internal Case) shown above are at the High Point.
〈〈〈〈〈〈 Warning: A Nozzle Reinforcement is governing the MAWP of this Vessel。 〉〉〉〉〉〉
Check the Spatial Relationship between the Nozzles
From Node Nozzle Description X Coordinate, Layout Angle, Dia. Limit
20 Noz N1 Fr20 1050.800 0.000 1231.900
The nozzle spacing is computed by the following:
= Sqrt( ll^(2) + lc^(2) ) where
ll - Arc length along the inside vessel surface in the long. direction.
lc - Arc length along the inside vessel surface in the circ. direction
If any interferences/violations are found, they will be noted below.
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