vertical vessel piping _first rest support

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Chiranjeevi A

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Jul 17, 2019, 3:37:57 AM7/17/19
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Dear all,

  Please find the below, sulfur absorber vessel, The following pipe mtl is A335 P11 and thk. = 14.27mm. The vertical portion is 3.8m only, immediately on the rack we have rest support

   If the vertical portion is long i.e if it about 15m and above, we have to provide rest support either rigid or spring in vertical portion.

As per below snap small vertical vessel and the pipe size 12" sch 60 we have more span. Providing support and if not in the vertical portion doesnt impacting the nozzle loads. The nozzle loads are Fx=Fy=Fz=18Tons and Mx=15tons, My=Mz=7tons. In my point of view first rest support is not required in this case, kinldy share your opinions 

image.png


Chiranjeevi A

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Jul 17, 2019, 12:24:06 PM7/17/19
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Hemant W Joshi

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Jul 17, 2019, 12:24:06 PM7/17/19
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Do not know if your vertical support consisting of lugs is practically possible without incurring extra supporting costs.

The nozzle loads appear to be quite high.

Morever it is not clear how much is the overall pipe length in the horizontal direction for locating the rest support.  The vertical length of 3.8m has a dead load (empty) of 500 kg. overall considering even the horizontal length dead load . the load does not appear too much .

Hence the rest support looks okay unless it is located beyond the permissible span.

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George Dilintas

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Jul 17, 2019, 12:24:09 PM7/17/19
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did you run flexibility calculations? If you get zero reactions at this support for all loading conditions including pressure test, then you may remove it

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Chiranjeevi A

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Jul 17, 2019, 11:04:06 PM7/17/19
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Dear Hemant,

   The horizontal spool length is just 2m and vertical = 3.8m. Hence deleted the support because we have immediate rest support on rack structure. 
  

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Chiranjeevi A

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Jul 17, 2019, 11:04:14 PM7/17/19
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Dear Georgios,

   We run the flexibility analysis check, since it a small vertical vessel will “Grow” up due to the thermal expansion created by the process temperature & the pipe will grow down thus equalizing some of the vessel vertical “ growth”. 

   If the vertical columns of length about 15m and above we have to give rigid support near to nozzle. In this case, we verified all the required parameters in flexibility analysis and deleted support.



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Hemant W Joshi

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Jul 18, 2019, 1:28:17 AM7/18/19
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To shri Chiranjeevi A

Yes I meant that the rest support on the pipe rack may be kept.


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Chiranjeevi A

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Jul 18, 2019, 1:28:17 AM7/18/19
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Dear all

Chiranjeevi A

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Jul 18, 2019, 11:28:39 PM7/18/19
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Thank you hemant, I kept the support on pipe rack, deleted the support in vertical. 

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