Re: [MW:14911] Maximum Spin Hole Diameter for Dish End

Dear Nitin,

To me it appears that the design of the dish end assumes a certain geometric profile, say 2:1 ellipsoidal. Probably the code recognises that:

 

(i) to facilitate manufacturing the DE, the hole is necessary.

(ii) the hole will be closed with a plate.

(iii) It is difficult to shape a small plate to the profile, yet if it is a large flat plate, the design at that location would differ.

So as a trade-off the value of 60 mm has been arrived for which the effect on design is minimal. Any thing more than that has to be considered in the design.

 

If it is not a coded vessel, you may have the design checked with 70 mm and proceed with client concurrence.

-BM-

On Thursday, July 19, 2012 6:51:51 PM UTC+5:30, Nitin Shetty wrote:

Sir
On what basis is it not acceptable

Regards

Nitin

Sent from Nitin Shetty iPhone

On Jul 18, 2012, at 6:01 AM, Swapnil Vanjara <swapnil.vanjara@gmail.com> wrote:

> not acceptable
>
>
> On 7/14/12, sevak hiren <hirensevak80@gmail.com> wrote:
>> At the time of forming the spin hole dia was less than 60 mm around 30 mm,
>> but while forming the crack was observed at spin hole, so the hole was
>> extended to 70 mm & the patch was welded. RT is also done for patch weld.
>>
>> But as per Section VIII Div I, is it acceptable ?
>>
>> On Fri, Jul 13, 2012 at 5:01 PM, Swapnil Vanjara
>> <swapnil.vanjara@gmail.com>wrote:
>>
>>> first of all tell me haw ur dia bcm more than 60
>>>
>>>
>>> On 7/13/12, Swapnil Vanjara <swapnil.vanjara@gmail.com> wrote:
>>>> first of all tell me haw ur dia bcm more than 60
>>>>
>>>>
>>>> On 7/13/12, sevak hiren <hirensevak80@gmail.com> wrote:
>>>>> Dear Experts,
>>>>>
>>>>> As per ASME section VIII Div I , UW-34, max. allowable patch diameter
>>> for
>>>>> a
>>>>> spin hole of dishend is 60 mm.
>>>>>
>>>>> If, the dish end spin hole patch diameter is found to be of more than
>>>>> 60
>>>>> mm
>>>>> then the dish end should be rejected, please correct me if I am wrong.
>>>>>
>>>>>
>>>>> Thanks in advance.................
>>>>>
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>
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