UG-45接管颈部最小厚度要求的理解

emperor620

在UG-45中规定了接管颈部的最小厚度
t a = minimum neck thickness required for internal and external pressure using UG-27 and UG-28 (plus corrosion allowance), as applicable. The effects of external forces and moments from
supplemental loads (see UG-22) shall be considered.Shear stresses caused by UG-22 loadings shall not exceed 70% of the allowable tensile
stress for the nozzle material.
tb1 = for vessels under internal pressure, the thickness (plus corrosion allowance) required for pressure (assuming E = 1.0) for the shell or
head at the location where the nozzle neck or other connection attaches to the vessel but in no case less than the minimum thickness specified
for the material in UG-16(b).
tb2 = for vessels under external pressure, the thickness (plus corrosion allowance) obtained by using the external design pressure as an equivalent internal design pressure (assuming E = 1.0)
in the formula for the shell or head at the location where the nozzle neck or other connection attaches to the vessel but in no case less than
the minimum thickness specified for the material in UG-16(b).
tb3 = the thickness given in Table UG-45 plus the
thickness added for corrosion allowance.
tUG-45 = minimum wall thickness of nozzle necks

对于ta还算好理解，相当于将接管作于筒体计算，得到的厚度
但tb1和tb2中的required for pressure for the shell or head at the location where the nozzle neck or other connection attaches to the vessel。这句话就不太好理解了，中石协也翻译的不太好
筒体或封头在接管颈部位置时所要求的厚度？不知大家如何理解？另外在计算时，是否会考虑核算接管颈部壁厚？在pvelite中是如何输入？

另外在国标中好像没有看到相应的要求？

lorvoo

国标没这个要求。
对于筒体封头在接管处的计算厚度，就是按筒体封头公式计算的厚度。

20902002

感谢楼主分享！

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C-15卡布其诺

楼上可能是刚接触ASME规范吧，UG-45接管壁厚计算其实很简单，按照规范一步步往下算，最后取ta和 tb的较大值，就是接管的计算壁厚
PV Elite软件接管计算，有个熟悉的人稍微给你说一下，就明白了

我在听

http://www.asimi8.com/forum.php? ... 2&fromuid=10308
上面的一篇帖子，里面讲的挺清楚的，Nozzle Thickness那个标签

(ˇˇ）_想

对于筒体封头在接管处的计算厚度，就是按筒体封头公式计算的厚度。

emperor620

lorvoo 发表于 2014-1-22 21:47
国标没这个要求。
对于筒体封头在接管处的计算厚度，就是按筒体封头公式计算的厚度。

那与ta的有什么区别呢，ta也是作为筒体计算