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Weldolets On Vessel

01/30/2013 4:41 AM

Hi All,

I would like to ask about welding weldolets on pressure vessel.

Pressure vessel will be designed according ASME Sect. VIII Div. 1 but there will be no stamp.

Shell thk. is 18mm and nozzle sizes are 3/4", 1" and 1-1/2" with sch. 160.

Most nozzles are on the top of shell but there are some hillside nozzles too.

How should I arrange the welding configuration?

Thanks

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Guru
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#1

Re: weldolets on vessel

01/30/2013 4:52 AM

The arrangement of nozzles has to compatible with both the P&ID and with the piping isometric drawings as there may well be space and structural constraints to be considered. It is an iterative process, whereby the design is reviewed and changed by others until a "for construction" approved drawing is available. Once this is to hand, build it like that.

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#2
In reply to #1

Re: weldolets on vessel

01/30/2013 7:57 AM

Thanks for reply and it is useful for me.

But what I really need is welding details for wedolet to vessel shell, not nozzle arrangement.

I think my question was unclear.

I need something like below but there will be weldolet between pipe and shell (no re-pad).

Also need to get detials for hillside nozzle attachment too.

Please answer again when you have time.

Many thanks.

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Guru

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#3
In reply to #2

Re: weldolets on vessel

01/30/2013 11:06 AM

Page 35 of this document http://www.bonneyforge.com/resources/BC.pdf has the installation procedure.

If this is to be installed in the US, are you sure OSHA and your insurance carrier will allow an unstamped pressure vessel?

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#4
In reply to #3

Re: weldolets on vessel

01/30/2013 7:35 PM

Thanks for reply, bigg. This vessel is not in US.

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Guru
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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#5
In reply to #4

Re: weldolets on vessel

01/31/2013 3:48 AM

Then it needs to conform to the codes applicable in the country of installation.

It is time to discuss this matter in detail with the Engineer/Surveyor for the company that will be supplying burst indemnity insurance cover on the vessel once it has been installed. They will need to see a drawing of the intended arrangements and it would be wise to get a return copy from them marked "no comments" prior to manufacture of the vessel. The document needs to fit in the general design review matrix indicated in #1↑, which should be embraced by the approved procedures of the company designing and constructing the vessel; if not, then don't expect the operation to stay in business very long.

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