PEAKING & BANDING

1. Peaking & bandingis nothing but the profile of the tank i.e. while erecting the shell plates the curvature tobe maintained.The shell plates rolled to a radius to be maintained till the welding of joints completed. For this purpose only the curvature 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 straightness.2. These can be measured by making a template of 1 mtr length. Template shall be of a wooden board .Mark the radius of the tank shell in a 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 handling3. Keep the template-straight sideon 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 checkedbut at the same timeon the tank weld joints Peaking & banding are checked to maintain the profile and to avoid local buckling of weld joints.