As per ur question no :1 in vessel fab. Or tank the long seam assembly
you must check the peak in or peak out then only find the seam fit up
came inside or gone out side before welding and at that time of weld
visual. Simple you can make D/2 or D/4 template fixed inside gap find
in middle of temp. That is peak out that is directly take and if u
find out one side fix one side and measure other end and divided by 2
u will get peak in.
Point no :2circular seam fit up you can fix top ,seam and bottom area
you can check the circularity as well as check the verticality as per
the code u r given divided the circle by 8 deg. And drop the plumb at
1m above the seam or top of the tank as u wish.
I think it will help lot..sure.
Sethuramalingam.P
Acpcpl
On 5/31/10, raghurambathula@gmail.com <raghurambathula@gmail.com> wrote:
> You can make a template from a steel sheet / scrap plate with radius of
> template equal to your tank radious with an arc length of aprx 1 mtr. place
> this on your tank and if you are getting greater than 12mm gap, needs
> rectification. Similar way use 1 mtr steel rule as straight edge to check
> verticality.
>
> Your 4th point itself is an answer to your query. How do you intended to
> check verticality and circularity?
>
>
> Sent from my Nokia phone
> -----Original Message-----
> From: jose seban
> Sent: 31/05/2010 6:40:27 pm
> Subject: [MW:5320] Peaking & Bending Measurement of Welded Joints in
> Cylindrical Storage Tanks....
>
> Dear Friends,
>
> I am making fixed roof cylindrical oil storage tanks as per Indian
> Standards IS-803.In section 9.3.5 it is mentioned about circularity
> and shape.There it is mentioned about verticality & circularity
> tolerences.Also it is mentioned about peaking and bending of welds
> there..
>
> 1.Peaking of vertical weld joints measured over an arc length of 1 m
> shall not exceed 12 mmm.
>
> 2.Bending of horizontal weld joints measured by a straightedge of 1 m
> length shall not exceed 12 mm.
>
> My questions are..
>
> 1.What is meant by this peaking and bending there?
> 2.How we will measure these factors?
> 3.How would the unit "millimetre" will come for these factors
> measurement?
> 4.Is these 2 measurements are important in tank fabrication,if I am
> checking vericality & circularity properly?
>
>
> Regards,
>
> Jose Sebastian,
> Quality Manager,
> Adani Power Limited,
> Gujrat,India.
> Mob:+919687660525
>
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--
Sent from my mobile device
Regards
Sethu Ramalingam.p
--
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