Mr.Jose,
Reply to your questions are as follows,
1.Peaking & banding is nothing but the profile of the tank i.e while erecting the shell plates the curvature to be maintained.
The shell plates rolled to a radius to be maintained till the welding of joints completed.For this purpose only the curavture of joints are checked.
For vertical joints of tank curvature is called as Peaking.
For Horizontal joints it is called a Banding.Banding is also called a straightness.
2.These can be measured by making a template of 1 mtrs length.Template shall be of a wooden board .Mark the radius of the tank shell in an wooden board and cut accordingly.One side of the template shall be used for peaking and the other side straight side shall be used for banding.There is no specific requirement for making a template just make for easy handling
3.Keep the template-straight side on the centre of horizontal joints so now you will find half(500mm)on one shell course and remaining half on the other shell course.Take the measuring scale and measure the gap between joints.
Keep the template-radius side on the centre of vertical joints and measure the peaking so now you will find half(500mm)on one shell course and remaining half on the other shell course.Take the measuring scale and measure the gap between joints.
4.Peaking & banding are the important parameters to be checked while constructing a tank because circularity & verticality is checked but at the same time on the tank weld joints Peaking & banding are checked to maintain the profile and to avoid local buckling of weld joints.
4.Peaking & banding are the important parameters to be checked while constructing a tank because circularity & verticality is checked but at the same time on the tank weld joints Peaking & banding are checked to maintain the profile and to avoid local buckling of weld joints.
Regards,
R.Kamalanathan,
Manager-Quality Control,
LANCO INFRATECH LIMITED,
VIZAG,INDIA
On Mon, May 31, 2010 at 6:40 PM, jose seban <joseseban@gmail.com> wrote:
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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